[TR] H6 vs HS6

Bill Beecher bill_beecher at flash.net
Mon Jan 29 19:25:03 MST 2018

Thanks to all for the good input on the H6 and HS6 carbs.  It sounds like there is a difference but not all that much if you mis-match the shorter HS6 to the shorter TR3 manifold.  The challenge may be the center operated linkage change to use the HS6.  Looks like Andrew has some good ideas and pictures in that department.


Love this list!



From: Andrew Uprichard [mailto:auprichard at uprichard.net] 
Sent: Monday, January 29, 2018 1:10 PM
To: 'THOMAS Fansher' <tfansher at comcast.net>; 'Bill Beecher' <bill_beecher at flash.net>; triumphs at autox.team.net
Subject: RE: [TR] H6 vs HS6




I have two running TR3s – one with H6 and the other with HS6s.  The car with the HS6s (and the TR4 manifold) is much quicker, but then it has additional modifications.  I was told that, all things being equal, you will  get more bang from your buck with the HS6 carbs.


Andrew Uprichard

Jackson, Michigan


From: Triumphs [mailto:triumphs-bounces at autox.team.net] On Behalf Of THOMAS Fansher
Sent: Monday, January 29, 2018 12:01 PM
To: Bill Beecher; triumphs at autox.team.net <mailto:triumphs at autox.team.net> 
Subject: Re: [TR] H6 vs HS6


Bill, the H6 carbs on a stock intake manifold have the same length as the HS6 carbs on the longer TR4 intake manifold. I wish I had known this before I converted my TR3A to the longer intake and HS6's The thought at the time was that using the longer intake allows more mixing of the air/gas and then more even burning so more power. I have measured both set ups and they are the same. You don't have enough room in the inner fender to mount the longer H6 carbs to the TR4 intake. I think that the shorter carbs on the shorter manifold would give less power for the above stated reason. But how you spirited you drive might make a difference, too. You do have to rework the choke, which is a pain. I'd go with the original set up ( and did on the latest acquisition).
Tom Fansher who needs to sell the 1960 TR3A white with black interior

On January 29, 2018 at 11:11 AM Bill Beecher <bill_beecher at flash.net <mailto:bill_beecher at flash.net> > wrote:

Starting to revive a 1960 TR3A motor that has be on the shelf for a number of years and have arrived at the SU carburettors.  I find I have complete pairs of H6 and HS6 units that I could use so I would like to pose the question:  Which would be preferred using the original TR3A/H6 intake manifold?  


I heard noise in the past that the shorter carbs on the TR3 manifold would hamper performance.  Any truth to that?






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