Launch

I've got a new in box hydraulic roller cam for ls1 (it's the old thunder racing t-rex spec exact grind, by comp cams)

Can I run this cam as a solid roller setup? Has anyone used a hydraulic roller ls1 comp cam and converted the valvetrain to solid?

The reason being is, id shift my old 232/595 head/cam 346 ls1 at 7200rpm and did 120mph in the 1/4 n/a in a heavy 3500+ lb car.

This t-rex size cam im fitting now in another 346 ls1, is a fair bit bigger than the above. So I think i can gain ET by shifting at high 7000rpm's, with all the other required engine upgrades to handle that rpm of course.

I've already got this hydraulic roller cam here, so im thinking of just running it as a solid roller.

96capricemgr

iTrader: (1)

Solid roller cams have a start and stop to the ramps designed to gently lift and set down to lifter.

I would just buy an aftermarket hydraulic lifter.

A.R. Shale Targa

iTrader: (2)

You can do that and gain rpm stability with the solid lifter, however the lash now knocks some degrees of lobe timing off making the engine think it's similar to a mid 230's hydraulic. Perhaps you want that IDK, but you'll obviously need an adjustable rocker arm and if an all aluminum application then setting the cold lash about .006"-.008" should put you about .016" or so hot. You may want to consider the 10mm bolt upgraded YT stuff that Mamo has been pimping for more stability at the valve.

Launch

I already figured i'll make up for the lash by higher ratio roller rockers. Im just wondering if anyone has actually done what im asking , if the cam lobes in the comp cams between hydraulic/solid roller cams have any differences or not

Launch

but i wonder if the solid roller lifters can't tell the difference.....

i guess i can just buy a solid roller camshaft, or try this one as a solid setup and see what happens

A.R. Shale Targa

iTrader: (2)

a higher ratio rocker combined with that aggressive lobe profile will be extremely difficult to control at high rpms which is where it's gonna want to go.
push rods and valve springs are going to need to be top shelf ****...you skimp on any one part of that equation and the dyno graph will resemble diahrea.....

96capricemgr

iTrader: (1)

Which brings us back to just buy a decent hydraulic lifter. Save a fortune on springs, rockers, bigger pushrods.

93Polo

iTrader: (5)

The BBC guys were playing with solid rollers on a hydraulic roller lobes. You may find this interesting:

http://www.chevelles.com/forums/showthread.php?t=299946

I also found it interesting that one of the respected cam designers used solid roller lifters on a hydraulic lobe in his marine applications. It can reduce weight and create a stable valve train for sustained RPM.

9sectruck

iTrader: (9)

Im running a liljohn stg3 turbo cam with solid lifters set at .008 valve lash and so far so good. valve train seems to be very quiet... will be doing some testing this coming month.