Fast Fred's OMC Mod 50 secrets Thread #2

[Powerabout]

I guess lowering could be for 2 reasons?

1) slows the pulse down from that cylinder so the next one (120ish degrees away) gets less return pulse and possibly later?

2) Could have less CR due to the fact that it gets a very high return pulse and really stuffs the cylinder?

2 guesses really?

[Fast Fred]

Fueler Mod50

[Mark75H]

I guess lowering could be for 2 reasons?

1) slows the pulse down from that cylinder so the next one (120ish degrees away) gets less return pulse and possibly later?

2) Could have less CR due to the fact that it gets a very high return pulse and really stuffs the cylinder?

2 guesses really?

I had to think about it for a long while. I think it is most likely that the compression is varied from cylinder to cylinder due to uneven cooling in the head and block. Other manufacturers have sometimes varied the ignition timing to compensate for this.

[Fast Fred]

on the yamaha, i've recut the head deck to even it up, number 3 allways comes up a bit short, was thinkin cuzz of the injector pump space the hole did not charge as well like 1 and 2.

[Powerabout]

Fred
If you burn a piston in the Yam which one goes first?

[Tim Kurcz]

OK you OMC triple buffs, I've got an extra Mod-50 flywheel available for sale. Anyone interested send a message.

Tim

[Powerabout]

Tim
Is that the same as a M31 flexplate?
How many different race flywheels was there for the 49 ci?
Thanks
Powerabout

[Fast Fred]

number one allways burnt down on me, i was allways pushin timin.

only one 3 cyl race flywheel, the mod50 flex wheel.