Solid Lifter question for C5R
Thread Starter
916/795 rwhp C5R 412 YSI
Joined: May 2005
Posts: 287
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Solid Lifter question for C5R
What is involved for running a solid lifter?
I have a C5R block, LS7 heads with steel valves running dual springs with 200 lbs closed seat pressure & 480lbs open @ .630 lift, custom grind hydraulic camshaft and Jesel J2K adjustable rocker assemblies.
Is it possible to just drop in solid lifters and set the lash? I've read that solids require a solid camshaft, is that really true?
Any special work required to make solids work?
Any recommendation of brand/part? I'm targeting 7500 shift points and 7800 rev limiter. Although the enginee will be built for more.
Thx
I have a C5R block, LS7 heads with steel valves running dual springs with 200 lbs closed seat pressure & 480lbs open @ .630 lift, custom grind hydraulic camshaft and Jesel J2K adjustable rocker assemblies.
Is it possible to just drop in solid lifters and set the lash? I've read that solids require a solid camshaft, is that really true?
Any special work required to make solids work?
Any recommendation of brand/part? I'm targeting 7500 shift points and 7800 rev limiter. Although the enginee will be built for more.
Thx
Melting Slicks
Joined: Sep 2005
Posts: 3,082
Likes: 0
From: eagle mountain utah
I've heard that ramp speed is different on a hydraulic cam than a solid. I think it meant you couldn't use a hydraulic lifter on a solid cam because it opened too fast for the hyd lifter.
Thread Starter
916/795 rwhp C5R 412 YSI
Joined: May 2005
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Originally Posted by leojnknsC5
I've heard that ramp speed is different on a hydraulic cam than a solid. I think it meant you couldn't use a hydraulic lifter on a solid cam because it opened too fast for the hyd lifter.
I had my custom grind hydraulic cut to specificly open the intake and exhaust valves very fast, however the duration is long and ramps down slow on closing.
Crane Cams has the following info posted with some of their Solid lifters...
"Mechanical lifters are noisier than hydraulics. The engine must have an adjustable valve train system. Valve lash must be set, periodically checked, and maintained. Can NOT be used on a hydraulic design cam."
I don't understand the purpose of this statement, or I should say what makes it true. What about a hydraulic cam prevents its use with a solid lifter?
The only reason I can think manufactures say you can not run a hydraulic cam with a solid lifter is because cam cards for solid verse hyd are given in terms of setting valve lash (clearances - valve gap) verses preload (clearances - decending gap by pushrod). So they are almost opposites. But if you get the correct pushrod lengths and set the lash would it not work?
I know with the seat pressures and RPM's I'm looking at, Solid is the route I need to be going. I just need to see what it is going to take for me to get there. Is there any issue with using the CAM I had made. Anything else I need to worry about, etc.
Last edited by c52k1vert; Jul 18, 2006 at 11:13 PM.
Team Owner
Joined: Jul 2003
Posts: 20,474
Likes: 2
From: Detroit
Seriously - call The Vette Doctors or Cartek. They have more C5R NA experience than anyone I've seen on the forum. I think VD did a ton of cam and sheet metal intake testing a year ago or so. They should definitely be able to help you out.
Thread Starter
916/795 rwhp C5R 412 YSI
Joined: May 2005
Posts: 287
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Originally Posted by mdhmi
Seriously - call The Vette Doctors or Cartek. They have more C5R NA experience than anyone I've seen on the forum. I think VD did a ton of cam and sheet metal intake testing a year ago or so. They should definitely be able to help you out.
Le Mans Master
Joined: Oct 2005
Posts: 7,088
Likes: 1,829
From: Metro Detroit Michigan
A solid cam has a different lobe design. It rises from the base circle more slowly up to the point where the lash is taken up to avoid beating the valvtrain parts. A hydraulic cam doesn't have this "low ramp" portion to take up the lash because it doesn't need it.
Last edited by Warp Factor; Jul 19, 2006 at 06:22 AM.
Former Vendor
Joined: May 2005
Posts: 3,749
Likes: 4
From: Valencia Ca
Originally Posted by c52k1vert
What is involved for running a solid lifter?
I have a C5R block, LS7 heads with steel valves running dual springs with 200 lbs closed seat pressure & 480lbs open @ .630 lift, custom grind hydraulic camshaft and Jesel J2K adjustable rocker assemblies.
Is it possible to just drop in solid lifters and set the lash? I've read that solids require a solid camshaft, is that really true?
Any special work required to make solids work?
Any recommendation of brand/part? I'm targeting 7500 shift points and 7800 rev limiter. Although the enginee will be built for more.
Thx
I have a C5R block, LS7 heads with steel valves running dual springs with 200 lbs closed seat pressure & 480lbs open @ .630 lift, custom grind hydraulic camshaft and Jesel J2K adjustable rocker assemblies.
Is it possible to just drop in solid lifters and set the lash? I've read that solids require a solid camshaft, is that really true?
Any special work required to make solids work?
Any recommendation of brand/part? I'm targeting 7500 shift points and 7800 rev limiter. Although the enginee will be built for more.
Thx
You will also need different pusrods.
Charlie
Thread Starter
916/795 rwhp C5R 412 YSI
Joined: May 2005
Posts: 287
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Originally Posted by Warp Factor
A solid cam has a different lobe design. It rises from the base circle more slowly up to the point where the lash is taken up to avoid beating the valvtrain parts. A hydraulic cam doesn't have this "low ramp" portion to take up the lash because it doesn't need it.
Seems that if you ran a very tight hot lash that you could deal with this issue. I did not get a chance to call VR before they closed today.
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Thread Starter
916/795 rwhp C5R 412 YSI
Joined: May 2005
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Originally Posted by C_Williams
Crower. They use "edge orifice" oiling and work perfectly. Set the cold lash pretty tight - .004 - .008.
You will also need different pusrods.
Charlie
You will also need different pusrods.
Charlie
