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Valve angle

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Sadly, due to moving, etc, all my books are packed away.

Does anyone have the valve angle figure, please?

Our (Lightweights...) valve angle is unusually narrow (compared to other engines), due to the original plan of Bert Hopwoods to have a one-piece head & barrel design, aircraft engine style. The valve angle had to be narrow, to allow for insertion from below.

Thnx

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Andy....try this link.

https://www.nortonownersclub.org/history/lightweight

Looks like the answer to your question is in the engine section.

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... I thought I would  help Andy out and searched our records during a spare hour but couldn't  find that.  Well done Phil.

So it is 42 degrees Included angle. to save you all looking...

 

Jon

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Thanks Phil - what you mean is, that I knew it all along..............

Turns out the chap was looking for the angle of the spark plug anyway, to calculate piston height by Pythagoras - to aid in timing his beastie...

I've written to him about the piston stopper method, as outlined in the Norton Twins Manual........

Thanks all

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Andy.....I am sure that lesser respectful people would have got some mileage out of this.

Like Jonathan, I checked a few other sources first and then tackled the Search Box above. Perhaps the NOC needs to promote this facility better as there is a huge quantity of useful information hidden away within it. I am certain that a lot of questions asked on this Forum could be self-answered with just a few more mouse / button clicks.

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A tour along the top bar reveals a huge amount of good information. Your reply without revealing the answer had me curious. I learnt quite a lot about the depth of Information we hold on this site. Maybe a few pointers from the webmaster to encourage members to search within our own history before someone creates another “oil” thread…

cheers

Jon

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Jonathan.....you have to be very careful when offering facts and figures to others on the Forums these days.  Unless the numbers are backed up by the likes of an engineering drawing then who is to say they are correct?

I have never owned or know anything significant about the Lighweight range of Nortons. In which case it is safer to guide owners to reliable sources of information and then let them make their own decision as to its content and accuracy.  All of the big name source books for my Nortons contain gaps and errors. This includes even the Norton service and maintenance manuals.

 



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