Cam help

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Not knowing anything about your combo...I'd consider this one...

PLYMOUTH Howards Cams 718001-09 Howards Cams Rattler Camshafts | Summit Racing

With a mild combo it will be a little soft on the low end, but from a 20/25 mph roll, it'll pull like a bear to 5500/5800.
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Just saw you had a id thread for a DP Holley and notices you have PB's. As long as you can run a good timing curve, the above cam should work fine. I'd speculate 10.5/11.0" of vacuum should be available with a minimum of 14/16 deg. initial @ 850 rpm idle.

Yes, i'm just throwing out some thoughts...:)
 
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OldmanRick said:
Not knowing anything about your combo...I'd consider this one...

PLYMOUTH Howards Cams 718001-09 Howards Cams Rattler Camshafts | Summit Racing

With a mild combo it will be a little soft on the low end, but from a 20/25 mph roll, it'll pull like a bear to 5500/5800.
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Just saw you had a id thread for a DP Holley and notices you have PB's. As long as you can run a good timing curve, the above cam should work fine. I'd speculate 10.5/11.0" of vacuum should be available with a minimum of 14/16 deg. initial @ 850 rpm idle.

Yes, i'm just throwing out some thoughts...:)
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Does this apply in my case, I have a 4 speed.
 
in the absolute most basic terms, longer duration cams move the power up in the rpm range at the expense of lower rpm torque.

short duration camshafts tend to be better for low end torque and throttle response. in the upper rpm range longer duration camshafts have the potential to make more power because the valve is open longer allowing the cylinder to fill more. so at low rpm because them valves is hanging open, your compression is going in the toilet, thus you have a doggy, lazy engine till you get the R's up to where it's starting to make power.

having a 4spd and gears can negate some of this, but the fact remains that longer duration cams tend to create narrow, peaky power bands.
 
I was at a car show, and this guy was letting this car idle and it was idling smooth, and then he reached inside and said, I have a cam that I can switch profiles with a switch and he flicked the switch and all of a sudden the car it sounded like it had a big monstrous cam in it. And then he lifted the hood, and he had a little electric motor and he had a little string that was jerking the throttle and blipping the throttle and going blip... Blip....blip....dlip...
If I would have walked up and that little motor would have been on... I wouldn't have known....
 
j par said:
I was at a car show, and this guy was letting this car idle and it was idling smooth, and then he reached inside and said, I have a cam that I can switch profiles with a switch and he flicked the switch and all of a sudden the car it sounded like it had a big monstrous cam in it. And then he lifted the hood, and he had a little electric motor and he had a little string that was jerking the throttle and blipping the throttle and going blip... Blip....blip....dlip...
If I would have walked up and that little motor would have been on... I wouldn't have known....
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Maybe I should put a lumpy cam in my wife's kia...
Bahahahahahahahaha...
 
Bewy said:
Street driver with a lot of lope. 'No problem. Just look on the net for 'How to turn my daily driver into a dog...'
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I had a high school friend.
Bought a very nice Duster But was stock 318. It did have headers so had 2 pipes and muffs. Only things done other than very, very nice paint, wheels, air shocks were:
He drilled 2 holes in the 2 mufflers. And on a Friday night before going to the hang out spot Turned the timing, lowered the idle. And a block away pulled one spark plug wire. Man that car looked and sounded great.
Rest in Peace Mopar Joe.
Note he called himself Mopar Joe since he loved Mopar we joked back with SlowParJoe
My car was 3-4 maybe 5 colors of primer, but was taking the cars out at the street races.
White Trash Street Racer.
 
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j par said:
I was at a car show, and this guy was letting this car idle and it was idling smooth, and then he reached inside and said, I have a cam that I can switch profiles with a switch and he flicked the switch and all of a sudden the car it sounded like it had a big monstrous cam in it. And then he lifted the hood, and he had a little electric motor and he had a little string that was jerking the throttle and blipping the throttle and going blip... Blip....blip....dlip...
If I would have walked up and that little motor would have been on... I wouldn't have known....
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When I worked at the local Chevy dealer, we were all at the Atlanta training facility.....this was about 1989 I guess. They had a small block on a run stand that had tall valve covers with all kinda wires running through them. It was a camshaftless engine. It used solenoids to actuate the valves. They fired it off and it was just a stock sounding 5.7. Then he changed the program mid run and it sounded like a drag car. They could put any program in it they wanted. I've always wondered what happened to that project.
 
RustyRatRod said:
When I worked at the local Chevy dealer, we were all at the Atlanta training facility.....this was about 1989 I guess. They had a small block on a run stand that had tall valve covers with all kinda wires running through them. It was a camshaftless engine. It used solenoids to actuate the valves. They fired it off and it was just a stock sounding 5.7. Then he changed the program mid run and it sounded like a drag car. They could put any program in it they wanted. I've always wondered what happened to that project.
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Electric valves we have talked about in the year's past... i think yr poo poo'ed all over it and I've been told by his followers not to question him...
I thought it was a fun idea...
 
j par said:
Electric valves we have talked about in the year's past... i think yr poo poo'ed all over it and I've been told by his followers not to question him...
I thought it was a fun idea...
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Evidently GM couldn't get it perfected to the point of mass production, or I believe we'd seen it by now. That's all I can figure.
 
RustyRatRod said:
Evidently GM couldn't get it perfected to the point of mass production, or I believe we'd seen it by now. That's all I can figure.
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Cost, complexity, durability. Just because you can do it on a small scale does make it production worthy.

Plus, when you add all the above together and look at the benefit it can’t be a push.

If you did all that and spent all the money and you end up with the same (or worse) emissions or/and the power increase isn’t there then you just don’t do it.

For decades they’ve been doing pneumatic valve control is some sanctioning bodies. I know one reason why it hasn’t shown up in mass surface transportation is that the rpm needed to see any gain is so high it’s just useless.

That’s not poo pooing anything. That’s understanding what matters. Some guys have no clue (not you RRR).
 
Newbomb Turk said:
Cost, complexity, durability. Just because you can do it on a small scale does make it production worthy.

Plus, when you add all the above together and look at the benefit it can’t be a push.

If you did all that and spent all the money and you end up with the same (or worse) emissions or/and the power increase isn’t there then you just don’t do it.

For decades they’ve been doing pneumatic valve control is some sanctioning bodies. I know one reason why it hasn’t shown up in mass surface transportation is that the rpm needed to see any gain is so high it’s just useless.

That’s not poo pooing anything. That’s understanding what matters. Some guys have no clue (not you RRR).
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Yeah, it's easy to see the complexity. I saw it first hand. The conventional camshaft is just way easier for production, it lasts virtually forever as long as it's well lubricated and it's CHEAP to produce.
 
Hey guys, if it is a 10-1 motor try a 528 purple shaft if you can find one and 3” exhaust you will definitely have everyone looking twice when you idle by had one in my duster
 
junkyardhero said:
yes...

*fetches torch and begins sharpening stakes*
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Cool you can put the Torches and Stakes in the back Of a Cutlass Station Wagon with The Oldsmobile Diesel engine lots of room in them. Remember They Make a Great Shed.
 
Way off base here to the OP, but on a side note, koenginsegg is now using a cam-less engine in their suoercar that use, electro hydraulic pneumatic valves. It is an a 2 liter inline 3 cylinder, weighs 154 pounds, and makes over 600 horsepower called their, TFG engine (tiny,friendly,giant).
It can run as a 2 stroke or a 4 stroke engine, use the Otto cycle, Atkinson cycle, or miller cycle, and run on any common fuel.
Best part about it, never a flattened lobe/lifter!
Maybe it will trickle down to the masses one day
 
pat d said:
Hey guys, if it is a 10-1 motor try a 528 purple shaft if you can find one and 3” exhaust you will definitely have everyone looking twice when you idle by had one in my duster
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How would I know if it's a 10-1 engine. It's original to the car with just over 51,000 miles on it.
 
Will_H#24 said:
How would I know if it's a 10-1 engine. It's original to the car with just over 51,000 miles on it.
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68~71 340's were spec'd out with 10.5:1 compression

but a lot can happen in 50 years.... i'd get a cranking compression test and see how much PSI you're bumping and that should get you in the ball park.

unless you have a detailed build sheet with the specifics listed then you're just making a somewhat educated guess off the cranking compression psi.
 
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