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".
Posts in this Thread:
Post a Followup
The content on this site may not be republished without permission. Copyright © 1988-2012 - The Saab Network - saabnet.com.
This is a moderated bulletin board - Posting is a privilege, not a right. Unsolicited commercial postings are not allowed (no Spam). Please, no For Sale or Wanted postings, SERIOUSLY. Classifieds are to be listed in The Saab Network Classifieds pages. This is a problem solving forum for over 250,000 Saab owners, so expect to see problems discussed here even though our cars are generally very reliable. This is not an anything goes type of forum. Saabnet.com has been a moderated forum since 1988. For usage guidelines, see the Saabnet.com Mission and Purpose Page. Please remember that you are not anonymous. Site Donations
Your address is: 188.8.131.52 - Using CCBot/2.0 - Logged.