Carb throat balance when tuning now a rebuild saga !, those with Zenith carbs can learn from my bad fortune ? |
|
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. |
|
Carb throat balance when tuning now a rebuild saga !, those with Zenith carbs can learn from my bad fortune ? |
porschetub |
Aug 29 2023, 11:25 PM
Post
#1
|
Advanced Member Group: Members Posts: 4,703 Joined: 25-July 15 From: New Zealand Member No.: 18,995 Region Association: None |
Doing a tune on my Zeniths ,cant find an exact rpm range and done a ton of research ;
Bruce Anderson mentioned 1800 in his book, Factory says 1000 in the gary.suggate site factory manual, Haynes manual tells us 1000. So far I have tuned throats @ idle ,1000rpm ,1400 and 1800 on hand throttle and strangely I get the same balance any way ?. Now thinking its not an issue but would appreciate feedback from 6yl guys with carbs,TIA,cheers |
porschetub |
Dec 8 2023, 04:37 PM
Post
#2
|
Advanced Member Group: Members Posts: 4,703 Joined: 25-July 15 From: New Zealand Member No.: 18,995 Region Association: None |
No luck today ,used to tune these carbs easily but not in this case anymore ,no response from tip in throttle ( idle ) or air bleeds so can't get the timing spot on ,timing isn't the issue but leaking mixture screws are, most I removed had air past leaking the 'o 'rings so OD is too small.
The air bleed screws weren't working as the idle screws were already doing that in spades (IMG:style_emoticons/default/sad.gif) , have more "o"rings that were in the kit perhaps they are the right ones so may have fitted the wrong ones but being so small they are almost impossible to measure them or compare with the old ones as they were toast . These are the worst to fit due to how they go on ,you need to be super careful as they pass on to the mounting thread then into a recess then into the correct groove ,they can't be too large otherwise the spring won't go on. Will update as I hopefully move forward but after some measurement not 100% sure this will sort it ? my gut feeling on my vacuum loss is it maybe something else any suggestions would be a huge help , TIA and (IMG:style_emoticons/default/beer.gif) . |
Lo-Fi Version | Time is now: 2nd June 2024 - 12:57 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 ... |