Is a DCR of 8.94 too much?
12-16-2010, 04:31 PM
#1
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Is a DCR of 8.94 too much? I'm planning some changes and with my current cam and bumping the static compression to 11.5:1 the dcr works out to 8.94
Is that too much for 93 octane pump gas?
Is that too much for 93 octane pump gas?
12-16-2010, 07:57 PM
#3
How are you coming up with this 8.94? Can you tell us a little bit more about the combo? You can run that on pump gas just make sure quench is between .035 and .040 and the tune is very good and pay close attention to knock.
12-16-2010, 08:17 PM
#4
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stock ls2
ported 243 heads 64cc
.040" cometic gasket
226/234 113 EPS cam
Quench should be very tight as the stock piston is usually .006 above the deck. Can someone tell me if my math is correct?
Thanks
12-16-2010, 08:24 PM
#5
do you have the .006 values of the cam and .200? by guestimating those im putting you around 8.65. I cant imagine your much more than that either, so i would say you will be fine on pump gas. I also advanced that cam 2 degrees in my calculations. Are you advancing it more than that?
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12-17-2010, 10:28 AM
#8
I've run up to 9.0:1 DCR on 93 octane. You need to be careful with the tune, but it's doable. The tighter quench will help you some.
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2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2018 Cadillac Escalade 6.2L A10 Pat G tuned.
LS1,LS2,LS3,LS7,LT1 Custom Camshaft Specialist For custom camshaft help press here.
Custom LSX tuning in person or via email press here.
2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2018 Cadillac Escalade 6.2L A10 Pat G tuned.
LS1,LS2,LS3,LS7,LT1 Custom Camshaft Specialist For custom camshaft help press here.
Custom LSX tuning in person or via email press here.
12-17-2010, 11:56 AM
#10
TECH Senior Member
12-17-2010, 11:57 AM
#11
http://www.kb-silvolite.com/calc.php?action=comp
Ignore the instructions to add a general 15 degrees to the IVC from calculations derived from duration @ 0.050". That's not reliable. You need to figure it out from 0.006" or whatever your cam manufacture has specified and plug that number in.
Ignore the instructions to add a general 15 degrees to the IVC from calculations derived from duration @ 0.050". That's not reliable. You need to figure it out from 0.006" or whatever your cam manufacture has specified and plug that number in.
