Cool screen saver - Boxer animation - BMW Luxury Touring Community
 
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post #1 of 5 Old Jan 3rd, 2010, 7:36 pm Thread Starter
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Cool screen saver - Boxer animation

http://www.animatedpiston.com/BMW.htm

2000 K1200LT - 94,000 mi. (49,000 mine since July 4th weekend, 2009)
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post #2 of 5 Old Jan 3rd, 2010, 9:02 pm
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Re: Cool screen saver - Boxer animation

How did they do that without any oil leaks? They seem to have captured the "hesitation" part tho.
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post #3 of 5 Old Jan 4th, 2010, 10:34 am
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Re: Cool screen saver - Boxer animation

Why is the spark plug firing every time the piston is at TDC?

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post #4 of 5 Old Jan 4th, 2010, 10:50 am
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Re: Cool screen saver - Boxer animation

Quote:
Originally Posted by garry_kramer
Why is the spark plug firing every time the piston is at TDC?
That is common on many vehicles now. When the ignition timing gear is derived from the crankshaft instead of the cam drives, ignition spark will occur on every revolution of the crank, not just on every other one. Spark at end of the exhaust stroke happens, but does nothing.

Both of my cars have the ignition timing derived from crank sensors. Only older vehicles with distributors driven from the cam drive limit spark to only the power stroke.

Our LT ignition is this way also, The spark plugs fire on every stroke, since the timing is derived from the crank.

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post #5 of 5 Old Jan 4th, 2010, 11:36 am
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Re: Cool screen saver - Boxer animation

The extra spark on the exhaust stroke can also combust unburned hydrocarbons entering the exhaust stream. Doesn't do anything to help with power, but can help clean the emissions.

Dave
-2000 K1200LT
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