Compression Ratio

[Medicash]

Can someone please explain to me about Compression Ratio's and tell me their significance to engine rebuilding, many thanks Jerry

 

[Bob Chadwick]

Higher compression ratios generally mean more power. It can also cause pre-ignition detonation when the compression of the air fuel mixture is ignited by the heat caused by the compression rather than a spark.

Higher octane gases combat this but they are gradually going the way of the dodo bird.

Aluminum heads can allow for higher compression ratios with out pre-ignition knock.

I think cams, particularly those with large overlap, can impact pre-ignition but someone knowledgeable about this will have to give the specifics.

 

[6speeder]

http://www.chevyhiperformance.com/techarticles/46778/index.html