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Sharing my painful to pocket book story There doesn't seem to be a good category for this one but I'll put it here. I discovered the hard way the alternator doesn't like the higher RPMs so much. I do not have oversized or undersized drive pulley, alternator pulley is stock size so lets clear that up now. After full time automotive mechanic friend did a little searching around it seems the max recommended RPM for a stock alternator is 5600 RPM. Well I've been routinely taking my car to 6300RPM. Doesn't seem like much more does it. Well the laws that govern centrifugal force seem to disagree. My alternator fan quite literally tore apart and exploded. I can see the metal tear from the attachment point on out. If I knew how to load pictures on this forum I would. I was impressed by the amount of damage a small metal fan blade can do. Went right through the hood liner, bent the hood out ward with enough force some paint popped off, it came back down sliced right through a custom made fuse box, and then struck the high pressure steering hose cutting it. Fixing and repainting the hood ouch just ouch for the quotes I got. So anyone running high RPM's I strongly suggest measuring your pulleys and doing the math. Exploding alternator fans are not cool. |
Re: Sharing my painful to pocket book story Post some pictures or put a video on youtube |
Re: Sharing my painful to pocket book story cs130 alternator fans are prone to developing fatigue cracks because of the design of the fan and flying apart.Earlier models of Delco alternator do not have this problem. |
Re: Sharing my painful to pocket book story
Originally Posted by 383RAT
(Post 6214210)
it seems the max recommended RPM for a stock alternator is 5600 RPM. |
Re: Sharing my painful to pocket book story
Originally Posted by midias
(Post 6214259)
Post some pictures or put a video on youtube How do you post pictures to this forum? I can't figure it out. I think it might be my browser??? I don't know but I see nothing to attach pictures. I'll post pictures if someone would tell me how. I think I still have the pictures or the fan bits. |
Re: Sharing my painful to pocket book story Click the little yellow box with the gray mountains and the sun. https://cimg6.ibsrv.net/gimg/www.thi...bda45e8671.jpg |
Re: Sharing my painful to pocket book story Guess I should stop spinning my engine to 8k then...... naaah |
Re: Sharing my painful to pocket book story Had to fiddle with browser add ons. Now it works :) https://cimg2.ibsrv.net/gimg/www.thi...21e56eea5a.jpg Alt fan whats left of it. https://cimg3.ibsrv.net/gimg/www.thi...1d5a927894.jpg Custom fuse box destroyed https://cimg4.ibsrv.net/gimg/www.thi...16c6e14012.jpg Hood damage |
Re: Sharing my painful to pocket book story Yikes. |
Re: Sharing my painful to pocket book story Ok, so that's bad. I was a little fuzzy on the whole good/bad thing. (Ghostbusters) ;) |
Re: Sharing my painful to pocket book story When I was in college I had a nice 93 Z71 with a brand new motor. On the drive back from summer break my alternator threw a blade through the cowl hood... I feel your pain. |
Re: Sharing my painful to pocket book story I think you should JB weld the fan-blades so they are sticking out of the holes in the hood. Zip-tie a twisted piston rod so it shows below your K-member while you're at it. Make the most of it! |
Re: Sharing my painful to pocket book story So GM stuck on an alternator that may (probability to be determined) grenade if you routinely blast past 5600rpm? Damn. I’m flashing past 6 every second day. And I thought generally if and when these puppies went they just failed in your driveway... |
Re: Sharing my painful to pocket book story March Makes a billet Fan Blade for the GM alt.. its lighter and will take a bit more RPM.. |
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