Kevin Baker

I have a short block of questionable heritage, and there is a small amount of damage to the bores. It appears that something was between the rings and cylinder walls, the scoring is noticeable with a "fingernail" but there is not a ridge at the top of the bore that I can feel. Question is, what is the best way to repair this, or should I even bother. I want to build a completely stock motor, at a minimal cost.

AznDrgn

Nothing you can do about it short of boring it out with a special process. Last I checked it was about $1500 just for boring and then you'd need to find oversized pistons. Your best bet to a low cost build is to just run it as is or else find a better short block. I may have one shortly if you decide to go that route.

Mike C.

Best bet is to get another good used motor. Re-boring the high silicon content aluminum properly ain't cheap nor will the OEM oversized pistons be. Some people have installed steel sleeves and I saw a thread fairly recently about a place that does repair and some kind of special coating on the cylinders. However, none of these other options are cheap....

Mike C.

Here's the web site I was talking about:

http://www.928motorsports.com/services/uschrome.html

StoogeMoe

Here's what my cylinder's looked like before doing my rebuild.

Picture

I could catch my fingernail on some of those scratches you see. I took this block around to get several trusted opinions on it. Everybody said that it wasn't great, but just run it like that. You won't notice anything.

So I followed that advice and can say that my rebuild turned out way better than I expected. The engine pulls strong. I just crossed the 10k mile mark and have no issues with loss of oil. This engine is stronger than my 86. Sorry I don't have any HP numbers or compression numbers to share with you. I might get them soon.

__________________________________________
1986 944 NA Guards Red all original 91K mi. - minty
1983 944 NA Platinum Metallic w/LSD 10000 mi. beginning a new life
1985 944 NA Guards Red w/LSD (donor car)
1984 911 Carrera Coupe (gone, but not forgotten)
"If you're not living on the edge, you're not living."

Bri Bro

The dry sleave runs around $1k. One good thing is you can use your original pistons. Here is another site:
http://www.944online.com/cgi-bin/ASI...block-944turbo