[AT] Rationale for firing orders

[Robert L. Holtzer]

Don't know about new Harleys but my 1946 61 had two rods -- knife and fork 
big ends with roller bearings.  Apparently this was done to avoid the 
cylinder offset such as Vincent used.

Bob Holtzer

At 09:12 PM 3/22/2004 -0500, you wrote:
>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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> > >
> >
> >
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