01-10-2019, 09:27 PM
I made a special copper inlet manifold in order to fit a SU to the Chummy.
It's made from 28mm central heating bends, a "tee" piece and pipe, silver soldered together. The vacuum wiper take-off was added as well. The flanges were made from 8mm brass plate, drilled and filed to shape.
It all works remarkably well. No sign of stress fractures yet (but it's only been on for about 3000 miles) and reasonable gas flow.
It was the only way to get the SU on with enough head of petrol for gravity feed and fit it under the Chummy bonnet...…...
I have since purchased a genuine "Derrington" cast aluminium inlet manifold, made for fitting a SU to a vintage 7 but unfortunately, it's cracked. I ought to repair it as it might give me enough space to fit an air filter. Or it could be used as a pattern to have a batch cast - anyone interested??
It's made from 28mm central heating bends, a "tee" piece and pipe, silver soldered together. The vacuum wiper take-off was added as well. The flanges were made from 8mm brass plate, drilled and filed to shape.
It all works remarkably well. No sign of stress fractures yet (but it's only been on for about 3000 miles) and reasonable gas flow.
It was the only way to get the SU on with enough head of petrol for gravity feed and fit it under the Chummy bonnet...…...
I have since purchased a genuine "Derrington" cast aluminium inlet manifold, made for fitting a SU to a vintage 7 but unfortunately, it's cracked. I ought to repair it as it might give me enough space to fit an air filter. Or it could be used as a pattern to have a batch cast - anyone interested??