A C B - under hood muffler
Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=92540
Printed Date: 23 Aug 2025 at 12:42pm
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Topic: A C B - under hood muffler
Posted By: ac55tractor
Subject: A C B - under hood muffler
Date Posted: 17 Jul 2014 at 8:38am
Hi everyone, I have a 1955 Allis - Chalmers B.
I am considering removing my tall muffler and replacing it with an under the hood muffler. Before I get too winded. Does anyone know if I will run into any obstacles with this before I buy one? As I look at the under the hood muffler the exhaust pipe comes out on an angle and the top pipe is crimped. It looks as if it wouldn't take a rain cap very easily. I would appreciate any thoughts on this.
Thanks
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Replies:
Posted By: Darb210
Date Posted: 17 Jul 2014 at 9:18am
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I got one for my C from Sandy Lake Implement & loved it, I used the tractor mowing & have quite a few trees. I used some heat matt under the hood to keep the paint from peeling. The end is pinched, so you are correct on not easily putting on a rain cap. An old can of peas works good for a rain cap!
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Posted By: Charlie175
Date Posted: 17 Jul 2014 at 10:01am
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Ditto on the heat tape. I bent the pinch in out and out a ran cap on mine.
With the lower exhaust it does come back to your face so beware of that.
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Charlie
'48 B, '51 CA, '56 WD45 '61 D17, '63 D12, '65 D10 , '68 One-Ninety XTD
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Posted By: Steve in NJ
Date Posted: 18 Jul 2014 at 6:21am
There's a Stanley out there in the aftermarket that doesn't fit under the hood the B,IB,C,CA models, but it will fit under the hood of an RC. The RC having a much higher hood will net you the clearance needed. On the B/C models, that particular muffler will not fit because there is no hood clearance period. You can't even install the hood! Also, it doesn't come up through the hole in the hood correctly. Way off. I had this problem quite a few years back when I was doing my IB over. I did luck out and it did fit under the hood of my RC that's why I know...
Steve
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39'RC, 43'WC, 48'B, 49'G, 50'WF, 65 Big 10, 67'B-110, 75'716H, 2-620's, & a Motorhead wife
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Posted By: HD6GTOM
Date Posted: 18 Jul 2014 at 7:16am
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I had 1 laying in the shed for several years, took it off, after 2 or 3 hours of running the little tractor I got sick of the exhaust being blown in my face. Yes actually makes you sick.
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Posted By: TedBuiskerN.IL.
Date Posted: 18 Jul 2014 at 7:54am
There are two different oval mufflers, one for the WC, used on the side manifold, and a different style for the B-C. The one for the B-C is angled to provide hood clearance, but the heat shield is still needed to protect the paint.
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Most problems can be solved with the proper application of high explosives.
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Posted By: GregLawlerMinn
Date Posted: 18 Jul 2014 at 10:00am
I cut off a short piece of the inlet and extend the slot to get more clearance. Never noticed the exhaust in the face.
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What this country needs is more unemployed politicians-and lawyers.
Currently have: 1 D14 and a D15S2.
With new owners: 2Bs,9CAs,1WD,2 D12s,5D14s,3D15S2s, 2D17SIVs,D17D,1D19D;1 Unstyled WC
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Posted By: ac55tractor
Date Posted: 19 Mar 2016 at 3:56pm
Hi Everyone, I know it's been quite some time since I first posted here. A while ago I purchased an under hood muffler for my A/C B. I tapped the cramped end round with a ball peen and put a rain-cap on the end of the muffler. I am not running into issues with my paint pealing. Maybe it runs cooler that way. I read somewhere that the quicker that you can get air in and out of an engine the more efficient it will run. That is why some guys port and polish out there cylinder heads. Here is the thing that keeps coming to mind though. I often wonder if the muffler was designed with the crimp to create back pressure in the engine. I'm not totally sure about this concept of back pressure. Does anyone have any thoughts on this? Thanks in advance. Steve..........
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Posted By: wdtom
Date Posted: 19 Mar 2016 at 9:36pm
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I think I read something about the crimp being there for some reason but I can't remember what it was. As for the rain cap and exhaust in the face problem, how about putting a 90 degree elbow on the top with the end pointed to the left to get the exhaust more away from you? Cutting the end of the elbow at an angle with the short side on the bottom would help deep rain out without a cap too. This would add much height and might help.
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Posted By: Chalmersbob
Date Posted: 20 Mar 2016 at 10:29pm
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The crimped muffler is there to force the fumes up in the air and not back in your face. A clean running engine will not make you sick from the exhaust unless your in a closed building. Bob
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4 B's, 1 C's,3 CA's, 2 G's WD, D14, D15, B-1, B10, B12, 712S,
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Posted By: tractorman
Date Posted: 21 Mar 2016 at 8:42am
I suggest you empty that can of peas before you it it on the muffler
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Play on 38 B 49 WF , working on D14, D15 B10, Bee 12 B110. use 185 and 190
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Posted By: wbecker
Date Posted: 21 Mar 2016 at 9:18am
I have had the under hood mufflers on 2 Bs and 2 IBs, never had any paint problem and didn't have any sort of heat shield. The crimped end is there to increase the velocity of the exhaust to force it up so it's not in your face, it worked for me.
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Allis B, IB, Low B, G, D10, JD M, 8KCAB, C152
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Posted By: Scott B
Date Posted: 21 Mar 2016 at 11:02am
I'm of the same opinion on the muffler deal. That exhaust comes right back at you and after 2 or 3 hours of mowing you've forgotten what clean air smells like. Clean engine or not.
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D17 Series 1
Allis B- 1939
Allis B- 1945
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