|
There's no doubt flatslides make better power than CV (for the same size), but Springer makes a very good point. Simply sticking a bigger carb on a bike isn't necessarily going to make more power, and might cost you some. For every engine and desired power curve, there is an optimal size carb.
"The key to choosing the proper carburetor size is velocity – the same theory we used to choose the proper intake. It’s even more critical here since the carburetor supplies fuel to the engine by “measuring” the pressure of the airstream as it passes through the carburetor’s throttle bores. If too large a carburetor is fitted, a false pressure signal is generated and fuel delivery is imprecise which results in a poor running engine. "-O'neill Williams
Intake airstream velocity needs to stay high whether your engine is a lawnmower or dragster.
"But higher air flow numbers do not necessarily translate into more power, as many in the engine development field (including yours truly) have discovered. Ford's engineers were then vastly ignorant of the world beyond Michigan's borders. They had no idea Harry Weslake and Wally Hassan (who created the very successful Coventry-Climax racing engines) had learned years before not to take too literally what the flow bench said. They were narrowing intake ports to provide nominal gas speeds in the range of 350 to 400 feet-second, making good use of the fact that kinetic energy packing air into the cylinders increases with the square of it's velocity."
Michael
|
