Clive J
Joined: 03 Nov 2007
Posts: 340
Location: UK
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 Posted: Sun Feb 19, 2012 2:16 pm Post subject: Hydraulic or solid.... |
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2 - Positive Valve Opening. Even at lower revs a hydraulically operated valve suffers from a “soft and soggy” opening operation. By replacing this with a positive mechanical lift, a more precise motion is achieved. This leads to a faster change in manifold vacuum, greater gas speed and ……...more power!
3 - Predictable Operation. Hydraulic lifters are subjected to large and frequent variations in oil pressure and temperature. Solid lifters are a known quantity that simplify valve operation and remove such variables.
4 - Weight and friction reduction. A solid lifter is 10% lighter than it's hydraulic counterpart, and given the overall weight of CVH valve train, this is an important bonus. Any loss of weight in this area will help with engine efficiency and life expectancy. Also, a hydraulic lifter exerts a constant pressure to the total circumference of each lobe base circle resulting in a certain amount of drag. A solid lifter does not contact the camshaft base circle, so internal friction is reduced.
Remind me why they changed them? [quote][b]
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