[Vwdiesel] Gasser's 'n' diesels'n' threads

[mark SHEPHERD]

Loren your point about 'head' in a carb is interesting; but I think wrong... at a guess most carbs operate on a suction process; so raising float level has little or no effect until you reach the point where  overfilling results in spillage into the throat that then means that idle screw adjustable leanness begins to disappear; ranging from an intermittant dribbling causing 'yellow flareups' on idle or fast idle; up to a permanent yellow flame. But I agree too low a float exposes the jets either at idle or under load. Just grab one of those transparent spark plugs [ I wish there was one for the diesel :o( ..] .
As for our VE heating connundrum.. the only simple way to find out if friction effect is greater than cooling effect is to insert a thermometer in a 'tee' on the return line a few cm from the banjo..If using a short run to a pickle jar then a thermometer on i/p (in pickle jar for ease) will give our i/p temp.  lag an area of the puimp near to the outlets and up stream of the 'lift pump' and a thermometer tucked underneath will give an estimate of  temp of post  lift pump but pre piston.
Come to think of it 'ow about the oil squirters peeing on the piston walls; isnt this similar?
The Miser(Uk)