Carburetor jetting, Recommended base line jets for Weber 40s |
|
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. |
|
Carburetor jetting, Recommended base line jets for Weber 40s |
Slanski62 |
Jan 10 2017, 11:14 PM
Post
#1
|
Newbie Group: Members Posts: 2 Joined: 22-October 16 From: Chapel Hill, NC Member No.: 20,520 Region Association: South East States |
Hello. I'm new to the forums here but have been reading and learning a lot. Thank you.
I have a pair of Weber 40s I plan to use on a 2056 I'm building. The carbs are used, and I don't know how they're jetted. Can anyone recommend a base line? I'm at an altitude of 486 feet. I appreciate any suggestions! Steve |
amfab |
Jan 12 2017, 10:37 AM
Post
#2
|
Member Group: Members Posts: 401 Joined: 17-May 16 From: Los Angeles Member No.: 20,004 Region Association: None |
I have a set of IDF 36s with 32 venturis
It has 47 idles, and 145 mains with 220 AC, It pops a lot, especially when cold on decel, and the transition isn't too smooth. Should I bump up the jet sizes a little ? ' 74 2.0 unknown cam—i assume stock. TIA -Andrew |
stugray |
Jan 12 2017, 11:03 AM
Post
#3
|
Advanced Member Group: Members Posts: 3,825 Joined: 17-September 09 From: Longmont, CO Member No.: 10,819 Region Association: None |
I have a set of IDF 36s with 32 venturis It has 47 idles, and 145 mains with 220 AC, It pops a lot, especially when cold on decel, and the transition isn't too smooth. Should I bump up the jet sizes a little ? ' 74 2.0 unknown cam—i assume stock. TIA -Andrew Look for manifold leaks |
porschetub |
Jan 12 2017, 03:58 PM
Post
#4
|
Advanced Member Group: Members Posts: 4,725 Joined: 25-July 15 From: New Zealand Member No.: 18,995 Region Association: None |
I have a set of IDF 36s with 32 venturis It has 47 idles, and 145 mains with 220 AC, It pops a lot, especially when cold on decel, and the transition isn't too smooth. Should I bump up the jet sizes a little ? ' 74 2.0 unknown cam—i assume stock. TIA -Andrew Look for manifold leaks X2 on that ,many of the manifold kits come with thick paper gaskets that settle after time and leak,I would increase the idle jets to #55 seems to be the sweet spot for Webers,Dellorto's and the Zeniths used on the 911. If your transition is still poor try dropping your mains down after going to the bigger idles,those mains you are using are a bit "fat" ,I would think 130-135 would be better with the vents you have,good luck. |
Lo-Fi Version | Time is now: 25th September 2024 - 10:41 PM |
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 ... |