[Shotimes] M3 vs. GSX part 2 (long)

[Dave Kegel]

I think this is the main reason why the SHO motor sounds so unlike other
"American" V6's.  I believe most are 90 degree (Not to mention pushrods).

Dave Kegel
----- Original Message -----
From: "Ron Porter" <ronporter@prodigy.net>
To: "'Ron Childs'" <rbchilds@pacbell.net>; <shotimes@autox.team.net>
Sent: May 08, 2003 11:05 AM
Subject: RE: [Shotimes] M3 vs. GSX part 2 (long)


> Yeah, I had to go back to my original copy of the 1988 C&D SHO Road Test
to
> find it!!
>
> Ron Porter
>
> -----Original Message-----
> From: Ron Childs [mailto:rbchilds@pacbell.net]
> Sent: Thursday, May 08, 2003 11:59 AM
> To: Ron Porter; BJamesjr@aol.com; shotimes@autox.team.net
> Subject: RE: [Shotimes] M3 vs. GSX part 2 (long)
>
>
> I caught that too and went digging through my Helm manual before replying.
I
> could not find any specs on cylinder bank angle and began wondering.
>
>
> -Ron
>
>
> Ron Porter <ronporter@prodigy.net> wrote:
>
> Mr. Garber corrected me in my previous post that said the SHO V6 was a
> 90-degree motor.....it's 60-degree (DOH!!!).
>
> Anyway, I don't believe that you can offset crank pins THAT much to make
up
> that kind of a difference. Since Ford used a balance shaft, they obvious
> felt they needed it.
>
> Just "a bit of friction"?? That's what saps HP. That's why MTXs only
deliver
> 82% of the flywheel HP to the wheels...the rest is basically lost in
> "friction" of one type or another.
>
> Also, since the balance shaft is not as large and as heavy (nor as big) as
> the crank, it must be turned at a higher rpm to get the effect. Power is
> lost in turning the sprocket on the shaft, plus the bearing friction of a
> shaft most likely turning at least 2X crank speed. And the losses are
> throughout the entire rpm range.
>
> The Gen 3 V8 is quite smooth, who knows how rough it will get with the
> balance shaft out. For a race machine it wouldn't matter, but for a mild
> street machine it may be objectionable.
>
> Ron Porter
>
> -----Original Message-----
> From: shotimes-admin@autox.team.net [mailto:shotimes-admin@autox.team.net]
> On Behalf Of BJamesjr@aol.com
> Sent: Wednesday, May 07, 2003 10:50 PM
> To: shotimes@autox.team.net
> Subject: Re: [Shotimes] M3 vs. GSX part 2 (long)
>
>
> > Thinking about it again, the balance may end up being OK, but the engine
> > will not be smooth. It will shake just like a........60-degree V8.
>
> Does the V8 have offset crank pins? I think some manufacturers do this so
> that an engine such as a 90 degree V6 will actually fire like a 60 degree
> V6.
> If the V8 is made like that, then I wonder why it would need a balance
> shaft.
>
> As far as the balance shaft is concerned, I'm having a hard time
> understanding why it would require much horsepower to turn. It seems that
> there would be a bit of friction but that is all.
> Isn't the balance shaft just a shaft with eccentric weights on it? If so
> then it seems you could machine off the weights and just put the bare
> straight shaft back in place.
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