Just an experiment...534" motor in a 69 Camaro

Took out the Comp hyd roller lifters and replaced them with a set of Crane solid roller lifters.
Motor seems to run good.
Tomorrow night we`re going to the track to see how it runs.

Will post results for those interested.

I'm also curious of the performance difference. I've heard nothing but good things about the new hydraulic rollers.

How much lash? I wonder how having to run lash will affect the car. Would you consider it over or un-cammed with the hyd. lifters?

If it is "undercammed", the solid lifters may hurt due to the lash (which I'm sure you're well aware of).

I hope you guys hit the 9's!
I'd use about .006"-.008" valve lash---DO NOT use anything like .018"--Too violent.
The best of luck to you....

UDHarold

I tried to set the lash as close as I could to .000 (cold)
After setting the valves the car was driven around just to settle in the new parts.
Then I reset them again.
1 or 2 were a tad tight 1 or 2 the same but on the loose side. Being very picky though.

Harold...we should be close to what you`re suggesting once warmed up.
We`re going to try as best we can this season to get that elusive 9 sec slip and thanks

Excuse my ignorance, I don't quite get the hydraulic roller cam with solid roller lifter combo idea. The hydro roller should be a lot less agressive than the solid, especially on the seats. But also, the hydro roller is made from a softer cam core than a solid, which is going to reduce your tolerance for spring pressure and ultimately RPM.

All of the engines I've set lash on close the lash .002-.003 when warmed up. Are you running alluminum heads? Maybe alluminum expands more causing the studs to sit higher at operating temps? All of the iron headed engines I know of clack a heck of a lot more when cold than warm. I think I'd run through them again at operating temp and set them per Harold's suggestion of .006-.008 to be safe, oil pumps don't like needle bearings, rollers, etc.

Originally posted by GRN69CHV:
Excuse my ignorance, I don't quite get the hydraulic roller cam with solid roller lifter combo idea. The hydro roller should be a lot less agressive than the solid, especially on the seats. But also, the hydro roller is made from a softer cam core than a solid, which is going to reduce your tolerance for spring pressure and ultimately RPM. Hydraulic and solid roller cams are NOT any different as far as core hardness. They are ground on the same cores...
One can be ground as say a hyd, and late rbe reground as a solid..
OEM hydraulic rollers are made on a different core that is closer to finish spec so less grindign is required.

A hydraulic cam is more aggressive at the take up than a solid. A solid usually takes up lash relatively easy, then goes into a more aggressive acceleration.
A hydraulic doesn't need any ramp to take up the lash because there should not be any.

There is power to be found using a solid lifter (flat tappet or roller) on a hydraulic profile. It will be rougher on valvetrain parts though..

Thanks for the response, regarding the ramps, I had thought it was the opposite that solids were more severe, good to learn something new. I guess the core issue I was referring to is the billet core vs cast core.

So given the explanation of ramps, I can see where a hydro roller will yield a much more agressive cam when used with a solid roller lifter. C

The big question then is - can the opposite be done also - run a hydro roller lifter on a solid lift roller cam? If this is the case, you could wind up with an incredible amount of lift in a maintenance free setup.

Originally posted by GRN69CHV:
Thanks for the response, regarding the ramps, I had thought it was the opposite that solids were more severe, good to learn something new. I guess the core issue I was referring to is the billet core vs cast core.

So given the explanation of ramps, I can see where a hydro roller will yield a much more agressive cam when used with a solid roller lifter. C

The big question then is - can the opposite be done also - run a hydro roller lifter on a solid lift roller cam? If this is the case, you could wind up with an incredible amount of lift in a maintenance free setup. Comp is trying to make their "street" solid rollers with the cast core. I would not run a cast core roller PERIOD. Solid or hydraulic.

You cannot run a hydraulic lifter on a solid cam, the very slow takeup ramps would cause a very long seat duration with no advantage in .050" duration. You would have a hard time getting it to idle. You would still not have any better lift numbers than a solid roller...

wont spring pressures be in the mix? A hydraulic roller dosent need as an aggressive spring as a solid. So are you limiting the rpms to the hydraulic cam range?

</font><blockquote>quote:</font><hr />
Comp is trying to make their "street" solid rollers with the cast core. I would not run a cast core roller PERIOD. Solid or hydraulic.
</font>[/QUOTE]All of Comps Hydro rollers are cast core. I would not run them with a solid roller for any amount of time.

What's the track time??

pdq67

OK... made 5 passes tonight they ranged from 10.33-10.37 ET
60 fts were 1.49-1.52
Here`s the last run in full:
60 ft...1.523
330 ...4.263
1/8 ...6.595 @ 105.15 MPH
1000 ...8.621
1/4 ..10.343 @ 130.75 MPH

Shifts on this pass were 6600 RPM 1-2 and 6800 RPM 2-3 just to see how it would respond.
All 4 other passes were 5800-6400 RPM give or take.

Bottom line...very encouraging considering the cool weather isn`t even here yet
graemlins/thumbsup.gif

ttt

Congrats graemlins/beers.gif

do you happen to have the "before swap" times?