[AT] Rationale for firing orders

[charlie hill]

I never said they were the same Skip but they both skip a beat or two.
grins

Charlie
----- Original Message ----- 
From: <BetCleve321 at aol.com>
To: <at at lists.antique-tractor.com>
Sent: Monday, March 22, 2004 5:49 PM
Subject: Re: [AT] Rationale for firing orders


> In a message dated 3/22/2004 4:37:37 PM Eastern Standard Time,
chill8 at cox.net
> writes:
> I think that nothing  nothing has helped the popularity of JD's about as
> much as it has Harley Davidson.  And that is a good bit.
>
> Charlie
> Well, Harley Davidson engines are spaced quite differently than poppin'
> Johnnys. JDs have a 180degree crank with the pistons rising and falling at
> different times. One up , one down.
> HDs on the other hand have their pistons rising and falling together
although
> the two cylinders are splayed 52 degrees apart.  You do the math. Firing
> sequence will be slightly uneven as a result rather than a smooth beat
such as a
> Triumph or BSA twinn. Balancing problems are hell, The JD layout has
primary
> balance worked out but firing impulses are uneven.
> They both sound good though.
>
> Skip
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