TowJam Posted October 3, 2005 Share Posted October 3, 2005 At the risk of sounding like a totally BMW neophyte... How do the cooling systems differ between the older airhead boxers and the current oilhead/hexhead boxers? Link to comment
Ken H. Posted October 3, 2005 Share Posted October 3, 2005 The airheads used the oil primarily for lubrication, just like most any engine. The oilhead added a second high volume, low pressure oil circuit and an oil cooler just for engine cooling. Link to comment
BMWRich58 Posted October 3, 2005 Share Posted October 3, 2005 A lot of airheads used oil-coolers,stock from the factory also. All airheads utilized the "upper two" cylinder stud tunnels as oil passages. As the oil moves through these tunnels on there way to the head/valve train area,it is cooled from the air passing over/through the cylinder fins,so doing the job of cooling the head/cylinder,and also releasing captured heat in the oil as well. One of the biggest differences between the two are the oilhead has the overhead cam setup,the airhead is still using pushies!!! Link to comment
ShovelStrokeEd Posted October 3, 2005 Share Posted October 3, 2005 Sorry Rich, the oil head still uses pushrods. The valve train is cam in head not overhead cam. There is a pushrod, albeit a short fat one that more properly could be termed a lifter. See attached. Link to comment
BMWRich58 Posted October 3, 2005 Share Posted October 3, 2005 ahhh,yes a lifter but still no pushy!!!! still one less moving part! Link to comment
James Clark Posted October 3, 2005 Share Posted October 3, 2005 ahhh,yes a lifter but still no pushy!!!! still one less moving part! Actually, the pushrods are inside the lifters. The pushrods are needed because the rocker pivot shafts are perpendicular to the camshaft axis. If the shafts were parallel, the rockers could ride directly on the camshaft. Link to comment
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