<blockquote><font size="1" face="Verdana, Arial">quote:</font><hr>Originally posted by Gary Lloyd:
You should get more than your crank and flywheel balanced!! Your rods, your pistons and your clutch!! You will be suprised at how much they take off!! They should spin them up and 'dynamically' balance them. <hr></blockquote>
Hi Gary,
I think this is what you meant, Just a little clarification.
With inline engines only the rotating parts, flywheel, balancer or pulley, clutch, & the crank itself are spun. Each part can be spun individually, everything assembled & final checked as a unit.
The rest of the engine is statically balanced. All pistons weigh the same, all rod big ends (rotating weight) weigh the same, all rod small ends (reciprocating weight) weigh the same.
V type engines are done the same except that a bob weight is clamped onto each rod journal before the crank is spun. The bob weights are set to weigh 100 percent of the rotating weight (rod big end plus bearing shells) plus usually 50 to 80 percent of the full reciprocating weight (rod small end plus piston & rings)
This 50 to 80 percent balance factor varies with the intended engine usage & resonances of the particular car design.
It will all help engine smoothness & bearing life as you said.
D