size jets for zenith carbs

[Pierre Ducroit]

hello,i need you help,could someone help me wit the size of the jets zenith carbs need with modern gas at 7,000 feet above seal level?
i would aprreciate your comments.
thanks for your help in advance.
Pierre.
PS: my engine is 1600 s 1959

[Norm Miller]

Pierre,

If you live at 7000' the only change would a step larger for the air correction jet.
Installing smaller venturi could boost low end performance.
You can advance the ignition timing without detonation.

The loss of power is not recoverable except for pressurized induction.


Norm

[Pierre Ducroit]

thanks for the prompt reply Norm,my question is what size of jets do i need?
thanks for the reply.
regards

[David Jones]

This will help Pierre and these folks can supply the correct jets for your car. Get in touch with them and they will see that you get the jets that you need.
http://www.356carburetorrescue.com/carburetorspecs.html

[John Jenkins]

I lived in Colorado at 6000 feet for 14 years. I went from 130's (1600S spec) to 120's. The rule from Porsche is reduce .05 for every 3000 feet. If your displacement is 1720 you could go to 115's. I kept it a little rich because I was not always at 6000 feet. Always check your plugs to make sure you are not running too lean. If fact, I carried 125's and 130's so I could change jets to match my altitude because I drove all over the country while I lived there. I did not have to change the air correction jets.

[Pierre Ducroit]

thanks for all your comments.will try to find out what jets i have,cause i tought the jets where the ones that where just near the venturi and could be seen when taking off the air filter.Seems like im real dump.