Rotary Owners' Club

Hi John,I think Bob Rowley personally road tested every one of the Classics, covering somewhere between 10 and 20 miles.It is quite possible that a slave speedo was used on this bike and a new, zero miles, one fitted at the buyer's request after the bike had been passed off. Yes, every classic also...

This post reminded me about the test at Girling Track , Tony Dennis is holding the bike, the two Guys on our Left are I believe TRLL men, and not happy when I could not clear the anti lock brakes, my stopping distance actually increased even on the very low mu surface, when compared to having normal...

Yes, stainless is an absolute must. I remember circa 1968 ( BSA) running a steel exhaust with brazed joints, and if it was not for the school bus holding me up at the factory gate, I may have got a few hundred yards on mileage prior to the exhaust falling off completely.And to my shame will always ...

Nortonash wrote:Tank is sold, thank you.

Tanks for the memory

Wayne,Can you send a Photo?The words could be sv, cc .Did you say that 3500 is on the plate, this could be the RPM for the static noise test? we conducted noise test at Cadwell park, as we was trying to correlate the engine RPM to the sliding apex seal speed / conventional piston engine sliding spee...

Wayne,The swept volume was worked out as follows 3*Sqrt 3 * R * e * WR , e & W is found by the scrutineer measuring the major axis and the minor axis and the housing width. Sqrt 3 = 1.73205 3 * 1.73205 = 5.19615 constant true for all Epitrochoidal Rotary Engines.Major Axis say 16.62 cm & Min...

Sorry, should say corner bolt spring. these did break and parts escaped, when you rebuild ensure that the corner bolt flat base hole in the rotor is sufficient to allow the corner bolt ( seal) to travel below the rotor side face. Bob

The clue could be in the last remaining part of the seal, look at the ends of the spring under a say a 10x loupe and see if the end/s are chamfered, I have seen seal's worn down but never totally disappear.And I take it that the springs are not baked flat to the underside of the apex seal?Bob

Candy Apple Red, Dream Machine was one of the Factory Approved Painters.

Sorry John,Shucks and I thought that I had all the log books? I have not read them for years, the saying goes "it's all in the book".Bob

John,Good news,If you ever need to read the Wust log book file let me know.Bob

John,Clutching at straws.If you are on the centre stand in first at say 1000 rpm, when you clutch in and brake (rear) when you let the brake off does the wheel start to spin up again, most did this to a greater or less degree, if it is really powerfull with clutch lifted fully then I would suspect a...

WayneOf course I spotted the 24 year old typing error, just as I hit the submit button, Lets say that the average that a road machine will be 45mph then 70000/45 = 1555.6 not 15555.6 Hours of which 30% is at peak power 467 Hours say & 1089 say at cruise loadBob

Wayne,I found this for the 5 speed, I would have done a similar one for the 6 speed.BobUtilization RatioPower Race Motorcycle 100%Road Going Machine 30% of Peak Power 70% for cruiseExpected Life Miles Race Road3000 70000Gear 1st 2nd 3rd 4th 5th Life to failureRace 2% 15% 34% 33% 16% Bending L50 Pitt...

Wayne,All NRS boxes machined and raced from castings not cut and shut, the sample that the pattern maker followed was a cut and screwed together cut road bike casting. The Drive end plate was cut and welded on, the gearbox sandwich plate being machined from solid The design brief set was 24 hour lif...

BTWThe gear in the picture that Richard posted, is 2 nd generation, made by Staff's Silent Gear Co, if you look closely you will see the Lightening slots to reduce inertia and speed up the gear changes.Bob

Hi,I did not know the wide centre was in the public domain!.The NRS Wide Centre gearbox did not have the same ratio's as the standard, a closer ratio I will look out for the Data sheets. (in the loft)My part in all this apart from running the Inspection Department, helping to manufacture 7 different...

Hi John,Do you want me to look in the Wust file as I still have the mileage log book?Bob

Hi,We was conducting high speed stability test, and had a machine set up that developed self start weave, this was in part due to a small radio case being placed on the rear behind the Pillion seat, from memory the weave self started at 90 mph but never went critical up to a maximum sat up unfaired ...

Hi,Check if the use of Radial and Crossply tyre is road legal a I did not think that it it was 25 odd years ago.Bob

This thread seems to be about clutch drag, so this is what my post is about.The clutch drag can be tested without the engine running, put machine on it's centre stand rear wheel off the ground place say a 5 kg weight onto the rear tyre so the wheel tries to reverse, then try to disengage bottom gear...

Not all Norton’s did this, it was part of our pass off test to check the Head Shake, to see if it would self start, if it did not we would thump the handlebar to get it started and see if it self stopped, at MIRA we would hands off at 100 mph and study when the shake started, some at around 70 mph d...

Norton rotors only had serial numbers for identification, and the early ones didn't even have that, and many have been modified along the way !There are really only three (?) different types of side faces :. completely flat side faces, early rotors. mainly flat faces with slight (.005") lower a...

I did attache a spreadsheet that you could use, this also give an as yet unproven Compression Ratio for the Rotary engine, the swept volume being well proven.BobI will try to add the file call COMP.XLS again on this post.I see that the extension XLS is not allowed so I have ZIPPED the file to see if...

The stroke volume is given by the difference between the maximum and minimum values of the volume of the working chamber,The volume of the working chamber can be approximately calculated in practically sufficient accuracy by taking R1 = R+aR1= 71.5 mm ( R= 69 mm + a=2.5 mm ) : e= 11.6 mm ( shaft thr...