Afternoon all..

I have a 2045cc zetec being built, and we will be using a Weber Alpha throttle body kit.

It will be installed in a mk6 escort, which will see lots of use on the track next year. Main objective with the engine is a smooth power band from 4000 to 7500, not just a peak power figure.

I have the complete 40mm throttle body kit which is sold for the 1.8 zetec. 45mm throttle bodies are sold for the 2.0 zetec.

I hope the smaller TBs will give a smoother power curve, and more torque in the mid-range due to higher air velocity.

I was just wondering if anyone has used 40mm bodies on a similiar engine, or knows of the effect of changing sizes of throttle bodies?

Any help would be class..