cng engine compression

[smartineau Member Find all posts View Profile Close smartineau]

What is the best compression ratio for a cng engine?
Stan

[neongreen Member Find all posts View Profile Close neongreen]

Re: cng engine compression

I can't say authoritatively but I hear it's about 12:1-14:1.

[Ben Member Find all posts View Profile Close Ben]

Re: cng engine compression

Stan,

Does this help?

Ben

[j03j03 Member Find all posts View Profile Close j03j03]

Re: cng engine compression

It depends on: kind of engine, size, company, all kinds of things.

[mrpsycho1 Member Find all posts View Profile Close mrpsycho1]

Re: cng engine compression

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... BTW... most modern engines designed for pump gas (87) are as low as 8.5:1 to 10.5:1 on the high side.