Mahle or KS
 

Is this a Mahle or a KS cylinder?http://forums.pelicanparts.com/uploa...1291487424.jpg

KS.

My Mahle cylinders have Mahle written across the bottom.

Looked up KolbenSchmidt on the Internet, their corporate logo matched the cast symbol on the right.
Now to decide whether to leave the rings alone or chance that new ones will seat.

Sorry, meant to say left

Lots of opinions on here on reringing... most are not favorable... it will come down to budget...

If it wasn't for the question of money many decisions would be easier.
New cylinder barrels and pistons are out of the question at this point in time. The motor has 100K miles and high oil consumption. The cylinder heads are out for rebuild and I'm left with whether to re-ring while its apart.

Talk to Tom Butler... Tom1394racing. He probably has a complete set of Nikasils to sell you for less than you might think...
Otherwise.. I would probably take the chance and re-ring them...

Wondering if anybody has heard, seeing or used a set of brand new cast iron P&C that sells on ebay for around 600 bucks.

Any opinions, thoughts?

Early P&C are cast iron so why not put them on a 2.7 rebuild?

Talk to Tom. May be able to get a superior set of Nikasil P&C for not much more...

I do have a nice set of 9.3CR Mahle Nikasils on the shelf.

PM me if interested.

Thanks

Pretty low miles on what you have. I'd check the ring end gaps and examine pistons/cylinders for wear. With your miles I'd expect them to all be well within spec and probably better than brand new Goetz rings. If you put everything back the same as it came out you should be fine.

-Andy

Back in the day we would take 320 wet and dry sand paper with some oil and just scuff the walls lightly with no problems. With a sixty degree or so cross hatch and new rings.

If you've got nothing but time on your hands :) you should read the ridiculously long thread here in the rebuilding forum about re-ringing Alusil cylinders.

http://forums.pelicanparts.com/911-engine-rebuilding-forum/137346-re-ring-alusils.html

While you usually have to take most of what you read on the internet with a grain of salt, there was some pretty good information put together to find out what happens when you throw a hone (hone type varies) against an alusil cylinder

While re-ringing is a possible solution (I've done it myself a couple of times with Alusil), if you use your old rings you aren't "re-ringing" and so you don't have to worry about it. No prep required except a clean up. I'd stick the cylinders in the dishwasher and take the pistons somewhere to get an ultrasonic cleaning.

-Andy

he said he wanted to use new rings (post 3). probably good since he also said he is using alot of oil (post 6).

best scenario is to get a used set of nikasil from Tom. In the end, unless this is a DD, probably worth the wait to do it right...

I read through the entire thread on reusing the Alusil barrels, boy the technology was really brought to bear on that one, electron beam microscopes to scan the surface, holy crap.
Currently I am waiting to hear from the engine builder about the condition of the heads, specifically the valve guides. When I removed the intake manifold there was oil pooled in behind the closed intake valves. This explains the blue cloud of smoke in start up, if the guide wear was severe it could explain the high oil usage.
I pulled the piston on the one cylinder that showed low compression, no broken rings and fit is in spec. Left the pistons inside the remaining cylinders.

There are two reasons I recommend using the old rings. You avoid the possibility of the rings not seating, and many times the new rings fit worse than the old rings (end gaps out of spec). Of course the pistons and rings should be measured for wear and checked for damage. I just keep the rings sorted out and pistons matched to the rings and cylinders they came from. I even note the position of the end gaps when I remove the pistons but that is probably overkill.

-Andy