90.5mm Mahle cylinders specifications...

[bugnut68]

What is the maximum tolerance for 90.5mm cylinders, in terms of checking for out of roundness?  I've got a set I'm going to measure and want to know what tolerances to look for.  They look good at a purely visual standpoint, but will be measuring them with a bore gauge to make sure they're not excessively worn.  My hope is all they will need is a honing and new rings, as I was told they came out of an engine that wasn't run long.

[DKK Ted]

Ryan, are you using a dial bore gage or an inside mic? Bore must be pretty straight and round, to me just about perfect, with the money your putting, do not take short cuts. PM me if you need help.

Ted

[bugnut68]

Ryan, are you using a dial bore gage or an inside mic? Bore must be pretty straight and round, to me just about perfect, with the money your putting, do not take short cuts. PM me if you need help.

Ted

I've got a dial bore gauge, Ted... I'm very strict on checking whatever parts I have for the same reason you mentioned, too important to mess it up given the dollars involved. 

[DKK Ted]

Thats good! Measure the barrel on top, middle and bottom, also  12 o-clock, 3 o-clock, up & down, see what you get on all four cylinders.

[bugnut68]

I got lucky on the P/C's... whereas the rods I bought from the same guy at a swap meet last year are complete worthless junk, the cylinders are all in good shape!  They all measured in exactly the same.  What a relief.  Looks like a new set of rings and a hone job are what I'll be pursuing to freshen them up.

[Speed-Randy]

I got lucky on the P/C's... whereas the rods I bought from the same guy at a swap meet last year are complete worthless junk, the cylinders are all in good shape!  They all measured in exactly the same.  What a relief.  Looks like a new set of rings and a hone job are what I'll be pursuing to freshen them up.

Thats the chance you take when you buy used motor parts at a swap meet, remember, they are selling that crap for a reason.

[RFbuilt]

yeah the reason always "funding for the big motor"  supposedly   

[bugnut68]

I got lucky on the P/C's... whereas the rods I bought from the same guy at a swap meet last year are complete worthless junk, the cylinders are all in good shape!  They all measured in exactly the same.  What a relief.  Looks like a new set of rings and a hone job are what I'll be pursuing to freshen them up.

Thats the chance you take when you buy used motor parts at a swap meet, remember, they are selling that crap for a reason.

Believe me, I now know this to be too dang true.  For anyone that's interested, I bought the parts from Walter Shit, I mean Schmidt, who used to run the Wally Gator Bug at Pacific Northwest VW events in Oregon and Washington.  I thought he actually he seemed like a nice guy, but obviously my former instincts about him were true. 

Bottom line is I'm glad the P/C's turned out to be okay.  I usually just buy new, but it seems to me that pistons and cylinders, depending on their application, are sometimes thrown away way too soon.  Had they come out of a turbo engine I probably wouldn't have bought them.  Lol.