Shorrock C75BV on a Ghia Cabriolet in Australia

[sputnick60]

Thanks D-train. I figure a restoration isn't a restoration if anything is left out.

At the moment I need some wisdom from the brains trust. I've pulled apart the pair of CD150's that were bundled with this Shorrock and need to order new metering needles and needle valves. Both are different versions. One is older and is adjustable. It has the 4B metering needle with a 150 needle valve. The other is non adjustable and has a spring loaded metering needle marked B5EP with the needle valve marked 1.75.

The older adjustable CD150 was on the PO's 1300-SP engine and is likely set well enough to also work on my 1300SP. The newer non-adjustable CD150 was thrown in as an extra so it unlikely to be set up for anything.

The VW Shorrock installation instructions are detailed enough and specify this for the CD150

Spring: Blue
Needle : Special (Production No. 4B)
Needle Valve: 2.25
Float setting : 16.5 m.

I've ordered two carburettor kits from Burlen in the UK who own Stromberg and still manufacture them. The 4B needle is not in their catalog so I have asked if they have some stock that's not on-line. The 4B does appear in the CD150 technical manual so its dimensions are known.


Nicholas
_________________
'66 Karmann Ghia Cabriolet...
'65 Porsche 356C Coupe...
2005 Mecedes Benz C180 Kompressor Estate
Stop dead photo links! Post your photos to The Samba Gallery!

[D-train]

loving the effort you're putting into this project
_________________
shiny paint doesnt make it worth any more

[sputnick60]

Ok! So there we have the disassembly and cleaning stage done. Here are the parts all cleaned up and sprayed with ACF-50.

I have to place an order for all the screws and gaskets along with the re-build kits for two Zenith Stromberg CD150's. I'll have to be calling on buddies in the UK to help with that. I'll lean on Burlen for the carb kits and on Danbury Hydraulics for the Shorrock consumables.

Getting there!

Nicholas
_________________
'66 Karmann Ghia Cabriolet...
'65 Porsche 356C Coupe...
2005 Mecedes Benz C180 Kompressor Estate
Stop dead photo links! Post your photos to The Samba Gallery!

[sputnick60]

I found a place in the back of the machine shop at work where a functioning press and a big stock of material exists. I could rummage through that for backing plates and push bars. I had a laugh thinking this place makes spaceships and here am I messing with vintage cars.

This is the main rotor with its bearing removed. It complained the most but the 30 ton press hardly struggled.

I found this set up was good for the vane bearings with close spacing but that was only for the first bearing which seemed to come out fairly easily

This is the same set up from the other side.

The next bearing was tighter and I didn't want to risk bending the brass or loading up the rivets. So I found some more INCONEL plate and used that for better support. In this photo you can see the bearing has started its way out under the controlled force with minimal twisting moment.

This is the full set of vanes and their carriers having the bearings now removed.

Now commences the cleaning stage. I'll have the lot water blasted to get the finish to a clean polished surface.

Nicholas
_________________
'66 Karmann Ghia Cabriolet...
'65 Porsche 356C Coupe...
2005 Mecedes Benz C180 Kompressor Estate
Stop dead photo links! Post your photos to The Samba Gallery!

[sputnick60]

Some more disassembly progress
Separating the rotor from the backplate just required a few taps with a rubber mallet

This shows the main spindle and how it is integral to the back plate. This shouldn't be removed unless you really want to cock up the internal alignment of the C75B.
The round plate is the lock plate that holds down the main rotor's bearing. The ring is a shim that sets the spacing of the vanes at the front and back of the supercharger. Since I'm not splitting the vanes from the hub elements, I can expect the dimension to be maintained

The back side of the rotor has this ring holding down the main bearing. The main bearing should replaced even though it moves quite well. While I'm visiting it would be remiss to not replace it

All over the Shorrock the screw are peened with a punch to prevent the easing out. This seems old school and I'm thinking of using thread locker during reassembly. So far only one screw was totally jammed in place and that was on the Lock Plate deeply recessed in the rotor. I resorted to drilling the screw's centre and using a screw extractor. The hard part was applying rotation so deeply in. I was expecting the same with the larger ring here, but it yielded without difficulty, thank goodness. All the screws will be replaced with new ones.

I found an online supplier of bearings in the UK and placed an order for the full set of bearings . I had hoped they would supply FAG or SKF bearings but instead I was sent KOYO and they are all marked made in Japan. My research suggests these are just as good. KOYO have a good reputation but don't have as wide a range of bearings as FAG/SKF do. In this case that doesn't matter because they have these. I'm glad the supplier didn't send Chinese bearings.

I have to find a Hydraulic press and squeeze out this main bearing and then all the small vane bearings, some of which are quite bad.

Nicholas
_________________
'66 Karmann Ghia Cabriolet...
'65 Porsche 356C Coupe...
2005 Mecedes Benz C180 Kompressor Estate
Stop dead photo links! Post your photos to The Samba Gallery!

[sputnick60]

[wagen19]

[John Moxon]

Yes alternatives have always been out there but the Supercharger Kits weren't aimed at the experienced enthusiast. They were aimed at "the average Joe" who wanted a bit of extra performance from an accessory kit he could fit in a few hours on a Saturday or Sunday and drive it to work on a Monday morning.

...but we're not here to discuss the reasons why they failed to sell.

Sixty years later Nick has his Supercharger kit to restore to it's reliable working order. It's interesting to see its component parts...I've never seen the insides of mine in the 15 years it been running on my Karmann Ghia.
_________________
John.
Judson Supercharger Information on The Samba
My 1958 Shorrock Supercharged Karmann Ghia
Stop dead photo links! Post your photos to The Samba Gallery!

[wagen19]

[John Moxon]

[sputnick60]

Some more photos of the disassembly. Here we see how the vanes and the vane carriers can pull apart.

You just pull them out sideways noting the carriers are interleaved. One vane has its carrier at the top and bottom, the opposite van has its carriers second from top and bottom. The third and fourth vane are almost the same but one is mounted the opposite way around. Between each section is a ~1/8" spacer and in the middle is a single wider spacer, about 1/4"

The parts laid out. I'll replace the 8 bearings which are a common size. Just have to make sure I don't get Chinese ones.

Nicholas
_________________
'66 Karmann Ghia Cabriolet...
'65 Porsche 356C Coupe...
2005 Mecedes Benz C180 Kompressor Estate
Stop dead photo links! Post your photos to The Samba Gallery!

[sputnick60]

Some updates.
I went to a place called Greasy Hands which is a workshop space where you can rent time and access the machinery. I had to grind down the tines of my bearing puller to get a lift on the front bearing. This bearing wasn't installed correctly and was spinning in the front plate causing damage to the aluminium. I'll have to work out a fix for that later. Anyhow the bearing broke apart and I ended up getting sufficient purchase on the inner ring to hear that nice "click" as it finally let go.

From there I turned attention to the main body. I could pull the cotter pin

And then turn the nut to free the vane holders. This nut was only finger tight.

Here are the vanes, the trunions and the vane carriers as one assembly. I have to work out how to pull that stack of bearing without breaking any of the rivets or bending the vanes. Study time!

This is the view back into the C75B. Those counter sunk screws right up there back need to come out to access the rear bearing. Most were no trouble, but one is stuck and I've already stripped the slot. I'll try an easy out, or maybe a drill with a countersink bit to shear the head. It's a difficult to reach but at least it isn't the once next to the shaft.

I found this loose in the back, not sure where it came from. There were some other missing screws so maybe they ended up stuck in an inlet valve. Maybe this is all part of a disaster that prompted the previous owner to sell this one.

Fortunately the front and rear sections have these screw holes that permit controlled force to separate the faces. Would be nice if VW engine blocks had similar.

So here is the outer case separated with the rotor in the background.

I pulled all the studs since they were looking old and could do with a refresh. Some of the manifold studs were bent. Replace the lot I think.

That's all for now

Nicholas
_________________
'66 Karmann Ghia Cabriolet...
'65 Porsche 356C Coupe...
2005 Mecedes Benz C180 Kompressor Estate
Stop dead photo links! Post your photos to The Samba Gallery!

[wagen19]

[John Moxon]

[wagen19]

[John Moxon]

[wagen19]

[John Moxon]

Ahhh they were coarse Roots blowers.
These Shorrock Superchargers sip fuel like a Vicar at a summer tea party.
_________________
John.
Judson Supercharger Information on The Samba
My 1958 Shorrock Supercharged Karmann Ghia
Stop dead photo links! Post your photos to The Samba Gallery!

[wagen19]

[sputnick60]