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Post by rmcgoun on Feb 17, 2022 23:12:09 GMT
Thanks Roger. Useful information and a potential (at least partial) solution to the awkward and messy job of changing the Pathfinder filter. Rob
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Post by Roger Holman on Mar 6, 2022 13:35:11 GMT
Todays lesson is taken from the book of Riley, but not sure of the or chapter or verse.
Following on from my other postings on this subject, I am pleased to report that DAG has been fitted with the Flexolite conversion, and a new fiter canister, supplied by Flexolite. The significant diffeerence between this canister and the preceding ones is the size. This canister is about as tall as the original Tecalamit filter, the significance of this will be revealed. The whole shooting match was fitted, together with some temporary additional instrumentation which records pressure across the filter, engine RPM, oil temperature.
I intend to produce a report, which will be shared between this Club and the RM Club, but suffice it to say that the conversion is now operating very satisfactorily.
I believe I have identified the cause of the bursting canisters, and isolated it; All canisters are built more or less the same way, some are of slightly heavier materials, but I think this is immaterial. They all consist if a filter medium, cardboard of some sort, normally in a concertina format, contained within the canister, and wond aaround a central core of steel/stainless/alloy to support this filtration material. The core is pierced with a number of holes to permit the passage of oil, once it has passed through the filter medium.
The big significant difference between filters is the total Cross Sectional Area of these holes. The smallest CSA measured was 288.85 sqmm, the largest, so far, 3442.5 sqmm. Quite a difference. We know from J.Joiner/Haddleton that the RMB oil pump is capable of delivering 3.5 GPM, and that is a lot of oil to push through a small hole, what will not go through the hole has to go somewhere, the by-pass valve in the filter head is the obvius choice, but that too is not over large. The filter canisters paid the price.
Any question will be answered.
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tjt77
Junior Member
Posts: 68
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Post by tjt77 on Dec 9, 2023 1:21:08 GMT
good quality modern oil filters are good for approx 100 psi... I cant see how a Riley 2.5 can produce this sort of pressure unless there is a blockage in flow preventing the oil from exiting the filter body after passing through filter ... has to be something up with the installation, because if you had that sort of pressure the old cannister would have leaked like a sieve..
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