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1. 02:16 PM - Hydraulic or solid.... (James, Clive R)
2. 11:19 PM - Re: Hydraulic or solid.... (Carl Meek)
3. 11:40 PM - Oil circuit? (James, Clive R)
Message 1
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| Subject: | Hydraulic or solid.... |
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?
Message 2
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| Subject: | Re: Hydraulic or solid.... |
Having owned both, and discussing this with 3 other owners at our field, I a
m happier with my current solid lifter engine. My previous engine always ran
very hot oil temps (from new to 150 hours) despite many attempts to rectify
. Oil was always very dark, even 1 flight after oil change. All solid lifter
engines on the field ran cooler. To do with hydraulic lifters? Not sure....
But that's what we all blame.
Sent from my iPhone
On 19 Feb 2012, at 22:15, "James, Clive R" <clive.james@uk.bp.com> wrote:
> 2 - Positive Valve Opening. Even at lower revs a hydraulically operated va
lve suffers from a =9Csoft and soggy=9D opening operation. By r
eplacing this with a positive mechanical lift, a more precise motion is achi
eved. This leads to a faster change in manifold vacuum, greater gas speed an
d ...more power!
>
> 3 - Predictable Operation. Hydraulic lifters are subjected to large and fr
equent 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, thi
s is an important bonus. Any loss of weight in this area will help with engi
ne efficiency and life expectancy. Also, a hydraulic lifter exerts a constan
t 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 c
ircle, so internal friction is reduced.
>
> Remind me why they changed them?
>
>
>
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Message 3
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