RE: stroker cranks

["Fry, Larry" <LEF@chem-tronics.com>]

Jonathon's method is the most correct.  Potterman's doesn't factor in number
of cylinders, so you couldn't use it universally.
And, yes, Scott, stroking an other-wise-unchanged engine will most
definately increase the compression ratio, probably to right up there with
the diesels IF, IF, IF the pistons don't hit the head. 

Larry  sandiego16V

-----Original Message-----
From: Jonathan Pack [mailto:pack.39@osu.edu]
Sent: Wednesday, November 07, 2001 9:36 PM
To: Randy B; Scott F. Williams
Cc: scirocco-l@scirocco.org
Subject: Re: stroker cranks


First, I would be afraid of piston-to-head interference.  The stock pistons
come all the way to the top of the cylinders with 92.8 stroke.  Once they go
1.15mm farther...I don't know.

Second, this would substantially increase CR.  If you know chamber size and
the volume of the cutouts for the valves on the pistons, you can calculate
how much defference it will make.

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.  Somebody else posted a formula that squared
bore (diameter) instead of (bore/2), which is the radius, and what you
square to find area of a circle.

Fourth, TDI cranks are pretty spendy.  Kudos to you if you have the money to
buy one.

Jonathan


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