1st Generation Specific (1979-1985) 1979-1985 Discussion including performance modifications and technical support sections

Velocity Stack length?

Old 01-25-03, 04:09 PM
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Velocity Stack length?

well, right now, my dellorto has what i think are 2.5" stacks on it...

is there any benefit to going longer or shorter? I see a lot of aircooleds running around with 6" stacks and things like that, just wondering.
Old 01-25-03, 04:18 PM
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You can use velocity stacks to tune you engine for a certain power band. The longer the stack the lower in the rpm range the powerband is. The shorter the stack the higher. Every engine is different and has different requirements. Try different lengths and see which one works best for you.
Old 01-25-03, 05:35 PM
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Well you're sort of limited with where the manifold is, and where the oil filler pedestal is. How would you have any longer stacks without hitting the oil filler pedestal?
Old 01-26-03, 03:05 AM
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custom work!
Old 01-26-03, 07:55 AM
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Originally posted by SilverRocket
Well you're sort of limited with where the manifold is, and where the oil filler pedestal is. How would you have any longer stacks without hitting the oil filler pedestal?
6" stacks would work fairly easily.... i think
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