Chill. It's OK. Really. (long) - Saab 900 Bulletin Board - Saabnet.com
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Chill. It's OK. Really. (long)
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Posted by JD From LA (more from JD From LA) on Sat, 1 Jun 2002 02:42:51 Share Post by Email
In Reply to: short blocks and dashboards, paul richardson, Fri, 31 May 2002 20:39:23
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Freshening this short block is not a biggie. This block will handle a 1mm overbore (roughly .040 over). The most popular oversize for SAABs in my experience is .5mm (roughly .020). Why? Because most any cylinder wall problems can be cleaned with a .5mm overbore so they are the most popular.

Use only forged Mahle pistons. They come with some nice long-wearing rings already fitted and are the best replacements. Most SAABs are fitted with Mahle pistons from the factory. Beautiful forgings.

Vandervell makes a fine long-wearing bearing for this engine. They're a little harder than the stock ones but will never wear out in a motor getting regular oil changes. Your machinist can supply you with them.

Have the motor rebalanced after the heavier overbore pistons are fitted to the rods. A good balance job makes the motor so smooth, it disappears at certain rpms.

Pistons and bearings are still available. A good machinist will have a few rods laying around if you need one (rebalancing necessary). When I lived in CT, my old machinist sold me a set of Vandervell rod and main bearings for my SAAB, plus had a spare rod as well. I bought the pistons from a certain mechanic in North Carolina through my knowledgeable independent SAAB parts man.

my machinist then bored and triple-honed the cylinder walls using a computer controlled Sunnen honing machine to a satin finish. Cylinder sealing and oil control were excellent. Everything was re-balanced and ran beautifully.

I think the dashboard fix is more problemmatical than the short block :)

JD

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