dcr help
Thread Starter
Teching In
Joined: Jan 2008
Posts: 35
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From: Amarillo TX
dcr help probly in the wrong section but i figured you guys might give better advice i need help figuring out my dcr i triyed doing it myself and didnt like my numbers hoping im wrong
248/254 .615 .622 114
intake centerline 110
duration @ .006 297 307
VALVE EVENTS @.050 INT 14 BTDC 54 ABDC
EXH 65 BBDC 9 BTDC
BORE 3.905
4.00 STROKE
6.125 RODS
PISTONS .020 OUT OF HOLE -7.05CC DIAMONDS
62-64 CC HEADS WITH .045 GASKETS
248/254 .615 .622 114
intake centerline 110
duration @ .006 297 307
VALVE EVENTS @.050 INT 14 BTDC 54 ABDC
EXH 65 BBDC 9 BTDC
BORE 3.905
4.00 STROKE
6.125 RODS
PISTONS .020 OUT OF HOLE -7.05CC DIAMONDS
62-64 CC HEADS WITH .045 GASKETS
Last edited by BOTTLEFED383; Feb 11, 2008 at 10:07 PM. Reason: ERROR
I got around 10.6-1 SCR and 7.46:1 DCR. Assuming your intake lobe is symetrical (probably not) and your intake valve closes at 78.5 ABDC @.006. The past 2 motors I've built and every motor I build from this point will have SCR dictated by IVC.
Without a definitive advertised IVC, I'm getting a SCR of 11.3-11.6 and a DCR (assuming .006 IVC of 78.5) of 8.03-8.2, depending upon the chamber size of 62-64cc. These are basically the same results I get when I use this online calculator: http://www.csgnetwork.com/compcalc.html. Not sure what the discrepancy is between the different results.
Heads
Chamber volume (cc) 64.000
Gasket
Gasket compressed thickness (in) 0.045
Gasket Bore (in) 3.910
Block
Deck clearance (in) (+ below the deck, - above the deck) -0.020
Stroke (in): 4.000
Cylinder Bore Diameter (in) 3.905
Piston disk volume (cc) (+ for dish, - for dome) 7.050
Connecting Rod length (in) 6.125
Advertised Intake Closing timing (angle) in degrees ABDC 78.500
Heads
Chamber volume (cc) 64.000
Gasket
Gasket compressed thickness (in) 0.045
Gasket Bore (in) 3.910
Block
Deck clearance (in) (+ below the deck, - above the deck) -0.020
Stroke (in): 4.000
Cylinder Bore Diameter (in) 3.905
Piston disk volume (cc) (+ for dish, - for dome) 7.050
Connecting Rod length (in) 6.125
Advertised Intake Closing timing (angle) in degrees ABDC 78.500
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No its his current build not in the car yet.....he is building a 383 and only lacks the heads but he wanted to see if he was doing the math right....we both thought the 7.53 he was getting was off.......ITs the Texas Giant cam from TSP incase that helps u guys.
Without a definitive advertised IVC, I'm getting a SCR of 11.3-11.6 and a DCR (assuming .006 IVC of 78.5) of 8.03-8.2, depending upon the chamber size of 62-64cc. These are basically the same results I get when I use this online calculator: http://www.csgnetwork.com/compcalc.html.
