Calculating Compression Ratio?
Thread Starter
Staging Lane
Joined: Mar 2010
Posts: 69
Likes: 0
Calculating Compression Ratio? I have a ls1 that I'm using in a kit car. I bought some 243 heads to replace the stock 241's. So I know that will jump the compression by half a point. I'm thinking of trying to bump the compression closer to 11:1 without milling. I have found a .40 gasket but how do I calculate what compression ratio that will give me? If I can reuse stock 241 pushrods that would be awesoome.
I will be buying a cam also, somewhere around 228/228.
I will be buying a cam also, somewhere around 228/228.
With 64.45cc heads, 3.910" bore and 0.040" thick gaskets, stock 3.898" bore, stock 3.622" stroke, flat top pistons, 0.010" out of the hole yields you 11.07:1 compression ratio.
http://www.kb-silvolite.com/calc.php?action=comp
http://www.kb-silvolite.com/calc.php?action=comp
I have a ls1 that I'm using in a kit car. I bought some 243 heads to replace the stock 241's. So I know that will jump the compression by half a point. I'm thinking of trying to bump the compression closer to 11:1 without milling. I have found a .40 gasket but how do I calculate what compression ratio that will give me? If I can reuse stock 241 pushrods that would be awesoome.
I will be buying a cam also, somewhere around 228/228.
I will be buying a cam also, somewhere around 228/228.
0 if it is a flat top
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Hmm I guess we have different sources. Not to proclaim one is better than the other, but mine is only read. I will verify later this evening, just out of curiosity.
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Staging Lane
Joined: Mar 2010
Posts: 69
Likes: 0
Ok, so I entered
64.45 for Cylinder Head Volume
0 for Piston Head Volume
.40 Gasket Thickness
3.910 Gasket Bore
3.898 Cylinder Bore
Don't know for Deck Clearance
3.622 for Stroke
Rod length blank
Intake Closing point blank
Static Compression Ratio says 3.529
What am I missing. Sorry
I know for cylinder volume I do bore x bore x stroke gets cubic inchs then x .7854 for cubic centimeters.
64.45 for Cylinder Head Volume
0 for Piston Head Volume
.40 Gasket Thickness
3.910 Gasket Bore
3.898 Cylinder Bore
Don't know for Deck Clearance
3.622 for Stroke
Rod length blank
Intake Closing point blank
Static Compression Ratio says 3.529
What am I missing. Sorry
I know for cylinder volume I do bore x bore x stroke gets cubic inchs then x .7854 for cubic centimeters.
Ok, so I entered
64.45 for Cylinder Head Volume
0 for Piston Head Volume
.40 Gasket Thickness
3.910 Gasket Bore
3.898 Cylinder Bore
Don't know for Deck Clearance
3.622 for Stroke
Rod length blank
Intake Closing point blank
Static Compression Ratio says 3.529
What am I missing. Sorry
I know for cylinder volume I do bore x bore x stroke gets cubic inchs then x .7854 for cubic centimeters.
64.45 for Cylinder Head Volume
0 for Piston Head Volume
.40 Gasket Thickness
3.910 Gasket Bore
3.898 Cylinder Bore
Don't know for Deck Clearance
3.622 for Stroke
Rod length blank
Intake Closing point blank
Static Compression Ratio says 3.529
What am I missing. Sorry
I know for cylinder volume I do bore x bore x stroke gets cubic inchs then x .7854 for cubic centimeters.
Cylinder Head Volume (cc) 64.45 Cylinder Head Vol (cubic in.) 3.931
Piston Head Volume (cc) 0 Piston Head Vol (cubic in.) 0.000
Gasket Thickness (in.) .040 Swept Volume (cubic in.) 43.224
Gasket Bore (in.) 3.910 T.D.C. Volume (cubic in.) 4.351
Cylinder Bore Diameter (in.) 3.898 Gasket Volume (cubic in.) 0.480
Deck Clearance (in.)Note: Neg. nubmer above deck, Pos. number below deck -.005 Deck Volume (cubic in.) -0.060
Stroke (in.) 3.622
STATIC COMPRESSION RATIO
10.934
Piston Head Volume (cc) 0 Piston Head Vol (cubic in.) 0.000
Gasket Thickness (in.) .040 Swept Volume (cubic in.) 43.224
Gasket Bore (in.) 3.910 T.D.C. Volume (cubic in.) 4.351
Cylinder Bore Diameter (in.) 3.898 Gasket Volume (cubic in.) 0.480
Deck Clearance (in.)Note: Neg. nubmer above deck, Pos. number below deck -.005 Deck Volume (cubic in.) -0.060
Stroke (in.) 3.622
STATIC COMPRESSION RATIO
10.934
Thread Starter
Staging Lane
Joined: Mar 2010
Posts: 69
Likes: 0
Cylinder Head Volume (cc) 64.45 Cylinder Head Vol (cubic in.) 3.931
Piston Head Volume (cc) 0 Piston Head Vol (cubic in.) 0.000
Gasket Thickness (in.) .040 Swept Volume (cubic in.) 43.224
Gasket Bore (in.) 3.910 T.D.C. Volume (cubic in.) 4.351
Cylinder Bore Diameter (in.) 3.898 Gasket Volume (cubic in.) 0.480
Deck Clearance (in.)Note: Neg. nubmer above deck, Pos. number below deck -.005 Deck Volume (cubic in.) -0.060
Stroke (in.) 3.622
STATIC COMPRESSION RATIO
10.934
Piston Head Volume (cc) 0 Piston Head Vol (cubic in.) 0.000
Gasket Thickness (in.) .040 Swept Volume (cubic in.) 43.224
Gasket Bore (in.) 3.910 T.D.C. Volume (cubic in.) 4.351
Cylinder Bore Diameter (in.) 3.898 Gasket Volume (cubic in.) 0.480
Deck Clearance (in.)Note: Neg. nubmer above deck, Pos. number below deck -.005 Deck Volume (cubic in.) -0.060
Stroke (in.) 3.622
STATIC COMPRESSION RATIO
10.934
How did you come up with .005 , just trying to understand thats all.
243, calculate, calculatiing, calculating, calculation, compression, cylinder, engine, head, heads, ls, ls1, piston, ratio, volume
