In a message dated 7/26/99 2:59:09 pm, laifman@flash.net (Steve Laifman)
writes:
>Tony,
>
>Help out a little here, please.
>
>If they earlier Fords (260, 289's) used 'externally balanced' '28 oz'
designated
>flywheels (don't forget those) and balancers, they did so because the engine
>is
>not internally totally balanced, and external weights are used to compensate
>for
>the lack of crankshaft counterweight mass. As I recall, these could be
>distinguished by having three hole pulley flanges on the harmonic balancers.
>
>Accordingly the change to "50 oz" change came in '81 (I have late '82),
>with a 4
>hole pulley mount, just so you wouldn't use the wrong one!!! Note I have
>put
>those 'weights' in quotes, as they are not exactly correct. The Pro-Race
>models
>list the "actual weights", as used in their design, to be 11.8 and 12.1
>oz., but
>this could very well be what diameter they put them at. They are removable
>bolt-on. This "all steel" (except for the polymer vibration connection)
>is $348.
>
>AS most of us have learned, the "HiPo" Ford thick balancer had weights
>inside the
>timing chain cover, which significantly reduced the width of the chain.
> My
>presumption here is that some of the counterweight function assigned to
>the
>balancer was not present in the HiPo version, and was added to the timing
>chain
>area. Which would imply you don't just bolt on a HiPo balancer.
>
>Any illumination here?
>
>(Oh, yes, the flywheel had some of the extra weight, and they differ between
>models too)
>
>--
>Steve Laifman < Find out what is most >
>B9472289 < important in your life >
> < and don't let it get away!>
Well,Steve I agree with almost everything in your masterful discourse.I am
well aware of the fact that these Ford engines(260,289,etc) finished off the
act of balancing the engine externally,at both ends.The 302 used both an
early 3 hole version and an after 70 a 4 hole version of the 28 oz
imbalance piece.The question was about Harmonic balancers.I assumed that Tym
was looking for the 3 hole variety since his original query was about
289balancers and not 302 pieces so I focused my answer there.I found it odd
that the SVO steel balancer listed that it could be used with so many
different Ford engines.I just read that from the side of the actual part
box,right here(the piece has both 3 and 4 hole bolt patterns integral to
it,so either pulley would work) I further assumed that the SVO piece would
work with a 260,since Ford says that it would work with a 289.I think I am
safe here since a 260 is not the subject of this question,but if someone had
a need to use the SVO part in this manner,they should ask thier Ford dealer
for more info,since we know what happens to people who "ASS UME"
By the way Ford was using 4 bolts to fasten the pulley to the balancer hub
way before the 1980-81 change over to 50 oz <A
HREF="http://www.ventureproducts.com/catalog1382.html";>Harmonic Balancers</A>
.look at item #V1066 most of the way down the page.(click on the buy/more
info black box for a larger picture once you are there)
Have a Great Day!
Tony
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