Home » Public Forums » GMCnet » [GMCnet] Best Cold Start Procedure For Carb 455/403???
| [GMCnet] Best Cold Start Procedure For Carb 455/403??? [message #75629] |
Thu, 04 March 2010 09:50  |
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Jim White[1]
Messages: 144
Registered: September 2008
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While I like to start and run my engine for at least 30 minutes every
couple of weeks while in winter storage, it has been basically snowbound
since early January. While we had great fun after viewing the "redneck
cold starting procedure" on YouTube, can we do better? Let's see if we
can define a best practices type procedure for performing a cold start
after months of storage. There definitely some "Don't do this steps,
like attaching jumper cables to the starting battery with the car
running, what would constitute the best procedure to avoid any damage?
Step 1=?
Step 2=?
TIA for contributing. I may develop an short article from your responses.
This thread might save owners lots of grief.....and $$$.
Doc
Wintergreen, Va
75 GMC Stretch
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| Re: [GMCnet] Best Cold Start Procedure For Carb 455/403??? [message #75633 is a reply to message #75630] |
Thu, 04 March 2010 10:11  |
C Boyd
Messages: 2629
Registered: April 2006
Karma: 18
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| Ken Burton wrote on Thu, 04 March 2010 11:02 |
1. If you have a prime switch turn it on for 10 seconds and back off again.
2. Step on the gas to the floor once and release to set the choke and fast idle cam.
3. Turn the key to start.
You are done
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Jim: if you don`t have an electric pump..... remove air cleaner and use a small plastic bottle and fill the carb bowl with gas thru the vent tube. Then mash gas pedal to floor twice gently to set choke and prime then start.
C. Boyd
76 Crestmont
East Tennessee
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| Re: [GMCnet] Best Cold Start Procedure For Carb 455/403??? [message #75635 is a reply to message #75629] |
Thu, 04 March 2010 10:21 |
Rick Denney
Messages: 430
Registered: January 2004
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Jim wrote...
> While I like to start and run my engine for at least 30
> minutes every
> couple of weeks while in winter storage, it has been
> basically snowbound
> since early January.
Might not need or want to run it every two weeks. That allows
acids to build up in the oil, and sitting their idling
doesn't really boil them off. If you start it in the winter,
be prepared to drive it. That's advice from Dick P, as I
heard it.
> what would constitute the best procedure to avoid
> any damage?
> Step 1=?
> Step 2=?
>
The standard procedure is:
1. Press the gas pedal to the floor once or twice. This sets
the choke and the high idle, and supposedly squirts a little
raw fuel into the intake.
2. With your foot OFF the pedal, crank the engine until it
starts.
3. At intervals of half a minute or so, gun the engine
slightly to release the high-idle and choke mechanism to find
its new level, based on the progress of the warmup.
This method assumes there is some fuel in the float bowl,
which there isn't always. Priming with an electric pump will
put some fuel in the float bowl.
But I add a step at the start: Before turning on the fuel
pump, and without touching the gas pedal, I crank the engine
until I get oil pressure (as measured on my mechanical
gauge). Then, I turn on the fuel pump and follow the above
procedure. Powering the fuel pump through an oil-pressure
switch enforces this approach automatically--the fuel pump
won't turn on until there is oil pressure. In that case,
crank until the oil fuel pump comes on, stop cranking, press
the gas pedal a couple of times, and then crank the engine to
start it.
With a mechanical pump, the modified procedure would be to
avoid touching the gas pedal, and crank for 20 seconds or
until you get an oil pressure reading, and then stop
cranking. Then, follow the above steps.
The steps in the book are really intended for daily drivers,
not engines that need some oil distribution before being run
up to a coupla thousand RPMs, it seems to me. The extra step
to build oil pressure is probably not needed for engines that
have been run in the previous two or three days.
Rick "oil first, then gas" Denney
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| Re: [GMCnet] Best Cold Start Procedure For Carb 455/403??? [message #75638 is a reply to message #75635] |
Thu, 04 March 2010 10:42 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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| Rick Denney wrote on Thu, 04 March 2010 10:21 |
Jim wrote...
> While I like to start and run my engine for at least 30
> minutes every
> couple of weeks while in winter storage, it has been
> basically snowbound
> since early January.
Might not need or want to run it every two weeks. That allows
acids to build up in the oil, and sitting their idling
doesn't really boil them off. If you start it in the winter,
be prepared to drive it. That's advice from Dick P, as I
heard it.
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It also dumps a lot of moisture / water in the exhaust system. The exhaust system never gets hot enough to boil it off. The water promotes rusting of the entire exhaust system.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: [GMCnet] Best Cold Start Procedure For Carb 455/403??? [message #75655 is a reply to message #75635] |
Thu, 04 March 2010 14:31 |
Larry
Messages: 2875
Registered: January 2004
Location: Menomonie, WI
Karma: 10
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Senior Member |
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| Rick Denney wrote on Thu, 04 March 2010 10:21 |
Jim wrote...
Might not need or want to run it every two weeks. That allows
acids to build up in the oil, and sitting their idling
doesn't really boil them off. If you start it in the winter,
be prepared to drive it. That's advice from Dick P, as I
heard it.
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I'm with Rick on this. Most oils will stay on the walls for up to a year or so. After that gravity continues its relentless process of pulling oil off of everything. So...IMO...If it is just short term storage...like over the winter...DO NOT start it until you are ready to take it out of storage. As for longer term storage...like over a year...You should start it once per year, but be prepared to drive it at highway speeds for a half hour or so to boil off any products of combustion that may have made its way into the crankcase. This will also circulate oil in the Trans and FD, giving everything a good bath. In addition, I have found that a common butter tub (the small variety) fits perfectly over the end of a 3" exhaust pipe. I usually place it over the end of the pipe to keep moisture from traveling up the pipe and through any open exhaust valves, and keeps out critters like mice from building nests in there. (don't ask me how I figured that out) If I forget to remove it, just the act of starting the motor will blow it off. If you are going to long-term store it for an indefinite period of time with nobody to start it for you, pull the plugs and squirt several tablespoons of clean ATF into the cylinders and turn it over with the plugs out. Put the plugs back in and leave it. I've found that ATF is pretty tenacious stuff and will stick for a long time. This is all just my relatively informed, off the cuff, back yard mecahnic, gut level, eyeball it up and guestimate, opinion....that's all...
Larry 
78 Royale w/500 Caddy
Menomonie, WI.
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| Re: [GMCnet] Best Cold Start Procedure For Carb 455/403??? [message #75670 is a reply to message #75629] |
Thu, 04 March 2010 16:55 |
Gerald Wheeler
Messages: 152
Registered: February 2004
Karma: 0
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Senior Member |
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My new Dick Paterson engine sat unstarted for 2 years; Dick told me to pull
the plugs and coil wire and roll the engine over with the starter for at
least 5 minutes to circulate the oil; pausing every minute to let the
starter cool.
JR Wheeler 78 Royale NC/OR
jrwheeler7@earthlink.net
> [Original Message]
> From: Larry <weidnerl@wwt.net>
> To: <gmclist@temp.gmcnet.org>
> Date: 3/4/2010 3:32:11 PM
> Subject: Re: [GMCnet] Best Cold Start Procedure For Carb 455/403???
>
>
>
> Rick Denney wrote on Thu, 04 March 2010 10:21
> > Jim wrote...
> >
> > Might not need or want to run it every two weeks. That allows
> > acids to build up in the oil, and sitting their idling
> > doesn't really boil them off. If you start it in the winter,
> > be prepared to drive it. That's advice from Dick P, as I
> > heard it.
>
> I'm with Rick on this. Most oils will stay on the walls for up to a year
or so. After that gravity continues its relentless process of pulling oil
off of everything. So...IMO...If it is just short term storage...like over
the winter...DO NOT start it until you are ready to take it out of storage.
As for longer term storage...like over a year...You should start it once
per year, but be prepared to drive it at highway speeds for a half hour or
so to boil off any products of combustion that may have made its way into
the crankcase. This will also circulate oil in the Trans and FD, giving
everything a good bath. In addition, I have found that a common butter tub
(the small variety) fits perfectly over the end of a 3" exhaust pipe. I
usually place it over the end of the pipe to keep moisture from traveling
up the pipe and through any open exhaust valves, and keeps out critters
like mice from building nests in there. (don't ask me how I figured that
out) If I forget to remove
> it, just the act of starting the motor will blow it off. If you are
going to long-term store it for an indefinite period of time with nobody to
start it for you, pull the plugs and squirt several tablespoons of clean
ATF into the cylinders and turn it over with the plugs out. Put the plugs
back in and leave it. I've found that ATF is pretty tenacious stuff and
will stick for a long time. This is all just my relatively informed, off
the cuff, back yard mecahnic, gut level, eyeball it up and guestimate,
opinion....that's all...
> --
> Larry :)
> 78 Royale w/500 Caddy
> Menomonie, WI.
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| Re: [GMCnet] Best Cold Start Procedure For Carb 455/403??? [message #75678 is a reply to message #75629] |
Thu, 04 March 2010 17:49 |
Steven Ferguson
Messages: 3447
Registered: May 2006
Karma: 0
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Senior Member |
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I don't have the answer for you but I do live by Dick Patterson's rule
of not starting it up until you want to use it, no matter what the
down time is. His opinion is that it does much more harm than good to
periodically start the engine and not drive it until it is heat
soaked.
On Thu, Mar 4, 2010 at 8:50 AM, Jim White <jameswwhite@cyberwind.net> wrote:
> While I like to start and run my engine for at least 30 minutes every
> couple of weeks while in winter storage, it has been basically snowbound
> since early January. While we had great fun after viewing the "redneck
> cold starting procedure" on YouTube, can we do better? Let's see if we
> can define a best practices type procedure for performing a cold start
> after months of storage. There definitely some "Don't do this steps,
> like attaching jumper cables to the starting battery with the car
> running, what would constitute the best procedure to avoid any damage?
> Step 1=?
> Step 2=?
>
> TIA for contributing. I may develop an short article from your responses.
> This thread might save owners lots of grief.....and $$$.
> Doc
> Wintergreen, Va
> 75 GMC Stretch
>
>
> _______________________________________________
> GMCnet mailing list
> List Information and Subscription Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
--
Steve Ferguson
'76 EII
Sierra Vista, AZ
Urethane bushing source
www.bdub.net/ferguson/
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