[Firebob]

Thinking about pulling the hyd roller and sliding in a solid FT cam. Never had one before. I like to experiment. Anyways I was wondering how strong the springs should be to spin to 6K without giving up? Would I need restrictors too?

[GOAT WHORE]

Have you thought about running a hybrid, with solid rollers on your hydraulic cam?

[steve25]

It depends on the cam as some opening Ramps on a flat tappet cam are more aggressive than your hydro roller and as such may need more spring pressure even though your current hydro lifters are a tad heavier!
What springs are you running now?

[Tim Corcoran]

depends on cam, post cam specs and depending on what you have now might be able to use the same springs if seat pressure is not too high

[HWYSTR455]

Look at the cam card you have for the cam you have now to get an idea of what's in there spring-wise. Then look at solid cams' and look at the cam cards for them, pick one that your current springs will work with. If there isn't many or there's none, you will have to change the springs.

Don't need restrictors, and even so, many solid lifters have restrictions built in.

.

[gtofreek]

Like Tim said, post cam specs[duration @ .050" as well as advertised, this will give an idea of how aggressive the lobe is and what spring would be good], and that will help a bunch.

I talked to Harold Brookshire about the whole solid rollers on a hydraulic roller cam, and he said that makes absolutely no sense to him at all and he wouldn't do it. He said the solid roller lobe will perform better all the way around as that's what it is designed for. Not the hydraulic roller. All you gain is less lash, and getting on the lobe a little sooner, but loose it on the rest of the lobe.

[Firebob]

Adv. dur 266/276. 236/248@.050 .485 lift w/1.5

[gtofreek]

That's a fast lobe so I would find something that will get you 150-160 lbs. on the seat, minimum, and 375-400 lbs. open, minimum. Break cam in with inner springs pulled out, then re-install after break-in.

You sure that's not a solid roller cam? I ask because the major intensity[difference between duration at .050", and advertised] of that cam is very low, indicating a solid FT lobe faster than anything I have ever seen. It's more like an aggressive solid roller lobe.

What brand cam?

[grandville455]

I understand the solid roller deal, but I have to say Dave's hybrid setup works, I have been very pleased with the performance I have with really no high spring pressures, I would like to see a back to back test of a solid roller cam and the hybrid. My car performs very well for its chosen components. I see cars with a lot more , not running much faster

[Tim Corcoran]

Robert
Are those the specs for the new FT solid cam or for the hyd roller you have in there now? Usually the cam supplier will have recommended open and closed spring pressures for their cams. Sometimes for a mild hyd roller the cam specs would be very similar to a fairly potent solid FT cam

[HWYSTR455]

Yup, those spring recommendations are outlined on the cam card.

.

[Ed Fitzgerald]

These specs appear to be for the solid roller cam (used) for sale in the parts section.

[Firebob]

Yes, I was curious about the springs needed for the solid 236/248 cam posted in the FS section by Karch. He attached a pic of the cam card as well and it does appear to be a FT cam not a roller.
Another question I had was about the lifters. If I bought a new set for this cam and then after finding out I didn't like it, can I pull the cam and drop another in and use the same lifters? With hyd cams, it always seemed suggested that once you use lifters on a cam that you weren't able to use them for any other. Is it the same for solid cams as well?

[gtofreek]

You cannot re-use flat tappet lifter, whether solid or hydraulic, on another cam. They shouldn't even be re-used on the same cam, in another block, because block variations can put the lifter riding in a slightly different location and setting up a new wear pattern.

I have never seen a flat tappet cam with only 28 and 30° major intensity. Even the VooDoo lobes[which are some of the quickest lobes, if not the quickest, out there] are not that fast. They are only 33°-35°. The fastest solid roller full drag race profiles are 28°, so I don't see how a flat tappet can be that fast. I guess we'll see.

If that is a solid roller, you better be more in the 250 lbs. on the seat, to 550-600 lbs. open, minimum.

Hopefully it's a new cam if it's flat tappet.

[mchell]

Originally Posted by Firebob

Adv. dur 266/276. 236/248@.050 .485 lift w/1.5

pretty mild specs for a solid FT if that's what it is.....my opinion, If you're gonna try a solid, ramp up the duration and lift ..... recommend running a cool face lifter with any solid....

[Firebob]

Yeah, not very big but it's only a 400.

[Tim Corcoran]

Hy-Lift Johnson also makes a solid FT lifter with an EDM hole to oil the face of the lifter and made in the USA.

[Firebob]

Tim, What vendor would I get those from? Do you have a link? Thanks.