[SEL] Did they ever make?

[Prepair Ltd]

On Sat, 1 Jan 2005 03:36:20 -0800 (PST), you wrote:
>I wonder why John Deere's don't fire evenly. I think they are 90 degrees
 from eachother which means they fire say at 0 degrees then the other
cylinder fires at 90 degrees, then it wouldn't fire again for 630
degrees ??? 360 X 2 = 720 - 90 for the second cylinder = 630 . So it
would fire 0 , 90, 630 , 720.  Love the sound of one running at  slow
speed.  You just can't duplicate that sound with any other type of
engine. 
>Enough
>Ron 

They are almost certainly 180 degrees, same as most Lister twins. You
then get a 'bang, bang, silence, silence' sort of firing which does
sound odd but the balance is better than 360 degree cranks like the
british motorcycles had, the firing pulses were even but the balancing
was awful.

I think the big Fairbanks-Morse up at the Mount Wilson observatory has
360 degree cranks if my memory isn't too bad.

 
Peter
--
Peter A Forbes
Prepair Ltd, Luton, UK
prepair at easynet.co.uk
http://www.prepair.co.uk