Re: stroker cranks

[Dan Bubb <jdbubb@ix.netcom.com>]

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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