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Exhaust pipe size


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#1 Macmagee OFFLINE  

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Posted May 06, 2017 - 08:50 PM

My 12 hp Briggs has threads in the block 1 inch what size pipe should I go with after that? I am thinking 1 inch and a quarter. And how long of straight pipe? I have seen guys on other sires say no more than 12 inches.
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#2 chieffan OFFLINE  

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Posted May 07, 2017 - 07:17 AM

Short 1" nipple and a muffler will thread right on the end.  No worry about ruining the threads in the block or cracking the block from the extra weight.  Will be able to hear tomorrow and the neighbors will still talk to you. :wave:


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#3 glgrumpy ONLINE  

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Posted May 07, 2017 - 12:31 PM

I" actual hole will be a 3/4" pipe size if you mean iron plumbing pipe. Sometimes one needs a 45* elbow to curve it out and clear hoods and such, all depends on what you have that you are using it on.


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#4 Cvans OFFLINE  

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Posted May 07, 2017 - 06:33 PM

If your going to add onto the exhaust you will want to keep it as light as and strong possible. If it vibrates a lot you can shorten or add to the pipe to stop the harmonics. 






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