Go Back   The Ford Barn > General Discussion > Model A (1928-31)

Sponsored Links (Register now to hide all advertisements)

Reply
 
Thread Tools Display Modes
Old 09-14-2020, 04:25 PM   #1
ericr
Senior Member
 
ericr's Avatar
 
Join Date: Apr 2012
Posts: 1,393
Default Wisdom of Stopping Engine by Choking It Out

is this practice harmful to the engine in any way? Sure makes re-starting easier, though.....
ericr is offline   Reply With Quote
Old 09-14-2020, 04:43 PM   #2
GRutter
Senior Member
 
GRutter's Avatar
 
Join Date: Sep 2017
Location: Mint Hill, North Carolina
Posts: 180
Default Re: Wisdom of Stopping Engine by Choking It Out

I can't see where filling the combustion chambers and exhaust with a fuel-rich mixture would be in the best interests of your engine.
GRutter is offline   Reply With Quote
Sponsored Links (Register now to hide all advertisements)
Old 09-14-2020, 04:55 PM   #3
Chuck Sea/Tac
Senior Member
 
Chuck Sea/Tac's Avatar
 
Join Date: May 2010
Location: Between Seattle & Tacoma
Posts: 2,007
Default Re: Wisdom of Stopping Engine by Choking It Out

Sounds like an old wives tale. Wether it would actually wash the cylinders a little, I don’t know, it it makes me cringe just thinking about it.!
Chuck Sea/Tac is offline   Reply With Quote
Old 09-14-2020, 05:04 PM   #4
Ruth
Senior Member
 
Join Date: May 2016
Location: Glide, Oregon
Posts: 658
Default Re: Wisdom of Stopping Engine by Choking It Out

I wouldn't. As mentioned it will wash the oil off of the cylinders. Any excess gas is going to end up in the oil pan, eventually diluting the oil. No not a good idea.
__________________
"Sometimes you really DO need to read the whole thread"
Ruth is offline   Reply With Quote
Old 09-14-2020, 07:44 PM   #5
McMimmcs
Senior Member
 
Join Date: Sep 2019
Location: Pigeon Forge, Tennessee
Posts: 745
Default Re: Wisdom of Stopping Engine by Choking It Out

My mechanic father often said only a novice would do such a foolish trick.
McMimmcs is offline   Reply With Quote
Old 09-14-2020, 08:16 PM   #6
1930-Pickup
Senior Member
 
Join Date: Mar 2017
Location: southern California
Posts: 725
Default Re: Wisdom of Stopping Engine by Choking It Out

Sponsored Links (Register now to hide all advertisements)
With aircraft reciprocating engines, the FAA instructs that the proper way to shut the engine down is to close off the fuel and let the engine run until it stops. There is a good reason for doing it this way.

When you 'choke the engine to death' your introducing too much fuel into the combustion chamber. It washes the oil off the cylinder walls, which increases ring/cylinder wear at the next start up. The extra fuel can also run past the rings and dilute the oil in the crankcase.
__________________
"That's my wild unsubstantiated guess, and I'm sticking to it regardless of the facts!"
1930-Pickup is offline   Reply With Quote
Old 09-14-2020, 08:20 PM   #7
1930-Pickup
Senior Member
 
Join Date: Mar 2017
Location: southern California
Posts: 725
Default Re: Wisdom of Stopping Engine by Choking It Out

Quote:
Originally Posted by McMimmcs View Post
My mechanic father often said only a novice would do such a foolish trick.
Totally agree.
But why did he have to say this often??
Were his kids never listening to him?
__________________
"That's my wild unsubstantiated guess, and I'm sticking to it regardless of the facts!"
1930-Pickup is offline   Reply With Quote
Old 09-14-2020, 09:08 PM   #8
Russ/40
Senior Member
 
Russ/40's Avatar
 
Join Date: May 2010
Location: Santee, California
Posts: 3,301
Default Re: Wisdom of Stopping Engine by Choking It Out

A healthy "A" engine is the easiest engine to start I have ever experienced. Someone, can't remember whow, on this forum once said, "an "A" engine wants to run". That has been my experience. The only time I choke mine is on the first start of the day.
Russ/40 is offline   Reply With Quote
Old 09-14-2020, 09:19 PM   #9
Bill G
Senior Member
 
Bill G's Avatar
 
Join Date: Jun 2017
Location: Walla Walla, WA
Posts: 768
Default Re: Wisdom of Stopping Engine by Choking It Out

Choking would not be good to stop the engine. If you're going to choke, then why not when starting?
__________________
-Bill G
Member of Walla Walla Sweet A's Model A Club
Bill G is offline   Reply With Quote
Old 09-14-2020, 09:34 PM   #10
Chris in WNC
Senior Member
 
Chris in WNC's Avatar
 
Join Date: May 2010
Location: Pineville NC
Posts: 1,131
Default Re: Wisdom of Stopping Engine by Choking It Out

growing up on the farm in the 1950s-60s, we had a 1938 Allis-Chalmers styled WC tractor.
sometime before my memories began, the magneto ground which stopped the engine broke or otherwise went south.
my Grandpa, a pragmatic non-mechanic, simply choked the engine to stop it every time he used it.
that tractor worked hard up into the 1970s and saw limited service into the 80's.
the engine was never taken apart and did not smoke or knock.
last time I saw it, a buyer was driving it home across the fields from Grandpa's estate auction in 1984.
I suppose it's comparing apples to oranges, but evidently choking it didn't do too much damage.
__________________
1931 slant windshield Town Sedan
Chris in WNC is offline   Reply With Quote
Old 09-14-2020, 09:36 PM   #11
McMimmcs
Senior Member
 
Join Date: Sep 2019
Location: Pigeon Forge, Tennessee
Posts: 745
Default Re: Wisdom of Stopping Engine by Choking It Out

Quote:
Originally Posted by 1930-Pickup View Post
Totally agree.
But why did he have to say this often??
Were his kids never listening to him?
He said it often to his customers, not his kids!
McMimmcs is offline   Reply With Quote
Old 09-14-2020, 10:30 PM   #12
ericr
Senior Member
 
ericr's Avatar
 
Join Date: Apr 2012
Posts: 1,393
Default Re: Wisdom of Stopping Engine by Choking It Out

Quote:
Originally Posted by McMimmcs View Post
My mechanic father often said only a novice would do such a foolish trick.
hhmmm....what did he think about turning the ignition off and on while driving to make it backfire?
ericr is offline   Reply With Quote
Old 09-14-2020, 11:31 PM   #13
McMimmcs
Senior Member
 
Join Date: Sep 2019
Location: Pigeon Forge, Tennessee
Posts: 745
Default Re: Wisdom of Stopping Engine by Choking It Out

Quote:
Originally Posted by ericr View Post
hhmmm....what did he think about turning the ignition off and on while driving to make it backfire?
He said only idiots do that!
McMimmcs is offline   Reply With Quote
Old 09-15-2020, 12:06 AM   #14
Chuck Sea/Tac
Senior Member
 
Chuck Sea/Tac's Avatar
 
Join Date: May 2010
Location: Between Seattle & Tacoma
Posts: 2,007
Default Re: Wisdom of Stopping Engine by Choking It Out

Yes, but those idiots were having fun. Assuming they didn’t have to buy the new muffler!
Chuck Sea/Tac is offline   Reply With Quote
Old 09-15-2020, 12:43 AM   #15
Aarongriffey
Senior Member
 
Join Date: Feb 2020
Location: Hayward,CA
Posts: 415
Default Re: Wisdom of Stopping Engine by Choking It Out

I remember back in the day seeing folks rev up their engine real fast and shuting the ignition off. Especially in the winter time.
I remember a guy shutting is tractor off at full throttle when it was belted to a silo filler.
It kept turning over a long time with the silo filler acting as a flywheel.
Aarongriffey is offline   Reply With Quote
Old 09-15-2020, 08:17 AM   #16
McMimmcs
Senior Member
 
Join Date: Sep 2019
Location: Pigeon Forge, Tennessee
Posts: 745
Default Re: Wisdom of Stopping Engine by Choking It Out

[QUOTE=Chuck Sea/Tac;1931750]Yes, but those idiots were having fun. Assuming they didn’t have to buy the new muffler![/QUOTE

They should have had to work for it.

Last edited by McMimmcs; 09-15-2020 at 08:32 AM.
McMimmcs is offline   Reply With Quote
Old 09-15-2020, 08:31 AM   #17
McMimmcs
Senior Member
 
Join Date: Sep 2019
Location: Pigeon Forge, Tennessee
Posts: 745
Default Re: Wisdom of Stopping Engine by Choking It Out

Quote:
Originally Posted by Chuck Sea/Tac View Post
Yes, but those idiots were having fun. Assuming they didnít have to buy the new muffler!
The expense of a new muffler often showed how stupid they really were! Driving the family car was fun, damaging it showed a lack of common sense !
McMimmcs is offline   Reply With Quote
Old 09-15-2020, 11:14 AM   #18
Big hammer
Senior Member
 
Join Date: Jun 2014
Location: Land of Lincoln
Posts: 2,140
Default Re: Wisdom of Stopping Engine by Choking It Out

Quote:
Originally Posted by ericr View Post
is this practice harmful to the engine in any way? Sure makes re-starting easier, though.....
I pull the choke and release it after 2 turn overs and it's running! IMO you might have issues that need you attention if your having problems starting. When my grandsons 1/4 midgets wouldn't start with 1 or2 cranks I would pull the plug and replace it, the old one I then would clean, file the ground flat, gap and it was ready. These engines where Honda 4 hp engined stock, race illegal they put out over 8 hp on a dyno ! Fun times!!
__________________
Don't force it with a little hammer tap, tap, tap
get a bigger hammer tap done
Big hammer is offline   Reply With Quote
Old 09-15-2020, 12:08 PM   #19
Kurt in NJ
Senior Member
 
Kurt in NJ's Avatar
 
Join Date: May 2010
Location: on the Littlefield
Posts: 5,287
Default Re: Wisdom of Stopping Engine by Choking It Out

when starting was with a hand crank loading the cylinders with fuel was prep for starting, hoping it would start on spark----old time lore along with "kicking the tires" which is leftover from clincher rims, kicking them to see that the bead is seated
Kurt in NJ is offline   Reply With Quote
Old 09-15-2020, 03:46 PM   #20
BRENT in 10-uh-C
Senior Member
 
BRENT in 10-uh-C's Avatar
 
Join Date: May 2010
Location: Eastern Tennessee
Posts: 9,601
Default Re: Wisdom of Stopping Engine by Choking It Out

Quote:
Originally Posted by Ruth View Post
I wouldn't. As mentioned it will wash the oil off of the cylinders. Any excess gas is going to end up in the oil pan, eventually diluting the oil. No not a good idea.
Quote:
Originally Posted by Chuck Sea/Tac View Post
Sounds like an old wives tale. Whether it would actually wash the cylinders a little, I donít know, it it makes me cringe just thinking about it.!

Just to muddy up the waters here a bit. Ponder these thoughts for a bit;


.. ~ If gasoline typically evaporates when exposed to heat, what happens when a teaspoon, --or maybe two drips into a gallon of hot oil? Does it evaporate or does it dilute the oil?

.. ~ If it does dilute the oil, how much does it dilute it, -how long does the dilution last, -and what are the effects of this amount of dilution??

.. ~ If it does not evaporate before the engine cools, does it evaporate the next time the engine is at operating temperature? Did it evaporate in one or more cylinders due to a hot piston, or cylinder wall, -or a combustion chamber roof giving off heat just as the engine stopped running?

.. ~ If the gasoline finds its way past the first ring gap, and goes to the second ring gap, -is there enough liquid gasoline left to actually dilute any residual oil on the cylinder walls? If it does dilute the oil as the fuel drips, does it dilute the entire 360į circumference of the cylinder bore, or maybe one small little area?

.. ~ When an engine stops operating due to the ignition source stopping, what happens to the gasoline/air mixture left unburned in each cylinder?

.. ~ When a running engine is stopped, how long does it take before rust starts forming on the cylinder walls and piston rings. What happens to that rust when the engine is restarted?



I guess I view much of this question as we have always been told not to do this because it sounds believable that it would harm something, ...but in the grande scheme of things, I truly believe there is little, -if any, noticeable damage done using the choke to stop an engine from running.



.
.
__________________
.

BRENT in 10-uh-C
.
www.model-a-ford.com
...(...Finally Updated!! )

.
BRENT in 10-uh-C is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Sponsored Links (Register now to hide all advertisements)


All times are GMT -5. The time now is 05:21 AM.