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RH 10 HEADS, ONE YEAR ONLY

 
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Jason Curtiss



Joined: 14 Jun 2003
Posts: 661
Location: HOUSTON, TEXAS

PostPosted: Wed Sep 01, 2004 9:19 am    Post subject: RH 10 HEADS, ONE YEAR ONLY Reply with quote

Does anyone know why Norton made the 850cc heads with the smaller 30mm intake tracks for only one year? I belive this head is designated RH 10 only the 1974 Commandos were equiped with them. Prior to and after 1974 all 850 heads had the larger 32mm intake tracks.

Thanks,

Jason
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nortonfan



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

PostPosted: Wed Sep 01, 2004 11:44 am    Post subject: Head Pages Reply with quote

Jason,

Dyno Dave has a good web page on some norton heads.

http://www.gis.net/~dynodave/nhth.htm

I am not sure if it will answer your question but it is a good site for general info about the heads.
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Jason Curtiss



Joined: 14 Jun 2003
Posts: 661
Location: HOUSTON, TEXAS

PostPosted: Wed Sep 01, 2004 1:19 pm    Post subject: Reply with quote

Thanks - and a nice web page it is. But it doesn't provide any clues as to why Norton made the RH 10 for only one year.

Jason
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dynodave



Joined: 28 May 2003
Posts: 139
Location: USA

PostPosted: Wed Sep 01, 2004 4:10 pm    Post subject: Reply with quote

Arrow

Last edited by dynodave on Mon Apr 11, 2005 5:04 pm; edited 1 time in total
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nortonfan



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

PostPosted: Wed Sep 01, 2004 4:31 pm    Post subject: Reply with quote

DynoDave,

I am no engineer but, maybe after the large porting on the combat heads, norton decided to go with smaller port sizes again.

Don't the "larger" ports in engine heads generally give more usable power in the higher rev range ?

And don't the "smaller" ported heads give more usable power in the low to mid-range ?

Your web page on Heads is a good thing and I am sure many others like myself appreciate the work you have shared with the world. I have often used it looking for information on norton heads, thank you.
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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.