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Old 09-08-2011, 12:11 AM   #1
Mr CLuTcH
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High RPM Rev Limit

What would it take to turn a L99 or LS3 into a high revving v8? And is it even a good idea to have a big displacement V8 that revs that high? (8,000 RPM limit)

I just get tired of hearing reviewers boast on Ferrari and BMW cars which have all of these 8k rev limits and blah blah blah, dual-clutch this and dual clutch that. I just noticed our Camaro's have at least 9k RPM on the dash, I'm just wondering, why does it even go that high if we'll never get to utilize the power, mind you I have not the slightest clue how engines work. Im just a pro bench racer.........
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Old 09-08-2011, 08:06 AM   #2
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I'm no expert but I can tell you what I know. First, the BMW and Ferrari's are much smaller displacement V-8's so it's easier to rev higher with smaller internals. With the LS3 or L99 6.2 liter engines you would have to replace the internals (crank, pistons, rods, etc.) with lighter forged components. Even then you might get her to spin up to 7,000 rpm's. It's a matter of physics, lighter smaller = higher revs!

I know the Nascar engines rev pretty high, over 8000 rpm's so maybe a Nascar engine builder would have some insight here!
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Old 09-08-2011, 08:21 AM   #3
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Just like SSMike said, weight of the internals is very important. Also, balancing is important. By reducing the weight you have less issues with the balancing. You will probably have to do both to get to 8K RPM. On the plus side V8s are easier to balance than a V6, and the 90 degree geometry is also a plus. I would think you could do it; just a matter of money. It would be awesome to have a high reving, high compression 6.2L engine though.
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Old 09-08-2011, 08:29 AM   #4
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Quote:
Originally Posted by GretchenGotGrowl View Post
Just like SSMike said, weight of the internals is very important. Also, balancing is important. By reducing the weight you have less issues with the balancing. You will probably have to do both to get to 8K RPM. On the plus side V8s are easier to balance than a V6, and the 90 degree geometry is also a plus. I would think you could do it; just a matter of money. It would be awesome to have a high reving, high compression 6.2L engine though.
Like he said, it is doable, it really depends on how much money you are willing to shell out.
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Old 09-08-2011, 08:55 AM   #5
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Its a small block chevy, 7k is no problem... it would take a better set of rods to be safe but the stockers would hold, valve train upgrades is whats important at that level, all you need is the right cam and head work. 8k would take a better set of heads and a real BIG cam to make power that high,. The short block of these Ls motors can handle plenty of revs... with a piston and rod upgrade 8k would be no problem, the crank is plenty strong. I would think it just needs to be balanced spot on with a real good damper and the right machine work. Hard core racers spin the hell out of these things!
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Old 09-08-2011, 11:10 AM   #6
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we have most of the parts for our 8500rpm lsx motor, it requires some math and some serious parts.

you need lightweight parts, highpressure valvesprings, strong pushrods and a shorter stroke all help.
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Old 09-08-2011, 11:39 AM   #7
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Quote:
Originally Posted by Mr CLuTcH View Post
What would it take to turn a L99 or LS3 into a high revving v8? And is it even a good idea to have a big displacement V8 that revs that high? (8,000 RPM limit)

I just get tired of hearing reviewers boast on Ferrari and BMW cars which have all of these 8k rev limits and blah blah blah, dual-clutch this and dual clutch that. I just noticed our Camaro's have at least 9k RPM on the dash, I'm just wondering, why does it even go that high if we'll never get to utilize the power, mind you I have not the slightest clue how engines work. Im just a pro bench racer.........
Big cam and good Valve Train parts.

We turn the LS3 7400 Regularly.

Ted.
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Old 09-08-2011, 11:49 AM   #8
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May want to take a look at our little beauties, they were designed for this particular situation as more and more are spinning their LS3's and 99's higher than ever.

http://www.camaro5.com/forums/showthread.php?t=166606
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Old 09-08-2011, 11:55 AM   #9
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our shop camaro is just a bolt on cammed ls3 car and erik has been spinning it to 7400rpms for 2 years on the road course. just has our basic valvetrain upgrade.


the problem with running extreme rpm on your average car is reliablity. ferarris high rev v8's are flat plane cranks, balanced about as perfect as you can get in a production motor, and the tolerances are extremly tight. those motors are very very expensive to produce and not really cost effect to most companies.

small blocks can be made to rev and have for many many years, but you look at what your going to be using the car for and build accordingly.
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Old 09-08-2011, 03:41 PM   #10
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Thanks! All of you have provided me with GREAT information!
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S.I.M. SS(L99):
*American Racing Headers (LT)
*Magnaflow cat-back competition exhaust
*K&N typhoon CAI
*Aggressive cam.
*Tune
**Result**: 465rwhp/ 447rwtq. Satisfied.
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Old 09-08-2011, 07:31 PM   #11
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Our valvetrain upgrade kit has been proven to 73-7500rpm. I would not go much beyond 7500rpm on a stock engine.
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Old 09-08-2011, 08:45 PM   #12
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@ Torq and JRE,

What lifters are you guys running in the 7400 to 7500 rpm motors?
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Old 09-09-2011, 08:55 AM   #13
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@ Torq and JRE,

What lifters are you guys running in the 7400 to 7500 rpm motors?
GM
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Old 09-09-2011, 09:06 AM   #14
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Ditto. Works great.
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