OMC 727 race motor

[LIQUID NIRVANA]

You are thinking of the prototype V6 Johnson. Here is a picture:


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THis motor is NOT the 727. It is an experimental V6 but not the 727. Jim Nerstrom intimated that there were many different cubic inch engines played with. The 727 was something very different &nd superior to the norm & the designers were surprised that the 727 designed was canned by the heirachy at OMC. I wish we could see the pictures Jim. I am willing & able to make it happen if you don't have the time.
Ken.
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[looseunit225]

i like the look of the fly wheel on that engine

the engine looks alot like a 60 degree

why did OMC deside to go with the 90 degree and merc stayed with the 60 degree

[LIQUID NIRVANA]

Right from the start OMC, even in 1958 considered that the 90 degree engine was inherently better balanced & far less prone to problems than a 60 degree. It was not until 1991 that OMC went with the 60 degree concept in a V6 with the FastStrike & Intruder 150hp & 175 hp series. A 60 degree V4 115hp & 90hp was introduced in 1995. They are still retained till this day in the Evinrude E-Tec line. Beautiful motors, high torque, economical & are just getting better & better. I think they are going to become the motor of choice even more than they are now with the new technology being introduced in the 2010 & 2011 lines. All the larger V6 motors & V8 stayed with the 90 degree V.

You mention the flywheel. That style began life with the 1970 V4 Stinger/Strangler & I believe still in vogue with the V8 F1 motors.
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[looseunit225]

on my V6 3ltr looper i run a v4 looper fly wheel with a diffrent stator!

low amp ignition system they call it!

next year thow i will be running a flat alloy fly wheel because il have motec injection!

[LIQUID NIRVANA]

on my V6 3ltr looper i run a v4 looper fly wheel with a diffrent stator!

low amp ignition system they call it!

next year thow i will be running a flat alloy fly wheel because il have motec injection!

I have heard there are to be some very interesting additions to the ski racing circuit shortly. Perhaps OMC/BRP in MOC will dominate COMPLETELY!!!!!!
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[looseunit225]

what do you mean dominate completely

we already doo

[LIQUID NIRVANA]

Yes I know, BUT wouldn't it be nice to put those BIG BIG inboards in their place. A bit of an ask BUT!!!!!!

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[Skoontz]

When we first saw one of those flywheels on a late production Stinger at the Chicago boat show, dad and I thought it was pretty weird....But then OMC had a closed loop video with cameras mounted on the engine as a tunnel boat hurled around a race course, slamming waves, and hitting 180° turns. To see that thing flex off the mounting, then spring back in place was wild!

Apparently they had issues with crankshaft tops bending and sometimes breaking right out of the motors. Imagine a 10 lb disc spinning at 6500 or so RPM winging it's way forard at 85plus MPH....


Sure wish I could see some of those closed loop films again.

[looseunit225]

well i can tell you now theres a boat that just came out of the mould thats going to do exactly what you say!

its going to blow the big ionboards into next week!

two 3.3ltr slide front motec injected suicide machines!

with 6 inch trunks and quick foot gear boxes

[Powerabout]

Maybe we could get Ron to ask Jimbo who worked on the 727's
What was OMC's policy re development stuff, re melt or just shove it in the corner?