Relationship between idle jets and idle mix screws |
|
Porsche, and the Porsche crest are registered trademarks of Dr. Ing. h.c. F. Porsche AG.
This site is not affiliated with Porsche in any way. Its only purpose is to provide an online forum for car enthusiasts. All other trademarks are property of their respective owners. |
|
Relationship between idle jets and idle mix screws |
era vulgaris |
May 9 2016, 04:06 PM
Post
#1
|
J is for Genius Group: Members Posts: 982 Joined: 10-November 13 From: Raleigh, NC Member No.: 16,629 Region Association: South East States |
How much can one compensate for the other?
For example, with larger jets and idle screws further in, could you tune a set of carbs identically to another set of the same carbs that had smaller jets with the mix screw further out? I want to experiment with going a little leaner at idle and seeing how my engine likes it. I'm trying to decide if I should order a smaller set of idle jets or if I can achieve the same result by just turning the screws in further. Basically, what is the difference? Don't they achieve the same ends? Obviously there's a limit on the rich side because there's only so much fuel a jet will allow to flow. But if you're trying to lean it out, what's the difference between going to a smaller jet or just turning in the screw? |
r_towle |
May 10 2016, 04:13 PM
Post
#2
|
Custom Member Group: Members Posts: 24,585 Joined: 9-January 03 From: Taxachusetts Member No.: 124 Region Association: North East States |
Talking about heat syncing and how it affects the mechanicals of a carb, as well as the fuel density....
Do you have phenolic spacers between the heads and the intake manifolds? Do you have phenolic spacers between the intake manifolds and the heads? When you get this issue to happen on the second or third time you have driven the car, please reach in and see if you can grab the side of the carb....without burning yrself. See how hot the manifolds are and how hot the carbs are. Also, please look at fuel lines, fuel pump and feel the heat if you can when this condition happens. Rich |
Lo-Fi Version | Time is now: 2nd June 2024 - 07:03 AM |
All rights reserved 914World.com © since 2002 |
914World.com is the fastest growing online 914 community! We have it all, classifieds, events, forums, vendors, parts, autocross, racing, technical articles, events calendar, newsletter, restoration, gallery, archives, history and more for your Porsche 914 ... |