Rick wrote....."to retain the TR4A exhaust and found a TR4A intake to
>
> mount. If you go this route, you will need the Y-connector on the
> exhaust
> pipes."
I have a brand new exhaust Y-connector for sale if anyone is
interested in doing this conversion or if you simply need a Y-connector.
Bud Rolofson
71TR6 CC57365 (Good 6)
66TR4A CTC57806 (The Wreck-Almost parts)
66TR4A CTC57529 (The Project)
71F-250 Camper Special (Triumph Support Vehicle)
Z-50A Hardly Davidson 1977 Honda Mini-Trail Bike (Triumph Pit Bike)
levilevi@comcast.net
On Mar 17, 2010, at 12:00 PM, Rick wrote:
> Francois,
>
>
>
> The use of the superior TR4A intake manifold will bring performance
> benefits
> to your TR3A. However, the mod is a bit more complicated than it
> appears; I
> did it two years ago during my TR3A rebuild. Firstly, the TR4A
> intake AND
> exhaust manifold must be mounted together, as they are interlaced.
> The TR4A
> exhaust manifold is a superior design and is worth mounting on your
> Tr3A. I
> can absolutely confirm that the TR3A intake is NOT compatible with
> the TR4A
> exhaust manifold, and I believe that the converse is also true, but I
> decided at the time to retain the TR4A exhaust and found a TR4A
> intake to
> mount. If you go this route, you will need the Y-connector on the
> exhaust
> pipes. Secondly, you will need to use HS6 carburetors. The throats
> of these
> carbs were designed with the TR4A intake manifold in mind, and the
> ensemble
> fits nicely in the TR3A engine compartment. I used thin air
> cleaners, but I
> believe that the truncated-cone K&N cleaners will work as well. You
> will
> also have to change the throttle linkage, as the HS6 carbs use a
> center-pull
> arrangement. Jeff at PalTech can set up the linkage for you. Expect
> to pay
> just south of a grand to get the whole system on your car.
>
>
>
> Rick in Seattle
>
> 1960 Triumph TR3A
>
> 1970 BSA 441 Vistor
>
> 1972 Norton 750 Commando Combat
>
> 1975 Norton 850 Commando Mk3
>
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