charles harbert wrote:

Ed, glad to hear you got your fuel mixture problem solved. Do you monitor your
EGT in relation to your mixture? Pretty interesting correlation. Anyway, I
believe the reason your blowing the rear oil seal on the Ross is it's completely
full of oil and pressurizing the case to where it blows out the oil seal.You can
check this by installing a clear plastic vent line from the higher gbox drain
line (pilot side) to the oil filler tube, and seeing if it fills up. The gbox
drain system is inadequate (3/8" dia) unless you restrict the incoming oil to
about a .030" jet(which is too little for higher hp).  We ended up installing a
scavenge pump (elec fuel pump) to suck the oil out which allowed us to go to a
.040 jet (75% more flow), and left the vent line as a back up drain should the
scavenge pump fail.

Did you install a thrust bearing (assume you have a 2.17:1 ratio)? You can buy
the Viton double lip seal for  this at a bearing supply house for about $15. The
low temp seal (black neoprene?) is only about $3. I bought a few when I had the
blown seal problems. So far the new system is holding.

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