Engine Test Stand Question

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Dan Mazur
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Engine Test Stand Question

#1 Post by Dan Mazur » Sat Jun 09, 2018 1:33 pm

Hi Folks,
Im putting together a test stand for my 356 C, 6volt engine.
I acquired what appears to be a later VW buss bell housing and fabbed up a weldment to mount it to the engine stand.
Silly me, I didn't read up on the forum before starting down this rabbit hole and now realize the issues with starter motors not fitting, bushings too small, etc.
I did machine away some of the casting so the 356 lower bolts were accessible for nuts and washers.

It seems this was addressed in an earlier thread, but no final resolution was posted.
viewtopic.php?f=1&t=4630

Question for those who have gone before; Is there a way to make this work with a 6 volt 356 engine, or should I bail out before diving deeper in the rabbit hole?

Thanks and Kind Regards
Dan
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David Jones
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Re: Engine Test Stand Question

#2 Post by David Jones » Sat Jun 09, 2018 5:06 pm

Dan, one issue with the bus trans piece if it was for a 12 volt starter will be the diameter of the hole for the starter shaft. It is smaller than the 6 volt starter so will not fit. The solution is to turn the starter shaft down on a lathe which unfortunately requires dismantling the starter motor.
A VW starter from a parts store is cheap and if you use 12 volts it will spin the engine over very well.
If I had known I would live this long I would have pushed the envelope a little harder.
Cymru am byth
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Doug McDonnell
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Re: Engine Test Stand Question

#3 Post by Doug McDonnell » Sat Jun 09, 2018 5:10 pm

PM sent
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John Brooks
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Re: Engine Test Stand Question

#4 Post by John Brooks » Sat Jun 09, 2018 6:17 pm

Dan

Does the 6V starter bolt up? Enlarging the hole is pretty easy, and putting in the bushing. I have used an old bent window case half for years and it works for 6V like it should, and my 12V started does not have the extended shaft for the bushing so it works both ways.
You might find your setup a little shaky that far up the pole, when running. Mine is below


http://www.abcgt.com/forum/14-356-Resto ... stand.html
John Brooks

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John Weyand
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Re: Engine Test Stand Question

#5 Post by John Weyand » Wed Jun 13, 2018 7:49 am

Don't alter the trans starter bushing hole, use a special bushing bushing that the buggy guys have used for years. It will allow a 12 volt starter to fit a 6 volt mount.

https://www.appletreeauto.com/12V-TO-6V ... a30ab5f939
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David Jones
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Re: Engine Test Stand Question

#6 Post by David Jones » Wed Jun 13, 2018 9:53 am

But a 12 volt starter has the wrong starter dog and will not mesh with the 6 volt starter ring gear and there is no bushing that can fit in the already smaller diameter hole in the 12 volt starter case. Ask me how I know because I just did it with a bus trans starter housing. A new 12 volt starter with the correct 6 volt starter dog will cost more than using a new 6 volt VW starter with a turned down starter shaft. The 6 volt VW starter will work very well with 12 volts and as it is not in frequent use should not cause any significant damage to the starter ring gear.
If I had known I would live this long I would have pushed the envelope a little harder.
Cymru am byth
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Wil Mittelbach
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Re: Engine Test Stand Question

#7 Post by Wil Mittelbach » Thu Jun 14, 2018 1:22 am

Dan -
Perhaps of alternative interest:-
As depicted below, I used Tom Perazzo's engine stand adapter for my 6v C engine and starter.
Tom's Zalex Industries' adapter comes in full or half ring configurations with starter mount.
For specific info: <zalexindustries.com> or call Tom at (858) 243-0476.
- Wil
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Dan Epperly
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Re: Engine Test Stand Question

#8 Post by Dan Epperly » Thu Jun 14, 2018 9:49 am

I use an old VW bell housing on both my Porsche and VW engine builds 6 or 12 volt. The OD on the bushing housing is the same, the ID is different, so as someone pointed out you just need to get the adapter bushing. For the 12v its a narrower ID. With a fatter OD assuming it's a six volt flywheel.
Everything else should fit right up.

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