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      02-14-2012, 11:33 PM   #4
walsh
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Drives: 2015 F82 M4
Join Date: Dec 2008
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Quote:
Originally Posted by username11 View Post
He wrong.

"The single-piece aluminium cylinder heads feature four valves per cylinder in characteristic BMW style. The valves weighing 42 grams each are activated by ball-shaped cup tappets with hydraulic valve play compensation. Tappet diameter is only 28 millimetres or 1.10, while the intake and exhaust valves measure 35 and respectively 30.5 millimetres (1.38 and 1.20) in diameter. Measuring only 5 millimetres or 0.20 across, the valve shaft has hardly any influence on flow conditions in the intake manifold, while the hydraulic valve play compensation rules out any change in valve play, ensuring lasting reliability and at the same time reducing the cost of maintenance." (http://www.automobilemag.com/auto_sh...se/weight.html)
yea... what he said
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