[AT] The way they sound

[Tyler Juranek]

Dean,
That is some interesting information! I've always wondered why the
later A's and 60 sounded a bit different, but still used the same
engine.
Thanks for sharing!
Take Care,
Tyler Juranek
IA

On 8/1/14, Dean VP <deanvp at att.net> wrote:
> Dean,
>
> The duplex carburetor did solve a minor issue that the letter series had and
> that was  since the
> letter series had only a single barrel carburetor one cylinder did not quite
> get the same dose of
> gas/air mixture that the other one did.  Primarily due to the firing
> sequence of the two cylinder
> tractors. The firing sequence is not even on a JD Two Cylinder Engine.  That
> is what gives it such a
> unique sound and why a very heavy flywheel is required on JD Two Cylinder
> engines.  The duplex
> carburetor allowed setting each cylinder for optimum operation.  If I
> remember right the duplex
> carburetor alone added 2 to 3 HP to the same engine that the A had when it
> was used on the 60 with
> duplex carburetion.    An interesting, but not well known, fact is the early
> 50 and 60 "All Fuel"
> tractors stayed with the single barrel carburetor and manifold setup while
> the new 50 & 60 gas
> tractors had the duplex carburetion and manifold setup.  I don't think I
> have ever seen an explanation
> for why JD did it that way by any author. Therefore, I can only speculate
> that JD didn't have the
> engineering/manufacturing resources to make both changers at the same time.
> The duplex carburetion
> set up for "All Fuel" Tractors came much later than the Gas versions.  I
> suppose there may have been
> some doubt at JD whether there would be adequate demand for "All Fuel" 50
> and 60's to justify the cost
> of the conversion.  In either case JD did eventually offer duplex
> carburetion "All Fuel" tractors at a
> later date.
>
> My guess would be that it would take a trained ear at an unusually low idle
> RPM to pick up the
> distinctive sound difference between a single vs Duplex carburetion.  A very
> large part of the
> distinctive sound from a JD Two Cylinder engine comes from the unusual
> firing sequence.  For those of
> us in our more senior years we are just happy to hear anything at all. :-)
>
>
> Dean VP
> Snohomish, WA
>
> They say necessity is the mother of invention.
> Don't know who the father is, probably remorse.
> Red Green
>
> -----Original Message-----
> From: at-bounces at lists.antique-tractor.com
> [mailto:at-bounces at lists.antique-tractor.com] On Behalf Of
> Dean Vinson
> Sent: Friday, August 01, 2014 5:13 AM
> To: 'Antique tractor email discussion group'
> Subject: Re: [AT] The way they sound
>
> Dean VP wrote:
>
>> It is obvious that you are delusional and need to spend more
>>  time on the 620!  :-) Maybe a visit to a Counselor would help!  :-)
>
> Dean, you may be right.  I'll be sure to spend more time on the 620, likely
> beginning today!    Of course, an off-list friend of mine advises me that
> the duplex-carburetion 620 just doesn't have the musical beat of his 1950
> A,
> so perhaps I need to spend time on one of those also.
>
> Ralph Goff wrote:
>
>>  from what little I have heard those Olivers sound plenty smooth
>> too. Of course I am also a bit biased toward the Buda six cylinders
>> in my Cockshutts... https://www.youtube.com/watch?v=BuqkgJUVGKM
>
> Ralph, no argument at all about the Buda sixes, and I've always admired
> Cockshutt and that classic styling of the 20, 30, and 40 series tractors.
> By the way, that's a very nice looking radiator shroud on your 40 in that
> video.  :)
>
> John Hall wrote:
>
>> I think it is time for you to upgrade to a 4020 diesel
>
> John, the 4020 has a permanent spot on my "someday" list, no doubt.  It's
> become a running joke with my fiancee:   Whenever she mentions some chore
> she needs to do, I say something like "That'd be an excellent job for a
> John
> Deere 4020 with the [tulip planting attachment] [steam cleaning attachment]
> [weed-pulling attachment] [etc]."
>
> Dean Vinson
> Saint Paris, Ohio
>
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