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Twin SU's - What is this?
https://www.ausmini.com/forums/viewtopic.php?f=2&t=24410		 Page 1 of 2
Author:  GT [ Fri Nov 03, 2006 12:44 pm ]
Post subject:  Twin SU's - What is this?
Just busy rebuilding a set of Twin HS2's.

I have always wondered, but never asked.......what is this for?

Image
Author:  Namibian CAMEL [ Fri Nov 03, 2006 12:45 pm ]
Post subject: 
Cigar holder?
Author:  GT [ Fri Nov 03, 2006 12:51 pm ]
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It could be an ancient form of torture. Stick your finger in and never get it out again! :lol:
Author:  pristic [ Fri Nov 03, 2006 12:54 pm ]
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Doesnt the hose go through there? Its on the heatshield right?

Peter.
Author:  Wombat [ Fri Nov 03, 2006 1:04 pm ]
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Not on mine - If small enough is it the choke cable holder?
Author:  GT [ Fri Nov 03, 2006 1:10 pm ]
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pristic wrote:
Doesnt the hose go through there? Its on the heatshield right?

Peter.


I thought that, but I have never seen a fuel hose going through there on others twin HS2's. It's about the right diameter. Is it supposed to be bent up like that?

Yes it's on the heatshield.
Author:  pristic [ Fri Nov 03, 2006 1:22 pm ]
Post subject: 
It does look a little bent :)

And yes, most dont have lines running through it even if its there :) maybe theres a few more HP by going around it :D

Peter
Author:  Namibian CAMEL [ Fri Nov 03, 2006 1:31 pm ]
Post subject: 
I don't have it on mine either.
Author:  simon k [ Fri Nov 03, 2006 2:33 pm ]
Post subject: 
it's for what I think is a small vacuum reservoir used by the vacuum advance dizzys, but not fitted to S's and GT's. You see them sometimes, a little round thingy in-line with the vacuum line
Author:  drmini in aust [ Fri Nov 03, 2006 4:22 pm ]
Post subject: 
They were only used on early cars, 850 Cooper & Deluxe, on the vac line to the dizzy. I never did rip one apart to see what it is..... :lol:
Author:  graham in aus [ Fri Nov 03, 2006 4:53 pm ]
Post subject: 
As far as I know Kev, they are just an empty bulb, I think the idea is to act as a bit of a reservoir of vacuum as you are on and of the throttle, thus dampening any positive and negative pulses of vacuum / atmospheric pressure.

Did that any make sense??? :lol:
Author:  drmini in aust [ Fri Nov 03, 2006 4:55 pm ]
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were they only used on twins? I think it was on my 850 with 1 carb as well.
Author:  graham in aus [ Fri Nov 03, 2006 5:05 pm ]
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Yea, single on 850's was probably the most common, just off to shed, I think I have one knocking around, distributors often had screw thread on vacuum diagphagm to match metal pipe / nut with taper thingo!

997 and 998 were the twins, as S's didn't hav vac adv!! :P

Graham 8)
Author:  simon k [ Fri Nov 03, 2006 5:07 pm ]
Post subject: 
drmini in aust wrote:
were they only used on twins? I think it was on my 850 with 1 carb as well.


I think I've seen them on minors with 1 carb....
Author:  graham in aus [ Fri Nov 03, 2006 6:03 pm ]
Post subject: 
Heres a pic of the bulb thingo on one of our 850's:
Image
It connects to the dizzy via the metal pipe
Image
Here's the connection on a 997 cooper dizzy! :P
Image

Cheers

Graham 8)
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