How my horsepower am I giving up with a .635 lift cam.
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I am using a TSP custom cam and the I/E lift is .635". However, they do offer lobes that have lift of .655/.657 and I am wondering how much whp , if any, that I am giving up with the slightly lower lift on my current cam.
I am using AI ported heads. Here is some information that I found on their flow numbers. |
I would guess 10-20 peak. But you might lose a little in the beginning of the power curve. What is your power goal and main use for the car? |
I believe your duration and LSA will have more of a determining factor. Lots of LS7's out there with lifts < .650" who make plenty of power. If you're gains are so high in the RPM band that you rarely ever see anyways, you're not actually "realizing" those gains.
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Originally Posted by BigVette427
(Post 1597007129)
I believe your duration and LSA will have more of a determining factor. Lots of LS7's out there with lifts < .650" who make plenty of power. If you're gains are so high in the RPM band that you rarely ever see anyways, you're not actually "realizing" those gains.
I am sure that I give up some peak whp with the +4 advance but I am not that familiar with how lift factor in whp numbers. If I had this same same cam with a .655 lift, would I see any difference in mid range or peak whp and if so, approximately how much. |
.02" more lift with the same duration and lobes would not be a big difference. That is not even as much lift difference as going from a 1.7 to 1.8 rocker on an early LS (LS7 is already 1.8).
I'd guess 5hp tops, if that? Definitely under 10hp. |
If I were using stock rockers I would just stay at .635" lift, engine longer valvetrain life, give up a couple hp
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