What to use for exhaust pipe?

[tmbrcruizr]

How about a Robertson Torque tube. Not too expensive https://www.robertsonstorquetubes.com/minibikes

I sent them a flexible copper gas line prototype and Robertson made the perfect piece

 

[2old2care]

I’m still looking for a 3/4” pipe thread coupling that is not galvanized like this one for electrical conduit, nor as large an OD as a black plumbing fitting.
Anyone know of a source?

Yes - McMaster Carr - Black steel compact straight fitting :
https://www.mcmaster.com/standard-pipe-fittings/low-pressure-iron-and-steel-threaded-pipe-fittings/

 

[EricD..]

I sent them a flexible copper gas line prototype and Robertson made the perfect piece

Nice! Thats a neat way to mock it up. I bet the pipe looks great

 

[Minimichael]

Yes - McMaster Carr - Black steel compact straight fitting :
https://www.mcmaster.com/standard-pipe-fittings/low-pressure-iron-and-steel-threaded-pipe-fittings/

Anybody use aluminum NPT pipe? I've had the problem with iron NPT pipe rattling and chewing the threads out of my flathead Briggs & Stratton blocks, which are aluminum also. I'm thinking of a snug aluminum adapter fitting (something stubby) first installed in the block and then extended with more aluminum pipe and end adapter to receive a Briggs muffler. Could sort of patch the thread problem at the block, and relieve the stress from weight of iron pipe.

 

[EricD..]

Just got this one for my 1970 Roadster from black widow motor sports. Super nice piece.

 

[2old2care]

Anybody use aluminum NPT pipe? Could sort of patch the thread problem at the block, and relieve the stress from weight of iron pipe.

McMaster Carr to the rescue again :
https://www.mcmaster.com/standard-p...wall-aluminum-threaded-pipe-nipples-and-pipe/

 

[Minimichael]

McMaster Carr to the rescue again :
https://www.mcmaster.com/standard-p...wall-aluminum-threaded-pipe-nipples-and-pipe/

Yeah it's your links that got me thinking...

Something like this adapter, but in aluminum, could help repair the block threads, insulate the engine block from further damage, and isolate any new damage to the adapter itself.

Offers to keep it looking old-school, too...

 

[tmbrcruizr]

Nice! Thats a neat way to mock it up. I bet the pipe looks great

Thanks, as close to an Arctic Cat climber dog leg exhaust I could find

 

[71demon340]

Just use bicycle handlebars

 

[chipper]

Steal a shopping kart !

 

[gote 54]

most of the bike supply firms offer a pre- bent tubing kit that is far easier and less expensive than most other options.. that is if you don.t get extreme enjoyment form making things difficult... the link below is just an example of what is available to us builders... look around

https://www.ebay.com/itm/2844851643...2LE3mvC3V4CqMjclTKVO0B+Na3Kg|tkp:BFBMhOS6y9Ng

 

[sparkwizard]

I cut and mig weld old shopping cart pieces.

 

[IronDuke]

https://shop.advanceautoparts.com/p/walker-flex-tubing-sold-by-foot-40000/10082970-P

 

[Minimichael]

Beware of National Pipe headers...

 

[FOMOGO]

Beware of National Pipe headers...

Doesn't matter if its steel tubing or heavy pipe. You can't hang a header straight out of a flathead without a support strap.