emo-vet

hi guys,
ok i currently have a comp cam hydraulic roller cam which has not been fitted yet
i also have just brought a mini ram intake also to go with my 6 speed and 3.90 rear ratio in my L98 1991 vette !

here is is the cam specs i have,
the cam is a comp cam xfi xtreme fuel injection, #08-466-8
advance duration is 268 deg intake, 276 exhaust
duration @ .50 thou is 218 intake, 224 exhaust
lift with 1.6 ratio roller rockers ,.570 thou intake, .565 thou exhaust
113 degree lobe seperation
rev range is 1,800 rpm up too 5,800 rpm.

now there is another comp cam similarnext in line in the same family but rev range ,#08-467-8 is rated from 2,000 rpm up too 6,000 rpm,
duration @ .50 thou is 230 deg intake, 236 deg exhaust
advance duration is 280 deg intake,288 deg exhaust
lift is .576 thou intake with 1.6 ratio, .570 thou on exhaust side
lobe seperation is 113 degrees also.

so my question is should i sell the first cam and get the second cam or will my cam i have now will be ok ?

there wouldnt be much diffrence between the two is there as far as performance is concerned ?
any ideas/help would be great thanks
what should i do guys ?
regards
shae

LD85

I like the second cam or

a middle ground cam from http://www.tpis.com/index.php?module...draulic+Roller

ZZ-409 Hyd Roller:
This is the next step up great cam for a stick car
Advertised Duration 287/287
Duration @.050 226/226
Gross Lift .520/.520 (this is with 1.5's a 1.6 would be .546)
Lobe Seperation 112

emo-vet

hi larry,
how are ya!
thanks for your reply
only problem with tpis is that there cams are a bit expensive
and there lift isnt quite as much either and if the second cam choice was better, i could then proberely return first cam for a refund and go from there.
also i dont what the diffrence is between 112 & 113 degree lobe seperation ?
thanks for your reply mate, you have always been a great help too me.
regards
shae

SK.LT1

I am currently using the first cam that you mentioned in my `96 A4 with 3.07s.I am also running AFR 180 heads and Pacesetter shortie headers,and a MSD opti.This cam is a super performer in my application.

Vette_ZO619

I have run both of those cams, The first cam is better if you have a auto and the second is better for a stick car, Are you going to degree in the cam "straight up" or "advance it " Either way you will be happy with either cam depending on what your going to do with it.. The Cam I run now is 262/272 at .050 High rpm, huge stall, but I drag race it, What do you plan on doing?

vader86

The difference in 112 and 113 LSA is not anything to really worry about, its the duration@050" that I really look at. The TPiS cam is still in-between those two.

The 2nd cam is going to make alot more power if you have the heads to feed it at high rpm. If you have D-port heads, they wont be able to feed this cam to its potential, its idle will be choppy and I dont think it could ever pass a sniffer. I would pick this cam if it were my car, but then I wouldnt put it in until I had the heads to feed it.

The first might lope a bit at idle but is doable with stock heads (though it would really want bigger or ported heads). It could pass emissions if tuned properly.

Both need a custom chip done.

tequilaboy

Next time around, I'd be tempted to go with a David Vizard style cam ground on a 108 or tighter LSA.

His cam selection methods are based more around picking the appropriate overlap and LSA for the application, rather than focusing on duration.

I wonder sometimes if we are all missing the boat running 112+ LSA camshafts, even though they are commonly recommended for EFI engines.

These days, I think nearly anything can be tuned to run reasonably well even with EFI.

There's an interesting thread on overlap going on in the Scan and Tune section.

Vette_ZO619

Yea I agree with you, but you have to remember that the tighter the lobe the less vacuum for brakes and EFI set ups like the wider lope sep alot better, If it had a carb on it and it was a drag car, I would drop it down to 104 to 106 if it was a NA motor! But if your talking power adders Tighter is not better..

LD85

Also the Miniram is a very short runner, my concern would be the reverb on the MAF sensor.

I agree it would be worth a try on a longer runner system though

fun Pain

I have the CCA-08-306-8 (firebird) Holley Stealth Rammed

http://store.summitracing.com/partde...8&autoview=sku

I have heard but haven't tried it but the 08-503 has a little newer design that makes just as much power a little lower in the rpm band

http://store.summitracing.com/egnsea...s=P%5FRank%7C0

Mine is a little more aggressive (with @.50 230 int./244 exh.) then your picks, the little extra on the exhaust side helps with power adders, and helps out the exhaust ports, I don't know what your exhaust is like but if it's anything like other vettes this would help.

The bird is heavier and with only a 2400 stall (84 vette 12"), as well as only 3.27 rear gears, The Cam is a great performer,

it would be even better in a lighter, geared, Mini Ram (much like HSR) car such as yours

OH it sounds awesome...
and it idles nicely around 600-700 and would kick but with 3.90s

so if you like the bigger one of your chooses, and can tune a computer your self go with it... you won't be disapointed

with the maf statements, look into swaping to 730-727 computer.

http://www.eecis.udel.edu/~davis/z28/ecm_swap_730/

emo-vet

hello guys,
thanks for your help and comments.
cheers
regards
shae

SK.LT1

And your choice is???

emo-vet

hi, ok my choice is going with the second comp cam mentioned!
so now i have the first comp cam i mentioned for sale if any one is interrested for $ 250.00.
cost me $ 299 about 3 month ago.
brand new still,in the box.
i will pay the shipping also...
please pm if any one interested.
cheers
thanks