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).
Informational document comparing the efficiency and benefits of the Air-Maze air filter against whirler-type air cleaners.
| Identifier | ExFiles\Box 135\4\ scan0094 | |
| Date | 8th February 1926 guessed | |
| of air to the carburetor is only 800² divided by 4000² times .60 ounces or .024 (twenty-four thousandths) ounces—an amount so small that it has no practical effect on the carburetor action whatever. From this it will be readily seen that the Air-Maze requires no change in your carburetor setting—all others do. Generally speaking the dust removing ability of any Air Cleaner depends upon a number of variable factors having to do with the physical characteristics of the dust particles contended with, i. e.{Mr Elliott - Chief Engineer}, whether they are granular or flaky; the size of the particles and the concentration of the dust particles in the air—whether light or heavy, etc. For instance, if we take a fine cement dust (typical of a granular dust) with a medium concentration, a whirler cleaner will show about 40% efficiency, whereas if we take a flaky dust like flake graphite, the efficiency of the whirler will be about doubled—this for the same relative size particles. If we increase the concentration with either dust, the efficiency will be slightly increased. This is characteristic of all whirler cleaners, whether the whirl is produced by rotating mechanism, or by means of stationary vanes. Under similar conditions a properly adapted filter like the Air-Maze would show better than 90% efficiency in the first case; and the efficiency would be only slightly lowered with a heavy dust concentration than would be the case with a light dust cloud. In speaking above of the relative efficiencies of the whirler cleaners and the Air-Maze, we wish to make it clear that the whirler cleaner never equals, and—in the majority of cases—does not even approximate the cleaning ability of the Air-Maze under any atmospheric dust conditions to be contended with by the motorist, where the dust is thoroughly disseminated in the air. It should be understood also, that neither of the dust examples used—cement or graphite—are characteristics of atmospheric dust, and any tests ing capacity is so large that cars equipped with Air-Maze have traveled over 20,000 miles without any sign of needing cleaning, so far as any restriction is concerned. Air-Maze has operated two months at a stretch on street sweepers, without any attention whatsoever, where the dust accumulations in an average night's run is greater than a thousand mile run of a passenger car on dusty roads. And besides, this is a very important advantage of Air-Maze, it may be cleaned in three minutes time, when it becomes necessary to perform this operation—less time than it takes to fill a grease cup. So, this mythical plugging bugaboo loses its punch in the face of actual operating conditions. The man who buys an Air-Maze buys it for the specific purpose of saving money in repair expense; wear and tear on his engine; minimized carbon deposits, and their attendant valve grindings and carbon scrapings expense; lower mileage costs for lubricating oil; and the peace of mind that goes with the knowledge that his car is thoroughly protected against injury from oil dilution and abrasive dust. To such a man, Air-Maze will render a service he cannot obtain elsewhere. Probably the greatest argument why you should buy the Air-Maze is the fact that it is an application of a filter which was developed for, and which is being extensively used to clean the air in large public buildings, hospitals, industrial plants, and to protect large and expensive machines—turbo generators, compressors, etc., from the wear and tear occasioned by the dust in the air. It is a fair question to ask: “If the whirler cleaner is as efficient as claimed, why is it that not more of them are used; in fact, why is it, that not even one of them is used for the exacting service noted above?” The truth of the matter is that the whirler cleaner finds its only effective field in those plants, and for those purposes where | ||