She ticks over very smooth, and the engine sounds lovely on low revs. But when you put your foot down quite hard you can hear the carb suck.
We spent a long time setting tje timing and getting the carb set right so that she starts, stays running and ticks over smoothly.
I have a petrol engined 1950 Commer too, she is a very smooth runner. She has the oil bath air cleaner fitted to the carb. Just to see what happens we ran her and took the air cleaner off. The same thing happened, runs smooth on tickover but give her some throttle and you can hear the carb sucking and she doesnt run well.
The main point that I have been wondering is that I have a book for the 15cwt and it has an air cleaner, I have a book for the 3 tonner and that has an air cleaner, I dont have a book for the 30cwt so cant check but my Commer came with an open carb, I wonder why that is and wonder should it have one as the others in the range?