How much difference between the carb on a DLE20 and a DLE30? I have a used DLE30 that is in a P-47, which is in for repair after striking a roof! My Bad, but only because the engine was running poorly at low to mid throttle and I was afraid it was going to quit and rushed the landing.

So, what happens is WOT or thereabouts, engine runs great, but anywhere between idle and mid throttle it surges and/or runs rough. No hesitation from idle to WOT, or any strange high/low idles like the DLE20 is known for. Is this because LSN or HSN is too rich, or both? There is a lot more discharge from the exhaust on the 30 than there is on the 20 even considering the 10cc displacement.

At 1/4 throttle, it would surge enough to cause the plane to porpoise if that gives some idea what it does.