Sleeving cylinders

[E30godz]

So if you've been reading my threads you know that on cylinder number one i have a slight tolerance issue.

I called the machine shop and asked about sleeving that cylinder to stock bore to compensate. He said they could do it, but it would cause the adjacent cylinder to become slightly out of round. His estimate was by .00075in.

Now the question is would it be better to sleeve and deal with the slightly out of round cylinder number 2, or deal with the slightly excessive clearance on cylinder 1?

[jlevie]

Your best solution would be to bore out all of the cylinders to the next size or to replace the engine with a low mileage one from a salvage yard.

[CorvallisBMW]

+2mm overbore, then custom pistons w/ eta crankshaft. Instant 2.8 :)

[E30godz]

While i would LOVE to double my budget for this project, it is not going to happen.

I know my alternatives, trust me. I would rather have input on the question at hand.

[Rigmaster]

M20?

You're INSANE if you try sleeving it- just get another block and use it.


You ask for input on a problem, but you don't provide alot to go on.






The only way I'd consider sleeving any engine is if they were just impossible to find good used ones, or they were ungodly expensive. M20's (and most BMW engines) are neither.

[Aptyp]

M20?

You're INSANE if you try sleeving it- just get another block and use it.


You ask for input on a problem, but you don't provide alot to go on.






The only way I'd consider sleeving any engine is if they were just impossible to find good used ones, or they were ungodly expensive. M20's (and most BMW engines) are neither.

+1, and why can't the machine shop use a torque plate to hone just one cylinder without messing up others? And why would you have the engine apart and bore only one cylinder?

Take it to a shop that has a torque plate and do all of them, or buy a spare block, I only have 3 laying around. (I and E blocks are identical, easy to find)

[E30godz]

I'm not sure what information would have been more valid than what I had in my original post, Rig. I have a problem and stated the two possible solutions that would fit me best. I then asked input on which one is more advisable. I suppose that 'neither' is an acceptable answer.

Spending 120 bucks on getting one cylinder sleeved, to me, is more cost effective than dragging my ass to a junkyard, pulling and stripping an engine and hoping that the bores are OK. Buying a bare block with good bores may be an option if theres someone local in Raleigh that has one.

Aptyp - When I was talking to the guy at T-Hoff (the place where I'm getting this done) I thought he mentioned that the problem wasn't with the hone that takes place but with the interference fit of the sleeve/block causing the material around the cylinder to deform slightly and the out-of-roundness of adjacent cylinders (fortunately, It would just be one cylinder) that I described. Do torque plates compensate for this? I'm doing this because its a relative budget build and my first one at that. I know that there are countless ways to drop money into an m20. Boring the cylinders and buying pistons will add 1100-1200 dollars to this project.