Re: benefits of running mechanical lifters

[mousetrap@juno.com]

The benefit of solid (what you have called "mechanical") lifters is more
predictable valve movement at high rpm.  A hydraulic lifter will allow an
increase in valve lash (the clearance between the lifter and the heel of
the cam lobe) at high rpm, which effectively reduces the lift of the cam
-- Not a good thing for performance.  The solid lifters can deliver full
lift at any rpm.  When stiffer valve springs are used to reduce valve
float at high rpm, the hydraulic lifter lash issue is more apparent.

The benefits of hydraulic lifters are not to be overlooked however.  They
are maintenance free (no valve adjustments), hold more accurate valve
clearance than solid lifters in normal use, and are quieter.

Michael Daily
for sale: Used HP Laserjet III, good condition, $400


On Thu, 5 Jun 1997 02:35:13 -0400 Josh Clark <joshc@garden.net> writes:
>I am just wondering what the benifits of running mechanical lifters 
>over hydraulice 
>lifters would be.  I see a lot of race engines and high cmpression 
>engines being run 
>with the mechanical lifters and it just doesn't make sense to me!  Is 
>this because you 
>can manually adjust them?  How would that help?  I want to figure out 
>what I 
>am going to do with my 16v when I get the new 2.0L.  This is my plan 
>so far:
>I will sell my 1.8L 16v or maybe keep it for later and I'm am getting 
>a tall block from 
>England (the new A3 16v which has a longer stroke and 150hp STOCK!) 
>and then 
>having Techtonics or maybe this local place that does drag car stuff 
>and has a flow 
>bench port the head and running 268 Schrick cams.  The cams will 
>probably wait 
>until I get the engine in to save on initial costs.  This won't be 
>happening 'til next year 
>as I still have a bit left with my suspension/interior/exterior.  I am 
>just playing 
>with ideas.  Thanks,
> 
>\\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\\
>Josh Clark
>Visit EXC's Performance Website at:
>http://idt.net/~exc
>(201) 726 0507
>
>-We specialize in specialty European parts and 
>-wheels for VW's 
>
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