Open chambers or not?
Originally Posted by 03 BUSA
Patrick, these are the numbers I have been given:
18.6 BTDC and 58.6 ABDC on the intake
63 BBDC and 23 ATDC on the exhaust
that gives me a DCR of around 8.4.1 and SCR of 11.5.1
this is with pistons .005 out of hole and .056 compressed GM LS7 head gaskets. Let me know what you are coming up with. Thanks.
18.6 BTDC and 58.6 ABDC on the intake
63 BBDC and 23 ATDC on the exhaust
that gives me a DCR of around 8.4.1 and SCR of 11.5.1
this is with pistons .005 out of hole and .056 compressed GM LS7 head gaskets. Let me know what you are coming up with. Thanks.
__________________
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.
FormerVendor
Joined: Nov 2001
Posts: 3,065
Likes: 6
From: Houston, Tx.
Patrick,
I have some cams like that and in cars with around 11.25 that are very fast and never have any knock at all. Maybe they could use a little more compression though but one one like that going 135 in the quarter on pump gas and a hydraulic roller. It probably would be a lil better at 11.5 to one but I'd be afraid to go much higher than that.
I have some cams like that and in cars with around 11.25 that are very fast and never have any knock at all. Maybe they could use a little more compression though but one one like that going 135 in the quarter on pump gas and a hydraulic roller. It probably would be a lil better at 11.5 to one but I'd be afraid to go much higher than that.
Thread Starter
10 Second Club
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From: Kannapolis, NC
Patrick, those 2nd set of numbers I gave you are at .006 and with various calculators used by myself and others we came up with those numbers of 8.4 and 11.5.1
Originally Posted by 03 BUSA
Patrick, those 2nd set of numbers I gave you are at .006 and with various calculators used by myself and others we came up with those numbers of 8.4 and 11.5.1
The numbers will look more like this
Valve events------- 0.006 0.050
Intake Duration - ID 307 257
Exhaust Duration - ED 316 266
Lobe Center Angle - LSA 110 110
Intake Centerline - ICL 110 110
Intake Valve opens - IVO 43.5 18.5 BTDC
Intake Valve closes - IVC 83.5 58.5 ABDC
Exhaust Valve Opens - EVO 88 63 BBDC
Exhaust Valve Closes - EVC 48 23 ATDC
Exhaust Centerline - ECL 110 110
Overlap___________ 91.5 41.5
__________________
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
10 Second Club
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From: Kannapolis, NC
Patrick, thank you for bringing that to my attention. I have sent an e-mail over to Trevor to figure out what is going on. I also have come up with a dcr of around 7.75.1 and that is just not going to work. Thanks again, I will let you know tomorrow what I came up with.
Originally Posted by 03 BUSA
Patrick, thank you for bringing that to my attention. I have sent an e-mail over to Trevor to figure out what is going on. I also have come up with a dcr of around 7.75.1 and that is just not going to work. Thanks again, I will let you know tomorrow what I came up with.
Thread Starter
10 Second Club
iTrader: (25)
Joined: Dec 2004
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From: Kannapolis, NC
Yes, Patrick was correct and saved my build. TSP is engine dynoing a 418 tomorrow with various cams including one with the same specs as mine. I am going to wait to see what kind of cam these heads like. I know it is not a 427 but it will give us a good idea of where we want to be. Trevor is thinking this think will like something larger with a LSA of around 109/108 I will let you all know tomorrow after I find out what each cam did.
