||> together) for performance. As far as I understand, a non-VTEC engine
||can't
||> really be adjusted, the profile would have to be ground on the cam. You
||> make it sound as if adjusting the valves will give you a different cam
||> profile to adjust the power band.

On a mechanical lifter engine, you can usually get a little more torque by
running the valve clearance a little loose, Run them tight and you get a little
more high-end power.
Similarly, retarding cam timing a degree or so will often improve high-RPM
preformance.
Rex in Fort Worth

 

Rex B wrote:

> ||> together) for performance. As far as I understand, a non-VTEC engine
> ||can't
> ||> really be adjusted, the profile would have to be ground on the cam. You
> ||> make it sound as if adjusting the valves will give you a different cam
> ||> profile to adjust the power band.
>
> On a mechanical lifter engine, you can usually get a little more torque by
> running the valve clearance a little loose, Run them tight and you get a little
> more high-end power.
> Similarly, retarding cam timing a degree or so will often improve high-RPM
> preformance.
> Rex in Fort Worth

And then there are bleed-down hydraulic lifters that reduce lift and
duration at low RPM, then gradually pump up to the full cam profile as
RPM increases. Even more elegant in simplicity than VTEC.

 

On Thu, 01 Apr 2004 14:08:52 -0600, Steve <no@spam.thanks> wrote:

>Rex B wrote:
>
>> ||> together) for performance. As far as I understand, a non-VTEC engine
>> ||can't
>> ||> really be adjusted, the profile would have to be ground on the cam. You
>> ||> make it sound as if adjusting the valves will give you a different cam
>> ||> profile to adjust the power band.
>>
>> On a mechanical lifter engine, you can usually get a little more torque by
>> running the valve clearance a little loose, Run them tight and you get a little
>> more high-end power.
>> Similarly, retarding cam timing a degree or so will often improve high-RPM
>> preformance.
>> Rex in Fort Worth
>
>And then there are bleed-down hydraulic lifters that reduce lift and
>duration at low RPM, then gradually pump up to the full cam profile as
>RPM increases. Even more elegant in simplicity than VTEC.

I would call that clever but crude.

 

Gordon McGrew wrote:

>>
>>And then there are bleed-down hydraulic lifters that reduce lift and
>>duration at low RPM, then gradually pump up to the full cam profile as
>>RPM increases. Even more elegant in simplicity than VTEC.
>
>
> I would call that clever but crude.
>
>

Not at all crude. They work beautifully, ultra-reliably, and quietly.
The first generation Rhodes lifters were noisy, but not the ones in use now.