http://www.ret-monitor.com/articles/838/friction-and-the-camshaft/ Specific mission-critical info for professionals Fri, 10 Feb 2012 12:41:21 +0000 http://wordpress.org/?v=2.7.1 hourly 1 http://www.ret-monitor.com/articles/838/friction-and-the-camshaft/comment-page-1/#comment-5874 Terry Sun, 09 Jan 2011 07:01:05 +0000 http://www.ret-monitor.com/articles/838/friction-and-the-camshaft/#comment-5874 You must consider that the reason that camshaft end moment frictions increase over the nose is due to higher contact normal forces from the valve spring, and that the contact interface itself is occurring at a greater moment radius (ie. base circle diameter plus lift). You must consider that the reason that camshaft end moment frictions increase over the nose is due to higher contact normal forces from the valve spring, and that the contact interface itself is occurring at a greater moment radius (ie. base circle diameter plus lift).

]]> http://www.ret-monitor.com/articles/838/friction-and-the-camshaft/comment-page-1/#comment-3073 Tony Morris Wed, 24 Feb 2010 02:45:35 +0000 http://www.ret-monitor.com/articles/838/friction-and-the-camshaft/#comment-3073 By its nature the roller tappet will not experience the high levels of cam friction torque seen in figure 2 regardless of film thickness and entrainment velocity. Wear and peak pressures might be a different matter. By its nature the roller tappet will not experience the high levels of cam friction torque seen in figure 2 regardless of film thickness and entrainment velocity. Wear and peak pressures might be a different matter.

]]> http://www.ret-monitor.com/articles/838/friction-and-the-camshaft/comment-page-1/#comment-3031 John Coxon Wed, 17 Feb 2010 18:04:59 +0000 http://www.ret-monitor.com/articles/838/friction-and-the-camshaft/#comment-3031 The graphs here refer to a typical flat tappet arrangement in a direct acting mechanical bucket. Other valvetrains will have a different mix of lubricant regimes and therefore may be less sensitive to anti-wear packages. However in any lube formulation one musn't forget the requirements of the piston ring. The graphs here refer to a typical flat tappet arrangement in a direct acting mechanical bucket. Other valvetrains will have a different mix of lubricant regimes and therefore may be less sensitive to anti-wear packages. However in any lube formulation one musn’t forget the requirements of the piston ring.

]]> http://www.ret-monitor.com/articles/838/friction-and-the-camshaft/comment-page-1/#comment-3029 brianathasport Wed, 17 Feb 2010 15:56:26 +0000 http://www.ret-monitor.com/articles/838/friction-and-the-camshaft/#comment-3029 What about on a roller rocker and cam? If I understand correctly the entrainment velocity is constant and this is less of a problem. What about on a roller rocker and cam? If I understand correctly the entrainment velocity is constant and this is less of a problem.

]]>