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Old 09-25-2009, 07:24 PM   #26
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Quote:
Originally Posted by radz282003 View Post
Hey - Joe!

You want to take the pics' from the Z28 Sticky and stick in here? There are a bunch that I didn't even post that I left a link for there too. I can do it if you like If you want to, I'll revise my thread and remove them so there's no redundancy.

I read that whole article now, and there's some stuff I don't recall before. Good info' right there.
Of course, can you PM me a link to the images, please?

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dont know if you want to add this attachment to your original post
Sure will!! I didn't add it originally, because most of that info was in the writeup, but there's some things in there that wasn't mentioned.

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Originally Posted by radz282003 View Post
Hypereutectics are better now, I believe. They still aren't as good as forged slugs in the LS9, but they're better than the past.
As far as stock engines go...this thing is freaking Bulletproof. It outlived an LS9 with all it's titanium and forged whatsits by ~170 continuous hours of WOT testing. Personally, I don't ever plan to change the engine...maybe Headers, intake and a MILD tune to bump it to 600hp...and only so I can say "I have 600 hp", .

BUT, if you're into heavy modifications, then of course you have a greater concern. And so, if the LSA has a weakness for these people, it's going to be the pistons. If anybody out there with expertise in the field can comment, it would be greatly appreciated!!
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Old 09-25-2009, 08:03 PM   #27
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All correct except for the fact that there is a base Vette that start's at $48,000 wich would fall in that category and then the fact that the track time's of them would be close, real close.
Since Chevy will start building the C7 vette in 2012, I highly doubt it will have a base price of 48k. JMHO.
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Old 09-25-2009, 08:05 PM   #28
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Seeing "what might be expected" in the Z28 is making me think twice about ordering the SS. I just wonder what the price tag will end up being after its' all said and done.
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Old 09-25-2009, 08:09 PM   #29
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Seeing "what might be expected" in the Z28 is making me think twice about ordering the SS. I just wonder what the price tag will end up being after its' all said and done.
I am expecting a base price of 50k, but it does not matter when one considers dealer markups the z28 will most likely have up to 60k! I hope I am wrong.
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Old 09-25-2009, 08:10 PM   #30
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I wonder what Chrysler/Fiat is going to do to the 6.4 Hemi
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Old 09-25-2009, 08:13 PM   #31
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I wonder what Chrysler/Fiat is going to do to the 6.4 Hemi
I don't want too get off topic, but by my understanding that was just a rumor.
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Old 09-25-2009, 08:20 PM   #32
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I don't want too get off topic, but by my understanding that was just a rumor.
It's not ... there have been confirmed reports that its still in development, and there's going to be plum crazy next year too
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Old 09-25-2009, 08:31 PM   #33
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I am expecting a base price of 50k, but it does not matter when one considers dealer markups the z28 will most likely have up to 60k! I hope I am wrong.
I hope your wrong too!
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Old 09-25-2009, 10:20 PM   #34
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Since Chevy will start building the C7 vette in 2012, I highly doubt it will have a base price of 48k. JMHO.
Base 2009 Corvettes are going for $39k right now. This is lower than what they were going for in 2007.

Very, very few people are buying high end items right now, but the media is selling you another story.

I'll believe in a C7 only when I see it. 2 years is a lot of time for this company to lose billions more.
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Old 09-25-2009, 10:27 PM   #35
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WOW, okay i was alwaysin favor of the LS7 over the LSA in Z/28s but i think this thread just converted me haha, first of all "no whine" thaaank god! I cant STAND supercharger whine, it was one of my biggest urkes against this engine and its good to know its taken care of, also its tested as more durable than the LS9 (which is strange cause LS9 has all forged internals and LSA doesnt) but its still good to know the supercharger doesnt cause any lack of durability...i think im all for this engine now, aanndd may we see some horsepower improvements by the time the Z/28 hits dealerships? cam and heads, 600hp maybe? =D
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Old 09-25-2009, 10:35 PM   #36
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Base 2009 Corvettes are going for $39k right now. This is lower than what they were going for in 2007.

Very, very few people are buying high end items right now, but the media is selling you another story.

I'll believe in a C7 only when I see it. 2 years is a lot of time for this company to lose billions more.
That 39k is not MSRP, The MSRP of the C7 will be Higher than the C6. Also I have to correct your statement, very few people are buy cars right now period, both high-end and cheap cars are selling at half the rate they used to. That makes the market more competitive. By my understanding for an example BMW's M division has had one of there best sales year las year despite the low sales of the auto industry. Partially that is because people who have money will always buy niche cars. The people who are in the market to buy 2 seater high performance cars spend money on the cars they want (porsche knows this). The C7 will go up in MSRP and most likely offer more HP, Better interior and performance than the C6. We shall see.
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Old 09-25-2009, 10:48 PM   #37
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That 39k is not MSRP, The MSRP of the C7 will be Higher than the C6. Also I have to correct your statement, very few people are buy cars right now period, both high-end and cheap cars are selling at half the rate they used to. That makes the market more competitive. By my understanding for an example BMW's M division has had one of there best sales year las year despite the low sales of the auto industry. Partially that is because people who have money will always buy niche cars. The people who are in the market to buy 2 seater high performance cars spend money on the cars they want (porsche knows this). The C7 will go up in MSRP and most likely offer more HP, Better interior and performance than the C6. We shall see.
The Camaro is selling very well.
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Old 09-25-2009, 11:56 PM   #38
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Quote:
Originally Posted by Vega View Post
WOW, okay i was alwaysin favor of the LS7 over the LSA in Z/28s but i think this thread just converted me haha, first of all "no whine" thaaank god! I cant STAND supercharger whine, it was one of my biggest urkes against this engine and its good to know its taken care of, also its tested as more durable than the LS9 (which is strange cause LS9 has all forged internals and LSA doesnt) but its still good to know the supercharger doesnt cause any lack of durability...i think im all for this engine now, aanndd may we see some horsepower improvements by the time the Z/28 hits dealerships? cam and heads, 600hp maybe? =D
how can u not like the whine of a positive displacement supercharger. its just intoxicating. it rocks.

oh yeah first thing would be headers, catback, and whipple 2.9 or 3.4 swap
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Old 09-26-2009, 12:25 AM   #39
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I just dont get into it, i preffer the sound of a hearty V8 roar, hearing that V8 and then an underlying vaccuumish high pitched thing just bugs me =/

But actually i just did some digging and apparently the LS7 concept camaro at SEMA had a "slightly modified 586hp engine" so i was right, it is easy to pump beyond the LSA's capacity on all motor (of course one could make the argument that the LSA could easily be pumped beyond THAT but then it just becomes mud-slinging) i think after hearing this news im back in favor of a slightly modified LS7 powering the Camaro, people can say "its been announced, its phasing out" and all that but by now we hould know announcements mean nothing in the world of supply and demand haha, especially when it comes to Camaros...just my oppinion but i would LOVE to be able to say "yeah my Z/28's got the stock 427" and i'd LOVE to hear "427 Camaro re-takes the throne from supercharged shelby" those three numbers just have such a legendary aura around them, its quite amazing ^_^
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Old 09-26-2009, 08:36 AM   #40
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Originally Posted by radz282003 View Post
Hypereutectics are better now, I believe. They still aren't as good as forged slugs in the LS9, but they're better than the past.
Thats correct, with oil pistion squirters, and lower compression will help out those hyperutectic pistions as well. There are people out there with stock bottom end LS1/2 with 600-700hp at the crank with FI. Are they on barrowed time who knows but alot of them are still chugging along, a good tuner allways help too.



Dragoneye thanks for taking the time to post all that up. I found alot of that info on GM sites also if you want to post pictures of the LSA they can be found here: http://media.gm.com/us/powertrain/en...ual/09lsa.html
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Old 09-26-2009, 09:26 AM   #41
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Seriously?, 48K, that just pisses me off even more, here are the starting prices in Canada, and 66K for the coupe gets you and engine and tires.
You're forgetting about the exchange rate... the Canadian Dollar is worth less than the US Dollar, thus, the prices in Canada will be more.
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Old 09-26-2009, 02:30 PM   #42
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I just dont get into it, i preffer the sound of a hearty V8 roar, hearing that V8 and then an underlying vaccuumish high pitched thing just bugs me =/

But actually i just did some digging and apparently the LS7 concept camaro at SEMA had a "slightly modified 586hp engine" so i was right, it is easy to pump beyond the LSA's capacity on all motor (of course one could make the argument that the LSA could easily be pumped beyond THAT but then it just becomes mud-slinging) i think after hearing this news im back in favor of a slightly modified LS7 powering the Camaro, people can say "its been announced, its phasing out" and all that but by now we hould know announcements mean nothing in the world of supply and demand haha, especially when it comes to Camaros...just my oppinion but i would LOVE to be able to say "yeah my Z/28's got the stock 427" and i'd LOVE to hear "427 Camaro re-takes the throne from supercharged shelby" those three numbers just have such a legendary aura around them, its quite amazing ^_^


Vega, I agree with you 100% about the mystique of the 427 and the Camaro. I also think GM did it backwards w/ making the Z28 the so called "heavy hitter" w/ the larger engine unlike the Z28's of yore with their high revving little 302's. The nimble little, high revving, Trans-Am racer was the Z28 and the heavy hitting Brutes were the SS396's and the COPO 427's not limited to but including Don Yenko's Bad boys and Fred Gibb's ZL-1's.

I guess Now days its all about marketing and name recognition. Most people ( even the non-motorheads ) know what a Z28 is and they think "Z28...thats gotta be fast!!! but you tell them ZL-1 and they stand there scratching their heads......they haven't got a clue.

So I guess GM is smart to badge their GT500 Killer as the Z28 against some of our wishes.
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Old 09-26-2009, 05:17 PM   #43
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Originally Posted by radz282003 View Post
Hypereutectics are better now, I believe. They still aren't as good as forged slugs in the LS9, but they're better than the past.
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Someone with more knowledge about this please set me straight, but I thought
Hypereutectic pistons were inferior to forged pistons where higher power out-put
was concerned? That they couldn't handle some of the power add-ons as well as forged pistons could...
This Wiki quote is very informative.
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“Hypereutectic” refers to a metallic alloy which has a composition beyond the eutectic point. In materials science, the word eutectic refers to a specific ratio of chemical composition at which the constituent elements will form a single, homogeneous phase when cooled. Above or below this ratio, separate chemical phases will form during cooling due to insolubility of one constituent in the other. Most metals are not eutectic, and have different phases present in their cooled form. Hypereutectic pistons are made of an alloy of aluminum which has much more silicon present than is soluble in aluminum at the operating temperature. Hypereutectic aluminum has a lower coefficient of thermal expansion, which allows engine designers to specify much tighter tolerances.

The most common material used for automotive pistons is aluminium due to its light weight, low cost, and acceptable strength. Although other elements may be present in smaller amounts, the alloying element of concern in aluminum for pistons is silicon. The point at which silicon is fully and exactly soluble in aluminum at operating temperatures is around 12%. Either more or less silicon than this will result in two separate phases in the solidified crystal structure of the metal. This is very common. When significantly more silicon is added to the aluminum than 12%, the properties of the aluminum change in a way that is useful for the purposes of pistons for combustion engines. However, At a blend of 25% silicon there is a significant reduction of strength in the metal, so hypereutectic pistons commonly use a level of silicon between 16% and 19%. Special moulds, casting, and cooling techniques are required to obtain uniformly dispersed silicon particles throughout the piston material.

Advantages
Most automotive engines use aluminium pistons that move in an iron cylinder. The average temperature of a piston crown in a gasoline engine during normal operation is typically about 300C (600 degrees Fahrenheit) and the coolant that runs through the engine block is usually regulated at approximately 90C (190 degrees F). Aluminium expands more than iron at this temperature range so for the piston to fit the cylinder properly when at a normal operating temperature, the piston must have a loose fit when cold.

In the 1970s increasing concern over exhaust pollution caused the U.S. government to form the Environmental Protection Agency (EPA) which began passing legislation that forced automobile manufacturers to introduce changes that made their engines to run cleaner. By the late 1980s automobile exhaust pollution had been noticeably improved but more stringent regulations forced car manufacturers to adopt the use of electronically controlled fuel injection and hypereutectic pistons. Regarding pistons, it was discovered that when an engine was cold during start-up, a small amount of fuel became trapped between the piston rings. As the engine warmed up, the piston expanded and expelled this small amount of fuel which added to the amount of unburnt hydrocarbons in the exhaust.

By adding silicon to the piston's alloy, the piston expansion was dramatically reduced. This allowed engineers to specify a much tighter cold-fit between the piston and the cylinder liner. Silicon itself expands less than aluminium but it also acts as an insulator to prevent the aluminium from absorbing as much of the operational heat as it otherwise would. Another benefit of adding silicon is that the piston becomes harder and is less susceptible to scuffing which can occur when a soft aluminium piston is cold-revved in a relatively dry cylinder on start-up or during abnormally high operating temperatures.

The biggest drawback of adding silicon to pistons is that the piston becomes more brittle as the ratio of silicon is added. This makes the piston more susceptible to cracking if the engine experiences pre-ignition or detonation.

Performance replacement alloys
When auto enthusiasts want to increase the power of the engine they may add some type of forced induction. By compressing more air and fuel into each intake cycle, the power of the engine can be dramatically increased. This also increases the heat and pressure in the cylinder.

The normal temperature of gasoline engine exhaust is approximately 650C (1200F). This is also approximately the melting point of most aluminium alloys and it is only the constant influx of ambient air that prevents the piston from deforming and failing. Forced induction increases the operating temperatures while “under boost” and if the excess heat is added faster than engine can shed it, the elevated cylinder temperatures will cause the air and fuel mix to auto-ignite on the compression stroke before the spark event. This is one type of engine knocking that causes a sudden shockwave and pressure spike, which can result in an immediate and catastrophic failure of the piston and connecting rod.

The “4032” performance piston alloy has a silicon content of approximately 11%. This means that it expands less than a piston with no silicon, but since the silicon is fully alloyed on a molecular level (eutectic), the alloy is less brittle and more flexible than a stock hypereutectic “smog” piston. These pistons can survive mild detonation with less damage than stock pistons.

The “2618” performance piston alloy has less than 2% silicon and could be described as hypo (under) eutectic. This alloy is capable of experiencing the most detonation and abuse while suffering the least amount of damage. Pistons made of this alloy are also typically made thicker and heavier because of their most common applications in commercial diesel engines. Both because of the higher than normal temperatures that these pistons experience in their usual application and the low-silicon content causing the extra heat-expansion, these pistons have their cylinders bored to a very loose cold-fit. This leads to a condition known as “piston slap” which is when the piston rocks in the cylinder and it causes an audible tapping noise that continues until the engine has warmed to operational temperatures. These engines should not be revved when cold, or excessive scuffing can occur.

Forged versus Cast
When a piston is cast the alloy is heated until liquid, then poured into a mould to create the basic shape. After the alloy cools and solidifies it is removed from the mould and the rough casting is machined to its final shape. For applications which require stronger pistons, a forging process is used.

In the forging process the rough casting is placed in a die set while it is still hot and semi-solid. A hydraulic press is used to place the rough slug under tremendous pressure. This removes any possible porosity and also pushes the alloy grains together tighter than can be achieved by simple casting alone. The end result is a much stronger material.

Hypereutectic pistons can be forged but typically are only cast because the extra expense of forging is not justified when cast pistons are considered strong enough for stock applications.

Aftermarket performance pistons made from the most common 4032 and 2618 alloys are typically forged.
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Old 09-26-2009, 06:16 PM   #44
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Good find. This might help some people, with extreme worries about the OEM LSA pistons.

Thanks
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Old 09-26-2009, 11:12 PM   #45
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Vega, I agree with you 100% about the mystique of the 427 and the Camaro. I also think GM did it backwards w/ making the Z28 the so called "heavy hitter" w/ the larger engine unlike the Z28's of yore with their high revving little 302's. The nimble little, high revving, Trans-Am racer was the Z28 and the heavy hitting Brutes were the SS396's and the COPO 427's not limited to but including Don Yenko's Bad boys and Fred Gibb's ZL-1's.

I guess Now days its all about marketing and name recognition. Most people ( even the non-motorheads ) know what a Z28 is and they think "Z28...thats gotta be fast!!! but you tell them ZL-1 and they stand there scratching their heads......they haven't got a clue.

So I guess GM is smart to badge their GT500 Killer as the Z28 against some of our wishes.

haha yeah sometimes i get a little carried away and type a lot, but still thanks much, and yeah thats very true, im just not sure if todays market would work with the 60s set-up, i mean everything now is so linear and everyone's looking for the "next best" instead of just a car with different pros and cons so idk i could go for either fashion but the only thing that bugs me with today's idea is that you're gonna be giving your golden right nut for the good stuff, LOL

here's an idea, what if most, if not all, Z/28s were built on an "on-order" basis, where the customer ordering the car got to choose a crate engine and minor mods to each engine (such as cam) for the car to be built with? Are my ideas getting too far fetched yet? What if you could order specific air bags that when they inflate they take the shape of T-pain's head! XD
Yeepp, im gettin there...
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Old 09-27-2009, 09:05 AM   #46
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I hope an engine is made using a mixture of the LSA and LS9 in their thoughts.

Basically the LSA's 1.9L supercharger, cam specs, and same build dimensions,
but have in mind the LS9's bottom end strength. Doesnt have to be titanium, but just general forged pieces like a 03-04 Cobra and GT500 would use.

I think that would keep the cost reasonable and mass producable

aka LS8?
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Old 09-27-2009, 10:13 AM   #47
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Questions About Intercooler/Heat Exchanger Design

Dragon,

Thanks for the write up. Because you put so much time into it, perhaps you have some information on the intercooler and heat exchanger beyond what is written.

While the intercooler design is touted as something that "raises the bar in both packaging and efficiency," I do not see that design as being able to improve on the more traditional design which has the heat exchanger located away from the motor and the heat produced by the motor.

Maybe I am missing something (and I hope I am as the overall "look" of the unit is very appealing) but this design would not do anything to diminish heat soak and would seem to work in the opposite direction, given its location.

What I have seen of late is a heat exchanger with twin puller fans. You can see it on the Revan Racing web site (revanracing.com). Ignore the fact that it is not engineered for GM products yet but you can see that their approach should apply to any applicaiton, assuming there is room for it.

These big motors throw off a lot of heat and the problem with the 5.4 Ford motors that are supercharged (the motor addressed by Revan Racing) is heat soak. The GT500, as powerful as it is, cannot make its advertised power for a long period; not without something like what the Revan Racing set up does. Is your sense that heat soak is the common enemy with any supercharged motor and, yet, you rarely see it discussed?

Thanks, again, for the write up. The Z/28 is a car that needs to be built. Those of us who ran muscle cars in the 60's remember when the original version hit the streets. Sure would like to see it back, particularly with a power set up like this.

Jim
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Old 09-27-2009, 11:13 AM   #48
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The system delivers 250 kPa (about 36 psi) at idle or low speeds. Yet the electronic throttle management system can almost instantaneously increase fuel pressure to 450 kPa (65 psi) for sustained high-speed operation or wide-open throttle.
How much power do you think the 65 psi injectors will support? I'm guessing around 700 rwhp maybe a little less since it's forced induction. What injectors does the LS9 use?
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Old 09-27-2009, 02:40 PM   #49
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I hope an engine is made using a mixture of the LSA and LS9 in their thoughts.

Basically the LSA's 1.9L supercharger, cam specs, and same build dimensions,
but have in mind the LS9's bottom end strength. Doesnt have to be titanium, but just general forged pieces like a 03-04 Cobra and GT500 would use.

I think that would keep the cost reasonable and mass producable

aka LS8?
Thats a great idea, my biggest beef with the LSA is its lack of forged parts, although it should be noted that the LS9 is somewhere in the ball part of 530lbs dry, but that'd be assuming we'd use the LS9 as the base, id be more for using the LSA as a base and just adding forged parts and modifying the engine some to up the horses a few
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Old 09-27-2009, 05:24 PM   #50
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Quote:
Originally Posted by clark17357 View Post
Dragon,

Thanks for the write up. Because you put so much time into it, perhaps you have some information on the intercooler and heat exchanger beyond what is written.

While the intercooler design is touted as something that "raises the bar in both packaging and efficiency," I do not see that design as being able to improve on the more traditional design which has the heat exchanger located away from the motor and the heat produced by the motor.

Maybe I am missing something (and I hope I am as the overall "look" of the unit is very appealing) but this design would not do anything to diminish heat soak and would seem to work in the opposite direction, given its location.
Jim
The intercooler design is pretty exceptional, to tell you the truth.
Here are some pictures of the supercharger/intercooler to start you off:

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Where traditional positive-displacement systems (like the GT500) have an intercooler mounted in between the supercharger and the engine block, the LSA's approach is very different, and offers a number of advantages. The supercharger is flipped upside-down, and pushes air UP, into the intercooler brick + intake housing. This design lets the supercharger belt be a little shorter, it allows the intercooler to be far more effeciently designed, and it allows the air to take a straighter path down into the cylinder, resulting in more torque.

It's a water-to-air system, so the heat-exhanger is mounted traditionally -- that is, down with the radiator and oil coolers, etc. As it was written in the article, this design drops the intake temperature over 150 degress...which is very important for durability and performance. I'm sure GM doesn't condone the use of ice, or ice-chilled water...but with an intercooler this efficient, if someone were to cool the liquid down. You would see tremendous power gains, I think.
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