[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: stroker cranks



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.
>
>
> __________________________________________________
> Do You Yahoo!?
> Find a job, post your resume.
> http://careers.yahoo.com
>


--
Email LIST problems to: scirocco-l-probs@scirocco.org.
To unsubscibe send "unsubscribe scirocco-l" in the message to majordomo@scirocco.org