I have a really bad off idle problem with my 152 dcoe 45''s and read on another forum that it is possible to drill a 4th progression hole , converting them to 152g carbs to relieve the problem. Has anyone done this or seen it done? What were the results.
Yes I have done this. Makes a difference. Not all that hard, but you need to be precise, and meticulous. Info here: http://www.alfabb.com/bb/forums/car...-45dcoe-progression-circuit-modification.html
The 152's on sale (cheap) new seem to have extra progression holes. (ebay) You can always block them back off Honestly never had a big progression issue. Are you sure you have near right idle and main circuit jets? Likewise, is it running cleanly on 4 cyls during the transition? My dash lambda reader is useful on the mk2 rallycar. Bounces end-end at idle (slightly lean), then pullsm into the green zone on main jet. (luminition) 100 well spent IMHO Jon
I ended up removing the carbs and bought a set of 152g 4 hole carbs and swapped the jets , rebalanced the carbs and the problem was solved. I contacted a company here, bccp fuel systems , to ask about re-drilling the carbs but they were not too keen on the idea and made it very clear that this can go wrong so its done at your own risk..........so i just bought the 152g carbs. Runs now like a scalded cat, but needs bigger cams to get the best from the diesel crank.
