how did decking the block effect cpr

grumpyvette

grumpyvette

Administrator
Staff member
OK youve decked the block .010 durring the block machining process , how did that change the compression?
hrdp_0704_59_z+piston_TDC_diagram+.jpg

if you decked the block .010 youve effectively moved the piston .010 closer to the cylinder heads unless the head gasket is selected to be .010 thicker to compensate
I don,t know the bore dia. but lets assume in a calculation its 4" bore

cutting a deck on a block and not compensating with a thicker head gasket on that 4" bore had about a 2 cc reduction in the total area over the piston being compressed, into the combustion chamber above it, simply because the area of the bore times the depth of the cylinder results in that volume
formula

bore radias sq x 3.147 x .010 x 16.39(changes cubic inches to CCs)

(referance you need TO COMPLETE THE CALCS)

http://www.hotrod.com/techarticles/engine/how_to_calculate_compression_ratio/index.html

http://www.circletrack.com/techarticles/ctrp_0505_calculating_engine_compression/index.html

http://forum.grumpysperformance.com/viewtopic.php?f=86&t=1330

http://forum.grumpysperformance.com/viewtopic.php?f=52&t=727

http://forum.grumpysperformance.com/viewtopic.php?f=53&t=726
 
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