Barnhart wrote:
 >
 > Paul,
 >
 > The dimensions for the outer TEC O-ring is 35.31". The inner is 28.625'.
 >
 >  Is this inner or outer diameter?
 >
 > Barny

On the other hand, I reuse the outer water "O" ring over and over again. It
gets too long so I cut through the ring on a steep angle. Put a bit of pure
GE silicone tub caulk into the groove and press the ring into the groove.
Match up the angle of the cut and trim off the excess. Put a dab of silicone
over the joint. Make the joint on the center top of the engine. It won't
leak, but if it ever did, you could see it on the top of the case.

The silicone also keeps everything together during assembly.

For the inner (Compression) ring I use the stock ring, or 18 gauge Teflon
covered aircraft hook up wire. Again with a very tiny bead of silicone in the
groove. The joint should be even with the intake port. Another dab of
silicone over the joint. For bridge ported engines, I take a sharpened punch
and stand up a burr in the floor of the inner groove to prevent the "O" ring
from oozing into the "J" port. Again, a drop of silicone at each end of the
ring and along the remaining aluminum rib to keep the water out. Bill Koch
runs in GT-2 with a 13B, and he just uses regular 18 gauge hook up wire. Not
even Teflon. The silicone is the trick. After the case bolts are torqued,
squirt some oil into both housings and turn the engine over a few times. The
silicone scraps will come out the exhaust port. No leaks yet, since 1980.

   I think a "J" ported 20B would be right at 300 HP at 6,500 RPM. I sure
would like to build one of those.

Lynn E. Hanover

 
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