[Healeys] Lightened flywheels
michaelsalter at gmail.com
Tue Sep 7 15:24:29 MDT 2021
The total mass of the flywheel is not completely relevant insofar as engine
moment of inertia is concerned.
What is important is the mass removed times the square of the radius, so
just how much weight has been removed per se is not important.
Secondly removing rotational inertia is not always the best thing to do, if
it was you can be assured that manufacturers would be all over it as a way
to save money.
The rotational mass is often designed in to protect the drive train, in
particular the gearbox.
Thirdly lightening a flywheel in of itself has very little effect on
acceleration. An engine with a lightened flywheel may accelerate to 6000
RPM 1 - 2 seconds more quickly but that doesn't necessarily equate to 1-2
seconds faster to 60 MPH. You may be able to shift marginally faster if the
gearbox can stand the extra loads and the 4 to 5 pounds off vehicle weight
is really only the equivalent of half a tank of fuel. (Who ever notices
that their car accelerates more quickly with a half full gas tank).
On Tue., Sep. 7, 2021, 4:17 p.m. Earl Kagna via Healeys, <
healeys at autox.team.net> wrote:
> I have Bill Bolton lightened flywheels in both my Healeys. According to
> Kent Lambert, who took over Bills Healey business awhile back, the stock
> weight (6 cyl) is 28.5 pounds, and Bills machining program reduced them to
> Both of my cars run just fine, no problems at all in the 20 + or so years
> that I’ve had them installed.
> Earl Kagna
> Victoria BC
> BJ8, BT7 tri-carb
> *From:* Healeys <healeys-bounces at autox.team.net> *On Behalf Of *richard
> *Sent:* Tuesday, September 7, 2021 10:23 AM
> *To:* healeys <healeys at autox.team.net>
> *Subject:* [Healeys] Lightened flywheels
> 6 cylinder flywheels vary slightly but are all generally in the 29 pound
> range. Very aggressive machine work can get the weight down to the 22-23
> pound range.
> How much weight you take off will affect your driving style. To maintain
> the feel of a stock Healey while still improving the engines response, I
> suggest removing no more than 3 pounds.
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