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SU Carbies
https://www.ausmini.com/forums/viewtopic.php?f=2&t=28526		 Page 1 of 1
Author:  Clubbie74 [ Sun Feb 25, 2007 7:21 pm ]
Post subject:  SU Carbies
A lot of older cars seem to have used SU carbies at some time or other. What, if any differences are there between the non mini ones and the ones that were originally fitted to mini's? I know the manifolds, control rods and needles and seats would change between models, is there anything else and what are the easiest ones to modify for use?
Author:  slinkey inc [ Sun Feb 25, 2007 9:09 pm ]
Post subject: 
Different parts, needles, this that and everything.

"SU carburetters tuning tips and techniques" has a section at the back for all part numbers for most SU's on most cars.

Weirdest stuff I've come across, is the HIF6 range. Most HIF6's from various cars are very different to each other. Mostly in dash pot height.

<edit> for Ben Afford's SC12 kit, from my experience in carby hunting, the best I've found to fit under the bonnet, in the HIF6 range are a volvo type, and the one I got myself, one from a Rover 3500 V8 car.
Author:  Mick [ Sun Feb 25, 2007 9:18 pm ]
Post subject: 
You need to be careful of the float bowl angle apart from the usual jet/needle tuning issues. Some carburettors were used on differently aligned manifolds. I think MG carbs and manifolds are a good example.
Author:  poeee [ Mon Feb 26, 2007 8:40 am ]
Post subject: 
Mick wrote:
You need to be careful of the float bowl angle apart from the usual jet/needle tuning issues. Some carburettors were used on differently aligned manifolds. I think MG carbs and manifolds are a good example.


What changes the difference in the angle? Is it the bowl or the carby body?
Author:  Mike_Byron [ Mon Feb 26, 2007 9:49 am ]
Post subject: 
The differences are the angle of the manifold and the way the carby sits on it. A HS6 carby of an Austin 1800 is virtually flat on its manifold and the fuel bowl sits directly up. Whereas on a mini the manifold is on an angle (13 degrees, I think) and the angle position of the fuel bowl is different so that the fuel bowl also sitting directly upright.

If you put a flat mounted HS6 on an angled mini manifold (and bolt it to the engine, of course) the carby will leak fuel every where because the float will not be resting against the needle and seat to stop the fuel flowing.

From memory, you need a different adapter between the carby body and the fuel bowl to get the angle right. Not a big job but the carby doesn't just bolt onto a mini without some fiddling.
Author:  Mick [ Mon Feb 26, 2007 10:06 am ]
Post subject: 
That's that little plastic anti-vibration ring thingy right?

Earlier models of carb are more difficult.
Author:  Wombat [ Mon Feb 26, 2007 12:03 pm ]
Post subject: 
Mick wrote:
That's that little plastic anti-vibration ring thingy right? RIGHT you buy the appropriate one for your application (Mini,Sprite MG etc)

Earlier models of carb are more difficult.
Author:  peterw [ Mon Feb 26, 2007 1:13 pm ]
Post subject: 
Quote:
From memory, you need a different adapter between the carby body and the fuel bowl to get the angle right. Not a big job but the carby doesn't just bolt onto a mini without some fiddling.
Quote:


I think it is a rubber piece and it would be to help with vibration. I remember modifying some MG carbs for my race car many years ago by modifying this piece. You could probably get them from any Mini parts place or Carbie specialist. You just need to have the float bowl sitting vertical.

Pete
Author:  Clubbie74 [ Mon Feb 26, 2007 4:25 pm ]
Post subject: 
Thanks, another book to buy and reading to be done. :roll:
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