Carby's --(bob, perth)

[old forum]

can anyone tell me the difference between downdraught and sidedraught carby's, what the best one for use on my gem??

[old forum]

Due to the shitty design of the sidedraught webber manifold, you are way better off using downdraughts.
The sidedraught manifold has an s shape in the middle of the manifold, to clear the brake master, (which also needs modifying to fit sidedraughts) and on the flow bench , this restricts air speed something severe. Downdraughts require no modifying of the brake master and have a much better flowing manifold, but they are normally a lot more expensive. Expect to pay $500 for sidedraught 40mm webbers, and up to $800 for sidedraught 45mm and downdraught 42, 44, 45mm webbers.

[old forum]

Yeah, IDFs are the go, whilst in a perfect situation DCOEs are the gun carby but because of the booster you will need the shitty S-bend manifold, either that or relocate the booster (f#@king difficult).

Having seen IDFs set up on flow benchs and engine dynos they are still a world ahead of just about any other option (injection perfection throttle bodies on a custom 25 degree curved manifold anyone??) and will make about the most power you can expect from any naturally aspirated induction setup.

[old forum]

thanks guys