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Old 01 Apr 2004, 12:59 pm
Rex B
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Default Re: V-TEC/Non-V-TEC?


||> 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
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Old 01 Apr 2004, 02:08 pm
Steve
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Default Re: V-TEC/Non-V-TEC?

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.


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Old 02 Apr 2004, 12:18 am
Gordon McGrew
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Default Re: V-TEC/Non-V-TEC?

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.


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Old 02 Apr 2004, 10:08 am
Steve
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Default Re: V-TEC/Non-V-TEC?

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.

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