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what size throttle bodies
Stuart_B - 13/9/09 at 03:57 PM

hi all, what size throttle bodies do i require to run a 2.0 duratec.

thanks

stuart

goaty - 13/9/09 at 04:09 PM

do you mena bike ones or Jenvey style?? big price diff.
Raceco do some lovely ones if the budget allows. 54mm

http://www.raceco.com/

flak monkey - 13/9/09 at 04:24 PM

Most of the aftermarkets seem to be 48-52mm SBD etc)

I put gsxr750s on mine which are 42mm.

Theoretically 42mm bodies will flow enough for 200bhp fairly easily.

Stuart_B - 13/9/09 at 05:04 PM

bike throttle boddies.

i just saw a set but only 38mm, so might not be bigger enough then.

thanks

stuart

fatbaldbloke - 13/9/09 at 08:14 PM

I have 38mm GSXR 600 TB's on my Zetec, 174 bhp at the flywheel on the rolling road and a little bit of duty cycle still left. I would have thought I could get close to 200 before having to upsize.

[Edited on 13/9/09 by fatbaldbloke]

MikeRJ - 14/9/09 at 05:00 AM

quote:
Originally posted by flak monkey
Most of the aftermarkets seem to be 48-52mm SBD etc)

I put gsxr750s on mine which are 42mm.

Theoretically 42mm bodies will flow enough for 200bhp fairly easily.


The guy that built my friends Pug 205 rally engines turned up some venturis to fit inside 45mm Jenvey bodies to take them down to 42mm. He reckoned the increased gas speed in the area the fuel was injected would give a better spread of power and it's making ~275bhp on these!

flak monkey - 14/9/09 at 06:59 AM

quote:
Originally posted by MikeRJ
quote:
Originally posted by flak monkey
Most of the aftermarkets seem to be 48-52mm SBD etc)

I put gsxr750s on mine which are 42mm.

Theoretically 42mm bodies will flow enough for 200bhp fairly easily.


The guy that built my friends Pug 205 rally engines turned up some venturis to fit inside 45mm Jenvey bodies to take them down to 42mm. He reckoned the increased gas speed in the area the fuel was injected would give a better spread of power and it's making ~275bhp on these!


Would make sense as it would increase the speed of the mixture at lower throttle openings, giving better mixing and cylinder filling. Shouldnt make much difference at the top of the rev range, but should increase the power band.