[AT] Rationale for firing orders

[George Willer]

Thomas,

Don't the Harley cylinders have separate connecting rods?  Radial aircraft
engines have (usually) one master rod on the crank throw and all the others
fasten to it.

George Willer

----- Original Message ----- 
From: "Thomas O. Mehrkam" <tomehrkam at houston.rr.com>
To: "Antique tractor email discussion group" <at at lists.antique-tractor.com>
Sent: Monday, March 22, 2004 8:53 PM
Subject: Re: [AT] Rationale for firing orders


> The Harley is actually a two cylinder radial engine. Like an airplane
> engine with several pistons missing.
>
> BetCleve321 at aol.com wrote:
>
> > 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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