From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Fitting and testing a cooling system bye-pass pipe for a 40/50 chassis.
| Identifier | Morton\M3.6\ img044 | |
| Date | 10th June 1919 | |
| To R.{Sir Henry Royce} from EH. c. to CJ. c. to BN.{W.O. Bentley / Mr Barrington} c. to E.{Mr Elliott - Chief Engineer} c. to DA.{Bernard Day - Chassis Design} ORIGINAL EH2/LC10.6.19. 10th. June 1919. 4 BYE-PASS FOR 40/50 CHASSIS. X.3563 X.3565 X.3456 We have fitted a pipe to form a bye-pass in the pipe leading to the radiator to the suction side of the pump. We have made this bye-pass the same internal bore as the outlet pipe leading to the cylinders to the radiator i.e. 1.25". We formed liberal sized "T" joints where this pipe joins to the main circuit. We ran the car on the road with the bye-pass pipe on and off. The results were:- 1. The standard system - radiator fully exposed. Water temperature 57ºC. 2. Conditions exactly as above except with the bye-pass pipe fitted. Water temperature 64ºC. We found the only way we could bring the water up to the desired temperature of 80 to 85ºC was to fix a baffle in the pipe leading to the radiator. We had to reduce the hole from 1.25 to .7 before the water reached 80 to 85ºC. when leaving the cylinders. This means that with the bye-pass we should have to follow the same scheme as on the "Packard" and have the control valve in the radiator circuit as well as in the bye-pass circuit. The valve might be arranged as follows, so that it will only be necessary to have one valve to operate. [Diagram of a T-junction pipe] To cylinders To radiator Bye-pass R.R. 235 A 100 (T) (S.F. 575. 16-4-19) C. 2354. | ||