Compression Ratio (Dynamic and static)
Compression Ratio (Dynamic and static) Could someone help me plug in the numbers for this calculator?
http://www.kb-silvolite.com/calc.php?action=comp
Here is what I have so far:
Cylinder head volume : 63 (243's milled .010)
Piston head volume: ??
Gasket thickness: .045
Gasket bore: 3.905?? (I have cometics)
Cylinder bore diameter: 3.898
Deck Clearance: .0001??
Stroke: 3.622??
Rod Length: ??
Intake closing Point: ?? It's a TR 224 on 114.
If you know the number for something that has a ??, please chime in
Also, what compression ratio's (dynamic and static) should I shoot for on a stock short block? It's a DD, but with occasional track times. I'm thinking of getting a new cam and milling the heads a bit more to attain the most desirable numbers.
Thanks!
http://www.kb-silvolite.com/calc.php?action=comp
Here is what I have so far:
Cylinder head volume : 63 (243's milled .010)
Piston head volume: ??
Gasket thickness: .045
Gasket bore: 3.905?? (I have cometics)
Cylinder bore diameter: 3.898
Deck Clearance: .0001??
Stroke: 3.622??
Rod Length: ??
Intake closing Point: ?? It's a TR 224 on 114.
If you know the number for something that has a ??, please chime in
Also, what compression ratio's (dynamic and static) should I shoot for on a stock short block? It's a DD, but with occasional track times. I'm thinking of getting a new cam and milling the heads a bit more to attain the most desirable numbers.
Thanks!
Here is a link to the post with the excel file ...
https://ls1tech.com/forums/showthrea...ighlight=excel
Hope that helps
https://ls1tech.com/forums/showthrea...ighlight=excel
Hope that helps
wow this cant be right can it? MY DCR is crazy high what did i do wrong?
if i add 15 to my cam ABDC like it says then my DCR is only 9.173 wow that is high!!
good luck to me to tune it LOL
ENTER YOUR DATA CALCULATED DATA
Cylinder Head Volume (cc) Cylinder Head Vol
(cubic in.) 03.721
Piston Head Volume (cc) Piston Head Vol
(cubic in.) 00.000
Gasket Thickness (in.) Swept Volume
(cubic in.) 43.244
Gasket Bore (in.) T.D.C. Volume
(cubic in.) 04.164
Cylinder Bore Diameter (in.) Gasket Volume
(cubic in.) 00.539
Deck Clearance (in.)
Note: Neg. nubmer above deck, Pos. number below deck Deck Volume
(cubic in.) -0.096
Stroke (in.) STATIC COMPRESSION RATIO 11.385
OPTIONAL DATA
Rod Length (in.) Adjusted Stroke (in.) 03.171
Intake Closing Point (degrees)
ABDC @ 0.050 lift plus 15 degrees DYNAMIC EFFECTIVE COMPRESSION RATIO 10.097
if i add 15 to my cam ABDC like it says then my DCR is only 9.173 wow that is high!!
good luck to me to tune it LOL
ENTER YOUR DATA CALCULATED DATA
Cylinder Head Volume (cc) Cylinder Head Vol
(cubic in.) 03.721
Piston Head Volume (cc) Piston Head Vol
(cubic in.) 00.000
Gasket Thickness (in.) Swept Volume
(cubic in.) 43.244
Gasket Bore (in.) T.D.C. Volume
(cubic in.) 04.164
Cylinder Bore Diameter (in.) Gasket Volume
(cubic in.) 00.539
Deck Clearance (in.)
Note: Neg. nubmer above deck, Pos. number below deck Deck Volume
(cubic in.) -0.096
Stroke (in.) STATIC COMPRESSION RATIO 11.385
OPTIONAL DATA
Rod Length (in.) Adjusted Stroke (in.) 03.171
Intake Closing Point (degrees)
ABDC @ 0.050 lift plus 15 degrees DYNAMIC EFFECTIVE COMPRESSION RATIO 10.097
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Originally Posted by 98formulaMAH
what is the stock LS1 piston head volume?
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Originally Posted by PREDATOR-Z
If your cam is advanced 114+4 then you are ~ 11.0:1 and 8.65 DCR
Right where you should be.
Right where you should be.
Thanks!
Originally Posted by Xtnct00WS6
You're responding to camarokid correct? Because I figured mine to be about 10.7:1 and 8.04 DCR.
Thanks!
Thanks!
63
0
.045
3.9
3.9
-.007
3.622
(optional)
6.098
72.5
That is if your cam has no advance. If it is has advance of +4 then the last number should be 68.5 instead of 72.5 which gives a DCR of 8.539.
TECH Senior Member
Joined: Mar 2004
Posts: 14,620
Likes: 17
From: BFE
Originally Posted by Xtnct00WS6
You're responding to camarokid correct? Because I figured mine to be about 10.7:1 and 8.04 DCR.
Thanks!
Thanks!
I do it on J-Rod calc. No matter how you look at it this is a guestimate.
You need to imput actual values but it is pretty close.
Like 10.9X SCR and 8.6X DCR
Ohh ok!
Do you have a link so I can download j-rod's calculator? I've been using the modified one by PianoProdigy.
I also just used this one (http://www.rbracing-rsr.com/compstaticcalc.html) and got 10.85 or 10.89 depending on if I use -.0007 or .0007. Which one should it be?
EDIT: it should have been either -.007 or .007 which is either 11.06 or 10.68. Is the negative number when it's out of the hole?
Do you have a link so I can download j-rod's calculator? I've been using the modified one by PianoProdigy.
I also just used this one (http://www.rbracing-rsr.com/compstaticcalc.html) and got 10.85 or 10.89 depending on if I use -.0007 or .0007. Which one should it be?
EDIT: it should have been either -.007 or .007 which is either 11.06 or 10.68. Is the negative number when it's out of the hole?
TECH Senior Member
Joined: Mar 2004
Posts: 14,620
Likes: 17
From: BFE
Originally Posted by camarokid94
Can Someone Help Me Figure Mine? Its A 113+1
The cam I have is a Futral Custom grind but I input my numbers in the calculator as they should have been. How far off is the calculator going to be since it is using Comp grinds and not the CamMotion grinds?
Here is what I have:
Cam: 238/242 112
Bore: 3.898
Stroke: 3.622
Rod: 6.125
Heads: 60cc
Pistons: -4cc
Deck: standard
Head Gasket: stock
I got a DCR of 8.78 and SCR of 11.49 using this calculator. Can someone confirm this for me being that my cam is a CamMotion grind.
*EDIT - I used PianoProdigy's calculator*
Thanks,
John
Here is what I have:
Cam: 238/242 112
Bore: 3.898
Stroke: 3.622
Rod: 6.125
Heads: 60cc
Pistons: -4cc
Deck: standard
Head Gasket: stock
I got a DCR of 8.78 and SCR of 11.49 using this calculator. Can someone confirm this for me being that my cam is a CamMotion grind.
*EDIT - I used PianoProdigy's calculator*
Thanks,
John