andycon67 Posted May 10, 2014 Share Posted May 10, 2014 Has anyone got a needle number for a single SU fitted to a 1500 ? It's is actually a 1 3/4 hif as fitted to a MG Metro. Any help on needles for a 1500 will help as I have free flow exhaust and a k&n filter, electronic ignition apart from that engine is standard ish. ThanksAndy: Quote Link to comment Share on other sites More sharing options...
piman Posted May 11, 2014 Share Posted May 11, 2014 Hello Andy, judging by the lack of response your setup is not common?You may just have to do the selection by yourself. Start by setting the idle mixture, it doesn't really matter which needle as the idle dimension is much the same of all needles of that group. Don't be tempted to alter the mixture after getting the idle right, it will need a different needle unless you are very lucky. Either road test or rolling road if you are feeling flush.If you don't know of this, it will give some guidance and comparison between the various needles:- http://www.mintylamb.co.uk/upload/mintylamb.htmAlec Quote Link to comment Share on other sites More sharing options...
Nick Jones Posted May 11, 2014 Share Posted May 11, 2014 I thought that a single HS6 was fitted to some 1500FWD cars, but my Haynes SU book doesn't show it. Mind you, it doesn't show any single HS4s either and I know they existed! Another source shows only HS4 (AAK needle). Is your single manifold originally intended for a 1.75" carb or did you modify it to suit?Some experimentation may be needed though I have a vague recollection that John Thomason experimented with this combination along with several others and it being documented in the TSSC magazine - many years ago!Nick Quote Link to comment Share on other sites More sharing options...
piman Posted May 11, 2014 Share Posted May 11, 2014 Hello Nick, I have the S.U. manual and it does list some Triumphs with a single HS 4, although I forget exactly which, none with a single HIF 6 or HS 6. Alec Quote Link to comment Share on other sites More sharing options...
Nick Jones Posted May 11, 2014 Share Posted May 11, 2014 I could well be wrong about the HS6 ever being standard fitment on a 1500...... Your manual seems to be confirming that.Nick Quote Link to comment Share on other sites More sharing options...
andycon67 Posted May 12, 2014 Author Share Posted May 12, 2014 Dolly manifold so equal inlet tract, carb to manifold face machined out to 1" 3/4 from 1" 1/2 ,mini throttle linkage plate. Hope photos come out.I thought one of the 1500 Dolly had a single carb also, Mr Kipping had this set up on his Van.Andy Quote Link to comment Share on other sites More sharing options...
Deleted User Posted May 12, 2014 Share Posted May 12, 2014 wow, are you intent to keep the single carb? you mentioned performance! Rob Quote Link to comment Share on other sites More sharing options...
That Man Posted May 12, 2014 Share Posted May 12, 2014 A friend may years ago ran a 1380 Mini van with a single Hif7 (1 7/8"), no lack a performance there, 96bhp at the wheels.a single carb with the right manifold can work very well, as Mr Kipping found. With the added advantage of being easier to setup and maintain. Quote Link to comment Share on other sites More sharing options...
Clive Posted May 12, 2014 Share Posted May 12, 2014 Thomason was swapping a single hs4 for twins on a weekly basis when he was using his daily driver as a racecar (entirely successfully, iirc he won the championship once, maybe twice?)Anyway, his experiment was meticulous, and showed a single was slightly more economical, with a slight power loss. The differences surprisingly small.Kipping indeed used single hs6 carbs very effectively, and I suspect canleys will have the needle specs for a few setups, so worth a call. May even be online on the website, or in the old paper catalogue (mine still packed from our housemove :-/ ) Quote Link to comment Share on other sites More sharing options...
Toledo Man Posted May 12, 2014 Share Posted May 12, 2014 The 1500fwd has a single HS4. I can find out what needle was used.Toledos used AAK, AAW, ABF & ABQ if that helps. Quote Link to comment Share on other sites More sharing options...
andycon67 Posted May 13, 2014 Author Share Posted May 13, 2014 Thank you all for your reply's .I will look into needle numbers thank you.The engine it is going onto is bog standard 1500 so not looking for a power increase but an easier set up better on juice and only worse higher up the rev range which 1500 dont like as this one is standard ish. It has a DBL needle in at the moment MG Metro 1300 this is rich for a 1300 and i can compare needles on Minty.I have a set of twin 1"1/2 which will go on my played with 1500 (but not built yet) because that will be revving higher thus the single may or may not hold my back a bit but will try both.Thanks again for all your comments this forum is GREAT !Andy Quote Link to comment Share on other sites More sharing options...
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