1" black pipe for exhaust

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john2189
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1" black pipe for exhaust

Postby john2189 » Sun Aug 20, 2017 8:31 am

Has anyone made an underslung pipe from 1" black pipe? I have some, all id have to do is either bend it or use pipe fittings. would it work?

Or electric EMT conduit?

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Re: 1" black pipe for exhaust

Postby Mike in Louisiana » Sun Aug 20, 2017 9:17 am

There have been some pictures on here of it being done, but it dose not look very good. TM has the exhaust pipe for 136.00.
Might find a muffler shop that could do it, but dia might be to small.
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Re: 1" black pipe for exhaust

Postby ntrenn » Sun Aug 20, 2017 11:53 am

A good muffler shop will bend you one from a pattern for $50 or so. Last one i had done was from 1.5 inch. Factory was 1.375. I would not do 1inch...too small...

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Re: 1" black pipe for exhaust

Postby john2189 » Sun Aug 20, 2017 1:36 pm

ntrenn wrote:A good muffler shop will bend you one from a pattern for $50 or so. Last one i had done was from 1.5 inch. Factory was 1.375. I would not do 1inch...too small...

The threads in the manifold is 1" pipe thread... I have plenty of 1" pipe and 45* elbows.
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Re: 1" black pipe for exhaust

Postby bofahs » Sun Aug 20, 2017 2:04 pm

Sounds like you really want to do this, so let me try to discourage you! If I'm recalling correctly, the ID of a 1" sch 40 pipe is a few thousandths over 1 inch - say 1.04. A 16 gauge 1-3/8 tube is going to have an ID of 1.25. The actual tubing used in exhaust pipe may even have a thinner wall, but let's say 16 gauge. And yes, the adaptor is threaded to 1" pipe thread, but you'll be generating back-pressure all the way down the line - several feet. You're reducing the section size of the tube by 17% or so. You're also limiting exhaust flow by using 45's instead of sweeping turns.

You're starting out, under perfection conditions, in perfect tune, with 9 or 10 horsepower. That doesn't leave many to spare - it will run, but I think it will cost you in power, and in frequency of tune-ups.

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Re: 1" black pipe for exhaust

Postby Clownfish » Sun Aug 20, 2017 2:41 pm

If you have all of the material why not try it? All you have to lose is your time and if you don't try it you will always wonder if it would have worked. If it doesn't give the performance you expect just redo it with larger pipe. You often learn more when something fails than when it works. JMHO

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Re: 1" black pipe for exhaust

Postby radioguy41 » Sun Aug 20, 2017 5:40 pm

bofahs wrote:Sounds like you really want to do this, so let me try to discourage you! If I'm recalling correctly, the ID of a 1" sch 40 pipe is a few thousandths over 1 inch - say 1.04. A 16 gauge 1-3/8 tube is going to have an ID of 1.25. The actual tubing used in exhaust pipe may even have a thinner wall, but let's say 16 gauge. And yes, the adaptor is threaded to 1" pipe thread, but you'll be generating back-pressure all the way down the line - several feet. You're reducing the section size of the tube by 17% or so. You're also limiting exhaust flow by using 45's instead of sweeping turns.

You're starting out, under perfection conditions, in perfect tune, with 9 or 10 horsepower. That doesn't leave many to spare - it will run, but I think it will cost you in power, and in frequency of tune-ups.

Increased back pressure has the potential to lead to burnt valves as well.
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Re: 1" black pipe for exhaust

Postby john2189 » Sun Aug 20, 2017 6:08 pm

Ok but I think it comes from the factory with 1" pipe I think 17 " long, I know I'd be using at least two 45* elbows and it would be way more than 17" long
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Re: 1" black pipe for exhaust

Postby Peter Person » Sun Aug 20, 2017 7:21 pm

The 57 Loboy we had for a while had a custom underslung exhaust. Replaced it with an IH pipe I got from Columbia Tractor in Claverack, NY....back when they were about half what they currently are.

1957 LoBoy custom exhaust.jpg


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Re: 1" black pipe for exhaust

Postby LRiddle » Sun Aug 20, 2017 9:09 pm

My first thought is about the added weight. Using all that pipe is going to add a bunch of weight that needs to be supported at many points vs the oem style that is much lighter imho.
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Re: 1" black pipe for exhaust

Postby Matt Kirsch » Tue Aug 22, 2017 8:40 am

X2 for try it.

It's gonna look awful, but I doubt it will have a noticeable effect on performance. Free-flowing exhausts are only good for a few horsepower on engines developing hundreds of horsepower. Only noticeable on a dyno. On a Cub the difference will be a few HUNDREDTHS of one horsepower.

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Re: 1" black pipe for exhaust

Postby inairam » Tue Aug 22, 2017 9:50 am

I not sure it is worth the effort as is.

the newer manifolds have a larger thread before the elbow 1.25 i think and an adapter to bring down to the old size. if you are going to make the effort I my start with the 1.25 (1.38 id) to give you better flow

I had trouble finding a local muffler shop with tooling that size (auto and motorcycle ) that would bend an underling that small.

I am going vertical with a 1.25 pipe and use a muffler from a Ford jublee.
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Re: 1" black pipe for exhaust

Postby bob in CT » Tue Aug 22, 2017 12:21 pm

inairam wrote:I am going vertical with a 1.25 pipe and use a muffler from a Ford jublee.


I'm doing the same thing.

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Re: 1" black pipe for exhaust

Postby john2189 » Tue Aug 22, 2017 12:28 pm

Thanks for all your input. I found a complete underslung exhaust at a good price and I will install it.

Thanks,
John
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Re: 1" black pipe for exhaust

Postby inairam » Tue Aug 22, 2017 12:53 pm

Bob you gave me the idea! good to see you on the site. you have been quite for a while.
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