roller rockers?
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Joined: Aug 2007
Posts: 92
http://www.cranecams.com/?show=newProduct&id=12
found these on a web search, 20 horse sounds like alot but thats how all these aftermarket companies advertise, i figure divide and aftermarket claim by 60% and that is actual gain.
so maybe 8 horse?
found these on a web search, 20 horse sounds like alot but thats how all these aftermarket companies advertise, i figure divide and aftermarket claim by 60% and that is actual gain.
so maybe 8 horse?
Thread Starter
Registered User
Joined: Aug 2007
Posts: 92
http://www.cranecams.com/?show=streetShark
found this site, seems like a good idea if they are what they claim, the only thing fishy about this is that the dyno graph looks like a third grader drew it out and it shows that the ls1 motor makes more power at 6,000 rather than 5,000, on my dyno sheet hp dropped after about 5,600?
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2000 auto camaro
13.54 @ 104 2.049 60' stock 2.73
12.94 @ 109 2.002 60' full exhaust, lid, tune, nitto 555r 2.73
12.279 @ 111.06 1.740 60' full exhaust, lid, tune, nitto 245/50-16 555r 3.73 moser 12-bolt 2800 fuddle, ls6 intake manifold, slp under drive pully
found this site, seems like a good idea if they are what they claim, the only thing fishy about this is that the dyno graph looks like a third grader drew it out and it shows that the ls1 motor makes more power at 6,000 rather than 5,000, on my dyno sheet hp dropped after about 5,600?
__________________
2000 auto camaro
13.54 @ 104 2.049 60' stock 2.73
12.94 @ 109 2.002 60' full exhaust, lid, tune, nitto 555r 2.73
12.279 @ 111.06 1.740 60' full exhaust, lid, tune, nitto 245/50-16 555r 3.73 moser 12-bolt 2800 fuddle, ls6 intake manifold, slp under drive pully
Registered User
Joined: Sep 1998
Posts: 8,319
From: US 1 Mile Marker 52 in the Florida Keys
the ls1 motor comes with partial roller rockers stock. the rocker pivot point...think its the "trunion"...is a roller bearing. the tip is still the standard non-roller style. remember that stock ratio is 1.7 anyway.
several companies make full roller rockers for the lsx engine. benefits are minimal unless you increase the ratio to 1.8, 1.85, or 1.89.
15hp i think is a safe estimate of power increase, however for the cost of the upgrade...it really isn't very cost effective.
besides, most aftermarket cams (any worth installing) prevent the use of higher ratio rockers due to the fast ramp rates.
its better to get a cam with the added lift ground in....rather than a low lift cam and add rockers.
several companies make full roller rockers for the lsx engine. benefits are minimal unless you increase the ratio to 1.8, 1.85, or 1.89.
15hp i think is a safe estimate of power increase, however for the cost of the upgrade...it really isn't very cost effective.
besides, most aftermarket cams (any worth installing) prevent the use of higher ratio rockers due to the fast ramp rates.
its better to get a cam with the added lift ground in....rather than a low lift cam and add rockers.
Registered User
Joined: Apr 2003
Posts: 4,507
From: FTW, TX
They have a roller fulcrum. They're light and perform well and I know of many 11-10 sec cars still running their stockers.
Teke said it well. If you're wanting more lift, just wait until you can do a cam change. Most aftermarket cams don't like the 1.8 ratio so you're limiting yourself on cam choice with this purchase. The cams that can run the 1.8 ratio utilize old lobe technology. In other words, you're still leaving some power on the table.
Teke said it well. If you're wanting more lift, just wait until you can do a cam change. Most aftermarket cams don't like the 1.8 ratio so you're limiting yourself on cam choice with this purchase. The cams that can run the 1.8 ratio utilize old lobe technology. In other words, you're still leaving some power on the table.
Retired
Joined: Oct 1999
Posts: 3,166
From: Inside Uranus
Don't change the rockers unless you're going to a shaft setup. There's simply no need to. With the newer aftermarket cams available, you'll run into PTV clearance with anything other than 1.7:1 rockers anyway. I ran stock rockers in all of my cars.
Registered User
Joined: Oct 2003
Posts: 2,140
From: DOVER DE
The stock rockers are actually prety good compared to what GM used on Gen I & II SBs. All those claiming 15-20 hp increase are doing it with increased ratio rockers. If they used stock ratio RRs the increase would be almost nothing and not worth the price.
The problem with increasing the rocker ratio on the Gen III motors is that it can dastically decrease the life of valve train components. In short, if you install anything higher than stock ratio RRs on your LSx motor, keep either the stock or a very mild cam in it or you will tear up the valve train.
Re'
The problem with increasing the rocker ratio on the Gen III motors is that it can dastically decrease the life of valve train components. In short, if you install anything higher than stock ratio RRs on your LSx motor, keep either the stock or a very mild cam in it or you will tear up the valve train.
Re'
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