4 grove crank pully for SBC

Bennyt · Mar 8, 2022

SirRobyn0 said:
...I don't want to go serp belt. For one thing it's new pulleys and brackets all the way around and costly. For another thing to me it looks out of place on an old rig, but.....

I converted my son's truck to a serpentine system off of a '90 Suburban. Much simpler and more reliable than a V-Belt system. I have about $250 into it including purchase price, pulleys, alternator, PS pump, pulleys, belt, idlers and powdercoat. Running an AC delete pulley until I finish the trcuk and add AC but it came with a nice AC compressor. The only downside is I want a small 142/144 Roots for it and they won't work with serpentine. I'll have to go centrifugal when the time comes.

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SirRobyn0 · Mar 8, 2022

Bennyt said:
I converted my son's truck to a serpentine system off of a '90 Suburban. Much simpler and more reliable than a V-Belt system. I have about $250 into it including purchase price, pulleys, alternator, PS pump, pulleys, belt, idlers and powdercoat. Running an AC delete pulley until I finish the trcuk and add AC but it came with a nice AC compressor. The only downside is I want a small 142/144 Roots for it and they won't work with serpentine. I'll have to go centrifugal when the time comes.

Thanks for the pics. I understand the pros of going to all serp belt, but I'm not interested in going that route. Like I said I'd go to serp for alt only, if that turns out to be more realistic way of improving the alternator belt setup.

AuroraGirl · Mar 8, 2022

SirRobyn0 said:
Thanks for the pics. I understand the pros of going to all serp belt, but I'm not interested in going that route. Like I said I'd go to serp for alt only, if that turns out to be more realistic way of improving the alternator belt setup.

on your reply, I know what youre trying to do. what im saying is I wonder if those old "add" on pullies gm used for swp can be used with LWP pulleys, because if so, I have a few of them. On the lwp pullies, like I said you can buy a machined 4 groove pulley new, and if the belt size isnt different than current ones groove wise, you just need to space it the right amount. to line up to your other stufff. and can you show a pic of it rn that could help

AuroraGirl · Mar 8, 2022

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heres that pic of my ac compressor on buick I found that shows what i described before. the belt is larger to compressor and rides past the alt there, not helpful for your needs just saw the pic and remembered lol

SquareRoot · Mar 8, 2022

This is like deciphering the mystery of the Egyptian Pyramids. Spend $50 at the junkyard and swap to a ONE belt serpentine system and enjoy the simplicity of the 21st century.

SquareRoot · Mar 8, 2022

SirRobyn0 said:
So this started as a side discussion in another thread. Someone wasn't happy that we'd derailed from hub caps to crankshaft pully so I said I'd start a separate thread. Now I'm going to tag everyone that was in on it, but anyone is welcome to join. @AuroraGirl @AyWoSch Motors @bucket

So IIRC the 4 grove crank pully was used on medium duty SBC trucks where they ran 2 belts over the A/C & P/S as well as 2 belts for the Alt. The broken one I have sitting at the shop has a steel inner pully and a cast iron outer pully.

I'm running out of time today to get a picture of it but will try to make it happen before I call it a day.

I do not know why they did two different materials like this.

Ayden, if you have one in your pile I'd be interested and there is no hurry at all. But I'd be interested in discussing buying one from you.

Taylor, you were saying?

Thanks for coming to the new thread!

I wasn't unhappy, it just wasn't right to the intent of the OP. Now, how about them gas prices?

SirRobyn0 · Mar 8, 2022

AuroraGirl said:
on your reply, I know what youre trying to do. what im saying is I wonder if those old "add" on pullies gm used for swp can be used with LWP pulleys, because if so, I have a few of them. On the lwp pullies, like I said you can buy a machined 4 groove pulley new, and if the belt size isnt different than current ones groove wise, you just need to space it the right amount. to line up to your other stufff. and can you show a pic of it rn that could help

IDK, I'd image it may well be possible, but frankly don't know.

AuroraGirl said:
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heres that pic of my ac compressor on buick I found that shows what i described before. the belt is larger to compressor and rides past the alt there, not helpful for your needs just saw the pic and remembered lol

Yes, thank you I did not fully understand what you meant earlier.

SirRobyn0 · Mar 8, 2022

SquareRoot said:
This is like deciphering the mystery of the Egyptian Pyramids. Spend $50 at the junkyard and swap to a ONE belt serpentine system and enjoy the simplicity of the 21st century.

I've already mentioned why I do not want to go to serpentine system. Yes I agree the serpentine belt system is better in nearly all ways to v-belt and is less finicky. But it's not what I want. I have enough modern, in my day job at the shop and on most of my other rigs. I wanna keep my square old school, and I'm enjoying the conversation.

SquareRoot said:
I wasn't unhappy, it just wasn't right to the intent of the OP. Now, how about them gas prices?

Regardless you were right. It's one thing for to go down off topic in a repair or tech thread it's another thing on a sales thread.

AuroraGirl · Mar 9, 2022

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so this is 85 or 86 with smog and ac and its from @iamtherealJayy i think. I got these pics here im 97% sure.

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here was my few things, the water pump pulley isnt the best atm but I know based onw what I had it was either space everything out to meet a crank pulley or have everyting match mostly minus some misalignment from alt to waterpump(but alt and crank ok I think)

SquareRoot said:
This is like deciphering the mystery of the Egyptian Pyramids. Spend $50 at the junkyard and swap to a ONE belt serpentine system and enjoy the simplicity of the 21st century.

some things are fun to overcomplicate or do for novelty/alternative reason that outweighs

iamtherealJayy · Mar 9, 2022

@AuroraGirl first pic is mine yes, I have smog pump but no ac lol and it’s an 87. I’ll read up on this thread see if I know anything beneficial

iamtherealJayy · Mar 9, 2022

My crankshaft pulley only has 3 grooves to my knowledge lol there’s only three belts, but I do have a load of parts laying around I can checkout on my lunch break later. If I find anything that might stir your curiosity I’ll post about it. My truck is tbi and has 2 vbelts and a serpentine for alternator.

SirRobyn0 · Mar 9, 2022

iamtherealJayy said:
My crankshaft pulley only has 3 grooves to my knowledge lol there’s only three belts, but I do have a load of parts laying around I can checkout on my lunch break later. If I find anything that might stir your curiosity I’ll post about it. My truck is tbi and has 2 vbelts and a serpentine for alternator.

Right, so that system with 2 V's and one serp came about with the TBI. Make sense. I'd need to eventually come up with 3 pullies to do that, but it would be far more doable in my opinion than going full serp.

Thanks for reposting the pics @AuroraGirl

More later I gotta get off to work.

iamtherealJayy · Mar 9, 2022

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I stand corrected, my tbi has a v and a serpentine, the water pump has three grooves.

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This is my 1978 Chevrolet k10, it had factory air, the crank has one piece(smaller) with two grooves and a larger pulley on front.

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Finally, this is a 70’s c10 parts truck with no options at all, it has two grooves on the crank pulley. I have a plethora of small block parts in a semi trailer I can go look for a pulley for you if needed

AuroraGirl · Mar 9, 2022

SirRobyn0 said:
Right, so that system with 2 V's and one serp came about with the TBI. Make sense. I'd need to eventually come up with 3 pullies to do that, but it would be far more doable in my opinion than going full serp.

Thanks for reposting the pics @AuroraGirl

More later I gotta get off to work.

Yes especially since the belts are all turning all accessories the same direction and the tension is old way, and the belts aren’t fancy design like serp. They would fail if ran like one

SirRobyn0 · Mar 9, 2022

I'd need one more V-belt than Jacob has in order to maintain 2 V belts running the A/C & P/S so I'd need this crank pully.

March Performance 4021-08: Crankshaft Pulley for 1985-1987 GM GM Camaro, Firebird, Monte Carlo, Truck 305-350 ci - JEGS

Get the Best Performance with March Performance Crankshaft Pulley for 1985-1987 GM GM Camaro, Firebird, Monte Carlo, Truck 305-350 ci 4021-08 parts at JEGS. Shop Now at the Guaranteed Lowest Price!

www.jegs.com

I'm on my work computer and can't get the image to come over but it's just like Jacob's, but with 2 v groves.

On a quick websearch I don't find the serp / v belt pully for the water pump.

As a side note the 4 grove crank pully is completely unavailable in the aftermarket as I have looked previously.

Another note, I currently have a functional air pump and would prefer to keep it.

4 grove crank pully for SBC

Bennyt

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March Performance 4021-08: Crankshaft Pulley for 1985-1987 GM GM Camaro, Firebird, Monte Carlo, Truck 305-350 ci - JEGS

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