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Crankcase pressure
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nortonfan



Joined: 24 Dec 2003
Posts: 362
Location: Brisbane, Australia

PostPosted: Sat Feb 19, 2005 11:51 am    Post subject: Reply with quote

Jason, I actually have some "mechanics tape" & have taken note of your good advice. I have yet to plug up any oil passages using it.

It is a bit bit like the mechanics silastic, used sensibly it fixes everything when used in conjunction with a simple maths formula & making sure your bike is on the sidestand of course Exclamation

Saw "Ray" a week or so back & enjoyed the movie.
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Guest






PostPosted: Sun Feb 20, 2005 9:13 am    Post subject: Reply with quote

Jason wrote:

The crankcase check valve that illf8ed mentioned actually allows some amount of air to be drawn into the crankcase. And partial filling the crankcase reduces the volume and thus the pressure of the air that must be expelled from the crankcase on the piston downstroke. A minor increase in horsepower is also realized as a result of the decreased pressure.

Jason


Could make sense.....those things have been on cars for awhile...but as mine spews a fair amount of oil up, at each start...and has for years, I think the PCV would just make a blockage for the extra oil and cause problems...better to leave it as is.....Peace! PS someday I have to figure out just what to do to fix this sumping thing...in a couple of years, I won't be able to get this thing kicked over anymore if I don't....
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Dwardo
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PostPosted: Sun Feb 20, 2005 5:45 pm    Post subject: Plumber's tape Reply with quote

Forget the plumbers tape. Replace the bolts with studs of the correct length. You can get them at any hardware store. One may have to be shortened, I don't remember. Loctite or Prematex them in, and there will be no oil leakage and the primary case will be held much more rigidly.
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Stuart SS



Joined: 21 May 2004
Posts: 270
Location: Australia's Far tropical nth

PostPosted: Tue Feb 22, 2005 12:02 am    Post subject: Reply with quote

http://jerrydoe.com/forum/viewtopic.php?t=468&start=15

As some one just said... there are some interweaved issues here!

An Understatement I feel ~
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The Unapproachable Norton Commando

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.