Hyd roller cam with a solid lifter

[93cobra1928]

I was talking with a buddy the other day about this and he says it will extend the RPM range doing this. He got this info from a machinist named Tommy in Birmingham. I could see doing this in a non roller block to keep from buying the conversion lifters but I'm skeptical of the perfprmance benefit.

Post up your opinion on this :popcorn:

[coupe]

I would agree...especially with the right hydraulic roller (ie: something fairly aggressive). The solid allows a bit more precise control of the valve actuation and events. Lash changes would allow a somewhat "tunable" cam too. Same advantages would apply, even if they're technically "hydraulic" lobes.

And Tommy Sadler is probably the gentleman. Been doing this stuff for a while so I would probably take his word for it. He builds engines too, not just a machinist. :nice:

[93cobra1928]

Tommy Sadler is his name, my oldtimers was kicking in.
The discussion was about agressive ramp rates on the hyd roller and using it in an older block.

I wonder if there would be an oiling concern on a roller block due to the extra height of the lifter bore?

[coupe]

Sure oiling is of concern... the lifter still feeds the pushrod and rocker arms.

Have to make sure the lifter oiling passage intersects the oil passage in block. :nice:

[waypastcrazy]

Can be done as long as the cam is billet. There were some comp cams that got out that were not billet in the late 90s I believe. And they caused some dipping on the cam lobes. Which cause some serious issues that are hard to chase down if you don't know what the symptoms are. Lol.

[03slobra]

this may sound stupid but what about hyd. lifters with a solid roller cam and solid roller valve springs.or hyd. cam and lifters with solid roller valve springs,just curious

[93cobra1928]

I don't think a hyd lifter will stand up to the pressure of a
spring for a solid roller shaft. That would eliminate the "cushion"
provided in the lifter and lead to failure IMO

[coupe]

correct.

Seen some high-rev hydraulic setups use springs that were over 200# on the seat, and that's starting to get into the solid realm...but the spring-rate and open pressure also plays a big factor. The lifters for these are usually heavily modified.

[EHardy1971]

I remember seeing an article in MM&FF back years ago, about making a stock hydraulic roller lifter "Semi-solid", by taking them apart, and stacking washers inside of them. It was supposed to do the same thing.