Why do fuel injected engines run cooler?

Mattio

Mattio

Well-Known Member
In my reading and preparation of a presentation on aircraft systems, I read that fuel injected engines tend to run cooler than their carbureted equivalents but couldn't figure out why. Do you guys know why this is?
 
ghoster said:
it has been my experience that it is because of better fuel balance and metering.

JMHO
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Think about what happens to the EGT's when the enrichen or lean the mixture. The FI engine can distribute fuel more evenly than a carburetor can, therefore the A/F mixture is controlled better... temperatures are better.
 
Ok, so basically in a carbureted engine, sometimes some of the cylinders run leaner than you want them to when at full or close to full power producing a somewhat unacceptable temperature? (Thinking along the lines of leaned mixture burning hotter)

Thanks for the help, guys.
 
Actually, I was just looking through my trusty Jeppesen manual (which I previously disregarded and thought it would be too basic for my purposes) and it said the cooling is (at least in part) due to the vaporization of the fuel closer to the cylinders. Vaporization causes a temp drop and therefore cylinder temp drop according to them.
 
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