Ford CMP muffler

[Hanno Spoelstra]

Originally Posted by Hanno Spoelstra

Some pictures of how /where a muffler would be fitted originally are welcome, too.

Here are top views from the manual. Am I correct that the exhaust is only supported by two hangers, one behind the muffler and one on the end of the pipe at the rear of the fuel tank?

f15 chassis.jpg

f15a.jpg

[Hanno Spoelstra]

Originally Posted by Hanno Spoelstra

Am I correct that the exhaust is only supported by two hangers, one behind the muffler and one on the end of the pipe at the rear of the fuel tank?

This would be the one behind the muffler:

Originally Posted by Tony Wheeler

However we discovered I have another one on my F60S, I think you may have taken a photo. I should have taken that one off to give you, it's in perfect condition, with the remains of an original muffler by the look of it.

And this one the one behind the gas tank:

Originally Posted by Tony Wheeler

Anyway the bracket is clearly the same as the front one, sans bends, and possibly a bit shorter. There's also a support strap underneath, presumably to minimize flexing over rough terrain...? I imagine this piece would have been straight originally, and was possibly bent by a size 12 boot using the tailpipe as a convenient step!

[Hanno Spoelstra]

And I found Tony posted the correct dimensions

Originally Posted by Tony Wheeler

All my Fords have 2" engine pipes. Two of them have what appear to be original mufflers (dished end plates, 6" diameter, 18" length) and both of these have 1 5/8" tailpipes. This is consistent with several original tailpipe brackets examined by Jacques and me recently. We determined that they're designed for 1 5/8" pipe. They will accept 1 3/4" pipe, but will not fully close when tightened.

[Jacques Reed]

Hello Hanno,

Attached are two photos of an original muffler as installed on a Ford Ambulance at the Bandiana Army Museum in Australia.

It shows the front end of the muffler very close to being in line with the rear step plate bracket.

The third photo is of an original rear bracket on my F15A. With my generic muffler installed, which is the same length as an original, the position is very close to the museum example. To prevent confusion from the photo, my tailpipe has an adaptor which mates the 1-5/8" tailpipe to the 2" outlet of the muffler. When installed, the adaptor fits inside the outlet and the smaller end goes into the bracket. The pipe was left a bit longer for fitting.

Something which is sometimes overlooked, which I have inadvertently done, when shopping for replacement mufflers is the position of the inlet and outlet relative to each other. My replacement one has the inlet and outlet 180 degrees apart.

The museum example shows the inlet at the 6 o'clock position when viewed from that end and the outlet at the 3 o'clock position when viewed from that end (90 degrees apart). I intend to juggle my exhaust pipe a bit to ensure it hangs properly but it would have been nice to have it all line up from the start.

Hope this is of some help in locating it on the truck and sourcing a correct one.

Cheers

[Private_collector]

Hanno,

I have contact details for a company in USA that can make an exact copy of original muffler. Just haven't found where I stored their details. May have posted their name onmy resto thread. Still looking!

[Private_collector]

Found the guy who can make your repro muffler to Ford specs.
http://www.ebay.com/itm/1932-41-FORD...38e891&vxp=mtr

He is still sellling on ebay, and the above link is to one which is already pretty close.

Hope it helps.

[Hanno Spoelstra]

Originally Posted by Private_collector

Found the guy who can make your repro muffler to Ford specs.
http://www.ebay.com/itm/1932-41-FORD...38e891&vxp=mtr

He is still sellling on ebay, and the above link is to one which is already pretty close.

Tony,

Thanks a lot, $100 is not a bad price but I'm sure the shipping will probably double that. I'm looking to buy locally.

Hanno

[Hanno Spoelstra]

Originally Posted by Jacques Reed

The museum example shows the inlet at the 6 o'clock position when viewed from that end and the outlet at the 3 o'clock position when viewed from that end (90 degrees apart). I intend to juggle my exhaust pipe a bit to ensure it hangs properly but it would have been nice to have it all line up from the start.

Jacques,

Certainly of help as I was wondering about the offset for the in- and outlet pipes.

Can you confirm the measurements listed by Tony W.: 6" diameter, 18" length, 2" inlet and 1-5/8" outlet pipes?

Thanks,
Hanno

[Jacques Reed]

Hi Hanno,

Those dimensions seem correct. A ford Truck manual for wartime trucks, not CMP type however, also gave the muffler dimensions as 6" Diameter and 18" long. Would reasonably assume the mufflers are the same. Ford tended to keep it simple and use off the shelf items whenever possible. By example: the choke and throttle knobs on the CMP being the same as used on their passenger cars of that era.

Two sets of original exhaust pipes also confirm that the muffler inlet ID is 2"

I cannot independently verify the 1-5/8" ID outlet on the muffler as I used Tony's information from brackets he supplied me, however the careful analysis of both original tailpipe and rear muffler brackets makes me 99% certain it is 1-5/8" ID. (1-3/4" OD pipe is too big a stretch in the brackets). A Dennis Carpenter Ford Reproduction car tailpipe bracket I have also indicates tailpipe sizes were 1 5/8" OD.

Hope this helps.

Cheers

[Stew Robertson]

Hi Hanno
I think there is a difference between 12 and 13 cabs
I have an original ford 12 pipe that the muffler slid over and
the muffler was welded on at each end
I will see if I can find the picture of the pipe