Cam timing

Engine, intake, exhaust, EFI, chain, sprockets, etc.
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cdale490
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Joined: Wed Mar 10, 2021 10:41 pm

#1 Post by cdale490 »

What is the best cam timing for a 1/4 mile oval something with a good mid and top hit?

SlOoT
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Joined: Wed Mar 10, 2021 10:41 pm

#2 Post by SlOoT »

List with timings:

106i/106e is factory spec and is strong on the bottom and mid
106i/109e settings are reported to have a smooth power delivery and more on top
107i/108e settings are reported to work well for mx with a strong mid and top
108i/106e settings are reported to have a good top end hit without loosing too much low and mid
108i/108e settings sacrifice some bottom and mid for more top end

And a quote from C27:

On my 432 ported motor I am 111in and 108ex with open airfilter and exhaust loss of bottom end isnt a issue.With airbox on and toaster exhaust the bottom end loss is huge but works well for me in the tight Harescramble trails since I am real slow there anyway.Once its revving it hits hard almost Banshee like.54hp with open filter and exhaust 49hp with airbox and toaster.

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