I'm in the process of mounting the engine on my Sig SE. The beam mounts furnished with the ARF are unique in that the beam is off-center. What I mean by this is that depending on how you place the mount on the firewall the beam surface the where the engine mounts can be above the theoretical longitudinal centerline of the model or below it.

If you install it so the beam surface is 'above' then the engine muffler clears the r/h fuse side and the nyrod control guide outlet is even with the output hole on the carb lever.

-however-

If you install the mounts so the beam surface is at or below the c/l then there's a clearance issue with the muffler. It would require you to trim away some of the r/h fuse.

Now, here's the real kicker; both ways of mounting it cause the carb to be well above the centerline of the fuel tank. The first condition I noted being about a 1/2"-5/8" higher than the second condition. I know it's prefereable to have the tank's longitudinal center even with the carb or only slightly above it for optimum fuel draw. In this instance either condition looks to cause the centerline to centerline distance to be greater than an inch or more. This could cause the engine to lean out or stave for fuel.

What do you giuy think? For those of you that have built the SE how does your engine mounting compare to the conditions I described and how is your engine performance?

I am wary of hacking the fuse side since I think this should not be necessary if I am using an engine in the recommended range (Thunder Tiger 46). I'm going with the first condition i noted and will see how it performs but if I experience trouble I'd like to know my options.

Jeff

Jeff,

I had to cut down the side of my SE to get the muffler to clear. No big deal.

I know what you are saying about the carb being higher than the tank. I dont think it will effect your performance. It didnt effect mine. I was using a Webra .50

I have a 46 fx in mine and have had no problems so far with fuel starvation. I see what you're saying, my carb is about an inch above the centerline. I have mine mounted so that the little supports on the engine mount are facing up as you can barely see in the manual. I did not have to cut for the muffler but I did have to cut a small notch for the remote needle valve.

Cut the side away as needed, easy enough to do and won't be visible anyway since it is under the muffler.

Also, I found it is easier to mount the engine to the mounts, and then bolt the mounts in place on the firewall, vs putting the mounts in first.

I cut the side of mine to put my TT Pro 46 on it.
I am still finishing it.
I have to install the throttle cable and finishing mounting the engine (need a couple of lock nuts) and trim it.
I think it is a little back on the CG but from what I have read, should be no problem (about 4 1/2 inches).
I still have room to move the engine forward on the mount if I want to.

Good Luck
Bill