BMW K bikes (Bricks)


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Two Wheels Better


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Mysteries of Lubrication ~ KC

Peaks will hit peaks and the resulting metal-to-metal contact will produce a shower of damaging wear particles. Failure soon follows.

- Kevin Cameron

    

Two Wheels Better

Two Wheels Better
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Yvon DuHamel Dies at Age 81 ~ KC


Gary Nixon asked him, “Whyn’t you pass him when you had the chance?” Cliff answered, “Because I didn’t want to find out what he’d do if I did.”


__________________________________________________
1977 R75/7-100, '93 K11/K12 Big Block, '95 R100 Mystic, '96 K1100RS, '98 K1200RS, '06 K1200R & '09 K1300GT. Projects: 1993 & '96 K1100RS, & 1st '98 K1200RS.
The Mystic, Big Block, 2nd K1200RS, K12R & K13 are running & ridable.
    

Two Wheels Better

Two Wheels Better
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Treasures & Scrap ~KC

Why we value the bikes we do.

"...people old enough to know and want such things are now also old enough to be considering the final forwarding address. The market isn’t rising. All that can be hoped for is that someone will have enough interest to give them a place indoors."


__________________________________________________
1977 R75/7-100, '93 K11/K12 Big Block, '95 R100 Mystic, '96 K1100RS, '98 K1200RS, '06 K1200R & '09 K1300GT. Projects: 1993 & '96 K1100RS, & 1st '98 K1200RS.
The Mystic, Big Block, 2nd K1200RS, K12R & K13 are running & ridable.
    

Two Wheels Better

Two Wheels Better
Moderator
Moderator
Keeping Engines Cool ~ KC

"As observed by the late F1 engine designer Keith Duckworth, everything improves when you put four valves in place of two. Think of the effect on the distance from the hottest part of the valve — its center — to the valve seat through which most heat flows out of the valve. That distance becomes much shorter for two small exhaust valves than for a single larger one of the same area."

Keeping Engines Cool Part II ~ KC

Keeping Engines Cool Part III ~ KC

"As engine output continued to climb, measurements showed a steep temperature gradient in the traditional iron liners used in so many aluminum cylinders. If designers could get rid of that steep gradient, piston temperature would drop by a significant amount. So with a clatter, those iron liners, dignified though they were by 100 years of use, went into history’s dumpster. They were replaced by very thin layers of hard plating—chromium at first, then more durable Nikasil and other coatings."


__________________________________________________
1977 R75/7-100, '93 K11/K12 Big Block, '95 R100 Mystic, '96 K1100RS, '98 K1200RS, '06 K1200R & '09 K1300GT. Projects: 1993 & '96 K1100RS, & 1st '98 K1200RS.
The Mystic, Big Block, 2nd K1200RS, K12R & K13 are running & ridable.
    

Two Wheels Better

Two Wheels Better
Moderator
Moderator
Thoughts On Oil Viscosity ~KC

"Early lubrication researchers were astounded to see that the oil pressure in a plain bearing’s loaded zone could be hundreds or even thousands of pounds per square inch. Such pressure is what supports the load, and it comes not from the engine’s 40-60 psi oil pump but from the oil’s viscosity."


"In some cases we can reduce friction by reducing oil viscosity, but we must take care that the minimum oil-film thickness doesn’t drop so low that the irregularities on the mating surfaces come into contact with each other. During the early 1990s lower-viscosity oils began to appear, such as 0w-15, but they could be used only in engines with suitably refined surface finishes."

~Kevin Cameron


__________________________________________________
1977 R75/7-100, '93 K11/K12 Big Block, '95 R100 Mystic, '96 K1100RS, '98 K1200RS, '06 K1200R & '09 K1300GT. Projects: 1993 & '96 K1100RS, & 1st '98 K1200RS.
The Mystic, Big Block, 2nd K1200RS, K12R & K13 are running & ridable.
    

Two Wheels Better

Two Wheels Better
Moderator
Moderator
Getting To 100% ~ K.C.
"Because wind and solar outputs vary, our (U.S.) national electricity grid would need ways to compensate for loss of solar at sundown, as well as wind variations from dead calm to gale force. During 2020, 60 percent of US electric power came from combustion and 20 percent from nuclear, with wind supplying 8.4 percent and solar 2.3 percent; the balance came from hydroelectric at 7.3 percent and geothermal with 0.4 percent."

"On the first point, it is certainly possible to use high-voltage transmission lines to move power over long distances. As an example, at present Australia plans to generate 10,000 MW of solar power on 58 square miles of solar panels and transmit it 2,600 miles undersea to Singapore by high-voltage DC cables; the Australian city of Darwin will also receive some of this power. Proposed opening is in 2027, and it would make this project the largest solar-generation and battery-storage system in existence. Projected cost is $22 billion USD. This is expected to provide 15 to 20 percent of Singapore’s electric power demand, and a funding agreement is expected in 2023."


__________________________________________________
1977 R75/7-100, '93 K11/K12 Big Block, '95 R100 Mystic, '96 K1100RS, '98 K1200RS, '06 K1200R & '09 K1300GT. Projects: 1993 & '96 K1100RS, & 1st '98 K1200RS.
The Mystic, Big Block, 2nd K1200RS, K12R & K13 are running & ridable.
    

Two Wheels Better

Two Wheels Better
Moderator
Moderator
The Five-Angle Valve Job ~K.C.

"Back in the days of Supersport racing, the “Contingency Gypsies” (riders who lived on the road, paying their bills with factory contingency money) spoke about five-angle valve jobs as though they were a key to achieving a higher state of being."


__________________________________________________
1977 R75/7-100, '93 K11/K12 Big Block, '95 R100 Mystic, '96 K1100RS, '98 K1200RS, '06 K1200R & '09 K1300GT. Projects: 1993 & '96 K1100RS, & 1st '98 K1200RS.
The Mystic, Big Block, 2nd K1200RS, K12R & K13 are running & ridable.
    

Two Wheels Better

Two Wheels Better
Moderator
Moderator

“Fetch me a couple handfuls of mud from that stream and I’ll show you something interesting.”


Using The Laser Hammer ~ K.C.

A ball-peen hammer isn’t the only way to pound metal into compression.


__________________________________________________
1977 R75/7-100, '93 K11/K12 Big Block, '95 R100 Mystic, '96 K1100RS, '98 K1200RS, '06 K1200R & '09 K1300GT. Projects: 1993 & '96 K1100RS, & 1st '98 K1200RS.
The Mystic, Big Block, 2nd K1200RS, K12R & K13 are running & ridable.
    

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