I agree it's NOT an ideal situation, but I think saying that it will break the crankshaft is a bit dramatic!
The weight of the pistons (should be equal) is MUCH more important than individual cylinder compression.
And he did NOT post the weights of the pistons he used. Even though the CR is different the WEIGHT of the pistons MAY be the same... or NOT!
The other factor would be if the higher-compression cylinder pre-ignites with the gas being used and the load on the engine.
About 20 years ago I got an SBC Chevy 350 block from a machinist friend that had 2 cylinders bored .060" OS, and the other six standard.
We put it together with 6 OEM pistons and 2 aftermarket OS pistons. We weighed them and all 8 were darned close in weight even with the different size and manufacturer.
Some "experts" said it would shake like a *@&#^$%. Others said it would be OK.
It was. It runs about as smooth as any other run-of-the-mill SBC.
I still have the old pickup and it still runs.
(NOT saying what we did is good practice or that the engine is as smooth as a "blueprinted engine", but it did work OK for our non-racing purpose!)
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Today's Featured Article - Hydraulic Basics - Part 2 - by Curtis Von Fange. In the last entry to this series we gave a brief overview of hydraulic system theory, its basic components and how it works. Now lets take a look at some general maintenance tips that will keep our system operating to its fullest potential. The two biggest enemies to a hydraulic system are dirt and water. Dirt can score the insides of cylinders, spool valves and pumps. Wate
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