What belt?

Are you one of those confused people who can't make up their mind?
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craigvwdude
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What belt?

Post by craigvwdude » Wed Sep 01, 2021 12:43 pm

Fellas,
when doing the suby conversion, what alt. belt is everyone using when eliminating all other accessory's? I'll be just running the alternator.
thanks!

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panel
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Joined: Sun Sep 24, 2000 2:01 am

Re: What belt?

Post by panel » Fri Sep 03, 2021 8:52 pm

Craig , I've eliminated the factory adjuster and went with a simple heim joint set-up. You can see it in an older vid.

Belt info: Dayco 5050290. Not sure it'll work for your length but might get you in the ball park.

https://www.youtube.com/watch?v=BO3r-OkzGtA

About 0:24 sec's in.
'65 Bus with a JDM Subaru EJ20 Turbo
Built by Germans powered by Japanese and brought together by Canadians

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GS guy
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Re: What belt?

Post by GS guy » Sat Sep 25, 2021 7:37 am

Alternator in stock position using the non-AC alternator mount: AC Delco 5K275
Mock-up1.JPG
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Ol'fogasaurus
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Re: What belt?

Post by Ol'fogasaurus » Sat Sep 25, 2021 11:16 am

If possible I would add an idler pully to that mainly because the upper pully is so small so the contact area is tiny.

Lee

More info: remember, as the RPMs increase the belt will be thrown out into more of an arc/to the sides more and more (mass causing it) as the RPMs get higher. One of the reasons you usually seen them on high powered cars. https://www.bing.com/search?q=idler+pul ... dd80dbe720

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panel
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Re: What belt?

Post by panel » Sat Oct 09, 2021 8:44 pm

Ol'fogasaurus......but the factory never had one ?
'65 Bus with a JDM Subaru EJ20 Turbo
Built by Germans powered by Japanese and brought together by Canadians

Ol'fogasaurus
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Re: What belt?

Post by Ol'fogasaurus » Sat Oct 09, 2021 10:15 pm

panel wrote:
Sat Oct 09, 2021 8:44 pm
Ol'fogasaurus......but the factory never had one ?
The way that a belt works for water pumps and generators/alternators has always been a problem especially as the RPMs go up. The belt has a mass to it; if you swung a bucket of water on a rope as you swung it faster you can feel the mass want to move away from the origination of the action... being you. As the belt wants to swing out the contact area of it on the pullies gets smaller.

Maybe this is better: https://www.bing.com/search?q=how+does+ ... a0e8982d77

https://en.wikipedia.org/wiki/Pulley

Page down to the belt and pully system

In your case I would suggest that the idler pully pushes the belt towards the center of the two main pullies giving both of them more wrap-a-round contact with the belt and the idler pully.. I can draw a pix if you want.

Lee

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panel
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Re: What belt?

Post by panel » Sat Oct 09, 2021 10:21 pm

No need for pics :) I'm a Millwright. It was just an observation that the Japanese engineers thought it was fine without one. I love and learn from your explanations......it's no disrespect it was just curiosity etc.
'65 Bus with a JDM Subaru EJ20 Turbo
Built by Germans powered by Japanese and brought together by Canadians

Ol'fogasaurus
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Re: What belt?

Post by Ol'fogasaurus » Sat Oct 09, 2021 11:37 pm

:oops: :wink:

Lee

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