NOS SU HS6 Carburettors

[richardlamsdale]

I just saw this listing on eBay for a pair of brand new HS6 carburettors. I'm in no way related to the seller, but I thought they might be of interest to someone. Not cheap, but they do look shiny.

www.ebay.co.uk/itm/PAIR-ROVER-P5B-V8-CARBURETTERS-AUD-233-MANUAL-CHOKE-NEW-NOS-CAN-BE-USED-ON-AUTO-/351277721001?pt=UK_CarsParts_Vehicles_CarParts_SM&hash=item51c9c8a5a9

My car's a 1968, originally with automatic but now with manual choke (these are manual choke, although thats the only difference apparently), but I noticed in the picture these have 5 bolt holes on the manifold mounting flange. My car has 4 in a square pattern, not triangulated like these.

I didn't know the manifold mounting arrangement changed - I was wondering if it changed with change of choke? Interesting as I'd assumed an HS6 was an HS6, just with differences in linkages for different cars - I hadn't realised there were different mounting patterns.

Does anyone know when it changed?

[Phil Nottingham]

Was not aware they had. My engine was from an early 68 and has the manual choke set-up. I have never looked to see if they are different!

[Simon H]

That's the 'elbow' end, not the manifold end...

[richardlamsdale]

Jan 31, 2015 0:12:44 GMT Simon H said:

That's the 'elbow' end, not the manifold end...

Ah, why didn't I think of that! Thanks Simon, that makes a great deal of sense. Well, hopefully the link might be useful for someone.

[Simon H]

A bit pricey for me but a fair price for what they are.

[johnwp5bcoupe]

Apart from the extra bits for the choke cable this is the only difference between the AED set up and the manual, it's a distance piece so the jet can't be screwed in too far as the AED set up has a different setting of the jet.

I have seen a few of these just bent out of the way

[richardlamsdale]

That's another mystery solved John. My car had the AED but it's been removed and converted to manual choke at some point. One carb had exactly that distance piece you show in the photo, whereas the other didn't. I had thought it might be some sort of anti-vibration tab to stop the jet adjusting screw moving, although I couldn't see how that might work in it's current mangled state. I've removed it now anyway as I've replaced both jets and the equally mangled carburettor adjusting screws.

Another question you may be able to answer. The fast idle screw is shown in the manual with the threaded end interacting with the fast idle cam. My car had the screw reversed so the head interacted with the cam. Either way it seems very difficult to get to as there's something in the way. Is one way better than the other, and was there a special tool for adjusting this? I have a very short screwdriver which just about works, but I can't help thinking there might be an easier way.

[barryr]

I changed both my fast idle screws for the later knurled ones as they were chewed and had lock nuts rather than a spring. Got them from Burlen and glad I did.

I think they should only be screed in from the top I'd threaded bit touches cam.

Hope I'm not misunderstanding you?

Barry

[richardlamsdale]

Thanks Barry, I think the thread touching the cam is the right way, as you say. Might look to get some knurled screws as that may help adjustment. I bought some off eBay but they at least came with springs.