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Carb question
Posted: Fri Jul 17, 2020 7:17 am
by fredc125
If I run to small main jets can this damage my engine or just reduce output? (IDF 44's, 135 mains, 2413cc eng.) I will get new mains but in the meantime is it safe?
Re: Carb question
Posted: Fri Jul 17, 2020 12:57 pm
by Deefer66
If it runs too lean it can heat up the heads..
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Re: Carb question
Posted: Fri Jul 17, 2020 5:34 pm
by NextGen
Also a sign is if you accellerate from 0 through the gears and car dies on top end, the main is too small.
By just dropping to 125 from 130 my bug just lost power on top end. I did notice from going from 135 down to 130 the car ran hotter but not danger hot. SO it has been a 130 for years. Less unburnd gas smell and car runs great.
Re: Carb question
Posted: Fri Jul 17, 2020 5:38 pm
by twodollardoug
An air/fuel ratio meter is the best tool for jetting. Unless you have a good knowledge of reading plugs.
Re: Carb question
Posted: Fri Jul 17, 2020 5:44 pm
by twodollardoug
I try to jet for 13.5 a/f for my mains. Any lower and your wasting fuel. Any higher, temps and combustion chamber pressure goes up. Small aircraft pilots are the masters on a/f ratios. They adjust their a/f on the "fly". LOL