Some good information about crankshaft balace: ...With "internally balanced" engines, the counterweights themselves handle the job of offsetting the reciprocating mass of the pistons and rods. "Externally balanced" engines, on the other hand, have additional counterweights on the flywheel and/or harmonic damper to assist the crankshaft in maintaining balance. Some engines have to be externally balanced because there isn’t enough clearance inside the crankcase to handle counterweights of sufficient size to balance the engine. This is true of engines with longer strokes and/or large displacements.
If you’re rebuilding an engine that is internally balanced, the flywheel and damper have no effect on engine balance and can be balanced separately. But with externally balanced engines, the flywheel and damper must be mounted on the crank prior to balancing. Customers should be told what type of engine balance they have (internal or external), and warned about indexing the position of the flywheel if they have to remove it later for resurfacing. Owners of externally balanced engines should also be warned about installing different flywheels or harmonic dampers and how it can upset balance... View the full article: http://www.rlengines.com/Web_Pages/Crankshaft-Balancing.html Thank you, Don Hoeschen CEO\Mechanical Engineer G r a n i t e C i t y P e r f o r m a n c e custom engineered competition components ---- Daniel Solomon <[EMAIL PROTECTED]> wrote: ============= The 454 is an externally balance engine. The weight on the flywheel provides that balance. The flywheel must have the weights. Godspeed, Dan Solomon It is a mistake to allow any mechanical object to realize you are in a hurry http://www.freewebs.com/chevelles1970/<http://www.freewebs.com/chevelles1970/> ----- Original Message ----- From: ronnie, a.k.a. rocko<mailto:[EMAIL PROTECTED]> To: [email protected]<mailto:[email protected]> Sent: Wednesday, October 24, 2007 12:02 PM Subject: [Chevelle-list] External And Internal Flywheels Hello, just some info on flywheels, i have a 67 with a four speed, in jegs and summit they list two flywheels, both 168 tooth, one internal one external, a friend explained its just the weights, the external being on the outside, so if one installs the internal flywheel on a 454 engine will there be any problems ? if there is more to it than just the weights can someone shed some light, __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com
