racesupplies wrote:My flatslides are 32,is 34 to compensate for the butterfly?

My FCR have 33mm and the smallest size of the jenvey bodies is 34mm. Pls explain what do you mean with: to compensate for the butterfly? Sorry i´m a stupid German

Michael

Not a stupid German at all,I have seen your bike.Are you west or east? No I asked because my flatslides are 32mm.when fully open allmost clear.Injector bodies have butterfly in so larger size to compensate?

Ah, this makes sense.

From http://www.vespalabs.org/User:Internets ... _Injection" onclick="window.open(this.href);return false;

No venturi effect needed, aim for a bit more in a throttle body size than in a carb (i.e. if you were to go 30mm carb go 34mm throttle body)

Also you may find this useful (or at least interesting), its a 2-stroke so rather different but same principles apply.
http://www.smcomp.com/~smurph/RZ-EFI/index.html" onclick="window.open(this.href);return false;

Druid

Michael, you have a PM!

/Lasse