Reply To: Omc 22 cubic inch 25 hp differences

[frankr]

I wrote up and posted a brief history of the drains system on the 22 cu in motors, but the posting disappeared (!!). I’ll try again. For years, the puddle drains discharged raw fuel near the lower seal, and the excess fuel went right into the lake. Beginning in 1968, the drainage went through a lose leading to a hollow bolt in the lower bypass cover. From there, it was discharged into the hot exhaust stream, which I suppose might have evaporated some of it, but the rest still went into the lake. In 1971 the discharge was again re-routed to a fitting in the upper bypass cover for injection directly into the cylinder for burning. All that really accomplished was making the motor idle lousy due to the upper cylinder being too rich. Leaning out the mixture needle just made the lower cylinder lean sneeze. We got many complaints from customers that traded in an older motor and immediately noticed the new motor did not run as well as what they traded in.

While all this was going on, the drainage system was being modified and/or partially eliminated. Needless to say, that also made the motors idle poorly.