Bob,
When you lift the accelerator/loud pedal the engine drops its revs
faster and the synchro hubs/rings will need less effort (thus quicker)
to equalize the revs of the engine and gearbox input shaft. Also if you
have a no synchro box (racing) or worn synchro rings you have to double
declutch at down shifts which will also be faster if the engine respons
to the accelerator is better. Also banging in the gearstick at upshifts
is faster as again the engine drops its revs faster.
Hope this helps.
Kees Oudesluijs
Bob Spidell schreef:
> Good info, Kees.
>
> I still don't see how a lightened flywheel gives faster upshifts (or
> acceleration), given that revving isn't (usually) required, as it is
> for smooth downshifts.
>
>
> Bob
>
>
> Oudesluys wrote:
>> It is always hard to compare before and after the rebuild
>> performances. Before, the engine was probably tired hence the
>> rebuild. After, performance will always be better, even if the
>> rebuild is bog standard.
>> A lightened flywheel will not give you extra BHP, but it will give
>> you a better engine response and better accelleration (mainly because
>> one can shift gears quicker) at the cost of less smoothness,
>> depending of how much inertia you removed. If overdone drivebility
>> will be affected, but worse may be the possible damage to the
>> drivetrain, especially in highly tuned engines. Sometimes you get
>> pitting of the gears in the gearbox and/or differential if the engine
>> vibrations (bangs per pot) are not sufficiently damped (by the
>> inertia of the flywheel). I experienced this way back in the 60's
>> with a Fiat Abarth 1000 and a Glas 1304TS run on the track. It is
>> also sound engineering knowledge and a well known phenomina with
>> gearbox designers. It may call for different oil and/or an oil cooler
>> for the gearbox.
>> Kees Oudesluijs
>> NL
>>
> *******************************************************************
> Bob Spidell San Jose, CA bspidell@comcast.net
>
> Failure is the opportunity to begin again more intelligently. -
> Henry Ford
> *******************************************************************
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