Anyone running a solid cam?

[TurboZ24]

The flat tappets kept failing on me, so I went with the roller. The flat tappet can only take so much pressure, etc without issues, so..

[Doward]

Seriously? I didn't think they'd be any more susceptable to failure, than the hydraulics.... definetely something I'll bring up to them!

[geoffinbc]

Remember with a turbo to try and open up that LSA. Less overlap means more cylinder pressure

If you are getting a cam ground and really want to make something happen be sure they know this is for a turbo application.

[Guest]

Remember with a turbo to try and open up that LSA. Less overlap means more cylinder pressure

If you are getting a cam ground and really want to make something happen be sure they know this is for a turbo application.

QFT!

After talking with a few turbo guys and playing with DD2K, looking at some set-ups, it seems that LSAs between 112 and 116 seem to be the area for a turbo engine, especially a higher boost app.

[geoffinbc]

There is a blown impala in my GM high Tech mag with a Comp 236/244 @ .050 Cam with 114* LSA

It makes 740 HP

[Doward]

meh... got off the phone with Comp - they recommend -

16-000-5

Grind number
CV6 252-1/252-1 S 112 + 4

213/213 @ .050"

.435/.435"

112 LSA + 4º Advanced

6500rpm max power (shift point) Solid flat tappet

Seems awful close to the Crower 03065 I was ALREADY looking at, and that's off the shelf....

Calling Crower in 15 minutes (they're closed for lunch, lol)

[geoffinbc]

Fuck I called COMP like 4 times today. Its always busy. I need some info on spring retainers.

[Doward]

LOL, I know the feeling... anyone know if Crower has titanium retainers?

[bszopi]

http://www.crower.com/misc/m_cat.shtml PG. 144

As far as if any of them fit the 660, I don't know. But yes, they do have titanium retainers. I'm sure you could cross-reference something and find ones that fit.

[Fiero11]

I am running a Crain solid kit. It is in a road racer Fiero. It is 260/260 @ .050 with .591 lift and 1.6 rockers. It uses pittle valve lifters that were modifide Crain pieces. If you don't do the mods, it will burn up the cam and lifters. It also uses Crain dual valve springs and titanium retainers. It required modifying the valve stems and pockets because of the lift. Crain supplied the tool. The springs are about 20% heavier than the single LS2 springs.

[X11_STE]

Anyone mind if I throw a kinda sideways twist to this thread? I have been following this thread since it began and it seems like what I want to do with my motor. I've got a 2.8 H.O. (8.9comp.) ironhead, carb (see the sideways twist? no comfuters). I want it to spin over 7k RELIABLY. So far I've got a Holley 390 (model 4160) 4 bbl. carb and edelbrock hi rise intake. I plan on making my own headers and using sidepipes. So, will these cam's work for what I want and can I use 1.6 rockers?

[Doward]

Everyone I've talked to so far, about my camshaft, has recommended a single pattern cam, rather than a dual pattern, because of my turbo system.... Lazer cams recommended a 215/215 @ .050, .435/.435" lift, running a set of stiff Eaton lifters.

[RacerX11]

I've got a 2.8 H.O. (8.9comp.) ironhead, carb (see the sideways twist? no comfuters). I want it to spin over 7k RELIABLY.

If it is a small journal crank, I wouldn't plan on spinning it that high.

[Guest]

Agree with Marty (RacerX11), switch to a large journal block and crank, hell might as well stroke it too, while you're at it.

Anyway, I've mostly seen dual pattern cams for turbo vehicles, usually early to open on the exhaust side, early to close with lots of lift, and a longerduration on the intake side, with less overall lift. Odd that you'd be told something different.

[X11_STE]

I've got a 2.8 H.O. (8.9comp.) ironhead, carb (see the sideways twist? no comfuters). I want it to spin over 7k RELIABLY.

If it is a small journal crank, I wouldn't plan on spinning it that high.

Hehehehe, Marty, you should know me better than that! I DO plan on using the small journal block, but not the small crank. Get the idea? I will have the block machined to accept the larger crank and possibly have the crank cryro treated. No problems with high rpm's.