Do bigger cams idle louder than smaller cams
06-03-2007, 08:23 AM
#4
I just recently swapped from a cam with 6 degrees of overlap to one with 16 degrees (at .050") and my exhaust is MUCH louder.
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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.
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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.
06-03-2007, 05:15 PM
#7
Actually, overlap doesn't have much to do with it. Overlap makes the cam lopier, but the thing which makes it louder is opening the exhaust valve earlier in the "power" stroke, when there is higher pressure in the cylinder. Higher pressure, more "pop" when the valve opens (technically called exhaust "blowdown"). So making the exhaust lobe bigger, and/or advancing the exhaust lobe centerline, will make your motor idle (and drive) louder.
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06-04-2007, 03:28 AM
#9
TECH Senior Member
Originally Posted by 71CamaroLS1
Actually, overlap doesn't have much to do with it. Overlap makes the cam lopier, but the thing which makes it louder is opening the exhaust valve earlier in the "power" stroke, when there is higher pressure in the cylinder. Higher pressure, more "pop" when the valve opens (technically called exhaust "blowdown"). So making the exhaust lobe bigger, and/or advancing the exhaust lobe centerline, will make your motor idle (and drive) louder.
06-04-2007, 03:49 PM
#10
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Originally Posted by 71CamaroLS1
Actually, overlap doesn't have much to do with it. Overlap makes the cam lopier, but the thing which makes it louder is opening the exhaust valve earlier in the "power" stroke, when there is higher pressure in the cylinder. Higher pressure, more "pop" when the valve opens (technically called exhaust "blowdown"). So making the exhaust lobe bigger, and/or advancing the exhaust lobe centerline, will make your motor idle (and drive) louder.
Here's a cookie for you. Good job.
