Powerband 110 lsa vs 112
05-15-2002, 01:23 PM
#1
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Powerband 110 lsa vs 112 On an identical cam, about how much would the powerband or peak power move with a 110 vs 112 lsa?
<small>[ May 15, 2002, 01:29 PM: Message edited by: Pro Stock John ]</small>
<small>[ May 15, 2002, 01:29 PM: Message edited by: Pro Stock John ]</small>
05-15-2002, 01:48 PM
#3
Re: Powerband 110 lsa vs 112 I respectfully disagree with PSJ. I feel that once you start getting toward 110 LSA, you're not going to see a 200 rpm drop in peak power. Maybe 50-100 rpms.
If that logic were true, a 222/222 cam would peak like this:
114 LSA: 6400 rpms
112 LSA: 6200 rpms
110 LSA: 6000 rpms
108 LSA: 5800 rpms
106 LSA: 5600 rpms
I really don't think it's 100 rpms per 1 degree loss of lobe separation angle. Most LSAs on carbureted motor cams fall around 106. A 222/222 106 LSA cam is not going to peak at 5600 rpms in my opinion...probably more like 6000 rpms.
If that logic were true, a 222/222 cam would peak like this:
114 LSA: 6400 rpms
112 LSA: 6200 rpms
110 LSA: 6000 rpms
108 LSA: 5800 rpms
106 LSA: 5600 rpms
I really don't think it's 100 rpms per 1 degree loss of lobe separation angle. Most LSAs on carbureted motor cams fall around 106. A 222/222 106 LSA cam is not going to peak at 5600 rpms in my opinion...probably more like 6000 rpms.
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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.
05-15-2002, 04:06 PM
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Re: Powerband 110 lsa vs 112 actually depending on the cam timing events in relation to the motor it may not change the peak points at all. What it will do is change the shape of the curve though. So you may have the same tq and hp peaks, but what happens in between may look entirely different.
Then you get into exhaust setups. Open headers respond better to tighter LSA's. Rod/stroke ratios will effect what LSA works better. It goes on and on.
Sorry, but it is a really in depth subject.
Then you get into exhaust setups. Open headers respond better to tighter LSA's. Rod/stroke ratios will effect what LSA works better. It goes on and on.
Sorry, but it is a really in depth subject.
05-15-2002, 04:53 PM
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Re: Powerband 110 lsa vs 112 Patrick... I don't know which carb motor cams you've been looking at, but 106 is a pretty damn tight lobe sep. Most of your average SBC weekend warrior type of cams are ground on anything from a 110 lobe sep to 114.
Sure, once you sart getting into the SERIOUS cams (7500+ RPM mechanical rollers) you'll start seeing 106-108 degree lobe seps, but most of the streetable cams are ground wider than that.
Sure, once you sart getting into the SERIOUS cams (7500+ RPM mechanical rollers) you'll start seeing 106-108 degree lobe seps, but most of the streetable cams are ground wider than that.
