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daos
Samba Member
Joined: January 01, 2017
Posts: 309
Location: Stockholm, SWE
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 Posted: Sun Aug 29, 2021 12:07 pm Post subject: Locked Bosch ZV/PAU 4R5 |
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was thinking about how to simply & non-destructively lock a big cap for use with CB black box. came up with the following - a simple 1mm (edit: 2mm) thick steel plate which fits over the two posts that normally locate the spring. holes are a precise fit (5.1 mm and 4.9 mm). they prevent any movement, & the spring is then placed in its usual position to add tension. the whole thing is very stiff. breaker plate is located exactly halfway between its normal min/max positions.
if anyone can see any issues with this let me know:
Last edited by daos on Sun Aug 29, 2021 11:34 pm; edited 1 time in total |
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madmike
Samba Member
Joined: July 11, 2005
Posts: 5292
Location: Atlanta,Michigan
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| Posted: Sun Aug 29, 2021 12:19 pm Post subject: Re: Locked Bosch ZV/PAU 4R5 |
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 "That's using your head" as my grandpa would of said 
I see no issues
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chrisflstf
Samba Member
Joined: February 10, 2004
Posts: 3444
Location: San Diego
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| Posted: Sun Aug 29, 2021 12:49 pm Post subject: Re: Locked Bosch ZV/PAU 4R5 |
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| Great idea! Alot better than someone elses idea of using a long screw from the side jammed up against the breaker plate, which then rubs on the shaft. I dont know if your position in the middle is best, but its easy to fix |
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Glenn 
Mr. 010
Joined: December 25, 2001
Posts: 76938
Location: Sneaking up behind you
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| Posted: Sun Aug 29, 2021 1:17 pm Post subject: Re: Locked Bosch ZV/PAU 4R5 |
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| chrisflstf wrote: |
| Great idea! Alot better than someone elses idea of using a long screw from the side jammed up against the breaker plate, which then rubs on the shaft. I dont know if your position in the middle is best, but its easy to fix |
Actually using the screw does lock the plate but it does not touch the shaft. The shaft spins inside the body and the breaker plate is outside. Obviously you never had a 40hp Big Cap apart. When giving an opinion, you should knowing what you're talking about.
OP... I like your idea 
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Glenn
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chrisflstf
Samba Member
Joined: February 10, 2004
Posts: 3444
Location: San Diego
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| Posted: Sun Aug 29, 2021 1:42 pm Post subject: Re: Locked Bosch ZV/PAU 4R5 |
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| Quote: |
| Actually using the screw does lock the plate but it does not touch the shaft. The shaft spins inside the body and the breaker plate is outside. Obviously you never had a 40hp Big Cap apart. |
I have taken them apart. Your fix is like driving with the brakes on, but go ahead |
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daos
Samba Member
Joined: January 01, 2017
Posts: 309
Location: Stockholm, SWE
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| Posted: Sun Aug 29, 2021 1:47 pm Post subject: Re: Locked Bosch ZV/PAU 4R5 |
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| chrisflstf wrote: |
| Great idea! A lot better than someone elses idea of using a long screw from the side jammed up against the breaker plate, which then rubs on the shaft. I dont know if your position in the middle is best, but its easy to fix |
i understand what you're getting at and looking at a completely assembled unit it does look like the plate rides around the shaft, in which case jamming it from the side would be a terrible idea - but the breaker plate actually rotates around the outside of the (very beefy & stiff) shaft housing in the distributor body, and the shaft runs through the centre of the housing. so in fact, there is no contact between the breaker and the shaft.
will have to see about the position - as you say, easy fix. thinking about how to make the plate adjustable.. but that might be overthinking it. |
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Glenn
Mr. 010
Joined: December 25, 2001
Posts: 76938
Location: Sneaking up behind you
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| Posted: Sun Aug 29, 2021 1:49 pm Post subject: Re: Locked Bosch ZV/PAU 4R5 |
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| chrisflstf wrote: |
| I have taken them apart. |
No you haven't or you wouldn't say that. The shaft spins inside and the breaker plate moves on the outside.
I do agree that the OP's solution is more elegant.
| chrisflstf wrote: |
| Your fix is like driving with the brakes on, but go ahead |
Please explain this.
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Glenn
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chrisflstf
Samba Member
Joined: February 10, 2004
Posts: 3444
Location: San Diego
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| Posted: Sun Aug 29, 2021 2:34 pm Post subject: Re: Locked Bosch ZV/PAU 4R5 |
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| Quote: |
| i understand what you're getting at and looking at a completely assembled unit it does look like the plate rides around the shaft, in which case jamming it from the side would be a terrible idea - but the breaker plate actually rotates around the outside of the (very beefy & stiff) shaft housing in the distributor body, and the shaft runs through the centre of the housing. so in fact, there is no contact between the breaker and the shaft. |
Your right, my bad! |
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Glenn
Mr. 010
Joined: December 25, 2001
Posts: 76938
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| Posted: Sun Aug 29, 2021 2:38 pm Post subject: Re: Locked Bosch ZV/PAU 4R5 |
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| chrisflstf wrote: |
| Quote: |
| i understand what you're getting at and looking at a completely assembled unit it does look like the plate rides around the shaft, in which case jamming it from the side would be a terrible idea - but the breaker plate actually rotates around the outside of the (very beefy & stiff) shaft housing in the distributor body, and the shaft runs through the centre of the housing. so in fact, there is no contact between the breaker and the shaft. |
Your right, my bad! |
Moving on....
Again I like the OP's solution and will have to copy it.
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Glenn
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Alstrup
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Glenn
Mr. 010
Joined: December 25, 2001
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| Posted: Sun Aug 29, 2021 3:06 pm Post subject: Re: Locked Bosch ZV/PAU 4R5 |
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| Alstrup wrote: |
| The only issue I see is a possible phasing problem. But you can check that when you get it in the engine and start adjusting. |
Agreed, i would lock it as if it was at 0* advance.
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Glenn
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daos
Samba Member
Joined: January 01, 2017
Posts: 309
Location: Stockholm, SWE
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| Posted: Sun Aug 29, 2021 4:02 pm Post subject: Re: Locked Bosch ZV/PAU 4R5 |
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| y, can check phasing in situ, and 0° does sound like a better start point. will make a new version and see if i can maybe add some adjustability. |
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chrisflstf
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Joined: February 10, 2004
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Location: San Diego
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| Posted: Sun Aug 29, 2021 4:40 pm Post subject: Re: Locked Bosch ZV/PAU 4R5 |
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| If you have the means to make them easily, Id sell them. Glenn would buy some and I would also. Zero advance seems the best as I assume locked out 009 or 010's are done at zero. There is the wide tip rotor in some cases also to deal with phasing |
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Glenn
Mr. 010
Joined: December 25, 2001
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| Posted: Sun Aug 29, 2021 4:47 pm Post subject: Re: Locked Bosch ZV/PAU 4R5 |
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Not sure there's much of a market since I had a locked 40 ad.for 2 years and its still available.
Maybe make 10 and offer them at $10 shipped.
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Glenn
74 Beetle Specs | 74 Beetle Restoration | 2180cc Engine
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daos
Samba Member
Joined: January 01, 2017
Posts: 309
Location: Stockholm, SWE
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| Posted: Sun Aug 29, 2021 11:42 pm Post subject: Re: Locked Bosch ZV/PAU 4R5 |
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| hadn't thought about selling.. let's see where i end up with the (posssibly maybe) adjustable version. will check back with an update over the weekend. |
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mikedjames
Samba Member
Joined: July 02, 2012
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Location: Hamble, Hampshire, UK
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| Posted: Mon Aug 30, 2021 9:39 am Post subject: Re: Locked Bosch ZV/PAU 4R5 |
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Balance?
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daos
Samba Member
Joined: January 01, 2017
Posts: 309
Location: Stockholm, SWE
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| Posted: Mon Aug 30, 2021 9:50 am Post subject: Re: Locked Bosch ZV/PAU 4R5 |
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daos
Samba Member
Joined: January 01, 2017
Posts: 309
Location: Stockholm, SWE
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| Posted: Sat Sep 04, 2021 2:20 pm Post subject: Re: Locked Bosch ZV/PAU 4R5 |
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so here's the new version in 1.2mm steel, locked at 0° advance. will see how that plays out once installed and go from there. skipped the adjustability for now, it's too easy to just make a new plate.
this really should have been posted in the thread i started for my 2007cc and distributor alternatives. i'll add this last post and any updates to that thread.
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tasb
The Distributor Distributor
Joined: April 27, 2002
Posts: 6371
Location: Pentwater, Michigan
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| Posted: Sat Sep 04, 2021 4:01 pm Post subject: Re: Locked Bosch ZV/PAU 4R5 |
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Looks really clean. don't forget to continue to ground the points plate and you still need to lubricate the felt through the oiling hole near the cam.
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heimlich
VWNOS.com
Joined: November 20, 2016
Posts: 6616
Location: Houston, Texas
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| Posted: Sun Sep 05, 2021 10:28 am Post subject: Re: Locked Bosch ZV/PAU 4R5 |
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Looks good but you will need to make sure the holes are exactly sized to the pins. If there is even a little movement it could potentially bounce around the timing.
I'd put a screw in the side as well or find a smaller spring that would put some compression on the two posts. You don't want them moving at all.
You could also glue the points plate to the bushing (the outside only). You don't want that points plate rotating on it at all.
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