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
Moderator
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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.”


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1970 R60/5, '77 R75/7-R100, '85 K100'87 K75C, '87 K100RS, '93 K11-K12 Big Block, '93 K1100RS, '95 R100-Mystic, '96 K1100RS, '98 K1200RS, '00 K1200RS, '02 K1200RS, '03 K1200GT, '04 R1150R'04 R1150RT, '05 K1200S, '06 K1200R, '07 K1200R, '09 K1300GT, 2013 R1200RT-P & 2022 S1000XR Triple Black



"It does not do to leave a live dragon out of your calculations, if you live near him."
~J.R.R. Tolkien
    

Two Wheels Better

Two Wheels Better
Moderator
Moderator
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."


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1970 R60/5, '77 R75/7-R100, '85 K100'87 K75C, '87 K100RS, '93 K11-K12 Big Block, '93 K1100RS, '95 R100-Mystic, '96 K1100RS, '98 K1200RS, '00 K1200RS, '02 K1200RS, '03 K1200GT, '04 R1150R'04 R1150RT, '05 K1200S, '06 K1200R, '07 K1200R, '09 K1300GT, 2013 R1200RT-P & 2022 S1000XR Triple Black



"It does not do to leave a live dragon out of your calculations, if you live near him."
~J.R.R. Tolkien
    

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 ."


__________________________________________________

1970 R60/5, '77 R75/7-R100, '85 K100'87 K75C, '87 K100RS, '93 K11-K12 Big Block, '93 K1100RS, '95 R100-Mystic, '96 K1100RS, '98 K1200RS, '00 K1200RS, '02 K1200RS, '03 K1200GT, '04 R1150R'04 R1150RT, '05 K1200S, '06 K1200R, '07 K1200R, '09 K1300GT, 2013 R1200RT-P & 2022 S1000XR Triple Black



"It does not do to leave a live dragon out of your calculations, if you live near him."
~J.R.R. Tolkien
    

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


__________________________________________________

1970 R60/5, '77 R75/7-R100, '85 K100'87 K75C, '87 K100RS, '93 K11-K12 Big Block, '93 K1100RS, '95 R100-Mystic, '96 K1100RS, '98 K1200RS, '00 K1200RS, '02 K1200RS, '03 K1200GT, '04 R1150R'04 R1150RT, '05 K1200S, '06 K1200R, '07 K1200R, '09 K1300GT, 2013 R1200RT-P & 2022 S1000XR Triple Black



"It does not do to leave a live dragon out of your calculations, if you live near him."
~J.R.R. Tolkien
    

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."


__________________________________________________

1970 R60/5, '77 R75/7-R100, '85 K100'87 K75C, '87 K100RS, '93 K11-K12 Big Block, '93 K1100RS, '95 R100-Mystic, '96 K1100RS, '98 K1200RS, '00 K1200RS, '02 K1200RS, '03 K1200GT, '04 R1150R'04 R1150RT, '05 K1200S, '06 K1200R, '07 K1200R, '09 K1300GT, 2013 R1200RT-P & 2022 S1000XR Triple Black



"It does not do to leave a live dragon out of your calculations, if you live near him."
~J.R.R. Tolkien
    

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