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Exhaust pipe dimensions needed

Exhaust pipe dimensions needed

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Dozerman51
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Hello all,
I am far away from my D4/7U and D2/3J at the moment. If possible, could you give me the OD dimensions of the pony and main exhaust pipe that come out the top of the hood on the D4 and also the same dimension for the main pipe on the D2. I also am thinking of modifying a spare exhaust manifold I have for my D2 and having the pipe come out the top of the hood like on the U series D2’s. The dimensions would be used when ordering Spark Arrestors for these machines. Thanks in advance and hope you all have a great day. ??.
Joe Giraud
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Sun, Aug 25, 2024 11:22 PM
josh
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The D2 pipe dimensions are 2-1/2" OD for the main and 1-1/2" for the pony, these are a pair of the Hapco spark arresters I bought for one of my D2s, they were sold as pictured. 3AA for the big one 1AA for the pony. I don't have a D4 to measure.
Attachment
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Mon, Aug 26, 2024 5:45 AM
Dozerman51
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Thanks Josh. 👍👍👍
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Mon, Aug 26, 2024 7:46 AM
GrantJ
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Reply to Dozerman51:
Thanks Josh. 👍👍👍
Josh, does that spark arrester on the pony cut down on the bark? I dont mind the big engine sound but the pony is brutal. Interesting, Grant.
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Mon, Aug 26, 2024 9:27 AM
josh
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Reply to GrantJ:
Josh, does that spark arrester on the pony cut down on the bark? I dont mind the big engine sound but the pony is brutal. Interesting, Grant.
Spark arrestor on the pony helps a little, I still would not start one without earplugs.
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Mon, Aug 26, 2024 9:39 AM
neil
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Reply to GrantJ:
Josh, does that spark arrester on the pony cut down on the bark? I dont mind the big engine sound but the pony is brutal. Interesting, Grant.
Grant, I put a proper muffler on my D2 pony and it shuts it right up - you can hear yourself think with it.
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Mon, Aug 26, 2024 9:39 AM
trainzkid88
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Reply to neil:
Grant, I put a proper muffler on my D2 pony and it shuts it right up - you can hear yourself think with it.
i know the hotdog style muffler off a 5hp briggs and stratton fits in the pony exhaust just nicely. and it makes a fair difference to the noise.
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Mon, Aug 26, 2024 5:09 PM
trainzkid88
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Reply to neil:
Grant, I put a proper muffler on my D2 pony and it shuts it right up - you can hear yourself think with it.
yeah they deafen you without it.
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Mon, Aug 26, 2024 5:10 PM
trainzkid88
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Reply to trainzkid88:
yeah they deafen you without it.
it might sound strange but a bit of copper pipe works well as a muffler. especially if you cap the end and then come down a bit and drill several holes equal to the pipe area. so yes you need to use Pir2
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Mon, Aug 26, 2024 5:13 PM
neil
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Reply to trainzkid88:
it might sound strange but a bit of copper pipe works well as a muffler. especially if you cap the end and then come down a bit and drill several holes equal to the pipe area. so yes you need to use Pir2
What's Pir2, tk?
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Mon, Aug 26, 2024 7:19 PM
GrantJ
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Reply to neil:
What's Pir2, tk?
Niel, is there a particular muffler that you had success with and is it vertical or horizontal? I have been thinking about horizontal. For the pony a muffler would be fine since you would not be running a pony while moving thru the brush or woods, but I want to buy a proper spark arrester for the main engine.
This is a very interesting thread for me. Thanks, Grant.
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Mon, Aug 26, 2024 10:05 PM
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