 Carb throat balance when tuning now a rebuild saga !, those with Zenith carbs can learn from my bad fortune ? |
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| porschetub |
 Aug 29 2023, 11:25 PM
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Advanced Member  Group: Members Posts: 4,706 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 |
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| nditiz1 |
Aug 30 2023, 09:18 AM
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Senior Member Group: Members Posts: 1,191 Joined: 26-May 15 From: Mount Airy, Maryland Member No.: 18,763 Region Association: MidAtlantic Region 
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It's not an issue to tune them at idle. You want to make sure they are close. If 1 is bouncing between 5.25 and 5.75 your middle ground is 5.5 make sure the other 6 are around there too. If one is bouncing around 5.3 and 5.8, that's close enough.
The main think is getting the linkage set once they are all relatively balanced. Checking at different RPMs to ensure both open and close as one through the range. Also, you want to make sure you are getting to WOT. So many carbs have be tuned without ever checking and people wonder why their car is under powered. |
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Posts in this topic
porschetub Carb throat balance when tuning now a rebuild saga ! Aug 29 2023, 11:25 PM
IronHillRestorations You tune the mixture at 1800. Idle speed should be... Aug 30 2023, 06:07 AM rhodyguy Like Perry said. Turning the idle up settles the n... Aug 30 2023, 07:46 AM porschetub Thanks for all the replies and sorry for the delay... Sep 3 2023, 05:51 PM
Retroracer
Thanks for all the replies and sorry for the dela... Sep 4 2023, 09:32 AM porschetub Thanks for the reply Tony,my carbs are euro spec s... Sep 4 2023, 05:55 PM porschetub
Thanks for the reply Tony,my carbs are euro spec ... Sep 9 2023, 01:35 PM porschetub Currently working in the engine bay doing a tidy u... Oct 25 2023, 04:23 PM rgalla9146 Be certain your timing is correct, advance is work... Oct 26 2023, 07:18 AM porschetub
Be certain your timing is correct, advance is wor... Oct 26 2023, 01:12 PM porschetub
[quote name='rgalla9146' post='3109820' date='Oct... Oct 31 2023, 04:40 PM Dion Well done Dean, will be like new! Glad you fou... Oct 31 2023, 04:59 PM porschetub
Well done Dean, will be like new! Glad you fo... Nov 5 2023, 06:08 PM porschetub
Well done Dean, will be like new! Glad you f... Nov 8 2023, 04:09 PM porschetub Well appears my carb rebuild is a slippery slope w... Nov 17 2023, 10:40 PM porschetub
Well appears my carb rebuild is a slippery slope ... Nov 27 2023, 01:41 PM porschetub Both carbs back on after checking for delivery wit... Dec 6 2023, 09:43 PM porschetub No luck today ,used to tune these carbs easily but... Dec 8 2023, 04:37 PM porschetub No luck today ,used to tune these carbs easily but... Dec 8 2023, 04:39 PM |
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