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What sized jets should I be using? 

 

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 Post subject: What sized jets should I be using?
Posted: Wed Aug 16, 2006 6:37 pm 
Getting Side Ways
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Im running a 750 street performer on my 351 and it isw running too rich

What i am wondering is what kind of jets should i start with to jet it down?
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Posted: Wed Aug 23, 2006 11:28 pm 
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what size jets do you have? What are the specs on the camshaft also? Is the engine a stock rebuild? If so? The carb is too big.

Generally you run 72's in the primaries and 80's in the secondary side. The holley website will verify the stock jet sizes if you look up the part no on there.

 

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 Post subject: Re: What sized jets should I be using?
Posted: Thu Aug 24, 2006 12:42 am 
Getting Side Ways
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VIC, Australia

xf_man wrote:
Im running a 750 street performer on my 351 and it isw running too rich

What i am wondering is what kind of jets should i start with to jet it down?


Hi

save yourself a lot of headaches and have it run on a chassis dyno with a high speed A/F ratio meter like a altronics or motec and a few other good brands of meters.

Spend the money its worth the result , and if you do decided to use a dyno shop make sure you have the gaskets and a hand full of different jet sizes with you , as dyno time is not cheap.

Depends what you budget is like , might be a good idea to invest in a High speed A/F ratio meter like the handheld portable innovator LM-1 digital Air/Fuel Ratio Meter and Datalogger http://www.innovatemotorsports.com/products.php this unit retails about $550 depending whom you buy it from.

http://www.airfuelmeter.com/english/

http://www.motec.com.au/index.htm

What is recommend via a chart that reads engine size and rpm and horse power out put does not necessarily mean that will work.

it is a guide , never had a carburetor out of a box jetted right straight of nor even carbys built by carby guys jetted supposedly for a specific engine combo right either.

If you don't want to spend the money to run the car on a chassis dyno , you will have to remove the fuel bowls and see what jets sizes are in the carburetor if you don't know it's history.

there are other adjustments to consider also.

cheers

 

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