Help me pick my roller cam specs please..

[Adrian87]

I know the turbo engine doesn't need much lift or duration but I do want to take full advantage of the Champion heads and roller cam. I know most guys say get a 206/206 but I would also like a nasty sounding idle. I will be going with the Comp Cams ductile iron roller setup.

I'm looking at either the 212/212 .504/.504 110lsa or the 218/212 .511/.504 112lsa, anyone running these or should I stick with the 206/206?

I'll be installing Champion heads with T&D roller rockers, running forged TRWs, billet caps, propane, FMIC, and my fuel system and converter should be sufficient. Let me know what you guys think.

 

[wants a tr]

212/212 thats what i have...

 

[TurboTnZ06]

I have a 210/210 110 lsa hyd billet roller and the idle is low (as in sound frequency) and mean to me, but not super lopey. It rumbles enough so that people probably think I have a misfiring $500 V6 POS with a couple of 28x9 ET Drags for no good reason as the back tires. Also using a dual ATR 3 inch stainless exhaust mated up to an ATR 3 inch stainless downpipe with no cat. The car shakes at idle, but that's partly due to my HRParts poly mount I think.

If you want a nasty idle, then get something in the 240 or 250 range Good luck with that. I'd say a 212 would be fine. I know a guy that had a 232 ish cam and went back to a 21x sized cam since you aren't gonna be shifting at 6800 rpm all the time are you?

 

[Evaddave 87gn]

Comp cAM

JUST Bought the roller 256HR, which is the 218/212, 511-504. Running a very simmilar set up. hopeing for some good results. The cam is set to pull from 1500-6200. However, spoke others who run this cam and most say it pulls strong through 6500. But i don't think I'll be opushing that hard.
DAve

 

[Sam Colalillo]

????????'s

212/212 thats what i have...

What stall, turbo and injectors are you running with that cam? I assume it is a roller cam, correct?

Your sig says "11.16@123 w/ 1.63 60ft on MT Dr's....21 lbs of boost". I am impressed. just a little more boost and you will havw to update your sig to " 10.9?? on MT Dr's.........".

 

[DonnieShort]

210/210 is great. Just about any of the ones mentioned would be very good.
BTW, to the guys running these cams ( the 21x/21x variety roller ), how is you idle vacuum warm and in park and warm and in drive?

 

[wants a tr]

What stall, turbo and injectors are you running with that cam? I assume it is a roller cam, correct?

Your sig says "11.16@123 w/ 1.63 60ft on MT Dr's....21 lbs of boost". I am impressed. just a little more boost and you will havw to update your sig to " 10.9?? on MT Dr's.........".

Stall - 3200 Precision 7 disk lock up
Turbo - Limit 67 p trim
Injectors - 75's for the me-r

roller cam with t&d roller rockers...stock manifolds..3 inch dp...stock tb and plenum...intake port matched to the heads...

that was only 18*s of timing too...

 

[MSA231V6]

212/212

What stall, turbo and injectors are you running with that cam? I assume it is a roller cam, correct?

Your sig says "11.16@123 w/ 1.63 60ft on MT Dr's....21 lbs of boost". I am impressed. just a little more boost and you will havw to update your sig to " 10.9?? on MT Dr's.........".

Similar story here... I also have the 212/212 Comp Cams roller installed on a recently re-built motor. Also with .030 TRW, GN-1 heads, billet mains, etc. With a TE45 turbo at 15# I ran a 11.33 @ 123 with only a 1.7X 60' time. The car pulled really hard and has plenty left in it. I do run a TH400 with a 4.10 rear and a taller tire, but I don't think that should make too much difference in the comparison since I did not exceed 6000 RPM during the run.

MSA

 

[Adrian87]

Holy ****! 123mph at 15psi!!! That has got to be a record, I've been thinking of the te45a, is it a good street turbo with your setup?

 

[VadersV6]

Nasty idle from a big cam equals low cylinder pressure and no hope in hell of passing smog legally. You want to retain cylinder pressure in the useable powerband, especially with a turbo motor. Keep overlap to a minimum (wide lobe separation), and you dont want the intake valve closing too late after BDC. If I ever get a cam, its going to have only 10 degrees or so above stock, which raises the powerband about 500rpm, and use lift to get the extra air in there.
Unless you want to run 8's, dont worry about trying to make your engine sound like a big cammed V8. You'll probably end up alot slower. Dont think N/A when choosing a cam. Think forced induction. Keep overlap down, duration down.

 

[Adrian87]

I appreciate the info. Which do you think I'd be better off with? ps no smog in AR, no inspection even lol

212/212 .504/.504 110lsa or the 218/212 .511/.504 112lsa or I could get a custom ground 212/212 .511/.511 112lsa cam, would that be a better idea?

I could get either one on a 112lsa, that's what you were saying is better for forced induction, correct? I'm just wondering about the lift. There must be some advantage to more lift on a forced induction motor, but I could easily be wrong. I know more about the science of a NA V8 than a FI V6. Does more intake duration have an effect on FI motors? What about more exhaust duration? Educate me.

 

[wants a tr]

i'm not the smartest guy in the book by any means..i dont have any quantative theories behind my ingenius cam selection...i pay attention to ppl's combo's and see what works and what doesnt..

sometimes using a bit of common sense goes alot farther than being over educated...

i think we've concluded the 212/212 works...atleast thats my hypothesis

 

[Adrian87]

Very true, tried and true cam profiles, I just wonder if there would be any small advantages to adjusting specs here and there..higher lift on one side, lower on another, different durations ,etc, like I said, I am more familiar with NA V8 cams that FI V6 cams..

 

[MSA231V6]

Holy ****! 123mph at 15psi!!! That has got to be a record, I've been thinking of the te45a, is it a good street turbo with your setup?

Car is strip only at this time, but I previously used the same turbo without the aluminum heads and did not have any problem on the street. At the time I was using an Art Carr 9" (non-lock) with close to 3500 stall so it would build boost easily.

MSA

 

[49-blues]

212/212 was my pic in my new motor.

 

[Mike Licht]

210/215 would be my choice
Mike

 

[BLACK6PACK]

My brother is running a 220/220 cam in his full roller motor. Hasn't had a chance to really tune it, and in about 10 passes hes got it down to 10.2 @133mph.

 

[Adrian87]

210/215 would be my choice
Mike

I've been thinking more exhaust duration would be better and a wider lsa maybe at 114, but I don't understand why on the Comp Cams the only split duration cam has more intake than exhaust. Wouldn't a wider LSA at 114 keep cylinder pressures up?

 

[Mike Licht]

That's old school turbo thinking. Newer designs are single pattern or favor the exhaust a bit, 4 to 6 degrees seems to work well. Lobe seperation is a function of duration to some extent. Example a cam with 240* @ .050 ground on a 114 may have more overlap than a cam that is 200* @.050 that is ground on a 108. You have to look at the whole picture and what the event timing is, when the opening and closing points occur.
Mike

 

[Adrian87]

Thanks for the info, Mike. You're saying the comp specs are old school turbo tech or are you referring to my statement? I can get the cam ground to whatever I want, would you care to make a recommendation?