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H4/H6 Carb identification


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I need a rebuild kit and am trying to identify if I have H4 or H6 carbs without taking them off the car. There are no tags anywhere.

 

1956 TR3 but no gaurantee that they are the originals.

 

I have measured the inlet diameter as 1.587 inches by removing the air filter.

 

Any one know which they are?

 

Thanks

 

Ian

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Some illustrated parts lists for you. Peter Taylor's drawings are pretty much spot-on.

 

Cheers

Peter W

 

H4 Type - https://www.moss-europe.co.uk/shop-by-model/triumph/tr2-4a/fuel-system-induction-controls/carburettors-manifolds/carburettors-air-cleaners-h4-su-tr2.html(2 stud mounting to manifold)

 

H6 Type - https://www.moss-europe.co.uk/shop-by-model/triumph/tr2-4a/fuel-system-induction-controls/carburettors-manifolds/carburettors-air-cleaners-h6-su-tr3-4.html(4 Stud mounting to manifold)

 

HS6 Type https://www.moss-europe.co.uk/shop-by-model/triumph/tr2-4a/fuel-system-induction-controls/carburettors-manifolds/carburettors-air-cleaners-hs6-su-tr4a.html (Which you could have as they fit OK - Choke cable comes in over the top of the carbs and has flex tubes between float chambers and carb main jet)

Edited by BlueTR3A-5EKT
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Bob,

With any SU I've come across, the carb intake is not the carb 'size'.

The 'size' is the diameter of the manifold mating flange/butterfly.

Quite what science dictates the smaller intake orifice I really don't know, but

1.59" is what my H6 carbs are on the air filter side and 1.75" on the manifold

flange side.

Cheers

Roger

 

I have a feeling this could be the start of a very interesting in-depth technical discussion - I'll sit back & wait!!

Phil.

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Its definitely only H not HS. I had already worked that one out from watching the Moss YouTube video.

 

https://www.youtube.com/watch?v=dfLecCi0ppI

 

They did say that the inlet diameter was smaller than the outlet so that was a bit of help but what they didn't mention was the two / four stud difference.

 

Ian

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