[AT] Rationale for firing orders

[Larry D. Goss]

Mine broke between cylinders three and four.  It was very obvious that
the crank flexes on that engine -- a lot!  I was plowing with it at the
time, and it just developed a loud knock.  When I idled it down, the two
halves of the engine got out of sync and it died because the spark
timing got off.  When we tore it down, the mating ends of the crank were
pretty well peened smooth from hammering against each other.

Larry

-----Original Message-----
From: at-bounces at lists.antique-tractor.com
[mailto:at-bounces at lists.antique-tractor.com] On Behalf Of Gilbert
Schwartz
Sent: Tuesday, March 23, 2004 1:04 PM
To: Antique tractor email discussion group
Subject: Re: [AT] Rationale for firing orders

Larry: We had one do that while it was running at idle speed. I just
laid it
on the fact it didn't have a center main and figured the flex just
finally
got to it. It broke right where a center main would/should have been.
Gil
----- Original Message ----- 
From: "Larry D. Goss" <rlgoss at evansville.net>
To: "'Antique tractor email discussion group'"
<at at lists.antique-tractor.com>
Sent: Tuesday, March 23, 2004 12:35 AM
Subject: RE: [AT] Rationale for firing orders


> That configuration scares me just thinking about it.  I had the
> crankshaft in a Continental N62 engine break while it was running
> (AC-G).  I'd hate to think what it would have been like if the engine
> had been designed like you are suggesting.
>
> Larry
>
> -----Original Message-----
> From: at-bounces at lists.antique-tractor.com
> [mailto:at-bounces at lists.antique-tractor.com] On Behalf Of Robert L.
> Holtzer
> Sent: Monday, March 22, 2004 11:13 PM
> To: Antique tractor email discussion group
> Subject: Re: [AT] Rationale for firing orders
>
> Four cylinder cranks are flat -- two end cylinders are up and two
center
>
> cylinders down at the same time for primary balancing.  You can figure
> out
> the various firing combinations that will work.  Anyone seen any four
> cylinder cranks with 1/2 and 3/4 paired (ie, same throw)?  Would
> probably
> be a great rocking couple to the balance!
>
> Bob Holtzer
>
> At 11:09 AM 3/22/2004 -0600, you wrote:
> >Can someone help me with a brief and simple explanation of why a
> motor's
> >firing order wouldn't always be one-two-three-four?  My Allis WCs are
> >one-two-four-three but I have no idea why....  I love to kid my
in-laws
> that
> >they've always prefered John Deere Bs because they can remember the
> firing
> >order.....
> >
> >Roger
> >
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