Re: Final phase, Aero project car, piston time: what would you do? - Saab 9-5 Bulletin Board - Saabnet.com
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Re: Final phase, Aero project car, piston time: what would you do?
2 Saabers Like This Post!
Posted by rdebets [Email] (more from rdebets) on Thu, 10 Sep 2020 04:26:21
In Reply to: Final phase, Aero project car, piston time: what would you do?, bobc [Profile/Gallery]
, Tue, 8 Sep 2020 21:46:50
I bought the piston rings here in Europe, original Mahle, for $120 for the full set for 4 pistons so $360 sounds a bit high. Not sure whether the proparts piston rings are any good.
MAybe it makes sense to replace all 4 pistons since they come from an engine without the noise so you don't have to start guessing which one is the bad one in the current engine.
I have done torn down 5 engines which resulted in 3 engine refurbs and 2 scrapped engines. One of the three I refurbished was borderline with respect to bearing shells but had good cylinder walls, 1 had reasonable shells and good cylinder walls and 1 had such excellent bearing shells (at 400K miles) that I just put them back and only put new piston rings in because they were worn a bit over the spec (gap when in the cylinder). All done in-car. All still three run perfectly fine, no oil consumption. I didn't flatten the head, didn't hone the cylinder walls, just replaced the piston rings, chains and bearing shells. The one where I replaced the rings at 400K miles is now at 560K miles and running very well.
posted by 87.208.227...
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