Re: stroker cranks

["Marc Peterson" <mpeters6@rochester.rr.com>]

AHHHHHHH...Make it stop! Make it stop!  Math...hurting...brain!

Marc
----- Original Message -----
From: "Dan Bubb" <jdbubb@ix.netcom.com>
To: "Randy B" <sirocco@telocity.com>
Cc: "Cheapass Ron" <rapieper@yahoo.com>; "Jonathan Pack" <pack.39@osu.edu>;
"Scott F. Williams" <sfwilliams@home.com>; <scirocco-l@scirocco.org>
Sent: Thursday, November 08, 2001 2:54 PM
Subject: Re: stroker cranks


> Area of a circle is; pi x r^2 or pi x d^2/4
> volume of one cylinder is pi x r^2 x Stroke
> Volume of the engine is pi x r^2 x Stroke x # of cyl.
> or if you want to do diameter instead of radius:
> pi x D^2/4 x stroke x # of cyl.
>
> Randy B wrote:
> >
> > Ron Wrote:
> >
> > > Someone posted that Jonathan's formula is wrong, NOT, it's dead right.
> > >
> > >
> > > Another formula floating around on this thread has both the numerator
> > > and denominator multiplied by 4, which is goofy.  It seemed to work,
> > > but it's jes' plain goofy.
> >
> > Ron,
> > It would only be goofy if all engines were 4cyl.
> > I got the formula I typed earlier from Greg Raven's VW Performance
Handbook.
> > The 4 in the numerator represented the # of cylinders (why I initially
wrote
> > it that way).
> > I do not know exactly what the 4 in the denominator represents but I
dont
> > think it is the # of cylinders.
> > I found another formula for displacement at this website:
> > <http://www.nightrider.com/biketech/calc_formulas_page.htm>
> > By moving the Stroke and Displacement to the correct sides of the
equation
> > you would get the following:
> > D = S * (pi) * B * B * C / 4
> >
> > D = displacement in liters (divide by 1000 for cc's)
> > S = stroke
> > (pi) = 3.1416
> > B = bore
> > C = # of cylinders
> >
> > > (bore/2)^2 * pi * stroke * (# of cyls) / 1000
> >
> > Why do you divide the bore by 2 and then square it, I don't follow the
logic
> > even though the answer is correct?
> > Would this equation work on other than 4cyl engines?
> >
> > Randy
> > (wish i'd paid more attention during my algebra classes)
> >
> > su.edu> wrote:
> > > > Third, the formula for volume of a cylinder is pi*h*r^2.  In engine
> > > > terms,
> > > > this means pi*stroke*(bore/2)^2 is displacement of each cylinder in
> > > > mm^3.
> > > > Divide that by 1000 to get displacement in cm^3.  Multiply by number
> > > > of
> > > > cylinders and you've got it.
> > >
> > >
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> > >
> >
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