Does anyone have any photos/guidelines for altering the lower cowling on a RV14A from a 4 into 1 exhaust system into Vetterman's 4 into 2 exhaust systems for a IO390-EXP177 A3B6 Thunderbolt engine? Photos would be especially appreciated.
Start with an approximation of the cutouts that you know will need to be enlarged by way of successive cuts, i.e. start knowing the cut outs will be tight.
I enlarged both of the cut outs at least twice after the first cuts. The cowling is off now to do my first oil change and I will be enlarging the left side exhaust cut out, the photo of the cut out with the line of dots. That cut out is clear of the exhaust pipe but I want more. It should be my last cut out adjustment.
I started out with the sizes in this pic and made the final a little larger to make sure the engine shake didn't cause the pipes to contact the cowling
Here is how I did mine. I started out with 1/2” clearance all around but opened that up to 5/8” after my first flight due to rubbing at start up and shutdown. FYI this is a 390 EXP60
Does anyone have any photos/guidelines for altering the lower cowling on a RV14A from a 4 into 1 exhaust system into Vetterman's 4 into 2 exhaust systems for a IO390-EXP177 A3B6 Thunderbolt engine?