Grand Prix 500
Main Motorcycle: 1973 TR7
Join Date: Jul 2012
Location: Hickory Creek, TX
|Classic, Vintage & Veteran For Coventry and Meriden Models. Anything pre-Hinckley goes.|
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Here's my thoughts for what they're worth: Extra oil capacity seems to me a definitely good thing. One of the main mods John Young carried out to his Iron Butt Rally T150 was to almost double the volume of the oil tank. His near-10,000 miles in 11 days journey was through all kinds of weather, not only desert heat but cold rainstorms. The results, in his case, seem to indicate that there was certainly no harm in increasing oil capacity and very probably quite a lot of good in it.
Whether the T140 frame has a better cooling effect on the oil or not, to have reduced the oil volume compared to pre-OIF models seems a backward step. I didn't previously realise that Triumph had intended to have the filler neck behind the steering head as per B50/TR5T etc., though it always seemed illogical not to have done so. Why they chaged this design to what we ended up with seems a bit of a mystery. The principle that increasing the oil capacity to at least what the pre OIF T120s had seems unquestionable to me.
I don't like the idea of leaving the return pipe outlet where it is, and submerging it in oil. The B50 OIFrames had the return pipe up by the filler, and a breather a little higher up (not far above the maximum oil level). I rode a B50 for over 20,000 miles and never had any problems with oil escaping from the breather, and never noticed any oil frothing. That was up to 1983, so 'modern' oils weren't available then, it was plain old Duckhams Q.
I had a T140 frame modified to have the filler by the stering head (Nick Parravani did the modification work - this included re-routing the return pipe, blanking-off the original filler neck, and adding a new filler neck and breather pipe copied directly from my B50). Unfortunately I had that frame grit blasted and stove enamelled and when I found loads of grit inside, I couldn't bring myself to risk using it and sold it. It must be out there somewhere, reg: PEX 751R if anyone knows where it is! I have a spare frame and I might well do the same thing again - I'll wait to hear what your findings are first though LoveCuba!
Think again on extra oil for the OIF.If you make a cylinder shape to the quantity of oil you want.Put an oil pipe size junction at the top and bottom,connect the oil return hose to the bottom and the other end of the hose to the top.Fit the cylinder in front of the oil tube frame,or sideways.No problems with oil too high,dipstick exactly the same,no problems at all.I have done this type of thing using large diameter copper tube.The oil temperature after 20 miles at 70mph is 32 degrees c in the oil tube.That is very cool but seems to have no problems running that temp with a 20/50 modern oil
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