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New route for twin exhausts. #725455
02/13/18 6:25 pm
02/13/18 6:25 pm
Joined: Jan 2016
Posts: 9
North Wiltshire England
K
Kleftiwallah Offline OP
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Kleftiwallah  Offline OP
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K
Joined: Jan 2016
Posts: 9
North Wiltshire England
Modifying the Hotchkiss engine to twin carb' and twin exhaust. The time has come to apply exhaust tape to the first stage pipes (built the pipes from stainless steel). I could delay wrapping, but I wanna do it!

Watching 'how'it's done' on youtube, shows it being applied wet (or damp). The engine will not be run for some months yet, is it acceptable to let the wrap dry 'naturally' i.e without the heat of the engine to dry out the wrap.

I've checked the dimensions of our oven... and it's not big enough!

Over to you knowledgeable peeps. Cheers, Tony. confused

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Re: New route for twin exhausts. [Re: Kleftiwallah] #725473
02/13/18 8:42 pm
02/13/18 8:42 pm
Joined: Aug 2015
Posts: 1,057
Bolton Lancs UK
A
Andy Higham Online content
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Andy Higham  Online Content
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Joined: Aug 2015
Posts: 1,057
Bolton Lancs UK
IMHO there are two reasons to apply exhaust wrap
1 in a car to avoid setting fire to the engine bay
2 on a bike to hide crap welding


1955 BSA B31 500cc "Stargazer"
1962 Greeves 200cc "Blue Meanie"
1962/67 Greeves 350
1967 Greeves 360 Challenger
1984 Suzuki GSX1100 EFE "Sorcerers Apprentice"
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Re: New route for twin exhausts. [Re: Andy Higham] #725491
02/13/18 9:56 pm
02/13/18 9:56 pm
Joined: Aug 2001
Posts: 7,130
scotland
triton thrasher Online content
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triton thrasher  Online Content
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Joined: Aug 2001
Posts: 7,130
scotland
Originally Posted by Andy Higham
IMHO there are two reasons to apply exhaust wrap
1 in a car to avoid setting fire to the engine bay
2 on a bike to hide crap welding



You missed out 3: to be a hipster (whatever that is).


Amateur Loctite enthusiast.
Re: New route for twin exhausts. [Re: triton thrasher] #725495
02/13/18 10:01 pm
02/13/18 10:01 pm
Joined: Aug 2014
Posts: 1,397
OZ
Triless Online content
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Triless  Online Content
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Posts: 1,397
OZ
" to be a hipster( whatever that is)." Obviously those who use exhaust wrap !

Re: New route for twin exhausts. [Re: Kleftiwallah] #725496
02/13/18 10:09 pm
02/13/18 10:09 pm
Joined: Aug 2001
Posts: 3,641
argyll. scotland, uk
gavin eisler Online content
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gavin eisler  Online Content
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Joined: Aug 2001
Posts: 3,641
argyll. scotland, uk
I had to google Hotchkiss engine, nice bit of kit, I think there may be a valid reason for exhaust wrap on this, its a trike motor ( I think).
There's a 4th reason, cunning MZ 250 racers who are limited to a stock length front pipe, lag the pipe to keep heat in the exhaust gas, hotter gas travels faster and makes the pipe behave like a shorter one, this moves the resonance period to higher revs and gives an HP advantage, i quized a guy who had done his MZ like this, and that was his explanation.

Last edited by gavin eisler; 02/13/18 10:12 pm.

71 Devimead A65 750
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The poster formerly known as Pod
Re: New route for twin exhausts. [Re: gavin eisler] #726429
Yesterday at 04:42 PM
Yesterday at 04:42 PM
Joined: May 2013
Posts: 4,731
Rotherham - S. Yorkshire
Allan Gill Online happy
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Allan Gill  Online Happy
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Joined: May 2013
Posts: 4,731
Rotherham - S. Yorkshire
Originally Posted by gavin eisler
I had to google Hotchkiss engine, nice bit of kit, I think there may be a valid reason for exhaust wrap on this, its a trike motor ( I think).
There's a 4th reason, cunning MZ 250 racers who are limited to a stock length front pipe, lag the pipe to keep heat in the exhaust gas, hotter gas travels faster and makes the pipe behave like a shorter one, this moves the resonance period to higher revs and gives an HP advantage, i quized a guy who had done his MZ like this, and that was his explanation.


I beleive Mark Parker tried exhaust wrap on this monster, I am sure he said it caused a horse power loss, hopefully he will chime in. But normally you want to keep the pipe cool, hence the decision for ceramic coating.


beerchug
Re: New route for twin exhausts. [Re: Allan Gill] #726444
Yesterday at 07:08 PM
Yesterday at 07:08 PM
Joined: Jan 2006
Posts: 147
Kristiansund. Norway
A
Arnstein Online content
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Arnstein  Online Content
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Joined: Jan 2006
Posts: 147
Kristiansund. Norway
Ceramic coating does the same as wrapping, keeps the heat in the exhaust.. only costs more than the do it yourself wrapping. It seems to be a cool thing to do more than adding power.. haveĀ“nt seen proof of power gain so far.


Arnstein

BSA Spitfire MK3.800cc
Honda CB450T -71
Laverda RGS 1130cc -85
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