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Reply to "Puma with 2110"

I think there was a very good technical/engineering reason compression ratios precipitously dropped in the 1970s, but I don't have any idea what that reason was.

I also think there's probably a good technical/engineering reason compression ratios have gone up over the past 30 years, and that reason probably has a lot to do with volumetric efficiency, combustion efficiency and, well, torque.

I also think advances in combustion chamber design, better understanding what the flame front does and how to control it, made those higher CRs (Good LOrd, 10 to 1 static CR plus 15 lbs of boost?? In an econobox?) conceivable, but huge advances in computerized engine management systems and variable cam profiles made them practical. 

With that understanding, it's theoretically possible to build a Type 1 engine to 10+ CR and turbo it AND have it last a long time. All you would need is like 8 knock sensors, Some kind of variocam system on your rocker arms, special heads, EFI and crankfire ignition (of course)... And probably a new kind of case with five main bearings and a special crank to go with it. 

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