Sports: Re: [DucatiST] The New Ducati Engine!

I've always believed it was the bore/stroke ratio that determined the "squareness" of an engine.

But, maybe you said that? Is that what you mean by "swept area of the piston"?

-Bob

----- Reply message -----
From: "Gary L. Smith" <lgranch@laughing-gargoyle.com>
Date: Wed, Oct 12, 2011 1:51 pm
Subject: [DucatiST] The New Ducati Engine!
To: <st2_owners@yahoogroups.com>

OK Hopper et all,
My understanding of "over square" is that the swept area of the
piston is longer than the bore of the cylinder. An "under square"
engine is one that has a bore larger than the swept area of the piston.
Please correct me if I'm wrong and explain please.

Thanks,
Gary '01 ST4 Gaston, OR

On 10/12/2011 7:07 AM, HOPPER ELDRIDGE wrote:
>
> Nick, go back to the information page and search through it. There are
> a lot of tech pages in there. The engine is rotated a bit back for
> more clearance to the front wheel but not as much as I figured it
> would be from earlier information I had read...6 dgrees if I remember
> correctly.
> I agree with you too in that the bike is getting too complicated and
> tech oriented. You'll shudder every time it rains or you give it a
> bath. The newer bikes have too many problems as it is...now this one.
> Love the HP readings but as you go to higher over square numbers, the
> HP is shifted further up the RPM range. The power curves were nicely
> linear though, not curvilinear. The basic design of a 90 degree V twin
> will give better torque than other designs but the over square figures
> will null that out to a point.
> On my olde racing Norman White Norton Commando, we used a drag race
> cam with the idea that a heavy flywheeled long stroke vertical twin
> had enough torque in basic design but needed more HP. The bike did
> well enough in BOTT that Tony Rutter approached Norm about racing it
> in the '84 IOM pre-72 production class until that class was
> eliminated...bummer!
> Cheers...Hopper
> --- On *Wed, 10/12/11, Nick Woods /<nickw@cooptel.net>/* wrote:
>
>
> From: Nick Woods <nickw@cooptel.net>
> Subject: Re: [DucatiST] The New Ducati Engine!
> To: st2_owners@yahoogroups.com
> Date: Wednesday, October 12, 2011, 1:46 AM
>
>
>
> --- In st2_owners@yahoogroups.com
> <http://us.mc807.mail.yahoo.com/mc/compose?to=st2_owners%40yahoogroups.com>,
> Jan Wysocki <st@...> wrote:
> >
> > I'm not entirely sure it's _my_ future.
> >
> > Ok, it's a desmo L-twin
>
> Yes, still a 90-degree motor, but did anyone else notice that the
> engine on the stand seemed to be rotated backwards to give a
> more-conventional vee configuration? I couldn't be sure of the
> angle of the datum line provided by the script on the clutch case,
> 'cos there were just too many atmospheric soft-focus close-ups....
>
> It's obvious that the only thrust of Ducati is top-end bhp, with
> masses of high-tech gizmos to make the thing rideable at more
> modest speeds, but I guess that's what sells bikes these days.
> Probably it was always that way, and only the technology has changed.
>
> NickW, UK
>
>

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