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John Moxon 
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Joined: March 07, 2004
Posts: 14099
Location: Southampton U.K.
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[email protected]
Samba Member
Joined: June 24, 2015
Posts: 781
Location: Rialto. CA
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 Posted: Fri Nov 08, 2024 5:36 pm Post subject: Re: Shorrock C75BV on a Ghia Cabriolet in Australia |
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| sputnick60 wrote: |
I usually spend my time on the Ghia forum but that has to change now that I've acquired a Shorrock for my '66 Karmann. This had been a long time coming with many dead ends and diversions but finally a complete set up became available out of the UK. John Moxon helped to get this into my hands and it arrived in Australia during the pandemic. More delays ensued because I'm working in New Zealand and access wasn't possible with closed borders.
Since it was removed from a running 1300 beetle in the UK it is quite possible for it to go right on the car, but it looks a little bit aged and could do with a freshen up. It was also damaged in transit and for that some repairs are due.
First up is to show what I have and then to go about doing a full refurbishment of it and its appendages.
My ’66 is built with a 12 volt system. Originally a 6 volt car It was reasonable to convert to the higher voltage during a full full restoration. So to make the Shorrock work it needed a new 12 volt fuel pump. John organised that to come with the shipment and the old pump he managed to sell to someone who needed it.
There were two carburettors provided. One was right off the previous install and the other is a spare. we have a CD 150
I have to get a spare set of belts. These look like a Mintex CUPT374 and a Rootes 9926586. I've looked for those but can't seem to find them. If anyone knows better, do let me know what they are so I can order a set.
I have 2x manifold ends with blow off valves for 1300/1500
and the original rubber manifold couplings.
The blow off valves were seized and I spent a little time with them trying to unbind them. I removed them from the manifold ends
Then I sat them in the vice to try loosen them with some force. I used the handle of a small wooden hammer to push down on the internal piston.
But they wouldn't move until I put a small amount of machine oil on them and that loosened them right up.
I wiped them up and set them aside. Maybe some of you know if that is good enough or if more work is required to get them to spec. I suppose a pressure test of some kind to validate that they open at the right pressure would be something to do.
So here are the broken bits. Poorly packed in transit would be the root cause of that.
The VW stand is broken in one corner. This isn't a difficult TIG repair. There are lots of talented TIG welders out there.
More concerning is the cast iron pulleys both of which are chipped. I have the chipped piece from the larger pulley
The chipped piece is missing from the smaller pulley. I'd like to learn if there are replacements out there. Otherwise I'll have to find someone who can rebuild them.
There are also some studs that got bent in the move. I removed those without difficulty
I also removed the name plate off the unit. I cleaned it up and set it aside. I was amused that the Specification number was stamped upside down. Perfect for life in the southern hemisphere!
And finally a comprehensive series of photos of the blower itself
I have sat it on the bench with an electric drill to rotate it and it spins freely and provides quite a bit of suction at the input and blow at the output. Possibly I only need to do a cosmetic refurbishment but that's not really going to satisfy me. It will look odd going on a motor that was totally stopped down rebuilt and looks like new.
I plan to strip it down and have the outer case water blasted to give it a fresh out-of-the-casting look. All the studs, nuts and washers will be replaced. The same will go with the manifolds and the CD150s.
This will take a while since I'm hoping back and forth across the Tasman but I'm sure it won't take as long as the car to restore.
So stay tuned for the likely infrequent updates.
Cheers for now!
Nicholas |
I know this has nothing to do with this fourm but it got me thinking about these blow off valves on these shorrock supercharger...how would these perform... if one were to use them on a corvair turbo would I have to use the 2 shorrock blow off valves or only 1 for a 36hp corvair turbo setup ???? I've never seen anyone use these blowoff valves for a vintage turbo setup .... |
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thomas.
Samba Member
Joined: July 31, 2010
Posts: 1333
Location: South West (Pa.)
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| Posted: Wed Nov 13, 2024 2:43 am Post subject: Re: Shorrock C75BV on a Ghia Cabriolet in Australia |
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| On a draw thru. with the carb. before the supecharger it is my understanding that a pop off valve is not needed. I've installed various superchargers on draw thru set ups on 40hp & dual port & never used one. You could eliminate it if not worried about originality. |
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macdweal
Samba Member
Joined: October 06, 2008
Posts: 39
Location: Kuilenburg
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| Posted: Sat Nov 23, 2024 6:24 am Post subject: Re: Shorrock C75BV on a Ghia Cabriolet in Australia |
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| I think the pop off valve is for preventing the compressor going airborne in case of a backfire. |
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sputnick60
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Joined: July 22, 2007
Posts: 4042
Location: In Molinya Orbit
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