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Subject: "Waxstat Carb Jets (SU models)" Archived thread - Read only
 
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Conferences Spitfire Hangar Spitfire Mechanicals Topic #73
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Vegaman Dan
Charter Member
5 posts (Mixes own "Waxoyl" with ear wax, Vaseline and lard)
Jan-02-01, 11:39 AM (PST)
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"Waxstat Carb Jets (SU models)"
 
   Okay, I've seen waxstat jets mentioned a lot online and they are in both good and bad opinions. It seems that they are used as stock on some models and not on others. Needle selection will be made by matching them to the jets.

My question is, what the heck are waxstat jets? What's the difference between those and 'standard' jets? What are the identifying marks? Advantages/disadvantages?


Vegaman Dan
68 Spitui!


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f8speed
Charter Member
Jan-02-01, 03:15 PM (PST)
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1. "RE: Waxstat Carb Jets (SU models)"
In response to message #0
 
   Hi Vegaman Dan,

I think the Waxstat jets were originally designed for emissions
control, were the device controlled the jet position via a wax
substance, which would adjust the jet to the needle during warm up
depending on the ambient starting temp. This some how compensates for mixture during choking and full run.
I have HS6's on my Spit6. that came with Waxstats, but changed over to standard jets. I had no problems with the former, but
was told they could become problematic in time. So, I broke the
rule of "if it ain't broke, don't fix it". It's just that I really have a problem with EM stuff.
I know this isn't much help, and perhaps inaccurate, but it may send you with a base for research.

Timo


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Richard & Daffy
Charter Member
1434 posts (An "official" TTN Senior Wrangler)
Jan-03-01, 03:14 AM (PST)
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2. "RE: Waxstat Carb Jets (SU models)"
In response to message #0
 
LAST EDITED ON Jan-03-01 AT 03:22 AM (Pacific)

Waxstat jet-equipped SUs were fitted to later 1500s in the UK (and presumably most other markets apart from North America). I think this was to improve emissions, basically by making it impossible for incompetant owners to bugger up the settings. The mixture setting is fixed, and cannot be adjusted - which is why most people have junked them for the earlier design which can be set by hand.

I'm not sure exactly how they work (carbs are a mystery area to me, the one area of Spit maintenance I've never really got to grips with), but there is something about there being wax in there that expands with temperature to adjust the mixture? In any case, I guess they can't work that well, or they must be unrealiable or something, otherwise why would people remove a device that sets itself in favour of something that has to be set?

I believe they can be identified by a red cover at the bottom (and presumably by not having the adjusting nut). I can't be sure, since mine were replaced before I bought Daffy.

Richard and Daffy


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ceejay
Charter Member
Jan-03-01, 06:38 AM (PST)
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3. "RE: Waxstat Carb Jets (SU models)"
In response to message #2
 
   I have waxstats on my HS4 carbs. On the non-wax jets the tube is slender and (on my old HS2s) had a red end. The waxstats are much thicker at the base with a flat bottom and no colouring (see the Rimmers catalogue.

I assume they use some substance which is temp related as do many radiator caps. Either way I have no problem with mine so I'm keeping em.


Chris
(NVS 350M - UK based Mk IV)


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Vegaman Dan
Charter Member
5 posts (Mixes own "Waxoyl" with ear wax, Vaseline and lard)
Jan-03-01, 10:56 AM (PST)
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4. "RE: Waxstat Carb Jets (SU models)"
In response to message #3
 
   Red caps are standard. Gotcha. That's what I was looking for- some easy means to identify them in the parts boxes. Now comes the fun choice- needle selection! Time to figure out all the letter codes!


Vegaman Dan
68 Spitui!


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rogerstanton
Charter Member
Jan-05-01, 10:09 AM (PST)
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5. "RE: Waxstat Carb Jets (SU models)"
In response to message #0
 
   If you're waxies are in good order & you're running a standard motor then keep them.
One of the disadvantages of waxies is that they can't be adjusted. They may have a factory perfect adjustment for a factory engine. But an old tired engine you need to adjust the mixture. Also a tuned motor with high-lift cam etc will require a different feed


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