MG Midget Madness (i.e. It was either this or kill it with fire)

GySgtFrank · 08-21-2015, 04:18 PM

I had to build a merge collector to feed the two 1.75 inch ID pipes into the single 2.5 inch ID inlet for my muffler. It was a far bigger chore than it had any right to be. I had planned to use a header collector flange that would allow me to swivel the pipe around to make it fit if I moved the muffler. Unfortunately I couldn't find that style of 2.5 inch collector that would fit my existing flange on the muffler. If I had to do it over again, I would cut the flange off the muffler and use the other style flange, but I didn't, so this will have to work.

muffler merge collector 1 by Kevin Frank, on Flickr

muffler merge collector 2 by Kevin Frank, on Flickr

muffler merge collector 3 by Kevin Frank, on Flickr

I used a 2.5 inch ID flange that would fit my muffler flange, a short section of 2.5 inch ID exhaust pipe, and two short pieces of 1.75 inch ID (2" OD) to make the piece. I had to split and form the 2.5" pipe in four directions after it was welded to the flange. I then formed it onto the two short pieces of 2" OD pipe, that I had already welded together, and tacked it down. I cut out and formed some fill pieces for the gaps where the split pipe no longer covered and put a lot of welds inside and out to ensure that I have no leaks. Clean up on all those welds was not fun. As I said, far more work than was reasonable. I would suggest using an off the shelf part if at all possible, the high cost of parts like this are for a reason, time and effort. I couldn't as no one makes a part like this to join the pieces that I am planning to use.

This piece will allow me to connect the two pipes side by side to be run over and dropped down with 90s. They will run forward between the fuel tank and frame rail, one stacked on top of the other with a small gap between them. It is going to be enough of a battle trying to get the pipes in the right position without having to worry about the fit at the muffler end as well.

chibikougan · 08-21-2015, 07:36 PM

Where ya bored?

Looks good and like its gonna work...

08-21-2015, 04:18 PM	#1
GySgtFrank Professional Stick Poker Join Date: Feb 2011 Location: Stafford, Ks. Posts: 1,012 Rep Power: 16	I had to build a merge collector to feed the two 1.75 inch ID pipes into the single 2.5 inch ID inlet for my muffler. It was a far bigger chore than it had any right to be. I had planned to use a header collector flange that would allow me to swivel the pipe around to make it fit if I moved the muffler. Unfortunately I couldn't find that style of 2.5 inch collector that would fit my existing flange on the muffler. If I had to do it over again, I would cut the flange off the muffler and use the other style flange, but I didn't, so this will have to work. muffler merge collector 1 by Kevin Frank, on Flickr muffler merge collector 2 by Kevin Frank, on Flickr muffler merge collector 3 by Kevin Frank, on Flickr I used a 2.5 inch ID flange that would fit my muffler flange, a short section of 2.5 inch ID exhaust pipe, and two short pieces of 1.75 inch ID (2" OD) to make the piece. I had to split and form the 2.5" pipe in four directions after it was welded to the flange. I then formed it onto the two short pieces of 2" OD pipe, that I had already welded together, and tacked it down. I cut out and formed some fill pieces for the gaps where the split pipe no longer covered and put a lot of welds inside and out to ensure that I have no leaks. Clean up on all those welds was not fun. As I said, far more work than was reasonable. I would suggest using an off the shelf part if at all possible, the high cost of parts like this are for a reason, time and effort. I couldn't as no one makes a part like this to join the pieces that I am planning to use. This piece will allow me to connect the two pipes side by side to be run over and dropped down with 90s. They will run forward between the fuel tank and frame rail, one stacked on top of the other with a small gap between them. It is going to be enough of a battle trying to get the pipes in the right position without having to worry about the fit at the muffler end as well. __________________ 1988 N/A SE 2+2, dead stock and staying that way. 1979 SA22C stock? Not so much. http://rotarycarclub.com/rotary_foru...ad.php?t=15585 Last edited by GySgtFrank; 08-21-2015 at 04:49 PM.