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Discussion Starter · #1 ·
I am looking for some insight into how much tempature will affect a good tune. Been running a 500" BBC with 14:1 comp on a 275 tune with a big shot. 7 degrees out and 6lbs flowing on C16 with 3932 plugs. Tune up looks good and has worked well up to now. With the colder weather setting in What should I be doing to safe gaurd the motor? Been racing in 75-85 degrees and now its into the low 60's at night.
 

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You will find most weather stations do not just use temperature but use it with barometric pressure, elevation and humidity, they all play into air density.
The biggest thing we find with the cool night is the track bite going away if the dew rolls in.
 

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Couple different ways to attack that. Personally, I jet the carb(s) up, everything else being equal. Timing and system fuel pressure can also be adjusted. If you are using stock NOS jet pattern, you are probably fat already though.
 

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Discussion Starter · #4 ·
Yes, it is their stock pattern. Plugs look good with a scope but have never cut them.
 
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