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Norton Single's Performance

Norton Models (not Commando or P11)

Norton Single's Performance

Postby NoiseyNorton » Fri Jun 24, 2016 11:12 am

Looking to find some people who are knowledgeable of Norton singles and are or have done performance to them. Looking to go a different direction from my original twin build idea. Shoot me a PM preferred or respond here if anyone knows of someone.
1970 Commando 750 S
1952 500t w/ sidecar
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Re: Norton Single's Performance

Postby Rohan » Fri Jun 24, 2016 4:12 pm

Mike Pemberton & Pushrod Performance is the man most often mentioned in this regard.
http://www.pushrod-performance.co.uk/
Can't say I've used him, but plenty of reports of him out there.

Someone sorta local to me raced a hot rodded ES2, they had taken it to the max and it used
to keep the good manxs honest. Not sure if it is still around though.
Not sure if you'd want to go that far with a road bike either, it began with fitting steel flywheels,
and went from there.

Tell us how it goes...

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Re: Norton Single's Performance

Postby NoiseyNorton » Fri Jun 24, 2016 5:34 pm

Thanks Rohan. I actually already sent him an email. Was wondering if others were out there but it looks like he may be my only option. And this is more of a fun play bike so I want almost not streetable.
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Re: Norton Single's Performance

Postby Rohan » Fri Jun 24, 2016 5:47 pm

This view under the bonnet of the ES3, as it was called, gives a view of the rewelded downdraft inlet and carby.
Along with the steel flywheels and short stroked engine, and twin sparked, and megga hot cams, this thing was as fast as a good manx ..

http://www.mcnews.com.au/wp-content/gal ... on_es3.jpg

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Re: Norton Single's Performance

Postby Fast Eddie » Sun Jun 26, 2016 4:59 am

I always thought the old 'rule of thumb' for making a pushrod single featherbed Norton go faster was...

Fit a Triumph twin engine !!
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Re: Norton Single's Performance

Postby cjandme » Wed Jun 29, 2016 8:11 am

Fast Eddie wrote:I always thought the old 'rule of thumb' for making a pushrod single featherbed Norton go faster was...

Fit a Triumph twin engine !!

Nasty, just nasty Nigel. :D
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Re: Norton Single's Performance

Postby ashman » Wed Jun 29, 2016 3:29 pm

Fast Eddie wrote:I always thought the old 'rule of thumb' for making a pushrod single featherbed Norton go faster was...

Fit a Triumph twin engine !!


Then it wouldn't be a Norton.

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Re: Norton Single's Performance

Postby J. M. Leadbeater » Thu Jun 30, 2016 3:17 pm

As Geoff Monty said to me decades ago as he explained to me the merits of Norton and Triumph twin motors ......The great advantage to Triumphs is the easy availability of go faster parts but the limiting factor is the combustion chamber design. With the Norton there are very few available go faster over the counter parts but with a bit of effort better performance can be obtained because they are not limited by the combustion chamber design.
We were talking about the old Triumph head.....did not Mr Hele change them to something that bought them into the 20th century when he followed Mr Hopwood to Triumph?
As for making Norton singles go fastER if less reliably with that crowded roller big end......rediculously heavy cam followers ....rockers that weigh tons.....valves of such rediculous size......the cast flywheels.... Some of us played with them to amuse ourselves many decades ago i our youth long before we learnt that doing so reduced their reliability....... BSA B44 high comp piston ...E3134 cam form.....Mod 50 head modified as per the 500T ...... but such lumps are no longer a Norton..... Norton 350/500 singles were designed to plonk around all day at 40-60 mph vibrating happily to themselves as they poodle around the back roads of the UK.....not for coming back from the IOM flat out down the M6 / M1 as my poor old ES2 did on the odd occasion.....and amazingly staying together in one lump. Actually a few months ago I handed it over to a friend (EX Pres. of the Triumph Owners Club??) who has poromised to fully restore it and never sell it. I really must cobble together the 3 friction plate diaphragm spring clu tch belt system for it...t. If I dont die first he is even going to pay for it but if I go first its his for free! Riding it should make a change to his two modern Triumphs...

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Re: Norton Single's Performance

Postby Bernhard » Tue Jul 05, 2016 6:23 am

It is well know that Mr Hele was employed before he moved to Triumph, at Norton’s Birmingham Bracebridge Street factory until 1962 in which he developed the 500 Domiracer , the lighten bucket cam followers he developed for that with eccentric rockers adjusters gave the engine an ability to rev to 10,000 rpm :!:

This is NOT the original 500 Domiracer;

http://clubmanclassics.blogspot.co.uk/2 ... racer.html

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Re: Norton Single's Performance

Postby acotrel » Thu Jul 28, 2016 3:01 pm

The way to make a Featherbed Norton go faster is to fit a Jawa Speedway motor into it. You need a return pump for the oil, and a new piston if you want to use petrol as fuel. If you look on Ebay in Europe you should be able to find a cheap motor fairly easily for less than $1000, or you can buy a new one for about $5000 from the factory. The advantage is they are a RACING MOTOR, not some jigged-up road motor.
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Re: Norton Single's Performance

Postby acotrel » Thu Jul 28, 2016 3:05 pm

Faster than a speeding Manx Norton :

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Re: Norton Single's Performance

Postby acotrel » Thu Jul 28, 2016 3:08 pm

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Re: Norton Single's Performance

Postby Rohan » Thu Jul 28, 2016 3:24 pm

acotrel wrote: The advantage is they are a RACING MOTOR, not some jigged-up road motor.


So you need to rebuild them on Monday after a Sunday ride ??!

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Re: Norton Single's Performance

Postby J. M. Leadbeater » Fri Jul 29, 2016 4:03 am

You would be amazed at the usaes for Jawa flywheels and con rods which are /were a few years ago anyway available individually and at very reasonable prices.

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Re: Norton Single's Performance

Postby acotrel » Fri Jul 29, 2016 3:37 pm

Jawa speedway motors usually do a full season of racing without a rebuild. In fact many of the old Brit singles in Australian historic racing have Jawa internals. If you try to get an ES2 going, one of the weak points is the crank pin. And in any case where do you start and finish with an old Brit single motor ? After you done all your good work and spent your money, the Jawa engine would have been cheaper and better.
I gave this advice to one of our better historic racers, when he and his father were playing with 500cc Matchless singles. He fitted an unmodified two-valve Jawa engine into his featherbed and immediately beat the best guy who was riding a new Molnar Manx from Ken McIntosh in New Zealand.
A Jawa engine with low-comp piston and in a Featherbed frame would last forever when used on public roads. And it would be bloody fast.
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