Help with Dynamic Compression Ratio
This is what I come up with for my motor. Should I increase the gasket thickness?
Inputs Outputs
Cylinder Head Volume (cc) 64 Cylinder Head Vol 3.904
Piston Head Volume (cc) 0 Piston Head Vol 0
Gasket Thickness (in.) 0.043 Swept Volume 35.058
Gasket Bore (in.) 4 T.D.C. Volume 4.325
Cylinder Bore Diameter (in.)3.9 Gasket Volume 0.054
Deck Clearance (in.) -0.1 Deck Volume -0.119
DST 2.934 Dynamic COMPR RATIO 9.106
Inputs Outputs
Cylinder Head Volume (cc) 64 Cylinder Head Vol 3.904
Piston Head Volume (cc) 0 Piston Head Vol 0
Gasket Thickness (in.) 0.043 Swept Volume 35.058
Gasket Bore (in.) 4 T.D.C. Volume 4.325
Cylinder Bore Diameter (in.)3.9 Gasket Volume 0.054
Deck Clearance (in.) -0.1 Deck Volume -0.119
DST 2.934 Dynamic COMPR RATIO 9.106
Quench of .035 - .040 is pretty good. You're numbers show 0 deck, and the piston 0 out of the hole with a .043 gasket. So, that'd be .043 quench which should be fine.
My question, is this a stock motor or not. If so, your numbers are off. I have it in a spreadsheet you play with. SCR/DCR, header length, etc...
http://users3.ev1.net/~black_ops/cam...calculator.xls
This is my quick and dirty VE calculator sheet with a few add ons:
Sheet 1 - compare two cams (forum post) this was an attempt to put _ in there to keep the spacing right on when posting specs on the forum. I have found a better way now is to use a fixed width font like courier which does the same thing without all the ___. This sheet compares two cams side by side so you can see how they stack up.
Sheet 2 - Compare 4 cams. No underscores in this one. It simply compares 4 cams instead of 2.
Sheet 3 - VE's. Shows where 93 pony was putting a lot of his cams compared to other folks. This was realy there as a reference for me when looking over some cams.
Sheet 4 - Single Cam. Valve Events for one cam.
Sheet 5 - Compare two cams. Compare the valve events, etc... for two cams.
Sheet 6 - Quick and Dirty Cam/SCR/DCR Calculator Spreadsheet. This sheet takes all the cam math and combines it with a bunch of other engine math like DCR and SCR, along with header length math to help you in optimizing your combo, or to give you the details on your combo.
Sheet 7 - Compare DCR. This allows you to compare two motor combos to look at Valve events, dynamic compression ratio, and header length and see where you want to be, or what you're going to end up at with a change...
My question, is this a stock motor or not. If so, your numbers are off. I have it in a spreadsheet you play with. SCR/DCR, header length, etc...
http://users3.ev1.net/~black_ops/cam...calculator.xls
This is my quick and dirty VE calculator sheet with a few add ons:
Sheet 1 - compare two cams (forum post) this was an attempt to put _ in there to keep the spacing right on when posting specs on the forum. I have found a better way now is to use a fixed width font like courier which does the same thing without all the ___. This sheet compares two cams side by side so you can see how they stack up.
Sheet 2 - Compare 4 cams. No underscores in this one. It simply compares 4 cams instead of 2.
Sheet 3 - VE's. Shows where 93 pony was putting a lot of his cams compared to other folks. This was realy there as a reference for me when looking over some cams.
Sheet 4 - Single Cam. Valve Events for one cam.
Sheet 5 - Compare two cams. Compare the valve events, etc... for two cams.
Sheet 6 - Quick and Dirty Cam/SCR/DCR Calculator Spreadsheet. This sheet takes all the cam math and combines it with a bunch of other engine math like DCR and SCR, along with header length math to help you in optimizing your combo, or to give you the details on your combo.
Sheet 7 - Compare DCR. This allows you to compare two motor combos to look at Valve events, dynamic compression ratio, and header length and see where you want to be, or what you're going to end up at with a change...
Thanks J-rod,
I come up with slightly different numbers using your calcs,
10.79 static and 8.61 Dynamic.
Yep stock bottom end with stock LS6 ported livernois heads.
I have flat top pistons that are out of the hole .010, so my quench is .033.
I like your numbers better.
I come up with slightly different numbers using your calcs,
10.79 static and 8.61 Dynamic.
Yep stock bottom end with stock LS6 ported livernois heads.
I have flat top pistons that are out of the hole .010, so my quench is .033.
I like your numbers better.
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