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waynem 
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Joined: 03 Aug 2011
Location: Milwaukee WI
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 Topic: Raincap for underhood muffler
Posted: 22 Nov 2011 at 7:55am |
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Hi all I have a 1939 AC b with an underhood muffler. Does anyone know of a raincap to fit on the rectangular opening of the muffler? Thanks in advance Wayne
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1939 Model B
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Dans 7080
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Joined: 05 Feb 2010
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Posted: 22 Nov 2011 at 11:06am |
Cut the top out of these!!
You may try the rain cap of of a 6670 6680 or 6690 Agco. They have kinda of a rectangle outlet on the muffler.
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RockyBottomFarm
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Joined: 16 Oct 2011
Location: Fall Creek WI
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Posted: 22 Nov 2011 at 12:02pm |
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Can I get a pic of your muffler?
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38 & 41 B, sickle mower, 2 way plows, rear field cultivator, 2 row drill planter
40 Combine
66 Combine
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cmsmoke
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Joined: 19 Feb 2011
Location: Johnstown, Pa
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Posted: 22 Nov 2011 at 12:20pm |
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I installed a raincap on my "C" with that muffler. I made the square outlet round by driving a piece of round stock or the right size deep well socket (check to see if it fits inlet first...they are the same size) into the outlet, then tap around the outside with a hammer to make it round and relieve it some to be able to pull out the round stock. Then put a standard rain cap on it.
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Travis(NE)
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Location: Seward NE
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Posted: 22 Nov 2011 at 3:19pm |
I did kinda the same thing cmsmoke mentions.
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Hartland Farm
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Location: Tennessee
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Posted: 22 Nov 2011 at 3:31pm |
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The reason the exhaust pipes are mashed to an oval on these tractors is to cause the proper back pressure on the engine. The way we run these tractors as collectors it doesn't make any differerence but to get the best preformance from any engine it must have the right amount of back pressure.
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RockyBottomFarm
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Location: Fall Creek WI
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Posted: 22 Nov 2011 at 3:39pm |
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Still waiting for pic of muffler.....
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38 & 41 B, sickle mower, 2 way plows, rear field cultivator, 2 row drill planter
40 Combine
66 Combine
Roto Baler
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Orange Blood
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Location: ColoradoSprings
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Posted: 22 Nov 2011 at 4:06pm |
 Hartland Farm wrote:
The reason the exhaust pipes are mashed to an oval on these tractors is to cause the proper back pressure on the engine. The way we run these tractors as collectors it doesn't make any differerence but to get the best preformance from any engine it must have the right amount of back pressure. |
I am curious I always thought back pressure was a bad thing, no matter how little there was? Can you help me understand how some is good?
Anthony
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Greg (Hillsboro, OH)
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Joined: 11 Sep 2009
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Posted: 22 Nov 2011 at 4:32pm |
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Rocky, go to the link for parts at the top of this page, and go to tony carbaughs site and look at the mufflers there. you'll see a picture of the B underhood muffler there.
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JimD
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Location: Mounds, OK
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Posted: 22 Nov 2011 at 4:50pm |
 Here's the one we run on our 38B.
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waynem
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Location: Milwaukee WI
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Posted: 22 Nov 2011 at 5:12pm |
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Rocky I can't get a picture tonight but it looks just like the one Jim posted. I would like to keep the original rectangular shape of the muffler.
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1939 Model B
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Chalmersbob
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Posted: 22 Nov 2011 at 10:05pm |
The early B didn't have a muffler, they used a straight pipe. Prior to engine # BE43896.
The under hood muffler started with engine #bE43896 thru tractor # 114400. then they went to the thru the hood muffler.
Having the pipe pinched closed also will not let much rain enter the muffler.
Talking about back pressure, a friend of mine put 3" dual exhaust pipes on his Suburban and his gas mileage got worse then with the stock exhaust. Bob
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SHAMELESS
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Posted: 23 Nov 2011 at 3:11am |
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shucks...just put a soup can over it with a small chain or wire screwed into both...when ya start it, it'll blow off and stay until ya put it back on!
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CTuckerNWIL
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Posted: 23 Nov 2011 at 3:23am |
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Who needs a raincap on a tractor muffler? The wife's car sets outside and the B goes in the garage.
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Jeff Z. NY
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Posted: 23 Nov 2011 at 4:20am |
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Right.
And if it's raining I don't run the tractors.
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cmsmoke
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Posted: 23 Nov 2011 at 5:21am |
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I don't believe making the outlet of the exhaust round hurts or changes the backpressure enough to worry about. The area of the opening is the same. The exhaust direction changes slightly outward into a fan shape when it is flattened. That is the place the backpressure would change, slightly. How many tractors were missing mufflers from the early start of life and still running strong today? Some didn't even have a muffler when they were new.
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Steve in NJ
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Posted: 23 Nov 2011 at 6:44am |
Dan has a pretty good idea with the Black Pepper can. One of those would probably fit right over the end of the tube. I just cut the top off a plastic water bottle and place them over the pipes of the Tractors after they cool down. This way if I forget to take one off and start the Tractor and have "lift off", it doesn't hurt anything. Boy, they launch too! Don't ask me how I know that.... LOL!
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B26240
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Posted: 23 Nov 2011 at 7:03am |
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As far as the pinched pipe relating to back pressure you may be right , I have had several WC's with the squashed pipe and noticed the noise is much less than with just a round pipe. Could this be the reason they pinched the end ?
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