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Old 06-21-2007, 09:18 AM
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Afr 195 Heads...cam?

Some of you might have already been replying on my thread about wanting to twin turbo my engine...that is still a very possible outcome but i have been looking into just getting real nice heads and a different cam to maybe produce somewheres up to 450 horse or so. For those who aren't familiar with my engine yet it is a 350 bored .060 over 4 bolt main SBC. It has a forged crankshaft, hyper pistons(flat tops), edelborck air gap manifold, 750 edelbrock carb, msd ignition/wires, k&n filter, flow tech headers. There is about 6000 miles on the engine. I will be changing the Heads over to the AFR 195 because the heads on there now arent anything to special...just something i had machined. What would everyone consider i use for a cam? Brand? Duration? Lift? RPM range? I would be using it as a street/strip car but still want to run it on 93 octane or so. And i have the Chevy Turbo 350 transmission built to be good up to 600HP with a Boss Hogg converter the stall is around 2500 i think...dont quote me on that though, i will have to check. Any suggestions? I am open to all of them...and links to info sites would be great! Thanks.

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Old 06-21-2007, 01:11 PM
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I'd guess that something in the range of 230 degrees duration and about .525 lift would do it. There are lots of hydraulic rollers out there that are about this range. One thing to consider with those AFR heads, the intake flow numbers are good, but the exhaust flow numbers are far better, from a practical standpoint. So, it really isn't necessary to use a dual pattern cam. What I mean is that, if you were looking at a 226/234 duration, you'd probalby get better performance from a similarly ground lobe and 230/230 duration. Assuming equal LCA, you've got the same overlap but you're taking in more air/fuel. So, you get more power and performance with similar street manners.

I've seen this recommended in some of the magazines for AFR heads, and I've played with the idea on my computer-dynos, but I've never seen any actual test results. Also, I expect your engine at this point would most likely be limited by the intake manifold. I'd guess a single plane might buy you close to 20 HP.

Hopefully one of the cam experts here will chime in. I'd like to hear what the experts here think about the single pattern idea on cams being used with exceptionally good exhaust ports.

Edit -- Comp used to grind custom cams from standard lobe profiles, for hydraulic rollers at no additional charge over grinding a catalog cam. I've heard some of the others did as welll. I'm not so sure if they still do, but I'd not be surprized.

Pat
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Old 06-21-2007, 01:40 PM
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i say contact gale banks he has a tt 350 set up

http://bankspower.com/Tech_twinturbo.cfm

Banks is developing a drag car with a 526-cubic-inch engine with four turbochargers. Admittedly, such an engine stretches the bounds of credibility. It would seem like that is the ultimate, but there’s another entire chapter to turbocharging that’s just being opened. Can you say diesels at 150-psi boost? Don’t blink. They’re not coming … they’re already here!
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Old 06-24-2007, 02:29 PM
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Quote:
Originally Posted by PatM
I'd guess that something in the range of 230 degrees duration and about .525 lift would do it. There are lots of hydraulic rollers out there that are about this range. One thing to consider with those AFR heads, the intake flow numbers are good, but the exhaust flow numbers are far better, from a practical standpoint. So, it really isn't necessary to use a dual pattern cam. What I mean is that, if you were looking at a 226/234 duration, you'd probalby get better performance from a similarly ground lobe and 230/230 duration. Assuming equal LCA, you've got the same overlap but you're taking in more air/fuel. So, you get more power and performance with similar street manners.

I've seen this recommended in some of the magazines for AFR heads, and I've played with the idea on my computer-dynos, but I've never seen any actual test results. Also, I expect your engine at this point would most likely be limited by the intake manifold. I'd guess a single plane might buy you close to 20 HP.

Hopefully one of the cam experts here will chime in. I'd like to hear what the experts here think about the single pattern idea on cams being used with exceptionally good exhaust ports.

Edit -- Comp used to grind custom cams from standard lobe profiles, for hydraulic rollers at no additional charge over grinding a catalog cam. I've heard some of the others did as welll. I'm not so sure if they still do, but I'd not be surprized.

Pat
See tech tip 2003....
http://www.iskycams.com/techtips.php#2003
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