Re: [DML] ODD vs EVEN Fire

[William T Wilson <fluffy@xxxx>]

On Sat, 27 Sep 2003 doctorDHD@xxxx wrote:

> I know this has been talked about before but I can't find it... What is
> the difference between Odd and Even fire?

With odd fire, the cylinders fire in pairs, the two cylinders in the same 
"length-wise" position firing in rapid succession, then a pause, then two 
more, then another pause, then the last two. With even fire, the 
cylinders all fire individually and are distributed around the engine in 
an order which minimizes vibration and noise.

Generally odd-fire engines have more low-end torque, but even-fire engines 
run more smoothly. There's a big difference in the sound and feel, but 
not that much in the performance.

There are a lot more even fire engines around because most people value 
noise and smoothness over torque, but odd fire engines are still popular 
in places- the Viper uses an odd fire engine (but of course with five 
groups of cylinders instead of three :) )