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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ALL NEW FRAME & RUNNING GEAR
The 1971 Triumph Bonneville oil-in-frame and TR6 (also oil-in-frame) got an entirely new one-piece, all-welded steel frame that held the engine oil in its huge 3" diameter backbone, instead of in a separate oil tank, as before. Great idea in concept, but somehow the boys at Umberslade Hall couldn't figure out how to keep the oil from foaming & so relocated the oil filler cap from just behind the steering head to just under the nose of the seat, lowering the oil level & abandoning all that internal volume in the large portion of the backbone under the tank. So this enormous 'drain pipe' of a backbone that was supposed to be filled with oil was now filled about halfway, leaving the new bike woefully in short supply. Another big problem with the new Triumph Bonneville oil-in-frame was that it raised the seat height to 32-1/2", too tall for many riders.
|I would have preferred the new engine to have been endowed with an oil pump which would have obviated the problems associated with that sometimes temperamental horror which is a feature of all Triumphs, but Turner dug in his heels. I had many other problems on my hands, so without more ado it was not long before we had prototypes running on test and were planning production for September, just eight months from the point of conceptual design. However, once the new engine was fitted into the frame, which was also of new design, it proved to be a real shaker. Time was not in our favour, yet our development team, then headed by the great Frank Baker, managed to compromise with a passable degree of roughness which we knew that the public would accept.|
Hmmmmmmmmmmmmm! Seeing as the engine will be fully overhauled and I have had the frame blasted have ordered the 'Çharlie' filter from Tri-Cor. Cheap insurance? So, along with the Norton style filter on the other side of the pump, I'll have the cleanest oil in Kiwi Land, Bonnie wise!
Hi John A,
Question here is why was it foaming and where was the return line (and how was it) plumbed into the 'scud missle' tube?
But I wouldn't be surprised if the timing side bearing failures that were quite common were at least partly due to oil breaking down due to so little of it circulating. Those failures were blamed on various things including the increased pounding the bottom end took when enlarged to 750, and on inferior cages that were spot-welded together. Some truth in both I'm sure, but probably also some truth in less than ideal lubrication?
the charlie's, norton, or both/
the Charlie's as a B25 BSA filter, the Other ( I think) is a 2cv filter. I'd need to look at the number on mine.
Plewsy fitted a smaller filter to his bike and if you watch the video, you can freeze frame and read the number. Or I think I asked him the number in his thread on the video
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