GSC 262in/272ex Cam Dyno Results (dynoflashed)
Mar 26, 2005, 07:49 AM
#31
Originally Posted by Evol_VIII
That is what I thought as well. I thought I read that these cams came from the same factory and were "identical" but didn't say HKS on them so they could be sold at a cheaper price. $549 a set? I can get HKS cams for less then that.
http://www.logicperformance.com/data...roducts_id=728
Mar 26, 2005, 08:14 AM
#32
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Originally Posted by EVO8LTW
What is GSC recommending on valve springs? It seems like if these cams really do make more power than HKS with the same duration and max lift, then they must have steeper cam lobes. I can't think of any other way that they could make more power. And if they do have steeper lobes, then they would be harder on valvesprings. Either that, or they are "underrated" on lift in general, which would also create a need for different valvesprings given that HKS lifts are already put the retainer closer to the valveseals. Has GSC said anything about how their cams compare to HKS in specs and lobe profile? I don't think I've seen anything.
Mar 26, 2005, 08:25 AM
#34
Al at Dynoflash is the one working on the comparo. That won't really answer the question though. The question isn't just whether one brand makes more power -- it's how and why it makes more power. With camshafts, sometimes more power/tq comes at the price of longtime valvetrain longevity. For example, in the domestic world, Comp Cams makes a line of camshafts called the Xtreme Energy series. They have steeper lobe profiles and make much better hp/tq than more traditional grinds with the same specs (they split the difference between a traditional hydraulic lobe profile and a solid lifter lobe profile). Only problem is that they really beat up your valvetrain and require a stouter, lighter valvespring/retainer set-up and stiffer hydraulic lifters to give optimal performance over the long haul. Just tossing them on a car and doing an initial dyno doesn't necessarily tell the whole story, especially on a daily driver. I've got one of those cams in my Camaro and it makes great power, but about 10K miles later I had to replace the valvesprings and put in bettery springs and Ti retainers to continue to rev cleanly to redline. It's worth it to me, but it's definitely a hidden cost of the improved performance.
Last edited by EVO8LTW; Mar 26, 2005 at 08:30 AM.
Mar 26, 2005, 08:36 AM
#35
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Originally Posted by EVO8LTW
Al at Dynoflash is the one working on the comparo. That won't really answer the question though. The question isn't just whether one brand makes more power -- it's how and why it makes more power. With camshafts, sometimes more power/tq comes at the price of longtime valvetrain longevity. For example, in the domestic world, Comp Cams makes a line of camshafts called the Xtreme Energy series. They have steeper lobe profiles and make much better hp/tq than more traditional grinds with the same specs (they split the difference between a traditional hydraulic lobe profile and a solid lifter lobe profile). Only problem is that they really beat up your valvetrain and require a stouter, lighter valvespring/retainer set-up and stiffer hydraulic lifters to give optimal performance over the long haul. Just tossing them on a car and doing an initial dyno doesn't necessarily tell the whole story, especially on a daily driver. I've got one of those cams in my Camaro and it makes great power, but about 10K miles later I had to replace the valvesprings and put in bettery springs and Ti retainers to continue to rev cleanly to redline. It's worth it to me, but it's definitely a hidden cost of the improved performance.
Mar 26, 2005, 11:06 AM
#37
If your really that worried, just buy new springs and retainers when you change out your cams, if your not that worried, and are going to play it by the ear perse, just install the cams with stock valvetrain.
I mean not to be funny, just the way I'm seeing your question is like do you want a straw with that milkshake or without? Some people will get it a straw to be safe, and some will risk not having one and may end up spilling some on your shirt!!
Bottom line if you feel more comfortable doing springs and retainers when you do your cams, then do it.
I mean not to be funny, just the way I'm seeing your question is like do you want a straw with that milkshake or without? Some people will get it a straw to be safe, and some will risk not having one and may end up spilling some on your shirt!!
Bottom line if you feel more comfortable doing springs and retainers when you do your cams, then do it.
Mar 26, 2005, 09:27 PM
#40
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What is the difference between these CAMS and the HKS units? I mean if they have the same lift and duration? How will one be better then the Other? I run straight 272's and get teh Same WHP, so My guess is that they are just as good? IDK.
Mar 26, 2005, 10:15 PM
#41
Originally Posted by umiami80
What is the difference between these CAMS and the HKS units? I mean if they have the same lift and duration? How will one be better then the Other? I run straight 272's and get teh Same WHP, so My guess is that they are just as good? IDK.
Mar 27, 2005, 09:52 AM
#43
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Originally Posted by EVO8LTW
Al at Dynoflash is the one working on the comparo. That won't really answer the question though. The question isn't just whether one brand makes more power -- it's how and why it makes more power. With camshafts, sometimes more power/tq comes at the price of longtime valvetrain longevity. For example, in the domestic world, Comp Cams makes a line of camshafts called the Xtreme Energy series. They have steeper lobe profiles and make much better hp/tq than more traditional grinds with the same specs (they split the difference between a traditional hydraulic lobe profile and a solid lifter lobe profile). Only problem is that they really beat up your valvetrain and require a stouter, lighter valvespring/retainer set-up and stiffer hydraulic lifters to give optimal performance over the long haul. Just tossing them on a car and doing an initial dyno doesn't necessarily tell the whole story, especially on a daily driver. I've got one of those cams in my Camaro and it makes great power, but about 10K miles later I had to replace the valvesprings and put in bettery springs and Ti retainers to continue to rev cleanly to redline. It's worth it to me, but it's definitely a hidden cost of the improved performance.
The purpose of my test will be to see how the power and tq is effected with the various cams on the same car - same dyno. I am also trying to get the Crower cams to test as well.
I can not test long term wear and reliability - but do not think it will be an issue.
