The ALL Florida Online Corvette Club - View Single Post - block decked .010 how much diferance in compression ratio

grumpyvette · 04-15-2009, 05:51 PM

OK youve decked the block .010 durring the block machining process , how did that change the compression?

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/e...tio/index.html

http://www.circletrack.com/techartic...ion/index.html

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

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

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

04-15-2009, 05:51 PM	#1
grumpyvette retired mech engineer Join Date: Sep 2007 Location: florida Posts: 159 Name :	block decked .010 how much diferance in compression ratio OK youve decked the block .010 durring the block machining process , how did that change the compression? 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/e...tio/index.html http://www.circletrack.com/techartic...ion/index.html http://forum.grumpysperformance.com/...hp?f=86&t=1330 http://forum.grumpysperformance.com/...php?f=52&t=727 http://forum.grumpysperformance.com/...php?f=53&t=726