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Main : Mechanical : Engine reducing-diameter manifold

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reducing-diameter manifold
reducing-diameter manifoldPopular
SubmitterddgonzalMore Photos from ddgonzal   Last Update2008/5/20 6:30    Tell a friendTell a friend
Hits1922  Comments9    0.00 (0 votes)0.00 (0 votes)
You know you want one

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The comments are owned by the poster. We aren't responsible for their content.

Poster Thread
kululadotgroen
Posted: 2008/5/20 8:59  Updated: 2008/5/20 8:59
No life (a.k.a. DattoMaster)
Joined: 2006/7/12
From: Cape Town ZA
Posts: 1054
 Re: reducing-diameter manifold
If the transition from the large pipe to the smal one is smooth inside, then these will excelerate the inlet gasses a great deal. It should give good mixture and spread in the chamber, which should give a nice torque figure.

Poster Thread
wolki101
Posted: 2008/5/20 9:11  Updated: 2008/5/20 9:11
Home away from home
Joined: 2006/11/18
From: ACT Aus
Posts: 944
 Re: reducing-diameter manifold
yeh that makes sense. so is it more for the torque down low then?

Poster Thread
kululadotgroen
Posted: 2008/5/20 9:29  Updated: 2008/5/20 9:29
No life (a.k.a. DattoMaster)
Joined: 2006/7/12
From: Cape Town ZA
Posts: 1054
 Re: reducing-diameter manifold
I think the reducing diameter was more a consequence of the way the manifold had to be made than intentional...

Poster Thread
steveo
Posted: 2008/5/20 11:23  Updated: 2008/5/20 11:23
No life (a.k.a. DattoMaster)
Joined: 2003/10/13
From: newcastle, NSW
Posts: 1695
 Re: reducing-diameter manifold
'VERY NICE!' As Borat would say!

Looks like they're for mikuni's or something similar?

I could be wrong.

Poster Thread
D
Posted: 2018/6/27 12:03  Updated: 2018/6/27 12:03
No life (a.k.a. DattoMaster)
Joined: 2002/10/28
From: Melbored
Posts: 10082
 Re: reducing-diameter manifold
artisan quality of yesteryear, today this kind of work scares many

Poster Thread
ddgonzal
Posted: 2018/7/1 22:30  Updated: 2018/7/1 22:30
Moderator
Joined: 2001/5/3
From: Hawaii, USA
Posts: 29364
 Re: reducing-diameter manifold
I think Kulula's hit it on the nail
Quote:
I think the reducing diameter was more a consequence of the way the manifold had to be made than intentional...
If you start with stock 28mm ports, and your bike carbs are 32mm, then a reduction is necessary

Intentionally done it raises low-speed power, put lessens top-end power. So less HP

Poster Thread
cheater_5
Posted: 2008/5/20 6:46  Updated: 2008/5/20 6:46
No life (a.k.a. DattoMaster)
Joined: 2005/8/8
From: The garage, NZ
Posts: 1935
 Re: reducing-diameter manifold
looks like motorbike carb setup. interesting pipes

Poster Thread
sidedraught
Posted: 2008/5/20 8:09  Updated: 2008/5/20 8:09
No life (a.k.a. DattoMaster)
Joined: 2004/9/4
From: sydney
Posts: 3095
 Re: reducing-diameter manifold
Shame its for a round port head.

Poster Thread
wolki101
Posted: 2008/5/20 8:33  Updated: 2008/5/20 8:33
Home away from home
Joined: 2006/11/18
From: ACT Aus
Posts: 944
 Re: reducing-diameter manifold
whats the reason for the reducing diameter pipes?