Carburetor Spacers?

[Finnigan]

Doing a cb450 project and I've been looking at carbs, according to legend this bike's high RPMs are happy with a longer intake path. Hansen's race motors have blocks on the intake ports to have the carbs out further and according to his correspondence his 325$ velocity stacks are 5 inches long.

To the point: Has anyone experimented with carb spacers? Know any vendors?

 

[High On Octane]

I use a carb spacer to keep the fuel from cooking inside of the carb. But generally speaking, a long intake track is only good for actual purpose race built motors that are constantly in high RPMs all the time. The longer the intake track, the more low end you will lose, and generally normal street use will suffer. Perhaps the set up you are talking about is different, but I wouldn't do it unless the bike is going to be at full throttle most of the time.

 

[TomTerrific]

Longer usually means the tuning comes in lower rpm. The runners need to be pretty long for perfect tuning. There is also a ram effect which uses inertia of moving mixture.
Keeping the throttle close to the valve gives good overall running for a street bike.
Tom

 

[Finnigan]

Thats great info guys, thanks