Mainshaft 1 ST Geaar 16T !!!!!!
- Thread starter pierodn
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Hi Piero,
What you have there is a Quaife gear. I recognise the numbering system.
It's definitely for a close ratio racing gearbox without kickstart facility (layshaft gear 26 T).
Bert
What you have there is a Quaife gear. I recognise the numbering system.
It's definitely for a close ratio racing gearbox without kickstart facility (layshaft gear 26 T).
Bert
Hello Piero
just for something different, a 13 tooth option may replace the Norton standard ist gear 14 tooth pinion. it all depends on what access u have to engineering gear and how many mates u have that may help. it has to be made but is not that difficult, the biggest hurdle is access to workshop and heat treatment gear.
the 13T pinion fits straight in with no modifications, can be used with a standard second hand 28 T gear, but a new 28T gear is recommended,
the 13 tooth pinion is far superior regarding strength and has far less tendency to pit and score. the standard 14T pinion has not been modified, and shows severe undercutting. I reckon the ratio change would give a touch more off the line for those who like harsh acceleration.
if you like PM me for more information.
Bradley
just for something different, a 13 tooth option may replace the Norton standard ist gear 14 tooth pinion. it all depends on what access u have to engineering gear and how many mates u have that may help. it has to be made but is not that difficult, the biggest hurdle is access to workshop and heat treatment gear.
the 13T pinion fits straight in with no modifications, can be used with a standard second hand 28 T gear, but a new 28T gear is recommended,
the 13 tooth pinion is far superior regarding strength and has far less tendency to pit and score. the standard 14T pinion has not been modified, and shows severe undercutting. I reckon the ratio change would give a touch more off the line for those who like harsh acceleration.
if you like PM me for more information.
Bradley
lcrken
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The gear is from the older Quaife A1H gearset, which had two or three first gear pairs as options. Yours is from the close ratio racing set, with no provision for a kick starter. The matching Quaife layshaft gear has 26 teeth, for a first gear ratio of 1.986. There were also a couple other lower ratio pairs available back in the day for road use, and at least one of them allowed use of the kick starter.
Ken
Ken
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I have to say I am astonished and amazed at the level of knowledge which is shared among this group. I only wish I had the ability to glance at a random gear and tell you it is from a forty year old racing gear set AND one of three optional ratios/set ups which were offered.
Thank you for all the help, I am in awe.
Thank you for all the help, I am in awe.
lcrken
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johnm said:
Actually this isn't really "another one", because it's from one of the Quaife 5-speed gearsets, and the ratios you've listed are some of the factory Norton 4-speed gearset ratios available, and the Quaife and Norton gears aren't interchangeable except as complete assemblies.
If you're interested in adding to your list, Norton also produced a 13/29 first gear pair for the AMC 4-speed. The final first gear ratio from any of the first gear pairs depends on which high gear pair is used. In addition to the 23/18 and 23/19 you've listed, Norton also produced them in 23/14 and 24/18. Lots of combinations available just using factory parts. I don't know of any other second or third gear pairs from Norton besides the ones you've listed.
Other 4-speed combinations were available for the AMC case from Quaife, Barton, Five Star, RGM, and probably others I don't know about. Some were interchangeable with standard Norton gear pairs and shafts, and some were not, requiring the complete gearset to be installed.
Ken
johnm
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" Actually this isn't really "another one", because it's from one of the Quaife 5-speed gearsets, and the ratios you've listed are some of the factory Norton 4-speed gearset ratios available, and the Quaife and Norton gears aren't interchangeable except as complete assemblies. "
Of course - Yes you are right.
I had made up the list I gave to investigate options for clubmans class short circuit "sprint " racing here in NZ. Changing the high gear pair was exactly the way I got a slightly close ratio option without going the full racing option.
A typical full Norton close ratio option was no good for our type of racing because 90 % of results were determined by who got to the first corner first. So you really wanted a low first gear for acceleration. Our races only last max 6 laps of a circuit which can be a lot less than 10 minutes. So getting to the front first was the way to win.
Of course - Yes you are right.
I had made up the list I gave to investigate options for clubmans class short circuit "sprint " racing here in NZ. Changing the high gear pair was exactly the way I got a slightly close ratio option without going the full racing option.
A typical full Norton close ratio option was no good for our type of racing because 90 % of results were determined by who got to the first corner first. So you really wanted a low first gear for acceleration. Our races only last max 6 laps of a circuit which can be a lot less than 10 minutes. So getting to the front first was the way to win.
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What might this have been I wonder ?
There were no takers it seems.
http://www.ebay.com.au/itm/281067707933 ... _cvip=true
There were no takers it seems.
http://www.ebay.com.au/itm/281067707933 ... _cvip=true
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Looks like the close ratio set from RGM.
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