[Healeys] Flywheels

[Oudesluys]

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

pennell at cox.net schreef:
> Ken,
>
> I disagree.  I cannot tell any difference in smoothness of engine.  It does rev noticeably quicker than my BJ8.  Does it make a difference in acceleration/performance?  I have no data but it feels quicker.
>
> Keith
>
>   
>> For what its worth: I am no longer a fan of lightened flywheels. Too
>> much jerking in slow traffic and slowing down for stop lights.
>> Ken Freese
>> 65 BJ8
>>
>> -----Original Message-----
>> From: healeys-bounces at autox.team.net
>> [mailto:healeys-bounces at autox.team.net] On Behalf Of Dan
>> Sent: Tuesday, February 17, 2009 12:25 PM
>> To: healeys at autox.team.net
>> Subject: [Healeys] Flywheels
>>
>> I have a BJ7 with engine number 29F-H4376 and am getting ready to do
>> some engine work. I have read here that a lightened flywheel will
>> improve performance. I want to ask the group if anyone knows how much
>> lighter the BJ8 flywheel is compared to the BJ7. Also, your thoughts if
>> the BJ8 flywheel is the best option or should I have mine machined down
>> or purchase an aluminum flywheel? Thanks for any input.
>>
>>
>>
>> Dan Serrao
>>     
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