[TR] H6 vs HS6

[THOMAS Fansher]

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?
> 
>      
> 
>     Cheers,
> 
>     Bill
> 
>     TS75131E
> 
 

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