Slip in 90.5s?

[bugnut68]

Anybody aware of the Bergs ever offering slip in 90.5 mm barrels to fit in 88mm bored case spigots?  Some guy on the Samba was rattling off about a whole bunch of what sounded like horse apples, but he maintains the Bergs used to sell these. I'd never heard of it, figured I'd ask around.

[dangerous]

I believe that Bergs DID sell a 90.5 kit
that had cylinders with 88 sizes on the outside,
but these will not slip into a stock case.
The 88s they uses the sizes from were "thick wall".

The VW case std size, is a nominal 90mm
and head 94,
so this would leave little or no wall thickness.

If you want to remove less material from the case,
you can have normal 90.5s machined down to "thick wall 88's" cylinder registers.

I personally like to keep things common,
so that replacement parts are a breeze if ever there is a need.

[Udo]

This is what i do on every case for 90,5's . Bore it to 94,6 diameter on the case and cut the cylinder to get more survace for the cylinder. But you must bore the case ..

Udo

[TexasTom]

I think the reference between 90.5s and 88s having same bore goes back to the original 90.5s that were offered. They were truly over-bored 88s.
The cylinders offered today are ALL thick wall ... Surely others remember ... I think I may still have 1 or 2 'thin-wall' 90.5 cylinders around somewhere in ALL THIS ...
Anyway, the Berg offerings were/are superior in that they are truly thicker walled cylinders ... most likely predecessors to everything available tody.

[bugnut68]

This Samba guy didn't specify, all he said was "its old shit!"  But half his replies are disjointed sentences that run together with little to no coherence, so I figured I would check and see.  Just because I hadn't heard of it doesn't mean it didn't exist, obviously.