[TR] H6 vs HS6

Andrew Uprichard auprichard at uprichard.net
Mon Jan 29 12:10:09 MST 2018



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
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> 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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