Another pulley exploded. - Chevelle Tech
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post #1 of 39 (permalink) Old Jan 12th, 20, 5:28 PM Thread Starter
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Another pulley exploded.

Blew up my second crank pulley. Got stranded 30 miles from home. Parts store only had one pulley available, not for my car. Not for my engine. Not even for a Chevy. But on the side of the road you’ll make anything work to get home. What are you guys using for crank pulley. I’m looking at a billet one thinking I doubt it will come apart. Got very lucky both times it didn’t take anything with it on the way out of the engine bay at 6800 rpm.
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post #2 of 39 (permalink) Old Jan 12th, 20, 6:00 PM
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rick
 
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Search crank pulleys IIRC Mr 4 Speed uses a billet crank pulley but dont remember whos, thats wild you made it home with all those nuts for spacers 👍


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post #3 of 39 (permalink) Old Jan 12th, 20, 6:27 PM
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Hank
 
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Re: Another pulley exploded.

Here's a post on a repro crank pulley that was on my friends car with pictures.
https://www.chevelles.com/forums/18-...nk-pulley.html
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post #4 of 39 (permalink) Old Jan 12th, 20, 7:42 PM
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Mr Bill
 
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Re: Another pulley exploded.

Any idea why they are breaking ? Are you running the belts too tight ? I had a stock GM pulley on my 67 Camaro that I drag raced for years and never had a problem with it. 7500 rpm every pass.
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post #5 of 39 (permalink) Old Jan 12th, 20, 7:56 PM
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Hank
 
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Re: Another pulley exploded.

Quote:
Originally Posted by BillK View Post
Any idea why they are breaking ? Are you running the belts too tight ? I had a stock GM pulley on my 67 Camaro that I drag raced for years and never had a problem with it. 7500 rpm every pass.
You answered your own question stock GM pulley compared to cheap China junk. Just think of some of these other repro parts that are on our cars that could have safety defects in them.
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71 Malibu, Cottonwood Green, 396 BBC, AutoGear M22W 4 speed, 12 bolt 3:55 posi.
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post #6 of 39 (permalink) Old Jan 12th, 20, 7:57 PM
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Re: Another pulley exploded.

I used cast Moroso crank pulley for 35-40,000 miles until I sold the car, but I wonder if you have crank runout or balancer runout or something else wrong on the front of the engine
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post #7 of 39 (permalink) Old Jan 12th, 20, 8:00 PM
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Hank
 
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Re: Another pulley exploded.

Quote:
Originally Posted by 71malibuu View Post
Blew up my second crank pulley. Got stranded 30 miles from home. Parts store only had one pulley available, not for my car. Not for my engine. Not even for a Chevy. But on the side of the road youíll make anything work to get home. What are you guys using for crank pulley. Iím looking at a billet one thinking I doubt it will come apart. Got very lucky both times it didnít take anything with it on the way out of the engine bay at 6800 rpm.
Boy I just noticed your temporary fix that looks a bit scary too.

71 Malibu, Cottonwood Green, 396 BBC, AutoGear M22W 4 speed, 12 bolt 3:55 posi.
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post #8 of 39 (permalink) Old Jan 12th, 20, 8:06 PM
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rick
 
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But it got him home 👍 and I'll bet very easy on the gas on the way home
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post #9 of 39 (permalink) Old Jan 12th, 20, 11:28 PM Thread Starter
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Ya it was pretty hairy 30 mile ride home I could just picture all those nuts going through the hood and radiator. Had it in high gear low rpm just putting along the whole way. Beats a tow any day. The first pulley was a no name cast aluminum. Lasted 5 weeks. The second one was a cast Moroso. Lasted about 4 months. Crank is a good one and true/balanced. Damper is sfi. Everything seems great. Blows my mind how lucky I’ve been that they didn’t brake anything else on the way out. Don’t want to try for 3. A billet pulley will be a definite. Is changing to a short water pump worth the hassle to run a crank pulley with less length and mass to it? Also thanks for link I’ll look into it
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post #10 of 39 (permalink) Old Jan 13th, 20, 12:08 AM Thread Starter
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https://www.ebay.com/itm/Black-Big-B...-/133162740460

I think I’m going to go for this set up. Was debating a serpentine set up, but I may eventually go to a mechanical fuel/oil pump.
Just changed my mechanical pump. Went to get a holly 12-454-30 again but apparently they are no more? Any good recommendations on a silent pump. I believe that limits me to mechanical.
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post #11 of 39 (permalink) Old Jan 13th, 20, 12:55 AM
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Why not use stock pulleys? Had mine at 7300 and they are still going
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post #12 of 39 (permalink) Old Jan 13th, 20, 1:15 AM
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Re: Another pulley exploded.

Put a WTB ad in the classifieds for some stock pulleys its better than breaking them.

John
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post #13 of 39 (permalink) Old Jan 13th, 20, 8:57 AM
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Re: Another pulley exploded.

Quote:
Originally Posted by 71malibuu View Post
The second one was a cast Moroso. Lasted about 4 months.

If that is the case I think you seriously need to look at your setup when you get it back together. The Moroso pulley should last forever in your application. Guys have been running them forever on race cars.
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Bill Koustenis
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post #14 of 39 (permalink) Old Jan 13th, 20, 9:00 AM
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Re: Another pulley exploded.

Quote:
Originally Posted by 71malibuu View Post
https://www.ebay.com/itm/Black-Big-B...-/133162740460

I think Iím going to go for this set up. Was debating a serpentine set up, but I may eventually go to a mechanical fuel/oil pump.
Just changed my mechanical pump. Went to get a holly 12-454-30 again but apparently they are no more? Any good recommendations on a silent pump. I believe that limits me to mechanical.
Have you read the description for this ebay item? It's scratch and dent sales. Not sure you'd want to put defective items on the car after the issues you've had?
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*Jeff*

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post #15 of 39 (permalink) Old Jan 13th, 20, 9:09 AM
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Re: Another pulley exploded.

Stock GM oem is the only thing you need. We've beat them and thrashed them to near 8000 rpm and they dont explode.
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