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Old 09-28-2019, 02:37 AM   #389 (permalink)
Join Date: Aug 2008
Location: Everett WA
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Originally Posted by JSH View Post
Production gasoline cars are running 14:1 compression ratios these days. That is getting pretty close to the 16.5:1 in my Jetta TDI. Also the higher the compression ratio the harder it is to meet emission standards.
Fifty+ years ago, jet engines had the same problems, as they tried to raise burner can temperatures for better efficiencies.
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