[AT] More engine issues

Charlie V 1cdevill at gmail.com
Thu Jul 14 08:47:50 PDT 2011


Ben that is more or less true.  That's why you have a choke.  You need a
rich mixture for cold starts and then a leaner mixture to run.  The idea is
to get the mix right for normal operation and use the choke to get it
started and up to temp.

I once owned a 1930 Model A ford pickup.  The choke was on the far
right side of the cab, just ahead of the passenger door as the carb
was on the right side of the engine.  The cab was narrow enough to
allow the choke to be reached by the driver. (that was a good setup if
you were taking your girlfriend for a ride) The choke had a round knob
on the end about the size of a quarter dollar.  Aside from pulling the
choke for starting, it could also be rotated counter-clockwise for a
richer mixture during warm up so it was actually a choke rod plus a
mixture adjustment screw.  Anyone else antique enough to remember
that?

Charlie V.

On Thu, Jul 14, 2011 at 10:40 AM, charlie hill
<charliehill at embarqmail.com> wrote:
> Ben that is more or less true.  That's why you have a choke.  You need a
> rich mixture for cold starts and then a leaner mixture to run.  The idea is
> to get the mix right for normal operation and use the choke to get it
> started and up to temp.
>
> Charlie
>
> -----Original Message-----
> From: Ben Wagner
> Sent: Thursday, July 14, 2011 10:00 AM
> To: Antique tractor email discussion group
> Subject: Re: [AT] More engine issues
>
> I'll let you know what happens; it'll be later tonight since I'm running to
> town this afternoon.  I was looking up my problem yesterday afternoon, and I
> pulled up this quote:
>
> "A motor that runs good cold [ without the choke ] is not going to run good
> hot. A cold motor needs lots of gas droplets in the combustion chamber so
> that the individual gas droplets burn somewhat consecutively and the motor
> runs somewhat smoothly. Once the motor gets hot the gas in the combustion
> chamber flashes to vapor and burns very well unless you have too much then
> it misfires."
>
> I haven't heard anything like this before mentioning the choke.  Is this a
> true statement?   I can't find much else backing it up.
>
> Ben Wagner
>
> On Thu, Jul 14, 2011 at 9:07 AM, Dan Glass <dglass at numail.org> wrote:
>
>> Good luck, let us know how it works out.  I will be interested to hear.
>>
>> On 7/14/2011 8:12 AM, Ben Wagner wrote:
>> > Thanks to everyone for their input.   I'll certainly try the D21 spark
>> > plugs, since I do have Autolite plugs in the tractor right now.  Like
>> > you
>> > said, it's cheap enough to try.
>> >
>> > I was leaning towards a fuel line/carb issue, except that I have just
>> > recently rebuilt the carb.  I may try a good cleaning today, with new
>> spark
>> > plugs, and see what happens.
>> >
>> > Ben Wagner
>> >
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