[DeTomaso] Optimal Air Fuel Ratio Question

Paul - Home thedrol at pobox.com
Wed Jun 3 19:54:49 EDT 2009


You mean 0.0946" diameter main jet, right?

Paul
#9270

Daniel C Jones wrote:
>> Does anyone have a table or chart handy showing how many Holley jet sizes you should change per 1000ft of elevation change?
>>
>> Doug Braun
> 
> Do a search on Air Density Ratio Charts. At high altitudes (actually at any
> altitude above 0' msl.), the diameter of the main jets varies proportionally
> with the fourth root of the air density ratio at a particular altitude
> in order to
> maintain a constant mixture ratio at that altitude.  For instance, if Holley
> used a .100" diameter main jet for a standard (sea level) setting, and your
> local density ratio is .8, you should use a .946" diameter main jet in order
> to maintain the correct mixture ratio.
> 
> Dan Jones
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