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Needle choice for 1 1/2" SU
https://www.ausmini.com/forums/viewtopic.php?f=2&t=49059		 Page 1 of 1
Author:  64cooper [ Thu Jan 08, 2009 6:29 pm ]
Post subject:  Needle choice for 1 1/2" SU
What would be the needle choice when running the 1"1/2 SU on an 1100 standard trim engine for normal day to day driving? I'm replacing the 1"1/4 on the 73 "S".
Author:  grey 64 [ Thu Jan 08, 2009 6:58 pm ]
Post subject: 
Hi David, I have no idea.
Just thought i'd say hello. :D
Author:  74snail [ Thu Jan 08, 2009 7:29 pm ]
Post subject:  ADC
ADC is the needle ! As recommended by Russell at MinisRus
Author:  64cooper [ Thu Jan 08, 2009 8:54 pm ]
Post subject: 
Hi Ant
thanks for the christmas message, nice thought.
Author:  BALLISTIC [ Fri Jan 09, 2009 7:49 am ]
Post subject: 
Do you know if its a fixed or floating/spring needle??
Author:  64cooper [ Fri Jan 09, 2009 8:25 pm ]
Post subject: 
It is a fixed needle and if it wasn't, I would be converting from floating to fixed, a job I have done in the past.
Author:  drmini in aust [ Fri Jan 09, 2009 9:58 pm ]
Post subject: 
Vizard suggests use a red spring with M1 or BQ needle.
If head modded he says H6 or AN.
Of course the filter used will affect this too.
Author:  simon k [ Fri Jan 09, 2009 11:19 pm ]
Post subject:  Re: ADC
74snail wrote:
ADC is the needle ! As recommended by Russell at MinisRus


no good for a fixed needle carb

64cooper wrote:
It is a fixed needle and if it wasn't, I would be converting from floating to fixed, a job I have done in the past.


here's the chart for the ones Dr Mini has listed

http://www.morrismini.com/SUNeedlesV2.aspx?linklist=AN;BQ;H6;M1;

you can see that H6 and M1 are so close there's no real difference, AN would be a good economy needle, BQ would give good full-throttle response

from my little bit of dyno testing, our motors spend most of their time around station 3-4, so those needles are roughly the same

as soon as anything is modified from standard, it's all vaguely educated guesswork
Author:  74snail [ Fri Jan 09, 2009 11:30 pm ]
Post subject:  HA
OK for a fixed needle HA is the one, exactly the same profile as the ADC and again as recommended by Russell from MinisRus
Author:  drmini in aust [ Sat Jan 10, 2009 5:43 am ]
Post subject: 
Before people ask WHY we use the earlier fixed needles, it's because they don't wear themselves and the jets away like the floating ones do.
When this happens they run rich, rich, rich... :lol:
And I've read this can happen in 20,000 miles.
Author:  AWOODY [ Sat Jan 10, 2009 7:26 pm ]
Post subject: 
We have a standard 1100 +40 with 1.5 su aand a NO.4 needle , it's very good.
Author:  64cooper [ Sat Jan 10, 2009 8:51 pm ]
Post subject: 
Thanks for the replies fellas and Doc, thanks for saving me having to explain why I prefer fixed needles.
Author:  Leighton [ Sat Jan 10, 2009 9:33 pm ]
Post subject: 
how do you tell the difference between the two?
Author:  simon k [ Sat Jan 10, 2009 10:02 pm ]
Post subject:  Re: HA
74snail wrote:
OK for a fixed needle HA is the one, exactly the same profile as the ADC and again as recommended by Russell from MinisRus


HA is very much like an AN - leaner than the others under higher throttle openings... better for a car with a standard head I guess, as it has less air flow, therefore can't handle as much fuel

added to the chart ;)

http://www.morrismini.com/SUNeedlesV2.aspx?linklist=AN%3bBQ%3bH6%3bM1%3b

leighton wrote:
how do you tell the difference between the two?

lift the piston out, if the needle is springy, then it's not fixed ;)
Author:  drmini in aust [ Sat Jan 10, 2009 10:12 pm ]
Post subject: 
No need to lift it out, just lift the piston with 1 finger and wiggle the needle with another.
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