Great info Greg.
The throttle response was one of the problems mentioned on JHPS (Jensen
Healey Preservation Society). Unless you are going to be racing there is
not a really good reason to have a super lightweight flywheel. Very twitchy
and more difficult to control RPM since the engine can rev so much quicker
with out the heavy anchor to turn. Absolutely no gain in power, just
torque, but with a price.
On the Jensen I think the weight savings with a modified stock flywheel is 6
pounds, and with the aluminum about 11 pounds. Stock is about 21 pounds.
And thanks Mike for the machine shop info.
Clif 74 Jensen Healey
--------------------------------------------------
From: "Greg Tatarian" <gtwincams@gmail.com>
Sent: Friday, November 19, 2010 8:12 AM
To: <nobbc@autox.team.net>
Subject: Re: [Nobbc] THANKSGIVING RIDE
> Clif,
>
> Try JNW Engine http://jnweng.com/
> Talk to Jerry and tell him Greg Tatarian with the Lotuses sent you. I put
> on a tech session at Jerry's shop last year for the NOBBC.
>
> Not sure anyone's going to measure 10 microns - they are going to cut
> until the surface is smooth and flat, but you can ask him to go as lightly
> as possible. If it's just light surface rust, I would use a surface plate
> and 120-150 grit paper, myself, and save the $40 (at least for flywheels
> that have the friction surface level or raise above the surrounding
> portion).
>
> Pros and cons of lightened steel vs. stock, vs. aluminum flywheels are
> generally not specific to any car make or model but are pretty uniform;
> lightened steel needs to be done properly or you can have it fly apart on
> you at high revs. Stock is fine, but heavy. Aluminum flywheels have to
> have the right design and treatment for the aluminum so that the steel
> flywheel face and surrounding aluminum material expand and contract much
> as a unit, and so the aluminum isn't too soft, and the replaceable steel
> insert has to be available for future replacements. Some don't like alu
> because it affects apparent torque, particularly with small, light motors
> coming off the line. Some poorly designed or made units have had problems
> with ring gear coming off (same problem of differential expansion rates,
> as well as different pinning methods). Lighter flywheels definitely make
> the motor more throttle responsive. Don't forget to check the tooth bevel
> of the ring gear on the new f/w matches the engagement of your starter
> (front or back), as we talked about in Napa.
>
> Cheers,
> Greg
>
>
>
>
>
>
> On 11/18/2010 11:36 PM, Clif & Deborah Williamson wrote:
>> Does anybody know a good shop for this operation? I think 10 microns is
>> required.
>> Thank,
>> Clif 74 JH
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