stock lifter vs. compcam lifter
Thread Starter
TECH Fanatic
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From: kuwait
stock lifter vs. compcam lifter Waht is the difference between GM stock lifters and compcam lifters ?
850-16 is the part # for the standard LS1 compcam hydraulic roller lifter.
Thank you
Adnan
850-16 is the part # for the standard LS1 compcam hydraulic roller lifter.
Thank you
Adnan
TECH Apprentice
Joined: Aug 2002
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From: Gambrills, MD
Re: stock lifter vs. compcam lifter Comp Cams lifters are made by Comp Cams, & GM lifters are made by GM. They are very similar. Ditto for the Crane lifters.
The Comp Cams R-series lifters #875-16 are lighter, designed for fast-ramp cams. However, they're not currently available.
Take your pick.
The Comp Cams R-series lifters #875-16 are lighter, designed for fast-ramp cams. However, they're not currently available.
Take your pick.
TECH Regular
Joined: Jan 2002
Posts: 414
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From: Orlando, FL
Re: stock lifter vs. compcam lifter The Type-R lifters also have more preload designed into the lifter. If you look at them you will see a shim at the pushrod seat. You will need a pushrod ~ 0.050" longer if you use the Type Rs
Tim
Tim
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Re: stock lifter vs. compcam lifter hey tim,
whats up man it's carter,what have you been up 2?heard the z is gone or going and your getting a c5 <img border="0" alt="[Burnout]" title="" src="graemlins/burnout.gif" /> sweet choice,i was thinkin the same thing hehe but i love my z to much to leave it..but anyways,I also have spun the R's over 7k and no problems...what could have been the problem is incorrect pushrod length or to much spring pressure and just collapst the lifters..but who know's..could have been a bad set like 941 valvesprings were...just my 02...later!
carter
whats up man it's carter,what have you been up 2?heard the z is gone or going and your getting a c5 <img border="0" alt="[Burnout]" title="" src="graemlins/burnout.gif" /> sweet choice,i was thinkin the same thing hehe but i love my z to much to leave it..but anyways,I also have spun the R's over 7k and no problems...what could have been the problem is incorrect pushrod length or to much spring pressure and just collapst the lifters..but who know's..could have been a bad set like 941 valvesprings were...just my 02...later!
carter
Staging Lane
Joined: Dec 2001
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From: Bay Area, CA
Re: stock lifter vs. compcam lifter </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by TimZ28:
<strong>The standard Comps or the Type Rs??? I ran my Type Rs to 7200 on juice and never had a single problem. Please elaborate on the problem you had.
Tim</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Hey Tim,
I had the Type R's and floated one and ended up bending a valve. Took a nice knick out of the piston. I ran the 941's, so no problems with spring pressure. Oh well... <img border="0" title="" alt="[Sad]" src="gr_sad.gif" />
<strong>The standard Comps or the Type Rs??? I ran my Type Rs to 7200 on juice and never had a single problem. Please elaborate on the problem you had.
Tim</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Hey Tim,
I had the Type R's and floated one and ended up bending a valve. Took a nice knick out of the piston. I ran the 941's, so no problems with spring pressure. Oh well... <img border="0" title="" alt="[Sad]" src="gr_sad.gif" />
Re: stock lifter vs. compcam lifter Does someone have a pic of the comp R series lifter next to a GM lifter for different details???? I have these: http://www.schubeckracing.com/contact.htm
<img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />
<img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />
TECH Senior Member
Joined: Nov 2001
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From: Lake Zurich, IL
Re: stock lifter vs. compcam lifter TTT
I'm replacing my lifters when I put the cam in... are GM lifters more reliable? Haven't heard much about Crane lifters.... what's the low down?
I'm replacing my lifters when I put the cam in... are GM lifters more reliable? Haven't heard much about Crane lifters.... what's the low down?
TECH Regular
Joined: Jan 2002
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From: Orlando, FL
Re: stock lifter vs. compcam lifter Carter,
The Z should be back out by the end of the month. It won't be as built as the last configuration but should hold it's own against most of the N/A Zs around town. I was at the track recently and was a bit disappointed in the LS1 crowd. A year after I last ran my car at the track I still see people doing stupid things. There should be alot more mid 11 second cars around town these days.
As for the Type Rs... I wouldn't hesitate to use them again in any future motor I put together for my Z. One failure (not proven to be the lifter btw) should not deter anyone from going with the Comp lifters. Comp is very clear about the amount of preload needed for those lifters... it would be rare for anyone to hit that preload without adjustable rockers or custom length pushrods.
Tim
The Z should be back out by the end of the month. It won't be as built as the last configuration but should hold it's own against most of the N/A Zs around town. I was at the track recently and was a bit disappointed in the LS1 crowd. A year after I last ran my car at the track I still see people doing stupid things. There should be alot more mid 11 second cars around town these days.
As for the Type Rs... I wouldn't hesitate to use them again in any future motor I put together for my Z. One failure (not proven to be the lifter btw) should not deter anyone from going with the Comp lifters. Comp is very clear about the amount of preload needed for those lifters... it would be rare for anyone to hit that preload without adjustable rockers or custom length pushrods.
Tim
Thread Starter
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From: kuwait
Re: stock lifter vs. compcam lifter Thank you all .. <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />
i think that no difference between the GM stock lifters and the compcam lifters in the performance gains , but what about the Crane lifters? <img border="0" title="" alt="[Confused]" src="images/icons/confused.gif" />
Thank you
Adnan
i think that no difference between the GM stock lifters and the compcam lifters in the performance gains , but what about the Crane lifters? <img border="0" title="" alt="[Confused]" src="images/icons/confused.gif" />
Thank you
Adnan
Staging Lane
Joined: Dec 2001
Posts: 83
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From: Bay Area, CA
Re: stock lifter vs. compcam lifter Tim - I would recommend them again also. But I think when you start getting into bigger duration cams and high RPMs, it might be time to consider solid roller. Just my thoughts.
Re: stock lifter vs. compcam lifter screw the cranes! i had them and the tolerances were so sloppy that the valvetrain noise could be heard in another car on the freeway!
comps are good (850's) but i had a set on for 3k miles and they bleed down alot (will sound like a collapsed lifter) after WOT for a few minues.
i don't know about the comp R's, but i know that they require almost ZERO prload.
oOoly, go with the stockers, i tried them all and now i'm going back to them,they are the best fit. and if they weren't as good as the others don't you think lingenfelter would have changed them?
comps are good (850's) but i had a set on for 3k miles and they bleed down alot (will sound like a collapsed lifter) after WOT for a few minues.
i don't know about the comp R's, but i know that they require almost ZERO prload.
oOoly, go with the stockers, i tried them all and now i'm going back to them,they are the best fit. and if they weren't as good as the others don't you think lingenfelter would have changed them?
TECH Apprentice
Joined: Dec 2001
Posts: 351
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From: CA
Re: stock lifter vs. compcam lifter </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by TimZ28:
<strong>The Type-R lifters also have more preload designed into the lifter. If you look at them you will see a shim at the pushrod seat. You will need a pushrod ~ 0.050" longer if you use the Type Rs
Tim</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">What? Are you sure? I have Comp R lifters, a TR 224 cam, and my heads were milled 0.030" or so and I'm using stock length pushrods. It looks like I better get out to my garage and check my preload. So I should have less preload because my pushrods might be too short, right?
<strong>The Type-R lifters also have more preload designed into the lifter. If you look at them you will see a shim at the pushrod seat. You will need a pushrod ~ 0.050" longer if you use the Type Rs
Tim</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">What? Are you sure? I have Comp R lifters, a TR 224 cam, and my heads were milled 0.030" or so and I'm using stock length pushrods. It looks like I better get out to my garage and check my preload. So I should have less preload because my pushrods might be too short, right?
TECH Apprentice
Joined: Dec 2001
Posts: 351
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From: CA
Re: stock lifter vs. compcam lifter </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by HITMANSS:
<strong>Comp Cams lifters are made by Comp Cams, & GM lifters are made by GM. They are very similar. Ditto for the Crane lifters.
The Comp Cams R-series lifters #875-16 are lighter, designed for fast-ramp cams. However, they're not currently available.
Take your pick.</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Why aren't the Comp R lifters available? You mean just temporarily unavailable or to be replaced with another part #?
<strong>Comp Cams lifters are made by Comp Cams, & GM lifters are made by GM. They are very similar. Ditto for the Crane lifters.
The Comp Cams R-series lifters #875-16 are lighter, designed for fast-ramp cams. However, they're not currently available.
Take your pick.</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Why aren't the Comp R lifters available? You mean just temporarily unavailable or to be replaced with another part #?
Re: stock lifter vs. compcam lifter I have read somewhere (I think it was here) that Schubeck sells some re-worked Crane units that are supposed to be good in higher RPM applications.
Might want to check into it before you get your heart set on it, though...
Might want to check into it before you get your heart set on it, though...