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TR2/3/3A SU needle identification markings? H6's

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K

karls59tr

Obi Wan
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Do the SU needles that Moss sells have ID markings on them? Seems to me the last time I bought a set of RH needles from they were only marked on the zip lock bag but I could be wrong about that. Anyone know what The RH needles should have marked on them? In my collection of carb stuff I found a couple of used needles marked 369...I believe these to be the the ST standard needles correct???
While we're on the subject...When your running an exhaust header why is it advantageous to switch to RH needles for the carbs?
 
I got a set of RH needles from Joe Curto awhile back, but I don't recall if they were stamped or not. I suppose I could take apart one of my carbs and look. Anyway, the program that I use for SU needle comparison does not show a "369" needle. The RH needle runs a little richer then the standard SM needle, and it is used when engine mods require a slightly richer needle. I personally don't think that it is necessary if you are just running a header. I'm using RH needles, but besides headers, I have a 282° cam (it's pretty lumpy), have 87mm pistons, and the head is milled 0.085". The RH needles are quite adequate for those engine modifications as I have a wide band O2 sensor that shows I'm getting good AFRs throughout out the operating range.

Here's the needle comparison program that I use...

https://www.mintylamb.co.uk/suneedle/
 
The "369" needle is from Beck Arnely and is the same as the SM SU needle. Beck Arnely produced the needles supplied in their carb kits and had their own ID numbers. If you google "Beck Arnely needles", their is a cross reference chart to SU. Actually, there are some errors in the chart, as some of the needles are for ZS carbs.
Berry
 
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