Rob008 Posted June 1, 2017 Posted June 1, 2017 Gathering some info on these and wanted to know if anyone has purchased or used these carbs for an L28? Which one is better for street and some track days, 3, 4, or 5 stage??? Is there any difference from the reproduction Weber carbs? (Like new ones from redline for example) or better rebuilding original old ones?? Quote
AndBir Posted June 1, 2017 Posted June 1, 2017 The write up here indicates 4 stage is better than 3 stage but no mention of 5 stage. Quote
Rob008 Posted June 1, 2017 Author Posted June 1, 2017 Read that it suppose to be smoother. Wanted to know if people have experience with these.... surely more would be better?? Didn't know if that there was 5 either until I stumbled across this Quote
Rob008 Posted June 1, 2017 Author Posted June 1, 2017 http://online.redlineauto.com.au/products/product/19600-06201?category=NJHAJDMK& Quote
Roady Posted June 1, 2017 Posted June 1, 2017 (edited) These Weber carbs with 3 Progression holes are not as smooth transition as 4+ hole. I have a 3 Progression Weber DCOE, and it can be driven and used normally but the butterfly does not sit directly under the first hole. You can richen up the idle jet as I have done and it drives normally with no issues except you will use more fuel due to the richer idle jet. Also when you are driving at low constant rpm it can run lean as it has not exposed the first Progression Hole. Am looking at drilling a 4th hole in mine but this project is temporarily on hold... Hope this helps Edited June 1, 2017 by Roady Quote
Administrators gav240z Posted June 1, 2017 Administrators Posted June 1, 2017 What fuel pump do you recommend?? On carbs like weber / mikuni generally a pump that produces 3-4 psi of pressure coupled with a fuel pressure regulator. I believe the standard mechanical pump is capable of this but I've yet to test it fully. Quote
Roady Posted June 1, 2017 Posted June 1, 2017 (edited) When I threw a fuel pressure gauge on the standard mechanical pump Gav mine was showing about 3psi. Obviously the age of the mechanical pump would probably affect its output. I use a carter p4070 - which has a high volume output at relatively low pressure (4-6psi)... they sometimes advertise it as not requiring a pressure regulator but as previously mentioned you generally want around 2.5-3psi for webers. I use a holly pressure regulator - can't remember the part number sorry, but I'm sure google will answer all if you search. Have run this set up for many years now and never had an issue except my crap/cheap fuel pressure gauge breaking. Good luck Edited June 1, 2017 by Roady gav240z 1 Quote
Agno Posted June 2, 2017 Posted June 2, 2017 I would highly recommend the Pierburg pump available at EFI hardware. It's quieter than a Carter pump, cheaper and out of the box pumps 2.7psi. https://www.efihardware.com/products/261/lift-pump-340hp-Rollercell gav240z 1 Quote
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.