07-30-2009, 07:08 PM | #1 |
Drives: 2SS/RS LS3 RJT Join Date: Jun 2009
Location: Northern Virginia
Posts: 755
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Effects of Cam Switch on Engine Life
What will the effect of changing a cam be on engine life?
I spoke with Mast Motorsports about their stage 1 (least Aggressive) cam which is designed to be used in conjunction with a supercharger. They told me any cam switch requires replacing the valve springs for proper engine wear. I also spoke with Ron at Vengeance Racing and he recommends changing the springs at 30,000 mile intervals to maximize life. I intend to supercharge this engine. I am tempted for the price/performance gain to start by first replacing the cam. I don't want to lose the bottom or mid-range acceleration. I also don't want to damage the engine. I've read everything I can find, but don't understand it well enough yet. I have been following pharmMD's build, which is along the lines of what I intend to do. I am by no means an expert and all vendors I mentioned here have been extremely helpful. If something is inaccurate please let me know. Also, while the engine is taken apart would it be a good idea to replace any other internals? I do have a budget and will be forced to do this in stages. I intend to keep the car so I can take my time and do it right. Any recommendations? |
07-30-2009, 07:48 PM | #2 | |||||
Truth Enforcer
Drives: anything I can get my hands on Join Date: Sep 2006
Location: anywhere and everywhere
Posts: 22,797
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lets pull this apart shall we...
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as for the 30k, ive heard of it, but never done it. and dont know any one else who has, with the exception of guys who are thrashing their cars at the track all the time and pushing every bit of their motors to the brink. Quote:
and since you are going to be pulling the top of the motor apart anyway, id hold off on the cam swap until you are ready to do the s/c install. as you need a tune 99% of the time with a cam swap. (the other 1% is for hot cams and such that are just a bump over stock and while you still need a tune with them, you can function without) Quote:
give Mast another call and talk to them with your plans in detail on your overall goal with the car.
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Never race anything you can't afford to light on fire and push off a cliff
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07-30-2009, 09:09 PM | #3 |
Drives: 1991 Camaro RS Join Date: Mar 2009
Location: Dallas area
Posts: 596
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I tend to agree w/ the above post...if you're definitely going to supercharge it, I'd do the cam at the same time. I have a friend who built a Cobra engine to supercharge but hasn't supercharged it, and I wouldn't want to live with those cams.
And yes, you should upgrade the valvesprings with a cam.
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2010 Camaro SS in black/beige: Sold. | '91 Camaro RS: Still the dream car!
'98 Camaro SS: Incon twin turbo. Sold | '99 Camaro SS: Heads/cam/bolt-ons. Sold. |
09-23-2009, 08:52 PM | #4 |
Drives: #3124!!! Join Date: Apr 2008
Location: Iowa
Posts: 130
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I'm doing a similar swap with a slightly more aggressive cam. The local speed shop I ordered from said I'd be fine with stock lifters/pushrods since the car is brand new. I'm skeptical. Anyone know the limits of LS3 pushrods?
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09-24-2009, 07:30 AM | #5 |
Drives: 98 WS6 Join Date: Jul 2009
Location: NC
Posts: 236
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For $100-$110.00 I would go ahead and replace the factory pushrods As far as the changing the valvesprings every 30K miles that's always a good safe idea to tell all your customers. The lobes on the camshafts these days are pretty aggresive and harder on the valvetrain than the stuff that was built years ago.
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09-24-2009, 08:03 AM | #6 |
Drives: 2013 ZL1 Rally Yellow Join Date: May 2009
Location: Knightdale, NC
Posts: 347
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I would personally replace the springs every 20K miles. It is a cheap investment in the long run.
Bryan |
09-24-2009, 08:03 AM | #7 | |
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I would be skeptical of them also. The pushrods may be good enough but the valvetrain geomety will most likely change with the new cam. You would most likely need diff. length pushrods to get it right. |
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09-24-2009, 09:25 AM | #8 |
Drives: 2013 Artic White GrandSport Join Date: Jun 2009
Location: In the shop
Posts: 339
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The pushrods are a VERY smart investment when doing a camshaft upgrade. The more aggressive lobes will cause flex/distortion in the OEM pushrods.
As mentioned above, the smaller base circle of some of the aftermarket camshafts will require different length pushrods from time to time. Changing spings, while alot of people dont do it, is an EXCELLENT investment in the longevity of your engine.. I have seen people push their aftermarket springs to 50,000 miles and come in with valve sticking thru their pistons... Not often, but it does happen. |
09-24-2009, 09:43 AM | #9 | |
Drives: 2010 Camaro SS Join Date: Oct 2008
Location: Smithfield,NC
Posts: 1,203
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I sure am glad RPM is doing all my work on my Car...... They know there stuff and look after there Customers..... |
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09-24-2009, 10:55 AM | #10 |
Drives: 98 WS6 Join Date: Jul 2009
Location: NC
Posts: 236
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09-24-2009, 11:17 AM | #11 |
Drives: Bird Join Date: Nov 2008
Location: USA
Posts: 266
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Go with dual valvesprings, worth the money.
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09-24-2009, 11:19 AM | #12 | |
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Add a nice set of lifters and you are golden, for absolute performance and longevity. Regards |
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