Paul,

You requested photos of my OMC side plate – They are attached -

The engine had swallowed a piece of metal and seized – housing was damaged but the sides, rotor and seals appeared to be OK except for a few scratches on the depressions in the face of the rotor - You can see in 1624 the overall area location of the hard area – 1627 is a closer photo – 1630 is quite close up –

The inserted area is very hard – cannot scratch it – I have a Rockwell tester but haven’t tried it on the part - The aluminum die casting is quite soft and doesn’t appear to be anodized or have any hard finish on it but it is undamaged – The black line in the photos is just a stain where the rotor had been sitting for a long time, not damage to the side plate -

The inserted hard area as shown in 1630 has a finish similar to that of an Oilite bronze bearing and appears to be porous, possibly for retaining lubricant and releasing it as required – Would be good to find an old OMC engineer who was familiar with the process they used – Do any of your readers know someone like that ? – Maybe a patent exists -

I’m guessing that the side plate was probably lapped flat after the hard material was applied because there are no discernible marks of machining on either the aluminum or the hard surfaced area -

Roland Friestad

The coating could be Nikasil.

Here is where the rotor cooling oil squirter goes.  This allows doing away
with the charge cooling and a simple tuned p-port will increase the VE to
about 120 %. (from 70 or 80% if your lucky). So the HP will increase about 30%.

The oil squirter requires an oil pan to catch the oil drain back, a pump and oil cooler.

Paul Lamar

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