Re: Some details of the 2AZ-FE engine

On Thu, 24 Jul 2008 08:58:29 -0500, Leftie <No@[EMAIL PROTECTED]
> wrote:

>Retired VIP wrote:
>> On Wed, 23 Jul 2008 16:26:59 -0400, "C. E. White"
>> <cewhite3@[EMAIL PROTECTED]
> wrote:
>> 
>>> "Steve" <no@[EMAIL PROTECTED]
> wrote in message 
>>> news:AM6dnZjsFev_EhrVnZ2dnUVZ_vednZ2d@[EMAIL PROTECTED]
>>>
>>>> ****ms-in-a-bucket cam followers for valve adjustment is positively 
>>>> stone-age (the last car I had so-equipped was a '78 Plymouth Horizon
with 
>>>> the VW-based SOHC 4). Rocker-tip mounted hydraulic lash adjusters
that are 
>>>> common now don't carry enough mass penalty to worry about and are
commonly 
>>>> used in engines with 7500+ RPM redlines. That said, I never had to
adjust 
>>>> the valves on that VW engine either. Everything else about it sucked,
but 
>>>> the valves never needed adjustment! ;P
>>> Numerous modern engines from Toyota and Nissan do not use hydraulic
lash 
>>> adjustment. The most modern Camry V-6 does have hydraulic lash
adjusters, 
>>> the older Camry V-6 and 4 cylinders do not. The engines without
hydralic 
>>> lash adjustment do require routine valve clearance checking (if not
actual 
>>> adjustment). I think this requirment is widely ignored. Interesting,
Fords, 
>>> newest V-6 also does not have hydraulic valve adjustment - I guess
they have 
>>> learned from Toyota.
>>>
>>> Ed 
>>>
>> 
>> I guess I'm just to stupid for my ****rt.  How is increasing the amount
>> of necessary routine maintenance as well as increasing the cost of
>> operation a step forward?
>> 
>> Jack
>
>
>    There are two problems with hydraulic lifters: they are more
>expensive to build and, more to the point for us, they tend to fail long
>before the rest of the engine. Who wants to have to spend $1k on new
>lifters on a car with 150k miles on it? The ****m & bucket type setup
>rarely needs adjustment when properly designed (and it is as used by
>Toyota and Volvo in their older engines) and it doesn't fail. I've had
>two cars and one motorcycle suffer from hydraulic lifter failure. I'd
>much rather have the valves adjusted every 5 years or so.

Ok, I'll grant that hydraulic lifters are more expensive to build but
'they tend to fail long before the rest of the engine'?  Maybe for
people who don't change their oil but in over 35 years of car
owner****p, I've NEVER had hydraulic lifters fail.  I have heard a lot
of cars with solid lifters clicking and clacking down the road
sounding like an old Singer sewing machine and punching holes in their
rocker arms.

This would seem to me to be another example of why bean-counters
should be kept in a locked room.  They should never be allowed to
attend management meetings or review mechanical drawings.

Jack