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Ironhead Sportster Motorcycle Talk (1957-1985) For all those that wanna talk about Ironhead Sportster Motorcycles

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  #31  
Old 16th September 2018
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ryder rick ryder rick is offline
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Sounds like putting a V8 in a Vega.

OOoooooh, cutting the gearbox off a Vincent might get you drawn and quartered in some circles!
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  #32  
Old 17th September 2018
JustaBastard JustaBastard is offline
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Gimme an Atlas jackhammer that turns the handlebars the size of ball bat big ends at 5000 rpm, any day over a unit construction Triumph twin in a featherbed. You end up with fore and aft motorcycle "trunks" or luggage compartments large enough to carry a few bags of groceries.

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Originally Posted by Ferrous Head View Post
Not the puny little Norton things that originally graced them.
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  #33  
Old 17th September 2018
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Quote:
Originally Posted by Ferrous Head View Post
The Sportster engine is a natural fit into a Featherbed frame. And it makes one of the most (THE most ?) potent combination you can have for a pre 63 motorcycles.
When finished it looks like the frame was made for the engine. Not the puny little Norton things that originally graced them.
One of the last things planned to do to the frame before final assembly was to set it up in the big FADAL and move the swing-arm pivot point after adding inboard gusset plates parallel to the existing plates; since the adjustable timken bearing swingarm would benefit from locating in substantial machined flanged bungs precisely located. It's a nice setup and deserves that.

As it is now, it the chain clears the pivot when taut although eveyone knows chains do tend to flop about vertically under dynamic and changing load conditions.

Most HD's will pull much taller than the hole-shot and wheelie gearing people seem to prefer. I prefer gearing suitable for the salt flats and try to build enough small port torque to pull it with no sweat. Being able to keep up with interstate traffic, having enough left to pass at high speed if needed, and all without the thing breaking and shaking itself to death, suits me much better than 3rd gear throttle wheelies or pulling stumps on the back 40 acres.

As far as I know, those successfully sprinting 53 inchers reduce the size of the shockingly over-sized intake ports to find reasonable port velocity for that long rod mill having an 'n' of 1.75:1. Such an engine likes long skinny intakes and exhausts, smaller rather than large carbs, and are incredibly sensitive to exhaust changes because of the intense reversion slug. Straight pipes on a long rod engine make the reversion slug stronger and harder to contain/manage leaving many wondering why their straight pipes demand a smaller main jet than with muffled exhausts.

This one came to me with a massive 51mm S&S that totally devoid of anything useful other being cognizable by the masses of bolt-on HOG bros, tractor simple to "tune" and offered impressive WOT response while pissing raw fuel out the exhaust returning 25 mpg (US) or less.

To me, that is a broken motorcycle even if it starts easy every time, and when I see such, I sure know right off the bat such a beast needs fixing.

For starters, a streetable antique motorcycle in this size range, more closely related to agricultural power plants than normally aspirated F1 or GP spec engines churning out around 3HP/CID, and that returns less than 50 mpg is broken if it isn't putting around 1HP/CID to the back tire.

So yeah, an ironhead tuned well has zero problems pulling much taller gearing than OEM gearing and they will even if stock. The 8mm belt drive in this one has the larger of the two available front pulleys. Changing overall gearing with this setup is a simple and inexpensive bolt on at the easy back wheel.
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  #34  
Old 17th September 2018
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Quote:
Originally Posted by ryder rick View Post
Sounds like putting a V8 in a Vega.

OOoooooh, cutting the gearbox off a Vincent might get you drawn and quartered in some circles!
that isn't considered as the same magnitude of cardinal sinning it used to be since you can buy repop case sets now and I gather the uptight conservationists and purists would rather see a repop set cut than OEM's having any chance of being recuperated
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