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Which Su Needle For Twin 1.5 Hs4


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#1 Zami

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Posted 06 January 2021 - 09:01 PM

After I did a refresh on the motor I switched to an SW5 from a VP3 and from 10/5% ethanol unleaded to straight unleaded. Engine is a 1380, big valve Longman, 1.5/1 rockers. 10 to 1 compression. I noticed Plug color was running rich. I tried to adjust the jets but still runs slightly rich. Any recommendations for a fixed needle choice? I have a set of AC but I am concerned they will be to lean. The motor spends most of its time in the 4500+ rpm range running around in the countryside and open highways. So I had been running GB needles a long time before the refr

Edited by Zami, 06 January 2021 - 09:04 PM.


#2 timmy850

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Posted 07 January 2021 - 01:52 AM

GB and AC both seem a bit on the lean side, there isn’t a huge amount of difference between the two

For comparison the Cooper S police spec here had CP4 needles which are richer right across the board

It’s pretty much impossible to tell you what needles will suit your car without the use of an air fuel ratio gauge. My gauge lead me to pick a strange needle that seemed much richer than I’d of first thought.

#3 Zami

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Posted 07 January 2021 - 03:13 PM

My mistake I have been running BG needles for years before cam and fuel change now it shows rich.




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