Here's something that's puzzled me a while. I was in standing traffic on a hot day last summer. The oil temperature was well up and the oil light kept flickering on. Traffic began to move and as I pulled away there was a distinct chuffing sound from the rear which lasted only for a short distance and maybe 5-6 chuffs. I was expecting the worst but I stopped to examine it and found nothing untoward. I don't think it was the brakes, more likely engine (type 4) or transmission (it's an auto). It's not done it again since. Has anybody got any ideas about this? You can tell I'm bored.
It can be caused by the heat exchanges not quite seated tightly to the cylinder head...or so I'm told.
Maybe - I had them off not long before. Will check. What I've been thinking is whether this could have been the sound of an oil relief valve opening though I'd assume this would more likely happen at high pressure rather than low.
I don't know much about the Solex, but you can get air leaks around a carb that can chuff quite loudly in time with the engine's stroke. These gaps can close up or open up with heat, obviously they are also more obvious at idle. Try listening with the old hose pipe to the ear trick around the engine, like a stethoscope. One of my Weber's can make a fearful chuffing noise between the carb body and the centre of the spindle where the spindle exits then re-enters each choke. This isn't the sort of air leak that screws up the mixture, so it's not always obvious. I'm on my second attempt to get someone to fix this problem
