I have an old bolt up dommie frame.
Could I fit an ES2 engine and laydown gearbox in it without any frame mods?
If so, could I just use engine/gearbox plates as used briefly on later wideline/slimline singles?
No Keith is the answer. you don't want to read. The front engine plate mounting lugs are different and there is a flattened part of the top right-hand tube to allow clearance of the rocker box. Far better to do a swap with someone with a wideline single frame. They are rarer than the Dommie frame however. Good luck, Howard
Thanks Howard, that is what I feared.
How to be a twin engine then.
Hello well if you have a 1952 to 1954 Model 88 frame then the way of fitting a big single in there is one you need to take all the paint of then with some help heat up the right-hand top tube and with a nice piece of thick flat bar with now glowing hot put the flat bar on the inside os the top tube and nip it up with a number of G clamps you only need about a good Half inch flat , then try sitting the engine in place and with some cardboard make some cut-outs for the engine plates out of 8mm alloy its best to have cut by laser or high presser water cutting once you have this done it just a case of getting some nice stainless studs and nuts and washers and fixing the engine in place or finding some Featherbed engine plate for a Singel, happy engineering Yours Anna J
If you have a pre featherbed engine, you might have to make engine plates to mount the mag-dyno.
It sounds like I might need lots of help.
I have been advised to look for a late one.
The frame rail was left alone for this project.
I think there is a tad more clearance on the bolt up frames for the tappet adjustment, but you will have to modify the engine plates to fit a magdyno. The picture shows a Model19 in bolt up frame but that needed the bottom of the tank modified to give clearance for the rocker box and a modified head steady.
A very tidy piece of engineering.......well done!!!
My current project has similar issues with fitting all the important chunks snugly inside a frame. My worry being.......does the mag/dyno not get cooked on long journeys???
See attachment please.
Apart from fuel stops I once did 700 miles non stop in an Australian Summer on an ES2 with a magdyno and had no trouble at all. Other long distance rides were also undertaken with no trouble. She'll be right as we say in Oz.
Norton fitted a 1948 pattern 16H engine experimentally into a bolt-up Featherbed There may be some clues in the way that they did it.
I have not had any problems as yet. Probably due to the exterior of the engine being oil cooled. After around 10 miles of riding the vertically split valve covers, rocker posts and pushrod tunnels all drip enough oil over all the exterior chunks and help to keep them cool.
The longest ride accomplished was a 38 miles stint while carrying the Eric Cox Trophy along the south coast from Gosport via Portsmouth to Hayling island.
i don,t think you will have much of a problem,if your frame is a bolt up the frame tubes are wider than a slimline,i have a slimline es2 1963,and the rockerbox is 15mm clear of the frame,as someone else has pointed out the inside of a single frame is flat,and as anna said you could easy do that,but a early boltup frame may be wide enough,my slimline is 8.5 ins inside. check what your frame measures i think you will have to make engine plates,and mount the mag/dyno on a plate, my other single have a mag/dyno behind the head and don,t get cooked,
Perhaps an alternator engine would be favorite, if I can find one.
Original Norton frames are so hard to find these days that I now consider it a bit unnecessary to alter them at all ....why not find an engine/gearbox combination that fits your frame that might 'only' need some bespoke engine plates being made?
I have a 'cafe racer' Domi 99 that was once a 'Delux' but never have I felt I should grind off the original panel fitting lugs on the frame. It's much better in its factory form I feel. Maybe in the future someone rebuilds it as a Delux (not me!).