crank rating on old school caddys....

[jdfenske]

what's the torque and hp rating of the old school 472 and 500s from gm at the crank ? everyone spits out wheelbase ratings, that means nothing.

might mount it on one of those screw compressors. it's supposed to have a 100hp electric, but, them's pricey, and i think they're 3phase?


and i don't know which it is, need to look at numbers on the block (never did learn how they were stamped)

i'll be surprised if it's close to 100hp, but, maybe someone here will know.

[Case 7230]

`66-`67 340hp, 480ftlbs torque. `68-`70 375hp, 525ftlbs torque. `72-`73 220hp, 565ftlbs torque.

[gmctrucks]

My best friend had a caddy with a 472 I think it was a 1974 model that car would cruise at 100 mph I remember it had a super big gas tank and it felt like a tank when it was full of gas it would sway around I think it needed shocks.

[75K30]

You are intending to run a gas internal combustion engine in place of an efficient and clean electric motor?
Used 100 hp motors are dirt cheap, and if you have a motor already, even less expensive to re-wind.
A screw compressor will not have 100% continuous run time, and this will make the gas engine a poor choice for this application. The engine will seldom run at normal operating temps making it terribbly inefficient.
The consumption of gas is going to be incredibly high. Gas prices being what they are should shy you away from this concept.
Designing a coupler for this concept is going to take more than just a set of pulleys here. We are not working with a Briggs 5 hp.
Maintaining proper engine rpm is also going to be an issue. It will have to start at idle, and if it has a direct coupling, it may never start. (cant be the torque of an electri motor) Once you do get it started, you will have to overcome the resistance of the vains under load.
Seems to me that just the fabrication involved would be far greater than just re-winding an existing motor. Even if you had to purchase a new starter for the motor, it would be far less difficult, and quite a bit more cost effective to do so.
460 VAC 3 phase is a dangerous voltage, but is very efficieant for your application.
Probably why large shops dont have gas engines running thier compressors or other equipment.

[436'd skylark]

if all you need is a measly 100 horse why not use something way smaller anyway. a 500 caddy is slightly overkill. Any 4 banger would probably do it.

You might want to figure out what rpm the compressor requires, and if the motor is capable of producing that much torque at the given rpm..

[jdfenske]

i doubt that many hp....

[jdfenske]

Originally Posted by 75K30

You are intending to run a gas internal combustion engine in place of an efficient and clean electric motor?
Used 100 hp motors are dirt cheap, and if you have a motor already, even less expensive to re-wind.
A screw compressor will not have 100% continuous run time, and this will make the gas engine a poor choice for this application. The engine will seldom run at normal operating temps making it terribbly inefficient.
The consumption of gas is going to be incredibly high. Gas prices being what they are should shy you away from this concept.
Designing a coupler for this concept is going to take more than just a set of pulleys here. We are not working with a Briggs 5 hp.
Maintaining proper engine rpm is also going to be an issue. It will have to start at idle, and if it has a direct coupling, it may never start. (cant be the torque of an electri motor) Once you do get it started, you will have to overcome the resistance of the vains under load.
Seems to me that just the fabrication involved would be far greater than just re-winding an existing motor. Even if you had to purchase a new starter for the motor, it would be far less difficult, and quite a bit more cost effective to do so.
460 VAC 3 phase is a dangerous voltage, but is very efficieant for your application.
Probably why large shops dont have gas engines running thier compressors or other equipment.

not plumbed for 3 phase and 440/460...

[75K30]

Originally Posted by jdfenske

not plumbed for 3 phase and 440/460...

I actually noticed that I typed 460 VAC, and should have typed 480 VAC, but regardless, obtaining 480 volt service, and a new panel has got to be cheaper both short term, and long term than trying to convert a gas engine.
While in rush currents will be sky high, could you get by with a smaller motor, and lower voltages?
Not expecting 120 VAC here, but what type of service do you actually have?

[jdfenske]

220/240

haha, and wont let me post unless 10 or more characters....

[75K30]

What make, and model compressor do you have?