[tcb] Re: Engine Size Formula

  • From: Will Wood <evilscientistboo@xxxxxxxxxxxxx>
  • To: tcb@xxxxxxxxxxxxx
  • Date: Wed, 12 Sep 2007 10:45:46 -0500 (GMT-05:00)

Economists can't multiply complex numbers.. ;-)

88s are machine - ins.  Traditional "wisdom" was that 88s run cooler than 87.5s because of the thicker walls of the cylinders.  90.5s basically buy you the same thickness in cylinder wall.  Why didn't they do it?  Only Denis' hairdresser knows for sure.

If the sizes are as Denis says, it's a 1907, not a 1914.  Actually the guys who say they have a 1914 have a 1915...

You may have also seen out there that AAA pistons has a 92mm piston/cylinder set that uses the same machining as 94s.  This means you can run 92s with the same thick wall cylinders as 90.5s..




 

-----Original Message-----
From: sammie smith
Sent: Sep 12, 2007 10:36 AM
To: tcb@xxxxxxxxxxxxx
Subject: [tcb] Re: Engine Size Formula

Hey, we know how to calculate displacement!  My question is how did he build an engine to get 1914?  Sounds like a 78+ stroker with 88's.  Is this correct.  Are the 88's slip ins?  What?  And why didn't they do 90.5s in the first place?

mike@xxxxxxxxxxxx wrote:

Here ya go Denis,


Forumla - Bore (mm) X Bore (mm) X Stroke (mm) X 3.1416" = Engine cc

Example - 90.5 X 90.5 X 69mm X 3.1416 = 1775cc




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