Joined: 14 Jun 2007 Posts: 415 Location: Boston, MA USA
Posted: Sat Oct 25, 2008 5:49 pm Post subject: New oil filter, new oil pressure...!
I've traditionally run Baldwin 474 oil filters on my 73 Commando. Got sick of puncturing the old filter with a screwdriver to wrest it off, and tried a K&N 153 (standard for most Ducatis, so I had a few in the garage for my SS).
Seems to work fine, but since installation my oil pressure is consistently about 7-10 PSI higher at all times (yes, I run an oil pressure gauge, and yes, I'm pretty anal about keeping track of oil pressure at all times....).
Not excessive (maybe 55 PSI first thing starting up but drops off fairly quickly), 45 or so underway hot, and 15 or so at hot idle. All of this is maybe 7-10 PSI higher than "usual."
Joined: 10 Nov 2006 Posts: 448 Location: west cumbria
Posted: Sat Oct 25, 2008 11:12 pm Post subject:
Brian,
I wouldn't have thought the filter should have any effect on the oil pressure as it's in the return leg? Unless it's a lot more restricitive and the returm is back feeding through the pump, couldn't do that could it?
If the oil pump has been losing pressure from the feed to the return then this could be possible if the new filter is more restrictive, if so the oil pump shaft or shaft bore is worn, time for an O ring on the shaft if you go back to the old filter.
Joined: 14 Jun 2007 Posts: 415 Location: Boston, MA USA
Posted: Sun Oct 26, 2008 5:02 pm Post subject:
Les, I'm game! Anywhere you can point me for how-to's on that process? I did see a great set of photo-instructions on oilpump gear-lapping by Norbsa that I intend to follow - is that what you meant? Any other suggestions will be much appreciated!
And we all know that this project means an upcoming series of 'help-me!' postings about various related nut removal, thread-restoring, what-the-heck-have-I-done, and other subjects which will be a wonderful primer for the newbies among us and showcase for Christian charity among the experienced usual suspects...thanks in advance, guys and gal(s).
Just want you guys to know, I drive 'em nuts on the airhead, Ducati, Harley, and Triumph boards as well (all of whom have wonderful folks but I still think this board is the best - and I mean that sincerely) - BrianK
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At the end of 1967 the Norton Commando was announced.
The Norton Commando was greeted with a certain amount of scepticism because on first sight the commando appeared to comprise of the old Norton Dominator twin cylinder engine mounted at an inclined angle in a set of new cylinder parts.
It was not realized that the new Norton Commando Isolastic method of engine suspension damped out all engine vibration and produced a machine which had uncanny smoothness for a vertical twin. In due course the critics were silenced and the Norton Commando had the distinction of being regarded as the first of todays so called superbikes. There can be little doubt that the original design concept of the Norton Commando has proved correct, since comparatively few modifications of any real consequence have been made since production commenced during 1968.
Now nearly 40 years later Norton Commando riders like us are a breed of our own, and as far as we are concerned its still more fun to go for a blat on the old Norton Commando, and fast. As a Norton Commando owner and enthusiast, my goal here is to promote and give credit to those who keep the Norton name going.
It is more deserving to give credit to the Commando itself, for after all these years it continues to be respected. The original Commando designers like John Favill are those who deserve the credit for developing this incredible motorcycle.
The Norton Commando Roadster and Interstate of the late seventies, never died. Although the Norton Villiers factory dispersed the tradition lived on. Today Kenny Dreer in the USA is developing the new 952 CC Norton. What a great looking bike this is, and its engineering is still based on the original layout. It will be interesting to see how the new 952CC Norton does in todays tough motorcycle market. One thing is for sure, I would own one if I could afford it.
