Bill,
The other significant '4' is the number of cycles in an operation, viz.,
Intake, Compression, Power and Exhaust. The throws of the crankshaft are
aligned
so that one cylinder is at each of these cycles at any given time. Think of the
firing order, 1342, you'll see that the crank throws are paired so that pistons
1
and 4 are in the same relative position, e.g., both at the top, and pistons 2
and
3 are likewise paired. So there are really only two natural stopping points ---
180 degrees apart.
Bud Krueger
52TD
77MGB
"William M. Gilroy" wrote:
> Barney Gaylord wrote:
> >
> > Actually guys, because of the way the four cylinder enigne stops on the
> > compression stroke, the ring gear wears in two places 180 degrees apart for
> > a distance of about six inches in each place. Rotating the flywheel 180
> > won't make any difference. Just relocate it 60 degrees either way to
> > prolong the life of the ring gear.
> >
> > Barney Gaylord
> > 1958 MGA with an attitude
> > http://www.ntsource.com/~barneymg
>
> I must be missing something. If you have four cylinders and each cylinder
> has its compression stroke at a different time, I would think the that
> engine would stop at one in 4 places on the flywheel that are 90 degrees
> apart. Why would this be wrong?
>
> Bill Gilroy
> 77 Midget
> 90 Shar-Pei
|