Best cam duration for a 383?
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From: Santa Monica CA
Best cam duration for a 383?
Hi all,
I'm putting together my design for a relatively conservative 383. Something that I can upgrade in the future but that will get me going for now. What kind of duration should I go for in a cam? I'm trying to emphasize power at low rpm's, as the 383's are known for, so I would think to go pretty low. Thoughts?
Thanks - Dave.
I'm putting together my design for a relatively conservative 383. Something that I can upgrade in the future but that will get me going for now. What kind of duration should I go for in a cam? I'm trying to emphasize power at low rpm's, as the 383's are known for, so I would think to go pretty low. Thoughts?
Thanks - Dave.
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From: Santa Monica CA
I assume that's the RPM range where torque is above or equal to 80% of it's max... ?
I'm not going to race it, so I'd like for the torque to be good off the line. Say idle-5000?
Dave
I'm not going to race it, so I'd like for the torque to be good off the line. Say idle-5000?
Dave
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From: eville in
Originally Posted by humiliategravity
I assume that's the RPM range where torque is above or equal to 80% of it's max... ?
I'm not going to race it, so I'd like for the torque to be good off the line. Say idle-5000?
Dave
I'm not going to race it, so I'd like for the torque to be good off the line. Say idle-5000?
Dave
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From: Santa Monica CA
Originally Posted by comp
with a 383 i'd have it pull to 55-5800 rpm's, that's where i'm going for my truck 383
http://www.chevyhiperformance.com/te...be/index2.html
Theory holds that a 383 should be able to handle a higher duration cam, but from what I've seen the optimal is 215-225 at .05, erring to the low side.
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383
Your intake type and emission compliance dictates how much cam to use. Then of course cam type.
232/240 @ .050 112 lc in roller cams make a 383 a TQ monster
232/240 @ .050 112 lc in roller cams make a 383 a TQ monster
Drifting
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From: FRANKLIN GA
With a correctly built 383 your gonna make torque everywhere. I'm running 236 @ .50 and mine make so much torque on the low side it just blows the tires off. I even tried to calm it down with a 2" spacer under the carb, it helped a little but not much. Next cam will be in the 245 250 range just to help get some traction.
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From: Santa Monica CA
Thanks guys. Both of you have advocated to use a cam in the 230's... I was thinking lower.
What could I expect if I used a 215/213 or a 225/224 at .05? Those are the ones I'm deciding between. If I go for a lower duration camshaft, the engine will idle a little better and I'll get better fuel economy (theoretically). Eddie, that's the first I've heard about too much torque
Does the drivability of the car really suffer?
What could I expect if I used a 215/213 or a 225/224 at .05? Those are the ones I'm deciding between. If I go for a lower duration camshaft, the engine will idle a little better and I'll get better fuel economy (theoretically). Eddie, that's the first I've heard about too much torque
Does the drivability of the car really suffer?
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From: Fountain Hills AZ
Originally Posted by humiliategravity
Thanks guys. Both of you have advocated to use a cam in the 230's... I was thinking lower.
What could I expect if I used a 215/213 or a 225/224 at .05? Those are the ones I'm deciding between. If I go for a lower duration camshaft, the engine will idle a little better and I'll get better fuel economy (theoretically). Eddie, that's the first I've heard about too much torque Does the drivability of the car really suffer?
What could I expect if I used a 215/213 or a 225/224 at .05? Those are the ones I'm deciding between. If I go for a lower duration camshaft, the engine will idle a little better and I'll get better fuel economy (theoretically). Eddie, that's the first I've heard about too much torque
Does the drivability of the car really suffer?
Drifting
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From: FRANKLIN GA
humiliategravity, I forgot to mention that mine isn't on conservative side.
Yes the drivability suffers if I ever get caught in the rain. Even trying to be light on the gas pedal it will spin from a dead stop, and between gear changes it breaks traction. I have to be very careful. But now on dry pavement it is a hoot to drive. Pulls very hard. Scares all my friends. Kinda reminds me of a dirt bike powerband. I love it.
If your worried about gas milage get a 700 or 200r4. and some good gears in the rear (3.73's) I get about 17-19 mpg on the highway, in town is a diffrent story about 10-12
Mine idles fine at 750 in park and about 625-650 in drive and it sounds awesome.
Yes the drivability suffers if I ever get caught in the rain. Even trying to be light on the gas pedal it will spin from a dead stop, and between gear changes it breaks traction. I have to be very careful. But now on dry pavement it is a hoot to drive. Pulls very hard. Scares all my friends. Kinda reminds me of a dirt bike powerband. I love it.
If your worried about gas milage get a 700 or 200r4. and some good gears in the rear (3.73's) I get about 17-19 mpg on the highway, in town is a diffrent story about 10-12
Mine idles fine at 750 in park and about 625-650 in drive and it sounds awesome.
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From: eville in
Originally Posted by EDDIEJ82
humiliategravity, I forgot to mention that mine isn't on conservative side.
Yes the drivability suffers if I ever get caught in the rain. Even trying to be light on the gas pedal it will spin from a dead stop, and between gear changes it breaks traction. I have to be very careful. But now on dry pavement it is a hoot to drive. Pulls very hard. Scares all my friends. Kinda reminds me of a dirt bike powerband. I love it.
If your worried about gas milage get a 700 or 200r4. and some good gears in the rear (3.73's) I get about 17-19 mpg on the highway, in town is a diffrent story about 10-12
Mine idles fine at 750 in park and about 625-650 in drive and it sounds awesome.
Yes the drivability suffers if I ever get caught in the rain. Even trying to be light on the gas pedal it will spin from a dead stop, and between gear changes it breaks traction. I have to be very careful. But now on dry pavement it is a hoot to drive. Pulls very hard. Scares all my friends. Kinda reminds me of a dirt bike powerband. I love it.
If your worried about gas milage get a 700 or 200r4. and some good gears in the rear (3.73's) I get about 17-19 mpg on the highway, in town is a diffrent story about 10-12
Mine idles fine at 750 in park and about 625-650 in drive and it sounds awesome.
