John Hartley Posted August 22, 2000 Share Posted August 22, 2000 I just added 45DCOE's on a 2.0 Zetec and found the throttle plates too low. That is they are below the first progression hole. I think I need to drill an additional hole. Has anyone done this? What size hole? I have 3 holes now, should I add one more? Thanks. Link to comment Share on other sites More sharing options...
Anna Rexia Posted August 22, 2000 Share Posted August 22, 2000 Why are you up at 4.00 a.m.? Link to comment Share on other sites More sharing options...
I.Mupferit Posted August 22, 2000 Share Posted August 22, 2000 He's wondering about holes! Link to comment Share on other sites More sharing options...
Site Manager Posted August 22, 2000 Share Posted August 22, 2000 Anna, John's in the US, the time shown on the posting is the UK time. Link to comment Share on other sites More sharing options...
MARK WARREN Posted August 22, 2000 Share Posted August 22, 2000 A friend had to do this to his 45's, I think he got the info from 'RACELINE', anybody know their web address ? Sorry I can't be more helpfull. By the way, was your Zetec on injection prior to fitting 45s, I believe Caterham do injected Zetecs for the US or Canada. Cheers. Link to comment Share on other sites More sharing options...
Roger King Posted August 22, 2000 Share Posted August 22, 2000 This is a common problem with 45dcoe (but rarely 40dcoe) carbs and it by no means affects only Zetecs. The usual effect is that you have a flat spot on very light throttle which can make the car unpleasant to live with. Basically, the engine is being under-fuelled at this point. There are two possible cures:- 1)Fit special butterflies with a slot machined in them near the progression holes - these are no longer available, but you could machine your own. 2)Machine an extra progression hole into each barrel. This does really need to be done on a jig with the carbs off the car. It is generally effective at reducing the problem, but you should also make sure that your jetting (slow run jets) is correct for the application too. Link to comment Share on other sites More sharing options...
Andrew Dent Posted August 23, 2000 Share Posted August 23, 2000 Roger, At long last you are no longer a novice! About time too. Andrew Link to comment Share on other sites More sharing options...
I.Mupferit Posted August 23, 2000 Share Posted August 23, 2000 Raceline web address is www.raceline.co.uk They should certainly be able to help. Brent Link to comment Share on other sites More sharing options...
John Hartley Posted August 30, 2000 Author Share Posted August 30, 2000 Thanks for your comments. To someones question, the car is a US spec. Zetec and had the stock injection system. I called Weber UK and got the specs. on adding two more holes. By my measurements, they need to different. I am learning quite a bit about this subject and if anyone has a similar problem, I would be glad to share what I have learned. Link to comment Share on other sites More sharing options...
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