We Should List the DCR For Popular Off the Shelf Cams
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07-16-2006, 04:12 AM
#9
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Still too many variables.
Depends on where you time the cam, +0, +4, +2 etc also head gasket thickness etc.
Just put the right numbers into the calculator and stop being lazy.
Depends on where you time the cam, +0, +4, +2 etc also head gasket thickness etc.
Just put the right numbers into the calculator and stop being lazy.
07-16-2006, 12:57 PM
#10
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Originally Posted by ringram
Still too many variables.
Depends on where you time the cam, +0, +4, +2 etc also head gasket thickness etc.
Just put the right numbers into the calculator and stop being lazy.
Depends on where you time the cam, +0, +4, +2 etc also head gasket thickness etc.
Just put the right numbers into the calculator and stop being lazy.
07-16-2006, 02:55 PM
#12
Here's one of the most popular. At the bottom, DO NOT add 15 to the .050" IVC. The calculator uses .006" IVC, which is usally 25*-27* bigger than the .050" IVC on a LS1 Hydraulic roller. http://www.kb-silvolite.com/calc.php?action=comp
While it would be nice to have DCR's listed for diffrent cams, I agree that there are a million variables. Even with the stock short block, you'd have up to 12 DCR's for diffrent possible cam timing and that's just with advance, not to mention diffrent LSA's. If shelf cams were just XXX size, then it would be easy, but you do have options when you order one. Advance and LSA being the big options.
While it would be nice to have DCR's listed for diffrent cams, I agree that there are a million variables. Even with the stock short block, you'd have up to 12 DCR's for diffrent possible cam timing and that's just with advance, not to mention diffrent LSA's. If shelf cams were just XXX size, then it would be easy, but you do have options when you order one. Advance and LSA being the big options.
07-16-2006, 03:25 PM
#13
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Why's everyone getting so picky? Yeah, its a rough estimate but its better than nothing. Hell, even the cams them selves have some variance. I suppose every cam has to to be measured with a cam dr.
07-16-2006, 04:13 PM
#14
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Originally Posted by dug
Why's everyone getting so picky? Yeah, its a rough estimate but its better than nothing. Hell, even the cams them selves have some variance. I suppose every cam has to to be measured with a cam dr.
07-16-2006, 06:10 PM
#15
Originally Posted by dug
Why's everyone getting so picky? Yeah, its a rough estimate but its better than nothing. Hell, even the cams themselves have some variance. I suppose every cam has to to be measured with a cam dr.
07-16-2006, 06:44 PM
#16
LOL, at least dynamic compression is something you can calculate. Back a number of years ago, very few people knew what Stall Torque Ratio was when it came to torque converters. After Yank started publishing their STR numbers (as tested on GM's transmisison dyno), other companies started publishing their own STR numbers. Once that started, everybody wanted to buy a converter based on stall speed and STR. This was a case of too much information for too many people and it actually made selecting a converter worse than better because instead of trusting the converter manufacturers for their best recommendation based on the customer's mods, the customers became converter experts overnight (usually picking the wrong converter).
I fear with too much information (without good background as to why things work as they do), cam selection will go down the same road. The moral? When in doubt, consult an expert in the field for a cam that meets your exact needs. This will keep you from being disappointed.
I fear with too much information (without good background as to why things work as they do), cam selection will go down the same road. The moral? When in doubt, consult an expert in the field for a cam that meets your exact needs. This will keep you from being disappointed.
__________________
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.
07-16-2006, 08:06 PM
#18
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Originally Posted by Patrick G
LOL, at least dynamic compression is something you can calculate. Back a number of years ago, very few people knew what Stall Torque Ratio was when it came to torque converters. After Yank started publishing their STR numbers (as tested on GM's transmisison dyno), other companies started publishing their own STR numbers. Once that started, everybody wanted to buy a converter based on stall speed and STR. This was a case of too much information for too many people and it actually made selecting a converter worse than better because instead of trusting the converter manufacturers for their best recommendation based on the customer's mods, the customers became converter experts overnight (usually picking the wrong converter).
I fear with too much information (without good background as to why things work as they do), cam selection will go down the same road. The moral? When in doubt, consult an expert in the field for a cam that meets your exact needs. This will keep you from being disappointed.
I fear with too much information (without good background as to why things work as they do), cam selection will go down the same road. The moral? When in doubt, consult an expert in the field for a cam that meets your exact needs. This will keep you from being disappointed.
I've got a buddy that has been building trans & converters for about 15 years and when I say STR he looks at me like .I'm no expert ,but I've learned ALOT from this forum and I've never heard or mentioned DCR outside of ls1tech ( I hang around alot of dirt trackers and help them pick their cam & heads and dcr is never mentioned). Its great for the knowledge but "book smarts" don't get you as far as actual experience.