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12-16-2011, 03:19 PM
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#31
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Senior Member
Join Date: Jul 2008
Posts: 739
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I sent Comp Cams some info on my car and they gave me a recommendation for Comp Cams part #35-775-8 with 236/248 duration @.050, 579 lift, and 114 LSA. Any thoughts on their recommendation? I'll be running a 2800 stall converter with 4.11 gears and 28" tires. The car should weigh ~3500 lbs with me in it.
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HP numbers are good and all, but they are like asking someone how much they can bench. What difference does it make if I can still kick your ass?
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12-20-2011, 10:23 AM
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#32
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Senior Member
Join Date: Jul 2008
Posts: 739
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HP numbers are good and all, but they are like asking someone how much they can bench. What difference does it make if I can still kick your ass?
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12-20-2011, 10:57 AM
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#33
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pain's fun, hit me again
Join Date: Sep 2009
Posts: 6,264
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Quote:
Originally Posted by joedls
I sent Comp Cams some info on my car and they gave me a recommendation for Comp Cams part #35-775-8 with 236/248 duration @.050, 579 lift, and 114 LSA. Any thoughts on their recommendation? I'll be running a 2800 stall converter with 4.11 gears and 28" tires. The car should weigh ~3500 lbs with me in it.
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Thats alot of duration for a roots engine. Thats more then what my n/a engine is, its 232/242 but with a 111*. I'd think for a non smog car with a roots you'd want a touch less duration. Then again i only have minimal knowledge of blower cams.
FWIW my Blower engine has a 218/218 114* and .562/.562. This is a centri blower/smog setup though so im not sure how it compares.
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Originally Posted by Bruce Lee
Forget about winning and losing; forget about pride and pain. Let your opponent graze your skin and you smash into his flesh; let him smash into your flesh and you fracture his bones; let him fracture your bones and you take his life. Do not be concerned with escaping safely — lay your life before him
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12-20-2011, 11:17 AM
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#34
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Senior Member
Join Date: Jul 2008
Posts: 739
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Quote:
Originally Posted by Shaolin Crane
Thats alot of duration for a roots engine. Thats more then what my n/a engine is, its 232/242 but with a 111*. I'd think for a non smog car with a roots you'd want a touch less duration. Then again i only have minimal knowledge of blower cams.
FWIW my Blower engine has a 218/218 114* and .562/.562. This is a centri blower/smog setup though so im not sure how it compares.
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The cam that's in it now has 222/232, .510/.534, and 114 LSA. Maybe I'll just stick to what I have.
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HP numbers are good and all, but they are like asking someone how much they can bench. What difference does it make if I can still kick your ass?
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12-20-2011, 11:37 AM
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#35
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pain's fun, hit me again
Join Date: Sep 2009
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Thats exactly what i was thinking when you mentioned a cam, i dont see an issue running the same duration with my lift, maybe toss a 1.7 rocker on your current cam and reap the best of both worlds.
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Quote:
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Originally Posted by Bruce Lee
Forget about winning and losing; forget about pride and pain. Let your opponent graze your skin and you smash into his flesh; let him smash into your flesh and you fracture his bones; let him fracture your bones and you take his life. Do not be concerned with escaping safely — lay your life before him
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12-20-2011, 11:44 AM
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#36
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Senior Member
Join Date: Jul 2008
Posts: 739
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Quote:
Originally Posted by Shaolin Crane
Thats exactly what i was thinking when you mentioned a cam, i dont see an issue running the same duration with my lift, maybe toss a 1.7 rocker on your current cam and reap the best of both worlds.
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So how does more duration affect a blown engine? From my understanding, I want to stay away from cams with a lot of overlap, so it doesn't bleed off boost. Wouldn't more duration just help?
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HP numbers are good and all, but they are like asking someone how much they can bench. What difference does it make if I can still kick your ass?
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12-20-2011, 11:49 AM
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#37
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pain's fun, hit me again
Join Date: Sep 2009
Posts: 6,264
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More duration usually means more overlap, like i said i'm not up on my blower cam knowledge. But if im understanding it right, less duration and overlap makes for a more throttle responsive car, have you though about a custom grind? FTI only charges $50 over an off the shelf cam that will run circles around it generally.
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Quote:
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Originally Posted by Bruce Lee
Forget about winning and losing; forget about pride and pain. Let your opponent graze your skin and you smash into his flesh; let him smash into your flesh and you fracture his bones; let him fracture your bones and you take his life. Do not be concerned with escaping safely — lay your life before him
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12-20-2011, 02:08 PM
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#38
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Senior Member
Join Date: Jul 2008
Posts: 739
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Quote:
Originally Posted by Shaolin Crane
More duration usually means more overlap, like i said i'm not up on my blower cam knowledge. But if im understanding it right, less duration and overlap makes for a more throttle responsive car, have you though about a custom grind? FTI only charges $50 over an off the shelf cam that will run circles around it generally.
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I always thought overlap was measured by the LSA, the less separation, the more overlap. The recommended cam from Comp has 114* LSA, so not much overlap.
My understanding is that more duration means you will sacrifice some low end torque, but it will have more top-end power. Given the nature of the roots blower and its instant torque, I don't think this is a real issue. But again, I'm no expert.
I wouldn't mind paying an extra $50 for a cam. I just don't know enough to determine what specs the custom grind should be.
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HP numbers are good and all, but they are like asking someone how much they can bench. What difference does it make if I can still kick your ass?
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12-20-2011, 02:38 PM
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#39
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pain's fun, hit me again
Join Date: Sep 2009
Posts: 6,264
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Ed would take care of that (fti) he usually wont give you final specs until its payed for, nature of the beast. Or for $75 i can hook you up with my cam grinder and he can regrind your cam to most any specs and he'll be able to hook you up with better knowledge.
__________________
Quote:
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Originally Posted by Bruce Lee
Forget about winning and losing; forget about pride and pain. Let your opponent graze your skin and you smash into his flesh; let him smash into your flesh and you fracture his bones; let him fracture your bones and you take his life. Do not be concerned with escaping safely — lay your life before him
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12-20-2011, 02:41 PM
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#40
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pain's fun, hit me again
Join Date: Sep 2009
Posts: 6,264
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Also, are you running a stock block?
__________________
Quote:
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Originally Posted by Bruce Lee
Forget about winning and losing; forget about pride and pain. Let your opponent graze your skin and you smash into his flesh; let him smash into your flesh and you fracture his bones; let him fracture your bones and you take his life. Do not be concerned with escaping safely — lay your life before him
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