Turbo header design

[Jemison Richard]

I have a flat crank 4.  Is that like two 2's!?????   I don't think I'm ready
to buy into this analogy.  What the 180 degree cranks will do is make your
life (from the standpoint of EFI and electronic ignition) much simpler as
you can cut the number of components in half (even the injectors if you want
to share ports with TPI) and make more horsepower at the expense of a little
more vibration.  I can't speak for v8 characteristics as I've never had one
but a 4 cyl 180 degree motorcycle will idle smoothly and create a boat load
of torque for it's size!

Rick

> -----Original Message-----
> From:	Ludis Langens [SMTP:ludis at cruzers.com]
> Sent:	Friday, January 08, 1999 5:57 AM
> To:	Diy_efi
> Subject:	Re: Turbo header design
> 
> bearbvd at sni.net (Greg Hermann) wrote:
> > A flat crank V-8 is like two fours.  Too
> > late at night to try to describe the shaking which results.
> 
> I once worked through this mental exercise.  The four cylinder hop gets
> turned into rotation back and fourth about the crank*.  The frequency is
> the same as the power pulses.  In other words, the imbalance turns into
> drive line pulses.  This info is from memory, and my original analysis
> might have been wrong.  Its too late to double check my thinking.
> 
> * It might end up being about the center of mass, which would then mean
> a more complex motion.
> 
> -- 
> Ludis Langens                               ludis (at) cruzers (dot) com
> Mac, Fiero, & engine controller goodies:  http://www.cruzers.com/~ludis/