Turbo header design

Clarence L.Snyder clare.snyder.on.ca at ibm.net
Fri Jan 8 06:56:00 GMT 1999


Greg Hermann wrote:
> 
> >
> >    Care to elaborate on this a little? Are we talking about crank vibration
> >(hamonic balancer/flywheel) or something else over my head? Also, a Chevy
> >V-8 fires every 90 degrees of crank rotation. How does a flat crank V-8
> >fire? Every 180 degrees would make sense, but then it would take 4 turns of
> >the crank to hit all 8?! I am so confused......
> 
> Secondary vibration, due to the fact that piston accelerations are
> different at the top and bottom of the stroke due to con rod angularity. A
> four cylinder has an up and down shafing force at twice crank speed (which
> is sometimes countered fairly well with two "balance shafts" counter
> rotating at twice crank speed.) A flat crank V-8 is like two fours.  Too
> late at night to try to describe the shaking which results. 

The well known "big four buzz" common to modified Ford "B"s, Vauxhaul
2300s, and ford 2300s, as well as the Vegas (ouch!!) My '28 Chevy
National and Vauxhaul HC 2300 twin-carb both buzzed pretty good. Hard to
immagine two of them out of phase!!



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