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Author Topic: intake to exhaust ratio  (Read 1620 times)

Offline glenn71

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intake to exhaust ratio
« on: January 13, 2007, 07:50:39 AM »
What do you guys aim for for intake to exhaust flow, 75%?If so do the current batch of cams around suit this ratio or the stock in/out ratio.I,m told the exhaust needs a bit of work and would that then allow you to run a smaller exhaust cam to minimise overlap and maximise bottom end?
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Offline mike46

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Re: intake to exhaust ratio
« Reply #1 on: January 13, 2007, 10:42:47 AM »
You will gain a good bit working on the exhaust side. Most people don't realize this because it's not as "glamorous" as big intake ports. You can go higher than 75%....that's old school. 85%  to 90% will work especially with large engines (IMO). In general, you can control overlap (unless you run a lot of duration which I don't recommend in general) with cam timing. Keep in mind though....I'm stuck in the mid 70's...er... I mean 80's. :wink: :lol:
« Last Edit: January 13, 2007, 10:45:37 AM by mike46 »
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