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Old 03-04-2009, 02:16 PM   #43
spd98
 
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Quote:
Originally Posted by Roger Ramjet View Post
I'll be doing the "Rapid Break-in Procedure". Because the piston rings need cylinder pressure to seal, engine loading to a moderate RPM is essential. You only have a few minutes of operation before the cylinder honing grooves get worn smooth. Get the engine warm and run it up through the gears at half throttle. Let the engine cool to less than 100 degrees F and you are done with the break-in. This run and cool cycle will also break-in the rear gears. Always avoid hard braking for the first few stops.
You do realize that cylinder pressure is not variable. Therefore that whole theory is moot.
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Old 03-04-2009, 03:04 PM   #44
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Quote:
Originally Posted by spd98 View Post
You do realize that cylinder pressure is not variable. Therefore that whole theory is moot.
Huh! Would you care to explain?
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Old 03-04-2009, 04:19 PM   #45
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Quote:
Originally Posted by Roger Ramjet View Post
Huh! Would you care to explain?
I think what he meant is whether the engine is doing 800 rpm or 3500 rpm, at the top of the piston stroke, the pressure within the cylinder is the same. What he's missing IMO is the torque and stresses exerted within the engine when under load (drivetrain engaged) vs. revving in neutral.
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Old 03-04-2009, 06:59 PM   #46
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My logic:
Peak cylinder pressure occurs around 17 degrees ATDC - not at TDC. Brake Mean Effective Pressure (BMEP) in the cylinder varies with throttle position and RPM. BMEP is highest at peak torque RPM. Therefore, accelerating with moderate throttle and moderate RPM will increase the piston ring to cylinder wall pressure and attain a better seal. Better ring seal is more gas mileage and more power.
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Old 03-04-2009, 09:30 PM   #47
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They are ran enough throughout the rpm band at the factory. All you need to do is to drive the car for a half hour varying the rpm from 2k to 2500. Then you can haul ass after that. I would personally recommend changing your oil after 3k and putting in a good oil. I use royal purple on the my camaro religiously and I beat the hell out of it every chance I get.
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Old 03-07-2009, 04:11 PM   #48
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You guys are funny...

Here's what Chevrolet says in the Corvette Owners Manual about Brake In Procedure(s):

Starting and Operating Your
Vehicle
New Vehicle Break-In
Notice: Your vehicle does not need an elaborate
break-in. But it will perform better in the long run if
you follow these guidelines:
• Keep your speed at 55 mph (88 km/h) or less for
the first 500 miles (805 km).
• Do not drive at any one constant speed, fast or
slow, for the first 500 miles (805 km). Do not
make full-throttle starts. Avoid downshifting to
brake or slow the vehicle.
• Avoid making hard stops for the first 200 miles
(322 km) or so. During this time the new brake
linings are not yet broken in. Hard stops
with new linings can mean premature wear and
earlier replacement. Follow this breaking-in
guideline every time you get new brake linings.
Following break-in, engine speed and load can be
gradually increased.

I'd bet the Camaro's Owner's Manual will read exactly the same.
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Old 05-21-2009, 11:10 AM   #49
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I have posted this before but again for you guys buying new.

Try the new Royal Purple Break in Oil. Lots of Zinc.
http://www.royalpurple.com/breakin-oil-rh.html


I trust RP enough to recommend it. If you plan on going towards or beyond 200,000 miles use this product. Just drain the oil into a container and you can either put it back in after using the RP Break in Oil or put it in the recycler.

And as far as the warranty.. what they don't know won't hurt them. It will look like burnt out old Mobil1 when your done.
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