Francois is concerned about apex seal life with the PP.

The apex seal does not seem to suffer and abnormal wear from Pport operation.
I have one in the old car and it had the same seals in it for two years, and
those seals came from a side port engine. Those were the carbon seals. I have
a set of the ceramic seals for the side port engine. They are harder than
Chinese arithmetic.

You run 2 springs under them and they still have far less drag than either
stock or carbon race seals. They do not bounce even at 10,000 + RPM. They do not
wear the rotor housing at all. The stock iron seals wear grooves in the rotor
housings. They are heavy compared to the ceramics.

Both the carbon and ceramic seals will run on giant Port openings without a
problem of any kind.

In the event of a top oil failure the carbon seals will loose tiny flakes
from the trailing side, and leak a bit. But not enough to stop the engine. I did
not screw up that bad on the ceramic seals but I think they will get enough
lube from the fuel that no damage at all would occur. As in the fire wall oil
tank runs dry, or you forget to premix a fuel load.

The end product needs to have ceramic seals, even if you have to make a set
that have the corner piece like the stock seals. I don't know how that would
wear on the cast iron. They are one piece for racing.

Lynn E. Hanover

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