24-06-2019, 10:15 AM
Some of you may have seen my post about a REV counter and temperature measurement. Yesterday, we went out for a run with our local club, Renault Gourdinis, Porches, Fiats etc. The RN ran well, however on climbing a moderate incline for 10 minutes or so in 2nd gear did raise the temperature some what. Air temperature was 36 deg C and towards the top of the hill (about 400M climb) she started to miss and jump around. Fortunately, we made the top of the hill without holding anyone up and continued without problems. A long break for lunch, temperatures rising and another run, but after about 40 miles, another hill and some serious vapour lock problems. After wrapping some water soaked rags around the gravity fuel pipe, we continued for a few miles and we were then stuck !!. It was my wife who came up with the OBVIOUS solution. Why not remove the bonnet !! - Well that was so simple, it fitted behind the front seats perfectly and we continued on our way home much to the merriment to our French drivers.
The temperatures I was able to measure on reaching home:-
Ambient Air temp 39 deg C
Water 69 deg C (With the bonnet removed, I guess these had dropped to avoid vapour lock)
Manifold 74 deg C
Carburettor body 45 deg C
Fuel pipe 34 deg C
I think the culprit is the fuel pipe/ Bulkhead fuel tank temperature, because when cooled with a soaked rag, matters improve.
I am looking at 1). Placing insulation around the fuel tank
2). Replacing the copper fuel tube with some sort of insulated tube (Any ideas / suppliers for that ??)
3). Making some sort of heat insulator for the exhaust pipe (Flitch plates not fitted because they don't fit).
Any thoughts on the above appreciated. 1932 RN Saloon, 4 blade fan, new radiator (Modern core), ignition timing about right, Heatwave.
The temperatures I was able to measure on reaching home:-
Ambient Air temp 39 deg C
Water 69 deg C (With the bonnet removed, I guess these had dropped to avoid vapour lock)
Manifold 74 deg C
Carburettor body 45 deg C
Fuel pipe 34 deg C
I think the culprit is the fuel pipe/ Bulkhead fuel tank temperature, because when cooled with a soaked rag, matters improve.
I am looking at 1). Placing insulation around the fuel tank
2). Replacing the copper fuel tube with some sort of insulated tube (Any ideas / suppliers for that ??)
3). Making some sort of heat insulator for the exhaust pipe (Flitch plates not fitted because they don't fit).
Any thoughts on the above appreciated. 1932 RN Saloon, 4 blade fan, new radiator (Modern core), ignition timing about right, Heatwave.