So, I am running on the ground an O-320 that has been pickled for about 10 years. I have installed it on my RV-9. It has a decent idle smoothness. It has decent mag drops at all rpm ranges. I have unhooked the fuel primer line to eliminate that fuel source.
So far I have not spent any money on it.
When experimenting with different throttle RPM settings above 900rpm, the engine is rough until given major leaning (I'd say about an inch and a half of mixture knob movement) at which point the engine smooths out and I gain about 200rpm. At wide open it is closer to 250rpm.
I have not had the carburetor apart yet (Marvel schebler MA-4SPA) so that will be my next step. For the experienced out there, is this a classic Marvel case? I am also aware of marvels float problems and updates. I am comfortable with working on carburetors.
My best leaned WOT so far is 2150 rpm. Hopefully that will improve with work.
Any comments or similar stories will be appreciated. Thanks
So far I have not spent any money on it.
When experimenting with different throttle RPM settings above 900rpm, the engine is rough until given major leaning (I'd say about an inch and a half of mixture knob movement) at which point the engine smooths out and I gain about 200rpm. At wide open it is closer to 250rpm.
I have not had the carburetor apart yet (Marvel schebler MA-4SPA) so that will be my next step. For the experienced out there, is this a classic Marvel case? I am also aware of marvels float problems and updates. I am comfortable with working on carburetors.
My best leaned WOT so far is 2150 rpm. Hopefully that will improve with work.
Any comments or similar stories will be appreciated. Thanks