[DeTomaso] Ford flywheel size and weight????

Larry - Ohio Time Larry at ohiotimecorp.com
Wed Jun 11 12:13:00 EDT 2014


Please file this in the stupid questions folder.

Why are not each component balanced to zero. Then when assembled it could be
balanced to a small amount to refine it.

Do not understand the principle behind this way of doing balancing.

Thanks,

Larry - Cleveland



-----Original Message-----
From: DeTomaso [mailto:detomaso-bounces at poca.com] On Behalf Of Daniel C
Jones
Sent: Wednesday, June 11, 2014 11:14 AM
Cc: De Tomaso List
Subject: Re: [DeTomaso] Ford flywheel size and weight????

> He ordered a 347 stroker kit for the 302 and they wanted to know how many
teeth on the flywheel.

Presumably, they are making an assumption on the imbalance.  All
289/302/351W/351C 164 teeth flywheels were 28.2 oz-in, though the same
flywheel on a 300 I6 was neutral balance.  Later 5.0L's used a 157 teeth
flywheel with a 50 oz-in balance factor.  Be aware that some people use
flexplate and flywheel interchangeably.  Though the 5.0L HO used a 157
teeth flywheel with a T-5 5 speed manual transmission, the same engine used
a 164 teeth flexplate when mated to an AOD automatic overdrive transmission.

> The crank/rods/pistons are the same, regardless of the flywheel.

Some manufacturers make different kits for different balance factors (and
assumed rod length). The raw forgings are the same but the cranks are
finish machined to be easily balanced to a particular imbalance and
bob-weight.  Some of the Scat kits, for instance, are designed to need only
drilling (no Mallory metal) to balance.  Trying to internally balance a kit
designed for 50 oz-in can cost more in Mallory metal and machining than the
crank cost so it pays to know what you are getting.  The manufacturer
should be able to tell him you imbalance (and even bob-weight) the kit was
designed for.  You want to avoid 50 oz-in unless you plan on keeping the
revs down and need to re-use an existing balancer.  Depending upon the kit,
internal balancing may require a fair bit of mallory metal. 28.2 oz-in is
fine for most uses.

Be aware that most balancers for 28.2 oz-in require a spacer to work with
the OEM 5.0L HO serpentine belt accessory drive.

Dan Jones


On Mon, Jun 9, 2014 at 8:57 PM, Jerry Knotts <knottsj at galstar.com> wrote:

> There are many questions that I can't answer but this one is vexing.
>
> A Chrysler motor builder friend of mine is working on a Ford 302 and asked
> me a question about flywheel tooth counts.  He ordered a 347 stroker kit
> for the 302 and they wanted to know how many teeth on the flywheel.  He
> asked me why they needed that information?
> I fumbled through all my extraneous explanations.  There are 2 major tooth
> configurations 157 and 164 lesser used 148 teeth.  There and 2 major
> imbalance configurations 28oz and 50oz lesser used 0oz.  Both balances
take
> a particular harmonic balance that is compatible with the imbalance of the
> flywheel.  Backing plate sizes and starter ends vary by diameter and depth
> for standard and auto trans and flywheel teeth.
> I finally figured out I have no idea.
>
> Is there a concise explanation.  If so what is it.
>
> Thanks in advance,
> jerry knotts
>
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