Thread: Need Help with tuning Webers
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Old 03-19-2007, 08:04 PM
traindriver traindriver is offline
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Join Date: Dec 2002
Location: Brookfield, WI
Cobra Make, Engine: SPF #1591 / Perf.Eng. 351W/48IDAs
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Default exhaust jets
EntDoc

The exhaust jet is a bypass jet, basically in parallel with the pump jet. It's the only gas jet in the IDA where the SMALLER the number the MORE fuel is supplied. So a 050 (actually .50mm dia) puts more fuel thru the pump jet. Try a 055 to reduce the pump shot a bit. For those with lots of $$ and patience..you can play with the pump jet along with the exhaust jet (aka drain jet) to affect the shot volume and duration..the exhaust jet mainly affects the volume of the shot whereas the pump jet mainly affects the duration. I haven't ventured there yet.

Chuck
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