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Norton mod 18

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hello i have a mod 18 engine, i don't have a crankshaft, finally i found one, i found one the connecting rod is 4099 and the crankshaft number is 263s i don't know if it fits  to this engine?, anyone have the crankshaft numbers?  my engine number: 59863. 79x100.  Thanks maurice

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Hi Maurice,

   I had a look at a pair of pre-war 16H flywheels today that have been dismantled and both of them had the casting number 0262. Your 263 flywheels might be for a 600cc Big4 or Model 19. The casting should be the same on the 16H, Model 18 and ES2. 

   The best method to check this is to measure the stroke. If you use a steel ruler and hold it on the mainshaft, the measurement to the centre of the big-end crankpin should be 37.3mm. If it measures 43.8mm it is a 600cc type. The con-rod length should be cast on the middle of the rod and should be 7" (177.8mm) between the centres of the big and small end holes. If you can attach some photos it might be possible to identify them.

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Hi Maurice,

   I found another pair of flywheels today which I think came from a pre-war ES2 or 18 and they have the number 10262 on each wheel. This could be a newer casting to the one I posted earlier.

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Isn't it the case that the 16H had cast-iron flywheels ? The stroke is the same, but 16H rods are longer. I have a boxed NOS 16H rod marked E4101.

Probably not a good idea to use 16H flywheels in an engine capable of revving.

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Hi Maurice/Richard,

  16H, Model 18 and ES2 used maleable (heat treated) cast-iron flywheels. This a poor material for flywheels, but flying in the face of reality, I used them in my Model 18 vintage racer running on methanol with a 11 to 1 compression ratio. This ran very well with a top speed of 105mph and won a few races in it's class. This came to a stop when I accidentally opened the throttle at low speed in third gear and the crank-pin sheared clean through and stretched the holes in the wheels and rendered them useless.

..as usual.

Thanks for the clarification, Richard. Was it only the OHC that had steel flywheels ?

As a 16H chap, I'm at low risk as the thing simply runs out of chuff...I'd guess somewhere around 4750 rpm. Five at a pinch.

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Hi Richard,

   All the Carrol OHC engines used steel flywheels, but also the 350 Model 50 and 55 used steel flywheels. I think this was because the holes in the flywheels are closer together due to the shorter stroke making cast wheels liable to fail. My racing engine ran to 6,000rpm, but this was for relatively short periods and I think the big-end would fail at these revs with prolonged running.

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hello excuse me not had a lot of time here are the photos of my engine and the crankshaft the 16 o'clock pinion does not coincide too big?  the crankcase is badly repaired when do you think?, finally I look every day to find one, and then I live in Belgium, thank you again for this precious information, I know that for this engine you need a connecting rod number 4099, and precisely  buy this crankshaft but I don't think this model is for my engine, thank you Maurice

hello excuse me not had a lot of time here are the photos of my engine and the crankshaft the 16 o'clock pinion does not coincide too big?  the crankcase is badly repaired when do you think?, finally I look every day to find one, and then I live in Belgium, thank you again for this precious information, I know that for this engine you need a connecting rod number 4099, and precisely  buy this crankshaft but I don't think this model is for my engine, thank you MauriceMod 18

hello excuse me not had a lot of time here are the photos of my engine and the crankshaft the 16 o'clock pinion does not coincide too big?  the crankcase is badly repaired when do you think?, finally I look every day to find one, and then I live in Belgium, thank you again for this precious information, I know that for this engine you need a connecting rod number 4099, and precisely  buy this crankshaft but I don't think this model is for my engine, thank you Maurice

hello excuse me not had a lot of time here are the photos of my engine and the crankshaft the 16 o'clock pinion does not coincide too big?  the crankcase is badly repaired when do you think?, finally I look every day to find one, and then I live in Belgium, thank you again for this precious information, I know that for this engine you need a connecting rod number 4099, and precisely  buy this crankshaft but I don't think this model is for my engine, thank you Maurice

hello richard, I send you my email address, because I have problems to send the photos, thank you maurice.paulis@gmail.com

hello richard, I send you my email address, because I have problems to send the photos, thank you maurice.paulis@gmail.com

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Hi Maurice,

   I will send you my email, but you can also contact me through this forum by clicking on my name which sends the message to me only. 

   Looking at your photo of the measurement, I see it is 48mm which makes the stroke length 96mm. The most likely bike these flywheels are from would be Matchless or AJS and could be 350cc or 500cc as they both used the 96mm stroke. Motorcycle manufacturers would buy the castings from an independant metal forging company who might supply many different factories, and this is why the casting numbers are very similar to each other. You will need to look for the correct Norton flywheels, which might be difficult, but they often come on ebay (UK). You could also put a wanted advert on this site. Looking at the photo of your crankcase, I think your engine is 1934 or 5, but these flywheel assemblies were used from 1934 to '37 and also for the military 16H machines made for the armed forces. If you find a set, post some general photos of the whole assembly and I will try to identify them for you.

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Hi Maurice,

   If you could send your engine number, I could give you a more accurate date for your engine.

 


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