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Canadian Daves JustKDX
rad valve?
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[QUOTE="canyncarvr, post: 109297, member: 16552"] The Boyesen catalog lists the 12x for the KDX250. It lists the 14xa for the 200-220. Regarding flow in general and bored carbs in particular.... Any abrupt change in volume of parts is going to cause a turbulence problem. You'll end up with all sorts of swirls and eddies in the airstream that would lead to a subtraction from any rareified process already accomplished by upstream 'ductwork'. You'd have more of a problem with a mismatch of mating surfaces than you would slight volume changes. The swirls and eddies and associated pressure changes cause fuel to drop out of suspension (if your lucky enough to have it really atomized in the first place)..and any fuel not going where it's supposed to is obviously a problem. That being so, I wonder if there is anything to worry about with a 35.68mm rad valve and a RB modified (bored to 36mm) carb because the plenum divider is going to take up some of the 36mm. It's NOT always true that bigger is better. There's something to be said for velocity and ram effects of smaller air passages. The harmonics involved particularly in 2-stroke engines intake tracts will have a more pronounced effect on a smaller area, too. 39mm is a different issue altogether. Dan...time to get out your modification tools to divide and conquer this problem as you have others. Wouldn't you think boyesen would put their stuff on a flow bench rather than just come up with something that fits a particular bolt pattern? I'd hope so. I have a Holley 4779S that I need a manifold built for. I think the 'double pumper' option of that carb would work great on my 200 scooter! [/QUOTE]
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Dirt Bike Discussions By Brand
Canadian Daves JustKDX
rad valve?
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