You can do one of two things to bandaid things. Let's say your exhaust port is lazy and only flows 65cfm at. Good performance could be expected if the exhaust port flowed 80cfm. Just for simplistic numbers, let's say you have a intake port that flows 100cfm. That's why forced induction like blowers and turbos make such a DRAMATIC increase of power with only 5 and 6psi of boost. There is a BIG difference between the vacuum intake side, and the forced exhaust stroke. Just keep in mind the intake charge is drawn into the clinder by the pressure drop (vacuum) created as the piston decends the bore. The exhaust can be less because the exhaust is forced from the chamber by the piston rising in the cylinder. You want the exhaust to flow 80% of the CFM number the intake will flow. There a lot of things involved in intake and exhaust flow, but the magic number is around 78-80% (depending on which engine builder you takl to). What would happen if you used the 1.5 rockers on the exhaust and the 1.6 on the intake?Īnswer Courtsey of our own moderator Marv Davis So if this is the case, here are some hair brained thoughts on the idea. I read in the above mentioned thread that you have to "subtract" the "gain" from the exhaust side. Question: why do folks not add the 1.6 rockers to existing motors to increase cam lift?
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