SCR DCR calculator?
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Help me calculate SCR Bore Size: 4.000
Piston Stroke Length: 3.622
Piston Dome Volume: 0
Piston Deck Clearance" -.007
(Those should be the numbers for a stock ls2 bottom end. Correct me if I am wrong.)
Combustion Chamber Volume In CCs: 58
Head Gasket Bore Diameter: 4.030
Compressed Head Gasket Thickness: 0.045
What is the SCR?
Piston Stroke Length: 3.622
Piston Dome Volume: 0
Piston Deck Clearance" -.007
(Those should be the numbers for a stock ls2 bottom end. Correct me if I am wrong.)
Combustion Chamber Volume In CCs: 58
Head Gasket Bore Diameter: 4.030
Compressed Head Gasket Thickness: 0.045
What is the SCR?
Launching!
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This is the one I used because I don't have Excell.
http://www.kb-silvolite.com/calc.php?action=comp[URL=http://]
http://www.kb-silvolite.com/calc.php?action=comp[URL=http://]
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Thread Starter
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Hmm I am doing somin worng...
I am getting the correct SCR (12.3) but the DCR is messed up. (I am getting like a 10.4 DCR... I have never calculated DCR before... so this is probably why I am off.)
Cylinder Head Volume (cc) 58
Piston Head Volume (cc) 0
Gasket Thickness (in.) .045
Gasket Bore (in.) 4.030
Cylinder Bore Diameter (in.) 4.000
Deck Clearance (in.) -.007
Rod Length (in.) 6.098 (Thats a guess?)
Cam info:
-------------------------------Intake-----Exhaust
Valve adjustment:--------------.000"------.000"
Lobe Lift:----------------------.370"------.370"
Gross valve lift 1.70 ratio:-------.629"-----.629"
Duration @ .050" tappet Lift:----243*------247*
Lobe seperation 112*
reccommended Intake cernterline 108*
specs at 108* intake centerline:
Valve timing at--------------------Open-------------------Close
.050" tappet Lift:----------Intake: 13.5* BTDC------------49.5 ABDC
--------------------------Exhaust: 59.5* BBDC-----------7.5* ATDC
specs at 108* intake centerline:
Valve timing at--------------------Open-------------------Close
.050" tappet Lift:----------Intake: 11.5* BTDC------------51.5 ABDC
--------------------------Exhaust: 57.5* BBDC-----------9.5* ATDC
I am getting the correct SCR (12.3) but the DCR is messed up. (I am getting like a 10.4 DCR... I have never calculated DCR before... so this is probably why I am off.)
Cylinder Head Volume (cc) 58
Piston Head Volume (cc) 0
Gasket Thickness (in.) .045
Gasket Bore (in.) 4.030
Cylinder Bore Diameter (in.) 4.000
Deck Clearance (in.) -.007
Rod Length (in.) 6.098 (Thats a guess?)
Cam info:
-------------------------------Intake-----Exhaust
Valve adjustment:--------------.000"------.000"
Lobe Lift:----------------------.370"------.370"
Gross valve lift 1.70 ratio:-------.629"-----.629"
Duration @ .050" tappet Lift:----243*------247*
Lobe seperation 112*
reccommended Intake cernterline 108*
specs at 108* intake centerline:
Valve timing at--------------------Open-------------------Close
.050" tappet Lift:----------Intake: 13.5* BTDC------------49.5 ABDC
--------------------------Exhaust: 59.5* BBDC-----------7.5* ATDC
specs at 108* intake centerline:
Valve timing at--------------------Open-------------------Close
.050" tappet Lift:----------Intake: 11.5* BTDC------------51.5 ABDC
--------------------------Exhaust: 57.5* BBDC-----------9.5* ATDC
Last edited by viewsonic; Jul 10, 2006 at 06:35 PM.
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Thread Starter
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I bought everything from flowtech, (pushrods, heads, cam) so Ed was able to callculate my DCR... I just wanted to be able to do it myslef.
Anywho.
This is what he told me:
12.3:1 SCR
8.75:1 DCR
This will be run on 93 octane. Wathca think?
Anywho.
This is what he told me:
12.3:1 SCR
8.75:1 DCR
This will be run on 93 octane. Wathca think?
hmm, my FTI cam card had .006 and .050* duration. ask Ed for the seat timing if you'd like to calculate DCR yourself. he uses the whole comp catalog at his disposal so there's no telling what lobes he used.
my SCR was 12.03 and DCR 8.5 to be run on 91 oct. but the combo never saw the light.
my SCR was 12.03 and DCR 8.5 to be run on 91 oct. but the combo never saw the light.
Comp has all the cam grinds listed in a pdf file if you look on the website. They tell the .006" timing in deg. If you know what style it is (xe, xer, etc) or the grind # you can figure it out.
Edit my bad the Comp website doesn't ofer the .006" numbers. I used J-rods spreadsheet to figure out the .006" numbers.
Edit my bad the Comp website doesn't ofer the .006" numbers. I used J-rods spreadsheet to figure out the .006" numbers.
Last edited by slowride; Jul 10, 2006 at 07:47 PM.
Yep, my calculator will lookup the lobes provided you enter the proper duration and lift as it is listed in Comp's catalog. Look at the tab titled lobe source if you can't get it to lookup the values properly.