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Any diff between a Weslake and a Noursh-Weslake? #367947
04/13/11 2:41 am
04/13/11 2:41 am
Joined: Jul 2006
Posts: 1,106
Westminster, MD, USA
J
J. Charles Smith Offline OP
BritBike Forum member
J. Charles Smith  Offline OP
BritBike Forum member
J
Joined: Jul 2006
Posts: 1,106
Westminster, MD, USA

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Re: Any diff between a Weslake and a Noursh-Weslake? [Re: J. Charles Smith] #367972
04/13/11 8:50 am
04/13/11 8:50 am
Joined: Aug 2001
Posts: 1,081
Cheshire UK
Phatt Bob Offline
BritBike Forum member
Phatt Bob  Offline
BritBike Forum member
Joined: Aug 2001
Posts: 1,081
Cheshire UK
Hi Charles, the short answer is no, not really.

There is a longer answer tho, which involves history.

Back in the dim and distant, the famous Rickman brothers asked Harry Weslake's comany to devise an 8 valve head for their Triumphs. This was duly allocated the project code WRP103 (Weslake Racing Project I guess). The patterns for the heads were built and assembled from wooden blocks. If you get hold of an early Rickman/Weslake head marked WRP103, this is obvious from the final casting. This was the late 60's early 70's. I had one of these on an 850 Triton and although the internal machining was high spec, the outside was a bit prototype-ish.

When the project was dropped, Dave Nourish took on the patterns and developed/evolved the head under the name "Nourish Racing Engines - NRE. They became a lot better finished with the casting imperfections filled and smoothed out, and are available in either big or regular valve heads (big valves are 1mm larger in diameter).

During the life of the heads there were also a number of rocker boxes fitted.
The original Rickman ones made of magnesium alloy weighing about 9 oz, marked "RICKMAN". Quite rare.
The Weslake ones made of magnesium alloy weighing about 9 oz, marked "WESLAKE" Extremely rare.
The new Nourish ones, either plain or marked "NOURISH" weighing about 1lb, made in plain aluminium. Still available new from NRE.

Dave Nourish has the records of the head serial numbers and can date most heads.

There are also a number of barrels available,
The original 680 conversion in alloy.
The newer versions in iron up to about 920cc
PUMA barrels made by Pete Davies which have HUUUUGE fins.

Finally there is the Triumph TSS. A lot prettier barrel and head, but I think only the rocker covers are interchangeable with the Nourish/Weslake parts, I may be wrong.

The head I currently race is N525 which Dave puts at late 70's on the cusp of the change from Weslake to Nourish.

So in a nutshell...
Rickman late 60's to mid 70s
Nourish Weslake late 70's to 90's
Nourish 90's to present date and still going.

HTH

Regards

Bob


Phatt Bob
'95 Daytona 1200
'98 Daytona 1200 dragbike
ex-850 T140 Caff Racer, 850 Triton, Morgo T120, Starfire and Pretend Daytona 500 owner
Re: Any diff between a Weslake and a Noursh-Weslake? [Re: J. Charles Smith] #368023
04/13/11 2:49 pm
04/13/11 2:49 pm
Joined: Jul 2006
Posts: 1,106
Westminster, MD, USA
J
J. Charles Smith Offline OP
BritBike Forum member
J. Charles Smith  Offline OP
BritBike Forum member
J
Joined: Jul 2006
Posts: 1,106
Westminster, MD, USA
Thank you for that very authoritative reply, Bob. The question originally came up on a Facebook group at http://www.facebook.com/home.php?sk=group_156104537765938&id=192670844109307. I posted a link to your reply there. Some of the folks on the forum - basically flat track enthusiasts - had apparently never seen one of those engines before.


Moderated by  Allan Gill 


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