Exhaust Flexible exhaust pipe

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DutchDude

Guest
I have done my searches, but I can't find any info on the flexible pipe used in the Hornet:

608_DSC00449_3.jpg


Does anyone have any ideas on what kind of pipe to use?

I have thought about perhaps using the flexible ducting they use for electrical cables, but I am worried about exhaust leaks? Perhaps I could cut the exhaust after the downward bend put in the electical flex duct on with a clamp, then mount the rest of the exhaust pipe next to the sprocket?

Let me know if you have better ideas?
 


azbill

Active Member
Joined
Dec 15, 2006
Messages
3,697
I believe that hornet made his pipe from conduit
it can be welded, but you need to grind off the galvinizing before heating or it will give off hazardous fumes
(bye-bye brain cells:rolleyes:)
I always thought using fexible copper to get the right config, and then transfering that shape to steel would work well
 
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A

andyinchville1

Guest
FYI - Flex pipe adds restriction to the exhaust (as opposed to smooth exhaust pipe) but it does make exhaust routing easier..
Andrew
 

azbill

Active Member
Joined
Dec 15, 2006
Messages
3,697
FYI - Flex pipe adds restriction to the exhaust (as opposed to smooth exhaust pipe) but it does make exhaust routing easier..
Andrew
that's why I said to use it to get the shape you wanted...then transfer to steel
(not to use it for final pipe)
 
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DutchDude

Guest
I looked for flexible gas pipe, but the only size that I could find is 3/4" - with an inside diameter of about 1/2". The electrical conduit comes in larger sizes.

I guess I can weld it if I have to - I just liked the look of the flex pipe.

How much extra restriction would we be talking about? Enough that it would matter?
 
G

gone_fishin

Guest
from several years of auto-exhaust experience: some flex tube can actually work to further "restrict" your exhaust...turbulance from the ridges hampers the flow.

i think "hornet" used more of a smooth-bore style of flex that prolly works ok...but if i needed an easy but nice-looking custom pipe, i'd go with conduit.
 
M

MotorbikeMike

Guest
Flex pipe and.......Fishtail??

Hi gang, that looks to me like the traditional Whizzer flex-pipe, and fish tail used in the kits prior to 1965.


Mike
 
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