the construction kit of Norton allowed them to create models of different capacity while use as many parts as possible. Going through some books it came to my mind the I could convert a 88 slimline model while altering this and that part to a 650 slimline model.
Please note that I do not plan doing so it is more to know that it will work this way.
Going forward from a a 88 model with a 2 carb cylinder head one would need;
As the cylinder head of the 88SS is the same as the 99SS and the 650SS it can stay as it is
The 88 cylinder with 66 mm bore must be changed to an type with an type with 68 mm bore or can a 88 cylinder be bored out to 68 mm?
The 88 crank must be changed to a type with 82 mm stroke for a 99 or with 89 mm stroke for having 650 capacity. Is the crank with 89 mm stroke the same for the 650 and the Atlas model?
I don’t have a good idea about the push rods and the camshaft which parts are identical or different. I only noticed that Andover only has one type of cam for all the Dominator twins.
Thank you in advance for your inputs this will help me to understand the Dominator construction kit more detailed.
I'd suggest you acquire a copy of Bacon's 'Norton Twins Restoration' and also his small format hardback 'Norton Twins'. They should have most of the answers.
Also the Dommie parts list for your year of interest. That will tell you what parts are common to which models.
The problem with both the likes of Bacon and Haynes is they hardly mention important data crucial to a rebuild. For example both show the tables below in one for or another
Dominator Pistons & Barrels
CAPACITY BORE STROKE
497cc 66mm 72.6mm
596cc 68mm 82mm
646cc 68mm 89mm
745cc 73mm 89mm
But neither bother to mention clearly that the 88 barrel is shorter by nearly 10mm than a 99/650 barrel or that an 88 or 99 or 650 barrel will not fit 750 crankcases without bodging.
The 88 barrel can be bored out to take 99 pistons but will get most upset if plonked on top of a 99 crankshaft.
The 650 crankshaft is similar in dimensions to the 750 and Commando crankshafts but the centre web is machined and balanced differently.
Pushrods for post 1960 models are various lengths and types. Type pushrods into the searchbox (top right) to find a table of data about these.
daniel....if you can find somebody who knows all about Norton Dominators then ask them for advice.
Hello now has for early Norton dominator model 88 some engine parts are different, to later models From September 1955-to-1962 model 99 barrels will not fit the 650 as the 650 was moved back some 2mm and the 750 moved back some 5mm and crankcase studs moved back a 1 mm, Now early Norton Manxman 650s had finely balanced centre webs and the early 750 Bracebridge models were balanced to 60% and had concaved low compression pistons 7:9:1, made by BHB part number 24279 RH and 24280 LH, piston parts numbers for 650 are 23269 RH and 23270 LH, these are 8:9:1 compression ratio, please note that it states in the Norton owners Manuel that it is not advisable to Bore the barrels no more than 40 thousands oversize with the models 99 and 650 and 750, And after 40 thousands you must resleeve the barrel at a good competent engineering company yours anna j