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It seems like the rules for compression are pretty solid, with 128 being the low and a max of 10% difference between cylinders. First - is there agreement with these numbers? Secondly, I found some two year old data that said leakdown values indicated this (from Ed (Toronto)):
3% - 5% good racing engine
5% - 7% good street engine
10% weak
20% shot and 3 year old data from AzHeat (was Mike(Phoenix)) that indicated this:
A strong motor will have 2% -10% leak down. Anything over 15% is queastionable. More of the same from BadZCar(FL) who said that anything OVER 13% leakdown was bad. So in one corner, we have an argument suggesting that, for example 10% leakdown is weak, but ok, while in the other corner we show that 10% leakdown is a "strong" motor, with some gray area to 15%, and over 15% being questionable. With technology as it is today, and more data to add to the stock pile, is there any new concensus, if you will, to add to these figures? If 10% is 'ok', what does 11, or 12% mean? As it gets more gray, what is the indication of ring damage? Can a motor 'in the gray' operate for a year? two years? forever? I'm attempting to quantify, if at all possible. Thanks for any insight. SS
____________________________________________________________________________________________________ You bark like a big dog, yet you pee like a little puppy. 
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