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Re: Jealous Re: 2001 Aero 2.3l rebuild update
Posted by saabsince 93b (# 972) (more from saabsince 93b) on Sun, 11 Mar 2012 11:49:18
In Reply to: Jealous Re: 2001 Aero 2.3l rebuild update, Paul'sAero, Sun, 11 Mar 2012 10:25:08
The highway mileage seems to be the same pretty much. Around town is down a little, but that is because it is so much fun to get into the powerband!!

I was itching to get rid of those low friction pistons with their bad oil sealing and PCV problems. Also good to have some good forged ones in there.

Walter Wong my indy let me drive a customer car that had a lightened crankshaft and I was a amazed at the improved driveablity. That sold me on cutting down the rotating mass. You can lighten the stock flyhweel.....well have your machinist do it, or get the aluminum one from genuinesaab....or your could do a little of both.

We did have to get longer bolts for the aluminum Spec flywheel as the aluminum is thicker in the flange area. Both the seller and the manufacturer were surprised, but we had 5mm less thread depth. The trick was getting the right tensile strength bolts.

The balance shafts were less clear cut. But it is interesting to note that the rotate at 2x the crank speed. So at 5000 RPM the balance shafts and chains are at 10,000 rpm. That looked like a puny chain to me.

I feel that all three of these things were for apparent engine smoothness, [trying to make a 4 run like a 6] and fuel economy. And compromised the longevity and performance of the engine.

I also did exhaust valves and guides and had the heads blueprinted "while we were in there".
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