SU HS6 Needles

tomti · Aug 11th, 2006, 12:12

Hi all.

A question for the more technically-minded among you ...

Is there a better needle than the stock B18 ZH for twin SU HS6 carbs when attached to a B18 bored out to B20 spec?

I spoke to a nice man at Burlen who basically said 'stick ZHs in them then take it to a rolling road and take readings with different ones 'til you find the best one'. Much as that might be the best move, I'm a) too tight to do such a thing right now and b) figured I can't be the only person with this configuration, so I might as well ask around and see what others have done.

And by 'ask around', I obviously mean 'ask the forum'.

Any suggestions gratefully received.

-Tom

Gordon Hunter · Aug 13th, 2006, 15:18

Hi Tom,

I have found the KD needles better in my P1800 than the ZD as a good temporary set up until I get the chance to experiment a bit more. However, as you probably know, standard needles in any hopped up engine are never going to release its full potential. I have recently acquired a whole load of different Needles from a bloke who used to build rally spec B series engines and will be experimenting to see which ones best match my set up. It'll be a bit of trial and error, but for my application, it sure beats the expense of hiring the services of a rolling road.
I strongly recommend too that you get hold of a copy of 'How to Build & Power Tune SU Carburetors' by Des Hammill ISBN 13 978-1-903706-98-5. (about £12) You should have no problem getting it through Amazon. I have found this book very informative and down to earth.

All the best,

Gordon

Glen Morangie · Aug 13th, 2006, 22:59

Try these links:

http://www.team.net/www/morgan/tech/tuning.html

with a link to download 'SUNEEDLE' a DOS based tuning program to play with.

and

http://www.teglerizer.com/triumphstuff/su/su_tune.htm

for another view.

Follow the links and you'll soon reach information overload!

Aug 11th, 2006, 12:12	#1
tomti New Member Last Online: Jul 5th, 2013 11:49 Join Date: May 2006 Location: London	SU HS6 Needles Hi all. A question for the more technically-minded among you ... Is there a better needle than the stock B18 ZH for twin SU HS6 carbs when attached to a B18 bored out to B20 spec? I spoke to a nice man at Burlen who basically said 'stick ZHs in them then take it to a rolling road and take readings with different ones 'til you find the best one'. Much as that might be the best move, I'm a) too tight to do such a thing right now and b) figured I can't be the only person with this configuration, so I might as well ask around and see what others have done. And by 'ask around', I obviously mean 'ask the forum'. Any suggestions gratefully received. -Tom

Aug 13th, 2006, 15:18	#2
Gordon Hunter Ex 1800 Register Keeper Last Online: Apr 29th, 2022 17:04 Join Date: Dec 2001 Location: Central Scotland	Needles... Hi Tom, I have found the KD needles better in my P1800 than the ZD as a good temporary set up until I get the chance to experiment a bit more. However, as you probably know, standard needles in any hopped up engine are never going to release its full potential. I have recently acquired a whole load of different Needles from a bloke who used to build rally spec B series engines and will be experimenting to see which ones best match my set up. It'll be a bit of trial and error, but for my application, it sure beats the expense of hiring the services of a rolling road. I strongly recommend too that you get hold of a copy of 'How to Build & Power Tune SU Carburetors' by Des Hammill ISBN 13 978-1-903706-98-5. (about £12) You should have no problem getting it through Amazon. I have found this book very informative and down to earth. All the best, Gordon

Aug 13th, 2006, 22:59	#3
Glen Morangie Economy motorist Last Online: Aug 13th, 2022 07:48 Join Date: Dec 2004 Location: London	Try these links: http://www.team.net/www/morgan/tech/tuning.html with a link to download 'SUNEEDLE' a DOS based tuning program to play with. and http://www.teglerizer.com/triumphstuff/su/su_tune.htm for another view. Follow the links and you'll soon reach information overload!

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