One engine using too much fuel

Brian, do you have fixed-pitch ground-adjustable propellers? It's possible that one prop is pitched slightly different from the other and so to match RPM one engine's manifold pressure will be slightly higher than the other. I had this same exact issue on my AirCam. It took a lot of time and readjustment but I got the engines within 20RPM of each other on takeoff. That pretty well cured the problem.

Prop pitch adjustment with my Warp Drive props is really touchy. A point-two degree change is significant and the pitch can drift as you tighten the bolts. 

Ed

I think anything more than one tenth of a degree out on a prop is a sin  When you know how to do prop pitch changes they are really easy. I teach this in my classes since it’s attached to the engine and a major component. What’s funny is most A&P’s don’t know how to set prop pitch or how much adjustment to make.

Sorry for the slow reply, I've been at AirVenture. They are both fixed pitch (but ground adjustable) Warp Drive props. In theory they are set the same, but I'm going to check on this because it actually makes sense. Thanks for the reply.

Thanks for the reply. I'm going to check this again.