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Post by wkamil23 on Jan 13, 2021 19:33:55 GMT 1
Hi, Has anyone played around with velocity stacks any benefits in power? If so what length & diameter should I play with? Thinking of keeping the standard airbox tray and inserting velocity stacks/ trumpets inside the box. I'm currently building YPVS 350 F2 that will be chasing speed record. Therefore, it will be running high RPM!
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Post by muttsnuts on Jan 13, 2021 20:47:38 GMT 1
there are some benefits to be had, done some work in this area on race bikes, there is a lot of trial and error TBH, I have my own dyno so its easy to have a play with different lengths, styles etc, if you don't, then its going to get expensive and frustrating very quickly trying to work out what might or might not work
I found that if something worked on one engine, it didn't always transfer over to another, probably down to variations in exhausts, carbs, ignition, compression ratios etc, etc
Ideally what you want to aim for is getting the air speed up and keeping it there, and most importantly, getting the "air straightened" before it hits the carbs intakes, if you can do that you'll optimise the carbs abilities to deliver air/fuel at a good constant ratio, the other challenge you will have is the shape of the needle, I found playing with that had a pretty big impact on how well the stacks worked at certain throttle positions, although given your going for "speed records", then that shouldn't really come into it other than at WOT, in which case probably the thinnest needle you can find to allow the maximum fuel through !
last point, are you thinking of using flat slide carbs or round slide carbs as that makes a big difference as well !
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