How much will the stock bottem end take?
Thread Starter
Launching!
Joined: Feb 2004
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How much will the stock bottem end take? 
I'm doing a build up, with a nice Head and cam package and some minor bolt on's but before its said and done... I'm shooting to get some high to mid 11's all motor. I was just concearned about the bottom end. I dont want to build a car that cant take the power so I figured I'd find out how much the stock bottom end will take before i need to worry. 
TECH Fanatic
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Short answer: more than you're going to throw at it, as long as you don't plan on revving too high.
I don't think a h/c will outgrow your bottom end. Depending on which cam, you will probably be less than 450 RWHP. You'll have to worry about your tranny (A4)/clutch(M6) and rear first.
I don't think a h/c will outgrow your bottom end. Depending on which cam, you will probably be less than 450 RWHP. You'll have to worry about your tranny (A4)/clutch(M6) and rear first.
TECH Apprentice
Joined: Jul 2002
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From: Ohio
Mike Brown's Twin Turbo CE was running 9.85 @137 stock bottom end, what about 750rwhp give or take 50...ran over a year with no problems...when he finally pulled it apart to install forged parts, it showed no wear or tear... 
I say you can even go 6800 without any problems. The botton end is very strong until you start throwing a ton of boost of a huge shot of juice.
Make sure it is tuned properly and it will run a long time.
Make sure it is tuned properly and it will run a long time.
Thread Starter
Launching!
Joined: Feb 2004
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Originally Posted by NataSS Inc
I am at 430rwhp through a moser "9. That puts it at about 525 fwhp and so far *knock on wood* no signs of even phasing the bottom end.
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Originally Posted by JZ'sTA
I say you can even go 6800 without any problems. The botton end is very strong.
The next week I got the car shifting right and made 4 passes including a personal best. However, I started up the car a few days ago and at idle a very audible knock could be heard. Putting my hand on the water pump, the knock was very noticeable. I'm all freaked out that I spun a rod bearing that night it was shifting at 6800.
Is that even possible, to damage a rod bearing but then run 4 passes a week later including a personal best?
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Pewterz28- Whats up man? Hate to hear that about your car!
*As for what I've been told, alot of guys have told me to just run some APR rod bolts in a stock bottom end and it should be good for 6500-7000 runs. I'm not too sure about the high end of that (7000rpms) but I know I won't be scared to shift it at 6500-6700. Good luck with it all!
*As for what I've been told, alot of guys have told me to just run some APR rod bolts in a stock bottom end and it should be good for 6500-7000 runs. I'm not too sure about the high end of that (7000rpms) but I know I won't be scared to shift it at 6500-6700. Good luck with it all!
Originally Posted by GTA91
Pewterz28- Whats up man? Hate to hear that about your car!
IMO, I've been fairly conservative, always setting my car to shift under 6600 and never having my rev limiter higher than 6800. I have the rev set at 6650 now but I am hitting the rev limiter on my shifts so I'm either going to have to lower my shifts or raise the limiter. First I need to find the culprit of the tap though. I'll look at it some more today at lunch, hopefully it is something simple.
I don't see why not. Hundreds if not thousands on "the boards" have been doing it. Just don't spin too high. I don't know what that number is and it is probably different for each car. Too many factors; mileage, wear and tear, oil levels, etc. Just be as conservative as possible with your shift points without sacrificing too much performance.
TECH Apprentice
Joined: Jul 2002
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From: Ohio
Originally Posted by Ohmyneck
So basicaly if I go with a H/C package and a 12-bolt my bottom end should hold up just fine? I'm shooting for some mid 11 second times without any nitrous.
