[AT] Rationale for firing orders

[Larry D. Goss]

I think you'd find that the pairing of 1/2 and 3/4 would give a firing
order of 1-3-2-4, or something similar.  Pairing the cylinders puts both
pistons at TDC and BTC at the same time but lets them fire 360 degrees
from each other.

In the discussion on this thread that went by yesterday with talk of the
JD that had the reworked crank, nobody seems to mention the problems of
coming up with a cam that works with that setup.  That's every bit as
much of a problem as the crank.

Larry

-----Original Message-----
From: at-bounces at lists.antique-tractor.com
[mailto:at-bounces at lists.antique-tractor.com] On Behalf Of Dudley Rupert
Sent: Tuesday, March 23, 2004 12:48 AM
To: Antique tractor email discussion group
Subject: RE: [AT] Rationale for firing orders

Larry:
Right ... But, in trying to see the humor in this how about if you fire
1&2
simultaneously and then 180 degrees later fire 3&4 and then 540 degrees
later be back to firing 1&2 -- be kind of like two John Deeres in sync -
Dudley
Snohomish, Washington

-----Original Message-----
From: at-bounces at lists.antique-tractor.com
[mailto:at-bounces at lists.antique-tractor.com]On Behalf Of Larry D. Goss
Sent: Monday, March 22, 2004 10:36 PM
To: 'Antique tractor email discussion group'
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
>
>_______________________________________________
>AT mailing list
>http://www.antique-tractor.com/mailman/listinfo/at


_______________________________________________
AT mailing list
http://www.antique-tractor.com/mailman/listinfo/at

_______________________________________________
AT mailing list
http://www.antique-tractor.com/mailman/listinfo/at

_______________________________________________
AT mailing list
http://www.antique-tractor.com/mailman/listinfo/at