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HS6 carbs

Posted by murphymgc

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HS6 carbs #1
murphymgc Daniel Murphy Montreal Quebec, Canada 1969 MG MGC 1969 MG MGC 1970 MG MGB	Posted: March 30, 2012 04:05PM Registered: 2 years ago Posts: 217

Gentlemen, I see from time to time HS6 carbs come up for sale,AUD 208, Aud 9 etc, My question is can any HS6 carb work on MGC .I believe that the true spec carb for MGC is AUD 28 for 68 model and AUD 342 for 69 .Where or what is the AUD208 from ex.

Curious

Dan

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Re: HS6 carbs #2
ga duke Mike Dooley Newnan, GA, USA 1969 MG MGC GT 2011 Nissan 370Z	Posted: March 30, 2012 04:33PM Registered: 5 years ago Posts: 352

Dan:

Don't have mine in front of me now, so can't be specific right now, also not an expert...but the short answer is " no...not all hs6 carbs will work on the MGC. Different bowl mounts, different linkages, different jets and needles, different piston springs, different throttle disks.
Can they be made to work?...yes with enough parts(money).

Mike Dooley

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Re: HS6 carbs #3
ron neal South Carolina, USA 1962 MG MGA MkII 1968 MG MGC 1969 MG MGC 1969 MG MGC 1969 MG MGC GT → more	Posted: March 30, 2012 07:12PM Registered: 4 years ago Posts: 3,273

Dan
Agree with Mike so when you shop for carbs (HS6) try to get ones that are close, ie float bowls at same angle, similar linkage, etc. You may need to change springs, needles, etc to get what you want.
I dont know what a AUD 208 fits but I am going to guess Volvo???? AUD 9 is Volvo.
MGC carbs for USA were as follows 1968 AUD 287 and 1969 was AUD 342. Inthe UK they were Aud150 for 1967/68 and AUD 341 for 1969.

Ron

Edited 1 time(s). Last edit at 03/30/2012 07:21PM by ron neal.

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Re: HS6 carbs #4
Big6Mark Mark Miller Springfield, OR, USA 1960 Austin-Healey 3000 1968 MG MGC "Red Tail" 1968 MG MGC 1968 MG MGC GT "The Wreck" 1969 MG MGC GT "The Lump"	Posted: March 30, 2012 08:16PM Registered: 5 years ago Posts: 1,220

Looked in my old Tuning S.U. Carburetters book and I couldn't find a listing for those carbs. An AUD 200 was used on a Volvo B18D - 122S in 1965/66, an AUD 202 in 1966/67 and an AUD 204 on a B18B - 1800S in 1965/66, so it could also be from a Vovo.

As far as I know, all S.U. HS6s are essentially the same, up to a point.

Up through 1968 they had fixed needles and after that they had spring loaded needles. The fixed needle carbs have a larger hole for the jet and the jet needs to be centered on the needle so it will not drag or bind the piston. (Not always easy.) The springloaded needle body has a smaller, centered jet hole and the needle is spring loaded to always be at the rear of the jet and sliding on the jet hole. (Makes for more consistent fuel metering and no need for centering, but wears the needle and jet in the long run.)

The springloaded needle carbs also are the ones with the side vacuum tap used to eliminate the PCV valve on the 1969 and later cars.

If you want to buy the necessary parts I think you can make just about any HS6 into a match for the MGC carbs. If you start with a fixed needle carb body you can build it to match the 1968 carbs and a spring loaded needle carb can be matched to the 1969 carbs.

The AUD 287 carb model specifies not only HS6, fixed needle, but the jet size and type, needle profile, mounting of the float at level and the type of throttle levers, choke levers, interconnect linkage, dashpot spring and damper specs. That also lists all the parts you may need to change to get another HS6 to be an MGC HS6.

This is my opinion, but if you were to check with Joe Curto (http://joecurto.com/) I think this would also be his answer.

C Ya,
Mark

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Re: HS6 carbs #5
ron neal South Carolina, USA 1962 MG MGA MkII 1968 MG MGC 1969 MG MGC 1969 MG MGC 1969 MG MGC GT → more	Posted: March 30, 2012 08:50PM Registered: 4 years ago Posts: 3,273

I have taken various HS6 carbs and changed them fit my MGC. Some are easier to convert than others as Mike and Mark pointed out. If you do a 3 carb conversion you will need to change needles and springs anyway.

Seems Jimmy Hilton is off the radar for a while. I sent some MGA carbs to Dana at SU Carbs and they look great (all polished up) but have not put them into action yet. I am sure Joe does an excellent job too.

If I am not going to show the car then I rebuild them myself. I dont have the patience to polish dashpots or send little stuff off to the plater without something ending up missing.

Ron

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Re: HS6 carbs #6
kobym Koby Millo Tel-Aviv, Israel 1969 MG MGC	Posted: March 31, 2012 12:14AM Registered: 4 years ago Posts: 531

Dan,

You might want to take a look here:

http://www.sucarb.co.uk/VehicleList.aspx?carManID=20&carModel=MGC&carYear=

Great site with lot's of information. Good price and great service, if you choose to order stuff from them.

Regards,

Koby

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Re: HS6 carbs #7
murphymgc Daniel Murphy Montreal Quebec, Canada 1969 MG MGC 1969 MG MGC 1970 MG MGB	Posted: March 31, 2012 06:58AM Registered: 2 years ago Posts: 217

Thanks Guys . I thought it was a easy or stupid question, but now at least i do not feel so dumb, this will be a interesting follow up, thanks for all you input,very much appreciated.

have a great week-end.

Dan

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Re: HS6 carbs #8
ron neal South Carolina, USA 1962 MG MGA MkII 1968 MG MGC 1969 MG MGC 1969 MG MGC 1969 MG MGC GT → more	Posted: March 31, 2012 05:18PM Registered: 4 years ago Posts: 3,273

Mystery solved. They are AUD 209 (TR4)

Ron

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Re: HS6 carbs #9
m.s.macrae Murray MacRae New Zealand	Posted: June 28, 2012 01:24AM Registered: 2 years ago Posts: 139

Some HS 6 have large bore needle valves and others have small bore valves..
Any one know which ones apply to MGCs?

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Re: HS6 carbs #10
kobym Koby Millo Tel-Aviv, Israel 1969 MG MGC	Posted: June 28, 2012 03:10AM Registered: 4 years ago Posts: 531

You might want to take a look here, at the WEB page of SU - the original manufacturer:

http://www.sucarb.co.uk/VehicleList.aspx?carManID=20&carModel=MGC&carYear=

You can get there information about the original spec of the carbs, needle etc.
Prices and service are also very good.

According to the site, 68 USA cars need KM needles, and 69 USA cars need BAD needles.

Reg.

Koby

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Re: HS6 carbs #11
mowog2 Drew Hastings Albion, Indiana, USA 1969 MG MGC	Posted: June 28, 2012 06:58AM Registered: 6 years ago Posts: 828

Sent a note to Jimmy on rebuilding a pair of HS6's for me and no reply....he must be taking a break from carbs.....

Drew

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