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smartineau
04-05-2008, 11:49 AM
What is the best compression ratio for a cng engine?
Stan
neongreen
04-05-2008, 09:50 PM
I can't say authoritatively but I hear it's about 12:1-14:1.
Ben
04-14-2008, 02:30 PM
Stan,

Does this help?

Ben
j03j03
04-14-2008, 05:19 PM
It depends on: kind of engine, size, company, all kinds of things.
mrpsycho1
04-29-2008, 01:06 AM
For what it's worth... The 2008 Honda GX engine is made for CNG. This engine has a compression ratio of 12.5:1. 12.5 to 13 is pretty safe, but I don't think there would be much benefit from more. I could be wrong...:o BTW... most modern engines designed for pump gas (87) are as low as 8.5:1 to 10.5:1 on the high side.