Too much DCR?
Originally Posted by Beast96Z
Which is still a guesstimation, correct?
__________________
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
2022 Cadillac Escalade 6.2L A10 S&B CAI, Corsa catback.
2023 Corvette 3LT Z51 soon to be modified.
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
2022 Cadillac Escalade 6.2L A10 S&B CAI, Corsa catback.
2023 Corvette 3LT Z51 soon to be modified.
Custom LSX tuning in person or via email press here.
Thread Starter
Launching!
Joined: Feb 2006
Posts: 270
Likes: 0
Originally Posted by Patrick G
That gets me back to my original post of 278/282. 
ADV duration @ .006 is 281* intake, and 285* ex. So plugging in the other parameters for a stock bottom end LS6 with 61cc heads, I get an SCR of 11.17, and a DCR of 8.31 which should be OK with 92 octane, n'es pas?
Thread Starter
Launching!
Joined: Feb 2006
Posts: 270
Likes: 0
Oh great! This calculating business sure is fun. I've found even more bad data that skews the final #s. Crane now tells me there's 5* advance ground in, which would move my ICL to 107*. Also, I was figuring a MLS (stock GM) at .052 compressed, and should be .060. So anyway, the new #s make the final (Keerist, I hope) SCR @ 10.94, and the DCR @ 8.5. Still OK for pump gas, methinks.
Hope this combo runs good, Crane sure doesn't tell you all the particulars upfront.
Hope this combo runs good, Crane sure doesn't tell you all the particulars upfront.
TECH Enthusiast
Joined: Mar 2004
Posts: 647
Likes: 0
From: Australia
Originally Posted by exSSer
Oh great! This calculating business sure is fun. I've found even more bad data that skews the final #s. Crane now tells me there's 5* advance ground in, which would move my ICL to 107*. Also, I was figuring a MLS (stock GM) at .052 compressed, and should be .060. So anyway, the new #s make the final (Keerist, I hope) SCR @ 10.94, and the DCR @ 8.5. Still OK for pump gas, methinks.
Hope this combo runs good, Crane sure doesn't tell you all the particulars upfront.
Hope this combo runs good, Crane sure doesn't tell you all the particulars upfront.
Best times similar combo over here 11.4@120MPH heavy *** commodore full weight 3600lbs. Are we feeling better?
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Launching!
Joined: Feb 2006
Posts: 270
Likes: 0
Originally Posted by Viper
I thought it was .052 compressed, that's the figures I've been using in calcs.
I've gone through lots of old posts doing searches, and that's the figure that keeps coming up. At .052 my #s translate to 11.17, and 8.69 DCR.
edit: I checked the calculator. The stock '02+ MLS gaskets ARE .060 compressed, because using this figure, my stock CR computes to 10.48:1, which is correct.
Thanks to our down under brother. I'd planned on installing the cam dot to dot, and haven't a clue how to degree the thing. Hope that I get lucky, I guess. It'll run through a 6 speed, and also will be equipped with a ported FAST/LS2 90, and since the car only weighs about 3100, should be plenty fast.
Last edited by exSSer; Jul 11, 2006 at 01:19 PM.
