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).
Proposed engine and chassis developments, focusing on cooling system improvements.
| Identifier | ExFiles\Box 161a\4\ scan0138 | |
| Date | 5th October 1936 guessed | |
| (2) E/Psn. will say how much the top of the cylinder crown should be dropped to maintain the same compression ratio as now. Cooling System. A development is in hand for taking all of the cooling water from the front end of the cylinder heads to the radiator which would eliminate the top water rails, thereby saving cost and weight. This will be incorporated in the four stud four port head design and will be made if possible applicable to present production. An experimental report is required on the improved end covers to LeC.5200, which are intended to improve the coolant flow on the exhaust sides of the cylinder heads on production engines. A development is required of the Chevrolet type of coolant jet for concentrating the water flow on the exhaust valve seats. This means a jet arranged for cooling of exhaust valve seat, and the remaining water holes concentrated at the rear end of the block to equalise the flow. Design Department should look into this application with respect to present production head and the four port head On the long wheelbase chassis the bonnet has been increased in width at the rear by 2" and the plinth plates have been cut back to allow free air flow past the frame. In addition there is less blockage by the front of the engine due to the increase of the bonnet width. The effect of these modifications on cooling should be investigated. A report is also required on the effect of using a wire gauze screen behind the radiator shutters to improve the appearance by obscuring the diagonal stays. Instructions have been issued to LeC.5258, for using diagonal stays behind instead of in front of the radiator. In this scheme the horizontal stay at the front has also been left out to obtain a completely clean effect, but experiments should be made to find out whether this is required for mechanical stiffness. | ||