18-05-2018, 05:27 AM
For what it's worth we fitted a 1 1/8" to Dad's 1930 Triumph Super 7 in place of the old updraft Zenith and it made a world of difference. The car is now useable in modem traffic, much more get-up-and-go.
In fairness the Zenith was pretty worn, so I modified a damaged spare updraft manifold with a flange to take the side draught SU, the original manifold and Zenith is in the Triumph spares for the next custodian after I pop my clogs
Car starts on the button, is smooth and progressive right throughout the rev range and the pick up in power is markedly improved. It runs a high ratio diff and close ratio 3 speed box, so pull away was always a fiddle with the Zenith. It's a joy to drive and we are no longer a mobile chicane on the roads.
We run a pair of 1 1/8" SU's on the A7 race car with a balance pipe between them, engine reeves freely to 6 grand where I chicken out. I'm a big fan of SU's despite all my Alfa's running either Webers or Solexes
Aye
Greig
In fairness the Zenith was pretty worn, so I modified a damaged spare updraft manifold with a flange to take the side draught SU, the original manifold and Zenith is in the Triumph spares for the next custodian after I pop my clogs
Car starts on the button, is smooth and progressive right throughout the rev range and the pick up in power is markedly improved. It runs a high ratio diff and close ratio 3 speed box, so pull away was always a fiddle with the Zenith. It's a joy to drive and we are no longer a mobile chicane on the roads.
We run a pair of 1 1/8" SU's on the A7 race car with a balance pipe between them, engine reeves freely to 6 grand where I chicken out. I'm a big fan of SU's despite all my Alfa's running either Webers or Solexes
Aye
Greig