windsma

Ok guys let me know how i did.
these specs were close to ones suggested in a supercharging book i have.
LT1 Twin Turbo app. 7psi.
Stock bottom end for now until it blows.

cam specs. 218/224 dur. @.050 495/503 lift LSA 112
i got a really good deal on it too.
plan to change springs and 1.6 RR

if anyone has used this cam its from CompCams model no. 07-502-8 / LT1 XR269HR-12
any real world feed back would be great.

joeSS97

Its a great cam for drivability,mileage,sound,nice flat torque curve...you name it.I cant think of any downside.You will like it..You are putting it on a turbo car?

rskrause

Most turbo cams have equal intake and exhaust durations or are a bit longer on the intake side. This is different than a typical SB Chevy cam, which has more exhaust than intake duration. A typical blower cam for a centrifugal or positive displacemnt blower uses at least 10 degrees more exhaust duration. The cam you have will work fine, but will give up a few hp.

Rich

speed_demon24

Why would you buy a cam for your turbo car that was suggested in a supercharger book? I'de look into the 218/218 116lsa crane cam if I were you.

rskrause

I am thinking he was under the misunderstanding that they wanted the same type of cam?

Rich

95ttoplt1

Thats not much lift but when your force feeding maybe it doesn't matter that much??

1racerdude

Should be a good cam with some 1.8 rockers. It will make plenty of power mid range and have good street manners.
LT1's need a split cam of at least 6*

SS MPSTR

Doesn't forced induction kind of throw that out the window? I agree with ya about the separation on a N/A setup (I happen to believe that 8* is optimum on a set of really nice heads), but understood that FI changed the split 'need'. Does it matter?

1racerdude

With a turbo ya probably need more split.

mattbailey

That was the first cam that I had. It had tons of low end and drove great. I turned 12.4's @109 cam only with it.

MachinistOne

Like Rich said, street turbo motors want no split, or even a reverse split cam.

Good writeup on turbo cam selection at bottom of page:

http://www.forcedinductions.com/help.htm

That being said, I have run regular split cams in some applications where the pressure ratio and cam overlap of the setup allows it.

87lt1rx7

This is kind of off topic and, even worse, an oversimplification on cams, but I was under the impression on an NA setup if the exhaust ports flowed exceptionally well that a single duration cam would be optimal

rskrause

Yes, but good exhaust flow sufficient to warrant a single pattern cam is certainly not typical of 23 SBC heads. In general, they are "undervalved", especially on the exhaust side.

SBF 302 1.94/1.60" valves I = 12.8ci/sq.in. E = 18.8ci/sq.in. ratio: .68
BBC 427 2.18/1.88" valves I = 14.3ci/sq.in. E = 19.2ci/sq.in. ratio: .75
BBC 454 I = 15.2ci/sq.in. E = 20.4ci/sq.in. ratio: .75
SBC 350 2.02/1.60" valves I = 13.7ci/sq.in. E = 21.9ci/sq.in. ratio: .63
SBC 383 I = 15.0ci/sq.in. E = 23.9ci/sq.in. ratio: .63
Hemi 426 2.25/1.94" I = 13.4ci/sq.in. E = 18.0ci/sq.in. ratio: .74

So, a SBC, especially a stroker is dealing with a lot of airflow thorugh a small exhaust valve.

Rich

windsma

Now that i think about it, that was pretty stupid. My dad handed me the book and said the basics still apply. I dont think he has even seen a turbo.....
Damit. I should really stop listening to my dad. (old school)
any way i needed a cam, the guy was 5 min away and it was brand new. $100 off jegs price. so yeah $150 for a new compcam and i had it in my hands 10 min from the time i saw the online ad.
BTW.
book cam specs. were 224/226 .480 114 lsa
jerry magnuson developed specs for blower app. who ever the hell he is.

MachinistOne

That cam will work out just fine - at least you have (-) overlap. Use 1.6 rockers...