 Relationship between idle jets and idle mix screws |
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| era vulgaris |
 May 9 2016, 04:06 PM
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J is for Genius  Group: Members Posts: 983 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? |
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| r_towle |
May 10 2016, 11:05 PM
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Custom Member Group: Members Posts: 24,705 Joined: 9-January 03 From: Taxachusetts Member No.: 124 Region Association: North East States 
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Ok,
Sounds like a great car that runs perfectly fine. What are you bitching about? Just drive it.... (IMG:style_emoticons/default/smile.gif) I realized today that my 911 was not nearly as smooth as my big Audi. Oh, my 911 is over 30 years old and the Audi is less than ten.... My 914 was never without hiccups....just goes with the territory. |
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Posts in this topic
era vulgaris Relationship between idle jets and idle mix screws May 9 2016, 04:06 PM
Justinp71 On all the carbs I've worked on the idle screw... May 9 2016, 04:27 PM r_towle First answer, no, it does not work that way.
Then,... May 9 2016, 05:41 PM era vulgaris Thanks for the info guys!
I already have an o... May 9 2016, 06:23 PM rhodyguy At what rpm does your car idle? Does your car stil... May 9 2016, 06:40 PM era vulgaris It idles around 1100.
Yeah I normally roll up to... May 9 2016, 06:47 PM
rfinegan
It idles around 1100.
Yeah I normally roll up t... May 10 2016, 04:35 AM somd914 This doesn't answer your question but there is... May 9 2016, 07:00 PM PancakePorsche After 3-4 turns out, idle mixture screws are not ... May 10 2016, 12:21 AM rhodyguy See if you can achieve a stable idle @ 950rpm. May 10 2016, 07:15 AM era vulgaris
After 3-4 turns out, idle mixture screws are not... May 10 2016, 07:42 AM Justinp71 Yes, AFR gauges are great.
Also make sure you don... May 10 2016, 04:05 PM r_towle Talking about heat syncing and how it affects the ... May 10 2016, 04:13 PM era vulgaris I do have phenolic spacers between the heads and t... May 10 2016, 04:40 PM r_towle I saw the thread, was not blind, just bored stiff ... May 10 2016, 07:25 PM era vulgaris Sorry, the missed thread comment was directed at J... May 10 2016, 09:37 PM era vulgaris Haha, yeah you're probably right. And if this... May 11 2016, 07:48 AM r_towle Thus why I have no gauges in mine....I took out th... May 11 2016, 07:45 PM |
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