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Reproduction OT Pulley's
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grailoc
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PostPosted: Tue Nov 29, 2016 3:03 pm    Post subject: Re: Reproduction OT Pulley's Reply with quote

johnny d wrote:
grailoc wrote:
johnny d wrote:
Hi Gents,
did someone actually use those ISP OT Pulleys?

if so, can someone tell me if these work or not?

I have one but still have not the chance to get the engine running, and i know wondering about the measures of the rear. All OG VW-Pullys are 49,90mm,


Just measured my OG pulley and had 49.9mm exactly.


your OG OT Pulley or OG VW Pulley?


OG VW Pulley Smile
I got the same measurement what you had on the picture above
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rtroy
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PostPosted: Tue Nov 29, 2016 7:39 pm    Post subject: Re: Reproduction OT Pulley's Reply with quote

johnny d wrote:
grailoc wrote:
johnny d wrote:
Hi Gents,
did someone actually use those ISP OT Pulleys?

if so, can someone tell me if these work or not?

I have one but still have not the chance to get the engine running, and i know wondering about the measures of the rear. All OG VW-Pullys are 49,90mm,


Just measured my OG pulley and had 49.9mm exactly.


your OG OT Pulley or OG VW Pulley?


I find that a curious and somewhat uninformed question! (No offense intended - few of us have direct experience with these, I guess.)

...From the first days of Porsche, they used the same crankshaft bore as VW, and every aspect of the crankshaft bore, including both the pulley end and the flywheel end, were identical for both companies engines. They remained the same until the advent of the three-piece crankcase for Porsche when Porsche bumped up the bore by a quarter millimeter, presumably to prevent the use of the VW bearing in their new case instead of the new bronze backed bearings introduced at the same time. (That didn't entirely work, though, because some aftermarket companies made a VW style bearing in the Porsche size! This means that you COULD have align-bored your VW to one quarter mm oversize and run EITHER a standard Porsche bearing OR an aftermarket bearing and I have seen many cases, both VW and Porsche, that had this done to them...

So, what I'm saying is; they're the same.

I also went and just measured two of my four "OG" OT pulleys - the two that aren't presently mounted on an engine! - and they were 49.92 and 49.91mm, respectively.

The pulley bore in the case, by the way, starts at EXACTLY the same bore size as the #4 main bearing's outside diameter because the two bores are cut by the same cutter at the same time. (IE: the pulley bore is nominally 50mm.)

If the ISP West product is indeed 49.3 as the image shows, they would likely leak, I would think (!!) and they should in any event fix this manufacturing oversight.

Now, they ARE aluminum and aluminum has a different coefficient of expansion than steel (or maybe they're iron?) does, so they might need to be a tiny bit smaller to ensure they don't rub when hot, but I seriously doubt that they need 0.6mm for that! ...That's 0.3 per side, of course, but still...
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pig-pen
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PostPosted: Wed Nov 30, 2016 5:19 am    Post subject: Re: Reproduction OT Pulley's Reply with quote

so....

Does anyone else have an iSP pulley to measure.??? I was about to buy one but now I am not so sure...
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PostPosted: Thu Dec 01, 2016 3:04 pm    Post subject: Re: Reproduction OT Pulley's Reply with quote

rtroy wrote:
johnny d wrote:
grailoc wrote:
johnny d wrote:
Hi Gents,
did someone actually use those ISP OT Pulleys?

if so, can someone tell me if these work or not?

I have one but still have not the chance to get the engine running, and i know wondering about the measures of the rear. All OG VW-Pullys are 49,90mm,


Just measured my OG pulley and had 49.9mm exactly.


your OG OT Pulley or OG VW Pulley?


I find that a curious and somewhat uninformed question! (No offense intended - few of us have direct experience with these, I guess.)

...From the first days of Porsche, they used the same crankshaft bore as VW, and every aspect of the crankshaft bore, including both the pulley end and the flywheel end, were identical for both companies engines. They remained the same until the advent of the three-piece crankcase for Porsche when Porsche bumped up the bore by a quarter millimeter, presumably to prevent the use of the VW bearing in their new case instead of the new bronze backed bearings introduced at the same time. (That didn't entirely work, though, because some aftermarket companies made a VW style bearing in the Porsche size! This means that you COULD have align-bored your VW to one quarter mm oversize and run EITHER a standard Porsche bearing OR an aftermarket bearing and I have seen many cases, both VW and Porsche, that had this done to them...

So, what I'm saying is; they're the same.

I also went and just measured two of my four "OG" OT pulleys - the two that aren't presently mounted on an engine! - and they were 49.92 and 49.91mm, respectively.

The pulley bore in the case, by the way, starts at EXACTLY the same bore size as the #4 main bearing's outside diameter because the two bores are cut by the same cutter at the same time. (IE: the pulley bore is nominally 50mm.)

If the ISP West product is indeed 49.3 as the image shows, they would likely leak, I would think (!!) and they should in any event fix this manufacturing oversight.

Now, they ARE aluminum and aluminum has a different coefficient of expansion than steel (or maybe they're iron?) does, so they might need to be a tiny bit smaller to ensure they don't rub when hot, but I seriously doubt that they need 0.6mm for that! ...That's 0.3 per side, of course, but still...

thats what isp wrote me back:
Hi,

It is a very small difference and it will not cause an oil leak.

Thank you,
Alex Pegado
ISP West
310 637 2100

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grailoc
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PostPosted: Fri Dec 02, 2016 10:06 am    Post subject: Re: Reproduction OT Pulley's Reply with quote

I think if there is not positive pressure into the engine case then there should not be any issue with pulley oil leak.

A breathing box might help preventing this.
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My 59 low light ghia: http://www.thesamba.com/vw/forum/viewtopic.php?p=7852268
My 56 beetle convertible: http://www.thesamba.com/vw/forum/viewtopic.php?p=7796259
My 60 SO23 westy: http://www.thesamba.com/vw/forum/viewtopic.php?t=341539
Check my blog: http://us-road-trip-vw-bus.skynetblogs.be/
and my garage build thread: http://www.garagejournal.com/forum/showthread.php?t=199438

My other vehicles
KG 64
vespa 1961 Acma & spanish GT 160
2 Lambretta LI 150
2 1971 Honda CT70
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EVfun
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PostPosted: Fri Dec 02, 2016 10:12 pm    Post subject: Re: Reproduction OT Pulley's Reply with quote

johnny d wrote:
rtroy wrote:
johnny d wrote:
grailoc wrote:
johnny d wrote:
Hi Gents,
did someone actually use those ISP OT Pulleys?

if so, can someone tell me if these work or not?

I have one but still have not the chance to get the engine running, and i know wondering about the measures of the rear. All OG VW-Pullys are 49,90mm,


Just measured my OG pulley and had 49.9mm exactly.


your OG OT Pulley or OG VW Pulley?


I find that a curious and somewhat uninformed question! (No offense intended - few of us have direct experience with these, I guess.)

...From the first days of Porsche, they used the same crankshaft bore as VW, and every aspect of the crankshaft bore, including both the pulley end and the flywheel end, were identical for both companies engines. They remained the same until the advent of the three-piece crankcase for Porsche when Porsche bumped up the bore by a quarter millimeter, presumably to prevent the use of the VW bearing in their new case instead of the new bronze backed bearings introduced at the same time. (That didn't entirely work, though, because some aftermarket companies made a VW style bearing in the Porsche size! This means that you COULD have align-bored your VW to one quarter mm oversize and run EITHER a standard Porsche bearing OR an aftermarket bearing and I have seen many cases, both VW and Porsche, that had this done to them...

So, what I'm saying is; they're the same.

I also went and just measured two of my four "OG" OT pulleys - the two that aren't presently mounted on an engine! - and they were 49.92 and 49.91mm, respectively.

The pulley bore in the case, by the way, starts at EXACTLY the same bore size as the #4 main bearing's outside diameter because the two bores are cut by the same cutter at the same time. (IE: the pulley bore is nominally 50mm.)

If the ISP West product is indeed 49.3 as the image shows, they would likely leak, I would think (!!) and they should in any event fix this manufacturing oversight.

Now, they ARE aluminum and aluminum has a different coefficient of expansion than steel (or maybe they're iron?) does, so they might need to be a tiny bit smaller to ensure they don't rub when hot, but I seriously doubt that they need 0.6mm for that! ...That's 0.3 per side, of course, but still...

thats what isp wrote me back:
Hi,

It is a very small difference and it will not cause an oil leak.

Thank you,
Alex Pegado
ISP West
310 637 2100


I don't think 23 thou is "very small" but what do I know.
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PostPosted: Thu Dec 22, 2016 8:38 am    Post subject: Re: Reproduction OT Pulley's Reply with quote

What size belts are ya'll running with these pulley's? I'm using the stock generator pulley on my 36HP case and I've tried several but all of them are too long.
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PostPosted: Sat Dec 24, 2016 10:25 am    Post subject: Re: Reproduction OT Pulley's Reply with quote

So here's a couple of pictures of my belt trials...

zero shims between the pulley


Image may have been reduced in size. Click image to view fullscreen.

Image may have been reduced in size. Click image to view fullscreen.

Image may have been reduced in size. Click image to view fullscreen.
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Erik G
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PostPosted: Sun Dec 25, 2016 8:01 am    Post subject: Re: Reproduction OT Pulley's Reply with quote

Use a piece of rope and then measure the rope
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txoval
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PostPosted: Sun Dec 25, 2016 8:37 am    Post subject: Re: Reproduction OT Pulley's Reply with quote

Go with an 887 belt

http://www.vbeltsupply.com/spz887-1.html
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PostPosted: Mon Dec 26, 2016 9:17 pm    Post subject: Re: Reproduction OT Pulley's Reply with quote

I ordered a 10x888, we'll see if that one works.
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PostPosted: Thu Dec 29, 2016 4:31 pm    Post subject: Re: Reproduction OT Pulley's Reply with quote

sorry, i can´t help you out here.. i ordered ten different belts until i found this one, that works the best..
Image may have been reduced in size. Click image to view fullscreen.

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PostPosted: Thu Dec 29, 2016 10:06 pm    Post subject: Re: Reproduction OT Pulley's Reply with quote

johnny d - Did you forget to post the belt size you used?
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PostPosted: Mon Jan 02, 2017 10:04 am    Post subject: Re: Reproduction OT Pulley's Reply with quote

IDK why anyone would have trouble with the belt size; if you run the stock 36hp gen pulley, the standard belt should fit fine. Here's an example with a genuine OT pulley, 36hp gen pulley circa 1959, and a stock belt:


Image may have been reduced in size. Click image to view fullscreen.



Image may have been reduced in size. Click image to view fullscreen.



Remember, the OT pulley is the same size as the standard 36hp pulley; while it will take a wider belt, a wider belt is not required.

If you have a problem, it's probably because the repro isn't that faithful. . .
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PostPosted: Sun Mar 05, 2017 11:03 pm    Post subject: Re: Reproduction OT Pulley's Reply with quote

jdub63 wrote:
So here's a couple of pictures of my belt trials...

Image may have been reduced in size. Click image to view fullscreen.


jdub63

You have the correct 36hp generator pulley as I can tell from your photo that 1 half has a "wider" lip. Not sure if rtroy is aware that he is not running a 36hp generator pulley but a much later one. Probably a 40hp which explains why his fan belt fits and yours doesn't. You can see on my engine, I'm running a 10X900 Continental belt BUT with a Denzel crankshaft pulley. See photo below.

Image may have been reduced in size. Click image to view fullscreen.


Have you tried running a fan belt WITHOUT the "cog" type serrations? That may help. Good luck, Mr. Okrasa Cool
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