Author Topic: Muffler for 1971 MC 7 with normally aspirated 8V71  (Read 280 times)

Offline travel44

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Muffler for 1971 MC 7 with normally aspirated 8V71
« on: November 25, 2019, 01:46:27 PM »
Hello Bus Board,

We have been taking care of this 1971 MC 7 for about 20 years now.

Searched the archives for info on a muffler but have come up empty.

Does anyone have a cross up for the MCI muffler, maybe a Nelson or Donaldson? Was on the phone with Donaldson today with no luck. MCI
will have them available but at cost of $1260.00.

Any help is appreciated, Peter

Offline DoubleEagle

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Re: Muffler for 1971 MC 7 with normally aspirated 8V71
« Reply #1 on: November 25, 2019, 02:35:23 PM »
The people with MCI's will probably have a solution, paying $1260 would be crazy, about $1000 too much. Failing an exact match at a reasonable price, just measure what you have for pipe inlet and outlet, and the available space. There will be a generic muffler out there that will fit somehow. On Eagles, people have put on dual straight-thru glass packs that are a little louder, but reduce the back pressure.
Walter
Dayton, Ohio
1975 Silvereagle Model 05, 8V71, 4 speed Spicer
1982 Eagle Model 10, 6V92, 5 speed Spicer
1984 Eagle Model 10, 6V92 w/Jacobs, Allison HT740
1994 Eagle Model 15-45, Series 60 w/Jacobs, HT741

Offline travel44

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Re: Muffler for 1971 MC 7 with normally aspirated 8V71
« Reply #2 on: November 25, 2019, 03:38:08 PM »
Thanks Double Eagle, have been looking and will try Walker tomorrow. In the meantime I moved this post over to “Bus Topics”.

Offline Stormcloud

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Re: Muffler for 1971 MC 7 with normally aspirated 8V71
« Reply #3 on: November 27, 2019, 10:57:04 AM »
I had to replace muffler on my MCI7 ( same as yours) several years ago.  Inlet is 5", outlet on factory muffler was 4"; Donaldson replacement is 5" outlet. I used a 5" preformed 90 degree bend and 'massaged' the curve to make a tailpiece.

If I was to do it again, I would put one of the tiny 5" in and out "fart can" mufflers that the kids use nowadays on their diesel powered pickups. Way cheaper, and easier to install..just need a pit of 5" pipe and some clamps.

That also makes it road legal. I believe running with no muffler can be reason for a ticket from the troopers.



Mark Morgan  
1972 MCI-7 'Papabus'
8v71N MT654 Automatic
 Brandon, Manitoba, Canada in summer
 somewhere around Yuma, Arizona in winter