KRMit Posted January 13, 2005 Report Posted January 13, 2005 I currently have 120psi on both cylinders. I'm about to put a Trinity modified head on which should boost me to about 155psi. My question is how to tell when a rebuild is needed. I know on stock cylinders you need to do it when you get close to 100psi. Quote
sredish Posted January 14, 2005 Report Posted January 14, 2005 Well, generally it's time to rebuild when your compression drops considerably from where it should be. Stock is around 120 or so, and when it drops to 100 to 95 OR each cylinder varies from each other quite a bit, a rebuild is recommended. When this occurs, starting trouble may be noticed or some other unreliability issues. The same occurs with high compression. If you start with 155 and after awhile you notice it's dropped to 125, then you've obviously lost compression and it may be time for a rebuild but if it's still even and running good you can keep running it if your happy with the performance. A rebuild may also be necessary if you find one has dropped considerably more than the other. They need to be even because of the crank. If one drops to 150 and the other drops to 135, then one puts considerably more pressure than the other and that can cause your crank to twist. But then, I might not have a clue on what I'm talking about. Quote
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