That's my guess. 4 valve OHC engines have very light seat pressures due to their low mass. Could be a contributing factor. I wanted to mention that I've now passed 300 hours on the Hobbs a couple weeks ago.
Ross, this is not a criticism but why run leaded fuel in an engine not designed for it? Also, why use oil not designed for leaded fuel? I'm very interested in why you're running into problems so early. Who can afford to rebuild a motor every 200 hours?
It's a pain to haul mogas to the airport and tank up and it's not available for cross country trips.
The oil change interval was only 25-30 hours. This with the addition of a lead scavenger in the fuel (Decalin) was supposed to keep the evil spirits away.
I'm only speculating what might be happening. A rebuild would be under $1000 total so I can afford to rebuild every 3-400 hours- not that I want to but it's taken about 5 years to get 300 hours on it. I'm going to keep flying it and doing compression and leakdown tests every 40 hours or so as long as the oil consumption does not get too high. I've switched over now to 80/20 mogas/ 100LL.
I'm looking forward to the fabled unleaded avgas that is being tested now.
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