Originally Posted by Markb_s1
depends on the spec of the rest of the engine...
on a standard zetec, 45 would be fine for carbs, so i would expect TBs to be a little smaller then that.
iirc, 45mm tbs are equivalent to 48/50 carbs.
Mine is high comp, RaceLine flowed head and cams to match, pectel T2 , uprated valve springs and ARP rod bolts.
I ve seen some R1 throttle bodies local to me , think they are only 38mm though. Will i need bigger then? What is the advantages/disadvantage of running bigger or smaller?
Im going to enclose them as space is a premium in a fiesta and without a scoop i dont think they will get adequate flow to them. Plus i would like to retain my BMC carbon filter thats fed from the fog light.