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Re: Engine Balancing Posted by eric in vermont [Email] (#2058) [Profile/Gallery] (more from eric in vermont) on Fri, 6 Sep 2013 04:00:06 In Reply to: Engine Balancing, BAAB [Profile/Gallery] , Thu, 5 Sep 2013 21:23:15 Members do not see ads below this line. - Help Keep This Site Online - Signup |
The engine in my '74 Sonett was built by Jack Lawrence and is balanced. It will pull to over 7500 RPM- of course other things were done to it, not just balancing. The point is, if you are looking to increase HP and RPM capability, balancing will be a small cost compared to some of the other stuff, and you'll have to do it. If, on the other hand, you're just rebuilding a tired motor for a car that you'll putt around in with little or no performance mods, it probably isn't worth the cost. Maybe you're in the middle- balancing will make your motor run smoother with less vibration and it's bearing should last longer.
You can google the term and see exactly what's done, but in theory, the engine shop will balance the reciprocating components so they all weigh the same within a certain, small amount. That means they weigh each piston assembly with connecting rod, bolts, etc and make them all weigh the same. The flywheel and clutch assembly are also balanced. Consider lightening the flywheel as well- that goes hand in hand with balancing. A balanced motor can get away with a much lighter flywheel, which means it has less rotating mass, which means it revs quicker. You can get the flywheel specs from the old Saab Sport and Rally catalog, in the back. Google it and you'll see.
Not sure what a shop gets for that these days. I'd lean towards getting it done.
eric in vermont
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