Join Date: Apr 2002
Location: San Jose, CA, USA
Re: Can someone PLEASE tell me what the different
Boxer engines (opposed twins) -
Airhead is the old style 2 valve air cooled boxer engine made before 1994.
Oilhead is the 4 valve air and oil cooled boxer engine made from 1994 to around 2004
Chrome head was basically an Oilhead that was chromed in the R1200C and CLC lines
HexHead is the latest iteration of the Boxer engine in the R1200 series of bikes since around 2005, recognizable by the somewhat hex shape of the valve covers and heads.
There are also a couple of iterations of the K motors -
The "Flying Brick", which is/was a longitudinally mounted water cooled inline 3 or 4 cylinder motor. This is what was in all K bikes up through the K1200LT.
There is also the K "Slant-4" which is the motor they use in the K1200 and 1300 S, R and GT models since 2006. It is a laterally mounted across the frame and slanted 55 degrees forward. It is also the first BMW engine to use a combined engine and transmission case and a multi-plate wet clutch.
San Jose, CA
2010 R1200RT Polar Metallic
Booze Brother #4
The shortest distance between two points is for people who don't ride!
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Last edited by DavidTaylor; Sep 15th, 2009 at 9:16 am.