RM 2.5 Oil Filter

[Harris]

The standard RM 2.5 takes a Fram CH801PL oil filter

[tjt77]

given the convenience and superior qualities of 'modern' disposable 'spin on' filters.. allied to the number of known 'problems' related to sealing and oily mess with the original multi piece cannister filters.. its no brainer to convert to modern spin on filter.. perhaps the most cost effective route to upgrade for simpler and cleaner routine servicing .. kits to achieve this are readily available in Uk for all rileys..

[Roger Holman]

I feel a tad guilty that I have not contributed to this thread before, but, in a way, I have. I have posted elsewhere about the trials and tribulations I have had with the RMB Tecalamit Filter, and my efforts to 'upgrade' to a modern 'spin-on' type filter.

It is probably enough to say that, after blowing six, yes! six, 'spin on' filters apart, and spilling a considerable quantity of sqeaky clean engine oil in three streams along the road through our vilage, I have reverted to 'standard' and re-fitted the Tecalamit filter.

I do not know the reason behind these filter failures, although I want to find out. Once the world reverts to a more sensible approach to life, I will pick up the cudgels again.

My engine has good oil pressure, (bottom end fairly recently rebuilt by Formhalls) supported by a test with an independant OP gauge, but it does have an oil cooler fitted which some believe maybe contribute to the problem.

My advice concerning the fitting of a filter conversion is, at this stage, wait. I know that there are a number of options available, some of which are operating perfectly, but the behavior of filter canisters which I have experienced would lead me to think carefully about the relationship between the output pressure (and volume) of the RMB oil pump, and the pressure rating and throughput capacity of spin-on filters.

[Roger Holman]

I think it is about time I added to this thread.

I have not recieved any answer to my query elsewhere concerning the output (ltrs/min) of the RMB oil pump so I aim to try to find out myself.

A week or so ago I recieved a telephone call from a man at Flexolite. He explained that Flexolite had been taken over by Vintage Supplies, and, as I was listed as a customer of both, he was making a call to find out if everything was OK! I treated him to the story of my failure to make the Flexolite adaptor work, and we agreed that I would pack the whole lot up, together with a Tecalamit filter, and send the whole lot back to him for examination and appraisal.

I have had a response, and I am fairly heartened. It seems that the filter canister which was supplid by Flexolite, with the conversion, and all the subsequent canisters tried, have been judged to be too small. I am being sent, I am advised, a new, much longer canister which equates closely in size to the Tecalamit filter housing.

I am looking forward to the arrival of this filter, and hopefully, being able to work out the cross sectional area of the holes in the tube which supports the filter medium. I think this might be the crucial factor, it is amazing that three similar filters I have disected exhibit available cross sectional area of these holes between 288.85sq mm and 2013 sq mm.

I do not have a spare filter element for the Tecalamit filter to hand, but I will measure it when it comes back to me, and compare. I am very nearly convinced that it is the inability of the canisters I have been using to pass a large enough volume of oil, which has caused the problem. We shall see.