Max RPM for da slant?
thinking f shot peening the rods and the bottom end balance would be to .25 of a gram...
anybody?
Don't bother with the balance job...get the weights close for each cyl.
I didn't balance mine on the advice of my machinest and have no issues.
Balance and smoothness
An inline six engine is in perfect primary and secondary mechanical
balance, without the use of a
balance shaft. The engine is in primary balance because the front and rear trio of cylinders are mirror images, and the
pistons move in pairs. That is, piston #1 balances #6, #2 balances #5, and #3 balances #4, largely eliminating the polar rocking motion that would otherwise result. Secondary imbalance is avoided because an inline six cylinder crankshaft has six crank throws arranged in three planes offset at 120°. The result is that differences in piston speed at any given point in rotation are effectively canceled.
An
inline four cylinder or V6 engine without a balance shaft will experience secondary dynamic imbalance, resulting in engine vibration. As a general rule, the forces arising from any dynamic imbalance increase as the square of the engine speed that is, if the speed doubles, vibration will increase by a factor of four. In contrast, inline six engines have no primary or secondary imbalances, and with carefully designed crankshaft vibration dampers to absorb
torsional vibration, will run more smoothly at the same crankshaft speed (rpm). This characteristic has made the inline six popular in some European sports-luxury cars, where smooth high-speed performance and good fuel economy are desirable. As engine reciprocating forces increase with the cube of piston mass, inline six is a preferred configuration for large truck engines.
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