Main Motorcycle: Triumph TR7
Join Date: Feb 2012
Location: Norwich, England
Other Motorcycle: T140
Extra Motorcycle: Most of another T140
|Classic, Vintage & Veteran For Coventry and Meriden Models. Anything pre-Hinckley goes.|
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what you're suggesting is exactly what a "Charlie's" filter is.
It's a B25 filter (that was considered for the T120'40 apparently) shoved up the bottom of the tube.
I had an incident (partly my fault) where the rust from the unused part of the frame was washed down into the main tank. The Charlies filter caught the stuff but a post pump filter would have been too late.
Yes, but the system I'm talking about doesn't place the filter pre-pump, it places the filter between the pump and the crank. Just like Jap bikes, Ducatis, BMWs and just about all cars and trucks. If you let crap get into your oil tank it could get past the strainer at the bottom of the tank and damage the oil pump, but it won;t get any further. This type of filter doesn't do anything to increase the risk of crap getting to the pump, but it does eliminate the risk of crap getting anywhere more important.
Just to be on the safe side, I have a B25 filter in the frame (bought from TMS) as well as a Kirby Rowbotham filter. The reason being that I had loads of British bikes between the ages of 17 and 25, then loads of Japanese bikes up to about age 40, then several European bikes up to last year, then back to Triumphs again. Through all this use and serious abuse of motorcycles it has dawned on me that the most significant difference between British and all other engines is the oil filtration. Hence my double-filter system now.
I'm sure a filter on the return line is a lot better than nothing, but on the feed side, the oil is not only under constant pressure and with a totally full filter, but the filter is catching everything that you wouldn't want circulating around your engine, before it enters the return line. Kirby Rowbotham's own tests have shown what he describes as half a teaspoon of sludge in the crank sludge trap after 100,000 miles on this system. It makes sense to me anyway!
No, the B25 paper filter replaces the original oil strainer/screen. Once fully wetted (ie: moments after the tank is filled) the paper filter doesn't restict oil flow, as long as it is not clogged with crap. Obviously it is very imprtant to never let it get clogged with crap, which could happen more easily than a standard strainer. But with the big, feed-line filter, there's no reason why crap should accumulate at anything like the rate it does without it.
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