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'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.

 

Thanks for the interesting info...

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.

 

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.

 

Thanks... Will do

 

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.

 

Crower. They use "edge orifice" oiling and work perfectly. Set the cold lash pretty tight - .004 - .008.

You will also need different pusrods.


Charlie

 

I understand. 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.

 

Thanks for the info. I'm hoping setting a tight lash and using correct push rods will allow any Hyd camshaft to be used assuming you have adjustable valve train. As Mark indicated, I will be calling those that do it all the time for some clarification.