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).
'F' cylinder tests, detailing various cylinder liner modifications and their results.
Identifier | WestWitteringFiles\V\December1930-February1931\ Scan016 | |
Date | 1st December 1930 | |
To R.{Sir Henry Royce} From HS{Lord Ernest Hives - Chair}/ACL. c. Sg.{Arthur F. Sidgreaves - MD} c. Wor.{Arthur Wormald - General Works Manager} Rg.{Mr Rowledge} c. HV. E.{Mr Elliott - Chief Engineer} ORIGINAL HS{Lord Ernest Hives - Chair}/ACL1/ADS.12.30. X3866. "F" CYLINDER TESTS We have just completed a two hours running test of various cylinder liner modifications with encouraging results. The schemes tested were :- (1) Clearance between base part of liner and cyl. block increased to .035 as suggested by R.{Sir Henry Royce} (2) Reduced foot tested in combination with No.1 also in combination with standard clearance for comparison. (3) Reduced foot and raised rubbers also in combination with (1) and in combination with standard clearance for comparison. (4) Six of the pistons were the long skirt type with the scraper ring at the top of the skirt and six were standard pistons. The two hours were run at 9/10 rated power i.e. 440 B.H.P. and 2250 R.P.M. and the last 5 mins. at full throttle. Close examination of the engine after the run revealed the following :- The cylinder block using the liners with the increased clearance between the liner and block were definitely better than the standard block and shewed no signs of the end liners being distorted. Nearly all liners with standard clearance shewed bright distortion marks extending round or partly round the cyl. base - particularly the two end cylinders. No water leaks past the rubbers occurred with this increased clearance. The reduced foot and raised rubber combined is also an improvement in reducing distortion marks. The long pistons with scraper rings at the top also greatly reduce any distortion marks. These pistons | ||