Rods

[ptimmerm at mashtun.JPL.NASA.GOV]

>>Don't forget that too much boost atlow RPM will cause great stress on
>>the connecting rods and crankshaft.Boosted motors needthe inertia ofthe
>>pistons to balance out some of the gas loads.  My question is,why doyou
>>want to have all of this complication?

>Unless I misunderstood something, I was under the impression from Corky
>Bell's Turbo book, that higher boosts atlower Rs caused less stress than
>less boost at higher RPMs, because most of the rod stress was from the
>piston being jerked down immediately after the exhaust cycle.


Quite right Frederick.  Furthermore, the highly boosted engine does NOT
see significantly higher higher peak cylinder pressures.  It does see a
much longer duration push down however.

paul timmerman