I have the Titan IO-370 engine installed in my PA-18 clone experimental. The engine was run at the factory for 3 hours and I have flown it for 5 hours. No problems except high CHTs on number 3 and 4 cylinders. (400-420) Baffling corrections are helping with that. The engine has a Slick mag on the left, and an Emag on the right, with the jumper cable in to give the A curve. After last flight, I did some more rigging for a heavy left wing, and some other adjustments, and attempted to fly it again. The engine when started was missing and shaking very badly. It would idle, and then on its own, increase in RPMs up to about 1,100 rpms. Pulling the mixture to almost shut off would get it to idle a little bit lower. When mixture is moved to shut off no increase in RPMs. I then checked both mags, did a baby bottle flow test on the injectors, check all plugs and leads, tightened up the air intake tubes and no better. Sent the Performance Aero injector back to have it factory checked, they did and found no problems. Great customer service from them. No charge.
Tried engine again, no change. Number 4 cylinder is running much cooler than the others. I have had the local A&P, IA go over it, and he can not understand it, brought in a seasoned Lycoming Engine guy, and he is stumped. We did bore scope the cylinders, and found no problems. We have about covered every thing, and still no relief. It does the same on either mag and both mags. Fuel pressure is about 28 to 30 lbs, and flow was about 10 gal an hour when it was running correctly. Hoping some of you guys can help me with new ideas. The tech at Performance Aero guessed it would be an intake leak, but we have gone over those and changed gaskets. Have a set of SDS intake flanges with the o ring grove in it on order.
Stumped
Thanks
Bruce
Tried engine again, no change. Number 4 cylinder is running much cooler than the others. I have had the local A&P, IA go over it, and he can not understand it, brought in a seasoned Lycoming Engine guy, and he is stumped. We did bore scope the cylinders, and found no problems. We have about covered every thing, and still no relief. It does the same on either mag and both mags. Fuel pressure is about 28 to 30 lbs, and flow was about 10 gal an hour when it was running correctly. Hoping some of you guys can help me with new ideas. The tech at Performance Aero guessed it would be an intake leak, but we have gone over those and changed gaskets. Have a set of SDS intake flanges with the o ring grove in it on order.
Stumped
Thanks
Bruce