1971 Single sided swingarm fastback (2011)

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soturi said:
very interested in this project - you're doing some cool stuff, motoalchemist. definitely interested to know how she ends up riding when complete.

a question, though, regarding hobot's 17" comments: aren't the stock wheels on our bikes 19"? i realize the tires are meatier for the 17" wheels, but shouldn't the lower rotational inertia offset that at least a little? i always thought reducing the radius of rotation had a more significant effect than changing the mass that's rotating.

perhaps?
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For some reason my earlier response did post...so Im trying again.

In the begining... The Idea behind the suspension with the 17" wheels was being able to buy modern sticky rubber(for racing). The total weight of the 17" wheel and tires is much less than the 19" tire and wheel assemblies. So this presumably would warrant faster acceleration...less rotating mass to spin up. Your quote;
"i always thought reducing the radius of rotation had a more significant effect than changing the mass that's rotating."
Honestly, I dont know if that reduction of radius has more profound effect than actual rotating mass (regardless of radius). I have mentioned before that the whole 17" wheels package may be a bit gimmicky, or may turn out to be amazing. wont really know until its maiden flight.
I know the whole bike will have a lower center of gravity as it will essentially be 1.0" lower to the ground. I will also have to experiment with gearing ratios. I will still want to have the bike at 2500 RPM at 65 MPH..or so.
 
Ewww motorchemist you perked my interest with the torque monster low rpm flyer. I too seek that for a number of reasons. I've so tried to get the most turing G's loads out of 17" race rubber and about crash trying to match my skinny tires which then can exceed any fat tire edge grip. Don't completely build yourself out of narrower rim option in future. Low ain't so good for far over leans so be careful with such a power plant.
 
hobot said:
Ewww motorchemist you perked my interest with the torque monster low rpm flyer. I too seek that for a number of reasons. I've so tried to get the most turing G's loads out of 17" race rubber and about crash trying to match my skinny tires which then can exceed any fat tire edge grip. Don't completely build yourself out of narrower rim option in future. Low ain't so good for far over leans so be careful with such a power plant.
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Yes, I understand... alot has been learned since this project started...but this bike is beyond going back to stock....luckly I have my Interback to have a baseline to go by. Worst case ...The bike could be parted out.

previously I meant to say 3500 RPM at 65 MPH (not 2500RPM)
 
Ok 3500>65 mph ain't uncommon in not hot rod Cdo's, IIRC 21T sprocket will give that.
I ride THE Gravel so live in loose states imprinting bike behavior about to loose it routinely. I paid $4000 + $1000 for '00 SV650 with better suspension and shod with non DOT 17" race tires. Got right right up to its tires getting loose in pulbic so paid $3000 for corner school and tried to crash it by over powering on full leans sharp as I could - woohoo! I almost sold out of Norton but like you committed to finish the restoring with advise of others to modify as as known then. Got Ms Peel broken in and then let her hair out to find such secure comfort at my prior known limits of cycles/tires, so really torn her hair out and couldn't believe the handling. Then hoped on SV and about crashed on turns and braking, just to match Ms Peel go to work and back commuting rates. Many times over some years. I have lost respect for fat ass tires once leaned 45'. Beware your self creeping up on your beastie.
 
Good looking custom bike yor building motoalchemist !! truly one of a kind. I'm a little curious about your front end as I have the front end off of a Honda 1000 hurricane from a few years back that I was always going to mate up to my '69 basket case. Now that I have a '75 MKIII i'm focusing on it instead of the basket case, and will keep the stock front end my '75 (probably go with a lansdown kit though & drilled rotor w/sleeved master cylinder). However,I've always wondered why Norton used 19 inch rims? Was it a hold over from the early years? 19 inch tires more readily avialable then? Was it function handling/steering goemetry etc...?

by soturi » Tue May 03, 2011 8:56 pm
a question, though, regarding hobot's 17" comments: aren't the stock wheels on our bikes 19"?

Thoughts anyone? Cj
 
Like 17" tires today. 19" tires was the norm for street bikes...almost all off my old yamahas and honda CBs had 19" front wheels....19" fronts are still very popular...its the 19" rear on the Norton thats becoming difficult to source.
 
I'm finally finished enough other projects to get serious again completing my other Norton.
Fist step is to finalize the exhaust system....I have a nice 2 into 1 system, but like the look of dual exhaust. I have some shortened commando headers ( thanks rathead ) running into clearance issues with mufflers and headsets, may just stick with 2 into 1 to avoid another big welding bill.

1971 Single sided swingarm fastback (2011)


1971 Single sided swingarm fastback (2011)


Here's a good view of the engine from above....you can see how the whole assembly is moved to left...so chain can get around rear tire

1971 Single sided swingarm fastback (2011)
 
finally begun teardown for paint polish and such

1971 Single sided swingarm fastback (2011)



here is a close-up of the modified gearbox cradle.

1971 Single sided swingarm fastback (2011)




the basic parts, frame is already gone to powdercoating, building motor now

1971 Single sided swingarm fastback (2011)




the engine has been hollow this whole time during mock-up.....going to do the buildup over holiday weekend

1971 Single sided swingarm fastback (2011)




the swing arm, exhaust, battery tray, and oil tank. im going to wrap the exhaust

1971 Single sided swingarm fastback (2011)
 
thanks for taking the time to take the photo's to share with the rest of us. Cj
 
Your welcome cjandme, I intend to share the entire build up with all of you. And hopefully share some upcoming issues with AC in hope to get ideas from forum members for creative solutions.
 
last night i assembled the crank.....Norton crankshafts are so beautiful, its ashame you never will see it again

1971 Single sided swingarm fastback (2011)



1971 Single sided swingarm fastback (2011)




And i must make a correction, earlier i said my cylinders were maney, but they appear to be dunstall, lol. they look the same

1971 Single sided swingarm fastback (2011)
 
Oh boy, those cylinders will bring pages of controversy. Get ready. Any time I mention anything dunstall, they come out of the woodwork.
 
Nice to see a polished crank and big end caps. Looks like your rods are polished as well, was it all balanced? I see you have 850 cases, is that an 850 crank as well?
 
RennieK said:
Nice to see a polished crank and big end caps. Looks like your rods are polished as well, was it all balanced? I see you have 850 cases, is that an 850 crank as well?
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No, the crank is 750, and yes crank is balanced and I did spend some time polishing
 
RennieK said:
Nice to see a polished crank and big end caps. Looks like your rods are polished as well, was it all balanced? I see you have 850 cases, is that an 850 crank as well?
Click to expand...

No, the crank is 750, and yes crank is balanced and I did spend some time polishing.
 
bwolfie said:
Oh boy, those cylinders will bring pages of controversy. Get ready. Any time I mention anything dunstall, they come out of the woodwork.
Click to expand...

Really? Well thanks for the warning, when I acquired these cylinders years ago, the name dunstall didn't mean anything to me yet
 
Excellent thread, M.A. -thanks for sharing, even if you draw flak, like the chopper boys do..Go for it.
 
J.A.W. said:
Exellent thread, M.A. -thanks for sharing, even if you draw flak, like the chopper boys do..Go for it.
Click to expand...

Thanks J.A.W. i will...Im too excited about this decade old project finally/seemingly in its home strech
 
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