Martym Posted January 15, 2017 Share Posted January 15, 2017 my 1.6 vx 8v 40 DCOE`s have 30mm chokes, I have another set of 30mm chokes & I am wondering if it would be worth boring these out to 32mm & fitting them to carbs. I know mains jets will need increasing. ? Link to comment Share on other sites More sharing options...
Martym Posted January 16, 2017 Author Share Posted January 16, 2017 Will stick with google from now on & the other tech page. Link to comment Share on other sites More sharing options...
oilyhands Posted January 17, 2017 Share Posted January 17, 2017 For a 1600 peaking at 5500 30mm chokes are ideal, if you are peaking at 6000 then 32mm is about right, 34mm would be right for peaking at 6500-7000.Oily Link to comment Share on other sites More sharing options...
Martym Posted January 17, 2017 Author Share Posted January 17, 2017 Cheers, read/seen these figures on www. I think engine compression can play a part too plus also read this which got me thinking ie Caterhams being very light. "Weight of the vehicles, the lighter the vehicle for a set eng capacity, increase the choke size"Was hoping an owner of same car might have 32mm chokes in their carbs & could offer thoughts Link to comment Share on other sites More sharing options...
Richard K Posted January 18, 2017 Share Posted January 18, 2017 I have a 1700 x/f and when I took it for a rolling road session the chokes were found to be large (can't remember how big) but on advice from 'The two Steve's' they were replaced with standard 30mm.much better all round drivability on the road.Richard Link to comment Share on other sites More sharing options...
Martym Posted January 18, 2017 Author Share Posted January 18, 2017 Thanks Richard, had a 1700 tuned xflow Caterham which had 32mm chokes & it drive good. Better than it did with the bored out chokes car came with. I have machined out the spare 30mm chokes to 31.85mm, in process of putting carbs i just serviced back on car, so will try them out, if no better or hopefully no worse i can just fit the other 30mm set. Link to comment Share on other sites More sharing options...
Martym Posted January 20, 2017 Author Share Posted January 20, 2017 Fitted the carbs I just purchased/serviced with the 32mm chokes to car, Fired up first go & happy with the way car drives. Now to give carbs I took off a little clean up... oh the joys of tinkering.. Link to comment Share on other sites More sharing options...
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