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  #166 (permalink)  
Old 12-31-2012, 03:24 PM
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well measured with a dial caliper and got .041-.044 on all cylinders. The machinest looked in the book and that would give me just under 9:5compression with a 59cc head. Not really sure which way I will go just yet.

The machinest says it will be fine and run it as it is.

If I knew for sure I could handle building the short block I would take it apart, get it decked for 100 bucks put it back together and be done with it. I dont want over 9:8 compression though. Im already at 9:5 with them .042.

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  #167 (permalink)  
Old 12-31-2012, 04:10 PM
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Originally Posted by 0trbo4myCHEVUICK View Post
well measured with a dial caliper and got .041-.044 on all cylinders. The machinest looked in the book and that would give me just under 9:5compression with a 59cc head. Not really sure which way I will go just yet.

The machinest says it will be fine and run it as it is.

If I knew for sure I could handle building the short block I would take it apart, get it decked for 100 bucks put it back together and be done with it. I dont want over 9:8 compression though. Im already at 9:5 with them .042.
Maybe I'm being overly simplistic when I say you have two choices......

A. Do it right.
B. Don't do it right.

Any hot rodder who knows what he's talking about will tell you that you'll be better off with a higher SCR and a tight squish than you will with a lower SCR and a wider squish.

This blurb is from Chevy High Performance magazine, but you can find the same verbage coming from any knowledgable engine builder.......

"So what are the benefits of all this squishing and quenching? The benefits are small, but often important. Pump-gas engines that run on the ragged edge of detonation, for example, can greatly benefit from a tighter piston-to-head clearance to reduce rattle. That sounds contradictory since increasing compression should lead to increased detonation. All the engine builders we spoke to mentioned that tightening the quench (reducing the piston-to-head clearance) to get it under 0.050 inch will increase the static-compression ratio, but this tighter clearance also creates a more powerful squish effect. This additional turbulence creates a more homogenous “soup” in the chamber, reducing the harmful effects of lean air/fuel ratio pockets. With all other variables being equal, this contributes to creating an engine that is less prone to detonation."
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  #168 (permalink)  
Old 12-31-2012, 04:29 PM
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pretty sure im going to be tearing the short block down and decking it... The 425$short block just became 525$ assembly required :/
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