sturmey archer 3 speed --how does it handle power

kinsler33

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#11
The only failure of an SA three speed I ever experienced was when the central (or 'sun') gear broke, presumably because the rivet that pins it to the axle was loose and finally wore out. So when you tear down the hub for inspection (and you should) this is one area you'll want to check.

Mark Kinsler
 


Herman Klutz

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#12
I like cannonball2 idea with that. I ordered one of those carbs after reading through the thread. Waiting on delivery to figure out how I will fit it.
He gave enough info in the thread to make a manifold to get it connected and a how to on the air cleaner that was made from a pellet container. Another option that I believe will work is to sand cast his version and make a one piece manifold out of pewter.
 

kinsler33

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#13
Pewter. That's interesting. I don't know how strong that stuff actually is.

If you're restricted to low-temperature casting, it might be helpful to visit your nearest high-quality metal scrap yard and see if they have any zinc die-casting alloy. These guys know metals rather well and can likely give you hints on melting temperatures and such. Most die-casting today is done with aluminum, but that requires a crucible that can withstand a fairly violent furnace.

Having said that, I can attest that it's fun to melt aluminum: dig a 12" hole in the ground, bury a pipe so that it slants down into the bottom of that hole, fill the hole with charcoal from the grocery store, dump in some crumpled newspaper and maybe charcoal lighter, add a match, wait a few minutes for the charcoal to catch, and then apply an old hair dryer to the pipe (you can attach it to the pipe with duct tape for an added touch of elegance.)

When the air from the hair dryer (set it on 'cold') reaches the smoldering charcoal interesting things start to happen: red flames issue from the ground, and the roar of the fire will keep the neighbors from ever bothering you again. Smoke issues from cracks in the soil near the hole.

Do not use the family barbecue grill for this sort of thing, for it will essentially burn up.

The crucible can be a piece of iron pipe closed at one end: feed it crushed aluminum cans and other aluminum scrap. Molten aluminum doesn't glow brightly, so caution is advised. Borrow a tablet of swimming-pool chlorine and dump it into the melt to purge dissolved gases and thus eliminate bubbles, and pour your casting.

You will never look at an aluminum shower stall or screen door the same way again.

M Kinsler
 

LewieBike

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#14
I like cannonball2 idea with that. I ordered one of those carbs after reading through the thread. Waiting on delivery to figure out how I will fit it.
A lot of additional fabrication to make the pumper carb fit. The interface between the carb face and the clamp on spigot, will be a challenge I found with my PW50 carb adaption that my aircleaner space was tiny
 

LewieBike

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#15
The only failure of an SA three speed I ever experienced was when the central (or 'sun') gear broke, presumably because the rivet that pins it to the axle was loose and finally wore out. So when you tear down the hub for inspection (and you should) this is one area you'll want to check.

Mark Kinsler
The 3 speed hub they're referring to is a new design and has a much different axle than the old AW3 hub, especially the old AW's which have that rivet.
 

kinsler33

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#16
"The 3 speed hub they're referring to is a new design and has a much different axle than the old AW3 hub, especially the old AW's which have that rivet. "

Ah. That one was likely from 1970. The one I took off my Schwinn was actually a German copy from the early 1950's. I rebuilt the wheel with 14 gauge spokes and a coaster brake. Even with a 49cc engine on it, that overweight Schwinn and its overweight rider can go a lot faster than you really want to go on a bicycle, at least when you're as old as I am.

Mark Kinsler
 
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#17
"The 3 speed hub they're referring to is a new design and has a much different axle than the old AW3 hub, especially the old AW's which have that rivet. "

Ah. That one was likely from 1970. The one I took off my Schwinn was actually a German copy from the early 1950's. I rebuilt the wheel with 14 gauge spokes and a coaster brake. Even with a 49cc engine on it, that overweight Schwinn and its overweight rider can go a lot faster than you really want to go on a bicycle, at least when you're as old as I am.

Mark Kinsler
No It's actually from about 2012, it's a completely new design that owes nothing to the old AW3, which runs it's sun, ring and planet gears as under, direct and over driven. IIRC the new Sturmey Archers are direct drive from first gear and over driven by split suns with stepped planet gears. Supposedly stronger construction, less chance of slipping and gets rid of that false neutral between 2nd and 3rd.
 
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