[ROVERNET - UK] SU needle valve interchange MGC and P6 2000TC

[Vern Klukas]

HD carbs have free floats, but the needle valve is operated by a hinged lever.

HS carbs have hinged floats.

Needle valves are the same for pretty much all HD and HS carbs, the 
one proviso being that you check the bore of the seat. A valve from a 
HS5 carb will have a smaller bore than a HS8 carbs, which leads to 
running the bowls dry a highway speeds or sustained work.

Yours
Vern





>69 TCs had HS8
>Early TCs had HD8, like my 68.  The floats are hinged though.
>
>PVS
>
>----- Original Message ----- From: "Slatskars" <slatskars at comcast.net>
>To: <rovernet at lyris.ccdata.com>
>Sent: Tuesday, August 14, 2007 4:49 PM
>Subject: Re: [ROVERNET - UK] SU needle valve interchange MGC and P6 2000TC
>
>>Nathan,
>>
>>I am thinking that you have "H" or "HD" type SU's rather than "HS" 
>>type. The "H's" and "HD's" are the only ones with a free floating 
>>float. The float needles should be the same no matter what the 
>>size. You really do need to determine what type of carburetors that 
>>you do have. I have vehicles with all four types of SU's and know 
>>them reasonably well.
>>
>>A single HD-8 is used on 3 liter P-5's. Some models of Jaguar use 
>>dual HD-8's. A good source of information would be Moss motors as 
>>they stock parts for Jaguars also. I personally have had good luck 
>>with gross jets. I had a brand new set of H-4's that one of them 
>>would flood. I cleaned and checked the float needle everyway 
>>possible, but could not get it to function properly. Changed them 
>>over to Gross Jets and the problem went away. The car never ran 
>>smoother.
>>
>>Slats
>>----- Original Message ----- From: "Nathan Obuch" <nathanobuch at yahoo.com>
>>To: <rovernet at lyris.ccdata.com>
>>Sent: Monday, August 13, 2007 6:40 PM
>>Subject: [ROVERNET - UK] SU needle valve interchange MGC and P6 2000TC
>>
>>>Greetings, Rovernetters,
>>>
>>>I have a '69 TC with HS8 carbs (AUD254.) I am having
>>>trouble with my float bowls overflowing...the floats
>>>haven't sunk, so I'm pretty sure I need new needle
>>>valves. I noticed that the MGC also uses HS8's, so I
>>>was just thinking of ordering needle valves from
>>>Victoria British. I also noticed that in the
>>>illustration for the MGC, the floats are hinged to the
>>>float bowl lids, where as on my Rover, the floats are
>>>free floating- so I'm concerned that the needle valves
>>>might be different.
>>>
>>>Does anyone have a definitive answer?
>>>
>>>Nathan
>>>
>>>
>>>
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>>
>>
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-- 
Vern Klukas                             I'm a little . . .
Inkspot Type & Design
vern at inkspotco.com