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Power Now???? dyno
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[QUOTE="Swiss, post: 619937, member: 26417"] Quote: "Funny thing is, the first time I looked at a bike carb, I wondered why there was no venturi booster. Anyone ever tried to put a conventional venturi booster in a dirtbike carb, ie complete with fuel passages through the supports as in a standard Carb? And yeah, they're pretty damn necessary for any kind of fuel atomization in a V8 with a big ass cam. Maybe they'll experiment with them in the 4 strokes some day when valve timing design becomes more aggressive for upper rpm. Maybe they'll just throw in the towel in lieu of FI." I THINK that I have seen a version of a Harley carb that used a booster. Actually, in a car carb this isn't much aditional weight and as you said, it is pretty much a necessary complexity for good performance. With MOST bikes they can get by with lighter and CHEAPER non-booster designs. With the FI units, they are learning that smoothness is imoproved with the newer design dual butterfly systems. This is where your throttle cable controls one butterfly and the computer controls the other. The second unit is dependent on speed, rpms and various other data inputs from sensors on the bike. Back in the early '60s Honda had a CV carb on one of its small roadbikes that used a vacuum/diaphram controlled slide with a finger lever on top that controlled how far it opened and gave a positive control over closing. It seamed to be a neat system, but was replaced by butterfly and all vacuum units. Sorry to get off the topic a bit. Swiss [/QUOTE]
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MX, SX & Off-Road Discussions
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Power Now???? dyno
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