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).
Letter from Lindbloom Auto Parts Co. concerning air leakage past intake valvestem guides and its effect on engine performance.
| Identifier | ExFiles\Box 158\4\ scan0236 | |
| Date | 1st June 1938 | |
| Republic 5308 1360 Vol. 5 No. 8 KEEPING AEROPLANES FIT TO FLY Lindbloom Auto Parts Co. 6440 South Artesian Avenue CHICAGO, ILLINOIS JUNE 1 1938 Dr. R.W.H. Bailey Gentlemen: I am aware that engineers generally tend to belittle the amount of air that leaks past the intake valvestem guides, but my experience and experiment show that the air that does enter the intake chamber in this way is in sufficient quantities to seriously upset the gasoline mixture and cause much trouble, due to the resultant uneven explosions and inability of the engine to handle such variations in mixtures and give efficient performance. I have just attended the Air Show and in examining the intake stems in the engines found that they all had sufficient play in the guide to allow a large amount of air to be drawn in, and considering the distance of the carburetor from the intake chambers there is no question but that it is done and in large quantities. This is particularly important in aeroplane service, where an immediate and full pickup is vital. When the pilot shuts off his motors in an emergency and expects an instant pickup, the engines are unable to give 100% response when the intake chambers have different mixtures due to the leakage of air. Facts about Lindbloom Valve Packing for the Engineer. Thanking you for your attention, I remain, Yours very truly, A.{Mr Adams} C. LINDBLOOM. | ||