05-05-2021, 09:26 PM
(This post was last modified: 05-05-2021, 09:27 PM by Bob Culver.)
I was given Vol 1 and 2 of Modern Motor Repair and Building , Newnes, about 1933.
A table in Vol 1 gives the A7 carb as 26VEGH. Based on an A10 carb I have these are the same as VA but dismantle into more separate parts. Slow run given as 60
in Vol 2 they did a road test of an RP? without rear body seams. Tinkered with the carb and timing and on successive short runs got up to 45 mpg (altho improveemnt probably due warming up) The carb has slow run screw at an angle. They changed the slow jet 80 to 60 and claimed it removed a flat spot.
In the late 1940s my father meticulously checked mpg. In the manner of the time we used to go for a Sunday sfternoon run , tootling along the very quiet backroads at just 25 mph or so (sometimes following cut down Model Ts with all the rugged up family and dog on the tray). My father reckoned the petrol consumption then was poor altho he regualrly got 50 mpg on long trips.
The Newnes book interesting as gives section dwgs of other 2 brg engines sv Minor, Singer 9, BSA 10 and 9, latter with 2 rolling bearings, crank single end fed without circular ducts!?
The book also gave braking distances from 30 mph 46 ft, 63% one up..... from memory our 40 to 68 ton trucks are only required to meet 50% but other do not dawdle in their path.
A table in Vol 1 gives the A7 carb as 26VEGH. Based on an A10 carb I have these are the same as VA but dismantle into more separate parts. Slow run given as 60
in Vol 2 they did a road test of an RP? without rear body seams. Tinkered with the carb and timing and on successive short runs got up to 45 mpg (altho improveemnt probably due warming up) The carb has slow run screw at an angle. They changed the slow jet 80 to 60 and claimed it removed a flat spot.
In the late 1940s my father meticulously checked mpg. In the manner of the time we used to go for a Sunday sfternoon run , tootling along the very quiet backroads at just 25 mph or so (sometimes following cut down Model Ts with all the rugged up family and dog on the tray). My father reckoned the petrol consumption then was poor altho he regualrly got 50 mpg on long trips.
The Newnes book interesting as gives section dwgs of other 2 brg engines sv Minor, Singer 9, BSA 10 and 9, latter with 2 rolling bearings, crank single end fed without circular ducts!?
The book also gave braking distances from 30 mph 46 ft, 63% one up..... from memory our 40 to 68 ton trucks are only required to meet 50% but other do not dawdle in their path.