Quote:
Originally Posted by vangisback
Agreed, i misunderstood your previous post. However, my understanding is that some J35 and most J37 engines have VTEC on both intake and exhaust whilst remaining SOHC. Anyway, my apologies for derailing this thread lol.
F20c 4-life!
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You can certainly have multiple sets of both intake and exhaust cams on SOHC, but the problem with SOHC is that it's quite complicated to get the exhaust and intake lobes adjusting separately timing wise (phasing), so usually they don't. That's actually pretty significant, being able to advance the exhaust opening while retarding intake opening is how you cut overlap and thus make the engine run better at idle and such, and it's why variable lift systems are kind of rare: having just the ability to phase the cams already does a lot.