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*** Special on Magnuson Heartbeat this Fall **

 
Old 07-05-2019, 08:48 PM
  #2641  
Turbo6TA
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Originally Posted by CI GS View Post

If only I had a real blower...
Stop that !
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Old 07-10-2019, 07:07 PM
  #2642  
Chiselchst
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Question for ya'll regarding a Mechman alternator - was the Mechman alternator housing/bolt placement location in the exact same spot as the stock OEM alternator? My Mech 250amp has a bigger housing (dog ears wider apart), requires a larger belt, and is a really tight fit next to the radiator overflow tank.
We compared mine with another Vette that had one - my MM is definitely larger than the other Vette's Mechman...
Is this what everyone experienced too? I'll talk with Bret, was just curious what others experienced. Perhaps the 170 amp is smaller?
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Old 07-10-2019, 08:16 PM
  #2643  
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I have the 170 and it was an exact replacement size wise.
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Old 07-11-2019, 03:56 AM
  #2644  
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Yeah, my MM 170 amp was, if anything, slightly smaller and easier to reinstall that the stocker. Didn’t realize that the 250 amp was bigger, but that makes sense.
But I don’t get why it would need a longer belt, if the pulley is the same size, unless it’s offset outboard a bit?
Look at the bright side Mitch, now you can start bragging on here that, “My Mechman is bigger than yours!
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Old 07-11-2019, 04:52 PM
  #2645  
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Thanks guys!

Sammy, I would brag that way, but my Mechman is on the bench!

Finally talked with Bret! Man, what CS! Great guy, absolutely just a great guy...He did say his pulley is a tad smaller (to get higher speed/amps at idle), so the belt will have slightly more room. I've already ordered a slightly smaller belt!

Yeah, my housing was a larger size. So I just bought one from Bret, and will deal with the other to the best outcome. He walked my through reading belt sizing and much more, spent 45 minutes on the phone with me! Felt bad to take so much of his time, but he insisted,,,


Originally Posted by Sphurley View Post
I have the 170 and it was an exact replacement size wise.
Originally Posted by CI GS View Post
Yeah, my MM 170 amp was, if anything, slightly smaller and easier to reinstall that the stocker. Didn’t realize that the 250 amp was bigger, but that makes sense.
But I don’t get why it would need a longer belt, if the pulley is the same size, unless it’s offset outboard a bit?
Look at the bright side Mitch, now you can start bragging on here that, “My Mechman is bigger than yours!

Last edited by Chiselchst; 07-11-2019 at 04:53 PM.
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Old 07-11-2019, 05:19 PM
  #2646  
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Originally Posted by Chiselchst View Post
Thanks guys!

Sammy, I would brag that way, but my Mechman is on the bench!

Finally talked with Bret! Man, what CS! Great guy, absolutely just a great guy...He did say his pulley is a tad smaller (to get higher speed/amps at idle), so the belt will have slightly more room. I've already ordered a slightly smaller belt!

Yeah, my housing was a larger size. So I just bought one from Bret, and will deal with the other to the best outcome. He walked my through reading belt sizing and much more, spent 45 minutes on the phone with me! Felt bad to take so much of his time, but he insisted,,,
Glad to hear that youíre getting it sorted. Bret is absolutely a fantastic guy to deal with. Iíve really had many good experiences with many vendors that I found on here, including Bret, BTR, IW, DSX, Hinson, and CCA, to name a few. And without help from people like Carson, Jody, Christopher aka ďsubfloorĒ and a bunch of others, including, hell yes, even that oldmotorhead guy (donít tell him I said so though), I wouldíve had to pack it up years ago.
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Chiselchst (07-12-2019)
Old Yesterday, 07:12 PM
  #2647  
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Did anyone get a shorter serp belt when they put their Mechman alternator on?
I've purchased a couple of smaller belts, and a belt measuring tool. Am I wasting my time trying to get the *exact* belt fit I had from CPR?
Pulley is like 1/4" smaller, LOL...
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Old Today, 12:57 AM
  #2648  
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Originally Posted by Chiselchst View Post
Did anyone get a shorter serp belt when they put their Mechman alternator on?
I've purchased a couple of smaller belts, and a belt measuring tool. Am I wasting my time trying to get the *exact* belt fit I had from CPR?
Pulley is like 1/4" smaller, LOL...
I didnít notice a difference in diameter with the Mechman I installed, but then again, I really didnít look, tbh.
As to whether you need a smaller belt, that will depend on belt stretch and the amount of range your tensioner has with the current belt. Thereís only one way to tell - put the belt on and see where the tensioner is sitting. If youíre running a regular belt, you want it nearly resting on the stop at fully closed (compressed). If itís an RPM belt, you want it somewhere in the middle of the tensionerís range, because those belts are so damn stiff that when you ease off from a WOT pull, they tend to snap back and slam the tensioner against the stop, which either upsets and dumps the belt and/or destroys the tensioner (and sometimes other **** as well - ask me how I know). If it looks good, then just test it and see if you get belt slip. With the limited range of the stock tensioner, getting the right length belt on there is critical.
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Old Today, 01:11 AM
  #2649  
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Speaking of tensioners, I’m not sure if I ever posted a pic of the AC Delco tensioner that I’m running now, which seems to be holding up better than the previous Dayco versions, after destroying two of those. Basically I crossed referenced the part # of the Dayco unit and it gave me an AC Delco number equivalent, and I took the chance and ordered it from Rockauto for like $48. I had to devise a stop for this as well, since it has the same wide range of motion of the Dayco. It was much easier to do a proper stop on this one, since it has a nice wide flat shoulder on the arm. So far (knock on wood) it’s working. Here’s what it looks like:
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Old Today, 03:02 AM
  #2650  
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Thanks Sammy.
I've never seen that tensioner!
I have a couple of tensioners I picked up but never one like that.
I'm not able to use the RPM belt, they don't have a lot in my size (99", or 2510).

I found this site, and ordered a couple of the Gates Micro-V belts.
https://www.gates.com/us/en/power-tr...-v-belts/c/104

This Amazon site also has the pull down tab for belt sizes for Bando Belts.
Amazon Amazon

I actually bought one at Amazon for $8, and one for $16
The car currently has a NAPA Micro-V 080991 / 8PK2517.
I'll try a 98.6"/8PK2505 belt first.

Without you wrenching, this place kind of slows down a lot LOL
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Old Today, 03:51 AM
  #2651  
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Originally Posted by Chiselchst View Post
Thanks Sammy.
I've never seen that tensioner!
I have a couple of tensioners I picked up but never one like that.
I'm not able to use the RPM belt, they don't have a lot in my size (99", or 2510).

I found this site, and ordered a couple of the Gates Micro-V belts.
https://www.gates.com/us/en/power-tr...-v-belts/c/104

This Amazon site also has the pull down tab for belt sizes for Bando Belts.
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

I actually bought one at Amazon for $8, and one for $16
The car currently has a NAPA Micro-V 080991 / 8PK2517.
I'll try a 98.6"/8PK2505 belt first.

Without you wrenching, this place kind of slows down a lot LOL
No worries Mitch. I donít think thereís a tensioner in existence that I havenít seen, in my quest to find one that works, lol. Hopefully this one will hold up now and I can focus on other things like suspension tuning, etc.
And donít worry about not finding an RPM belt, theyíre more trouble than theyíre worth, from my experience. They need to be exactly the right length, which is easy if you have an adjustable tensioner to put it where it needs to be in the spring tensioner. We donít have that option with our setup.
BTW: If you canít find the exact length belt, you can always try to go with a larger idler or tensioner pulley. Iím assuming that the 8-rib tensioner pulley youíre running is the standard IW ďCorvetteĒ 8-rib pulley, which is 2.69Ē in dia., iirc. They also have a larger one, like what Iím running now, which is 3.00Ē in dia. I only bought that because I needed a quick replacement and that was all Summit had in stock. Mine is very slightly damaged from kissing the Magnuson idler when the last tensioner jammed down on the stop (from me running too small a belt). In fact, if you need to buy the larger one to get your belt to fit properly, Iíll gladly buy the one you have now off you as a spare and pay for shipping. Looks like those come in handy for me!
I havenít been doing any wrenching lately, on account of being in Germany with the wife for the last three weeks. Heading back home tomorrow though, and Iíve got two cars to prep for our next event on the 27th, so Iím sure Iíll be wrenching again soon.
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