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Oil Pressure at Start up
#310718
05/07/09 02:45 AM
05/07/09 02:45 AM
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Joined: Feb 2007
Posts: 6,295
U.S.
moparniac
OP
master
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OP
master
Joined: Feb 2007
Posts: 6,295
U.S.
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Just curious what everyones oil pressure is when first cranking over the motor.... Im sure it varies some but I have Indy heads with stock oiling 440 block and a solid roller. thx 
Mopar Performance
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Re: Oil Pressure at Start up
[Re: moparniac]
#310719
05/07/09 03:41 AM
05/07/09 03:41 AM
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Joined: Jul 2008
Posts: 30,451
Florida STAYcation
dOoC
The village idiot's idiot
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The village idiot's idiot
Joined: Jul 2008
Posts: 30,451
Florida STAYcation
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You should ALWAYS pre-oil a new motor ...and anything that has been shut-down for any long period of time. You can DO SO ...with the new and improved PVC coated(to prevent bushing damage) aluminum or steel 5/16 hex rod. PM for details !  As far as what you will see with the starter spinning the motor over ? ...who knows ? ... lots of variables there.
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Re: Oil Pressure at Start up
[Re: dOoC]
#310720
05/07/09 03:46 AM
05/07/09 03:46 AM
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Joined: Feb 2007
Posts: 6,295
U.S.
moparniac
OP
master
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OP
master
Joined: Feb 2007
Posts: 6,295
U.S.
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Melling Hi Volume pump and its a 66lbs
Mopar Performance
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Re: Oil Pressure at Start up
[Re: moparniac]
#310729
05/07/09 11:22 AM
05/07/09 11:22 AM
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Joined: Dec 2008
Posts: 603
Central Oregon
Rodney
mopar
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mopar
Joined: Dec 2008
Posts: 603
Central Oregon
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80 - 85 with our 572 440-1 Indy heads with Indy .040 restriction fittings, Milodon dual pickup 12 an hose to pump. 15-50 Kendall oil Oil pressure is immediate
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Re: Oil Pressure at Start up
[Re: Thumperdart]
#310731
05/07/09 02:04 PM
05/07/09 02:04 PM
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Joined: Jan 2007
Posts: 3,695
nc
emarine01
master
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master
Joined: Jan 2007
Posts: 3,695
nc
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Quote:
I know a guy that swore you needed to crank the motor till you saw pressure then fire it up........his motor is now apart/broken. A motor can`t build much pressure cranking cos it`s spinning too slow but the minute it lights,pressure jumps right up..... 
 My engine makes 65psi on the starter,I crank for about 15 secs with 65psi then light it off, may be harder on the starter and batts but better than a dry start @ the crank, if I just light it off it is running in a half crank and It hits off hard and fast, the press comes up fast but its still takes a little time to oil everything?
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Re: Oil Pressure at Start up
[Re: emarine01]
#310732
05/07/09 02:08 PM
05/07/09 02:08 PM
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Joined: Jan 2004
Posts: 4,866
North of Detroit
HemiDart68
master
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master
Joined: Jan 2004
Posts: 4,866
North of Detroit
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I don't really see the benefit of cranking an engine with the ignition off to build oil pressure. Its still going to move around the same number of dry revolutions to build oil pressure. My use a preoiler if your concerned, or just start it. I don't see how 30 seconds of cranking to build pressure is any better then starting it for a second to build it.
In God we trust, all others pay cash.
www.lightnens.com (Home of the world's fastest Paint Job)
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Re: Oil Pressure at Start up
[Re: emarine01]
#310735
05/07/09 02:50 PM
05/07/09 02:50 PM
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Joined: Jan 2003
Posts: 32,394
Quicktree
I Win
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I Win
Joined: Jan 2003
Posts: 32,394
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Quote:
My theory is my race engine sits all week with out running so most of the oil film runs off , I only crank up oil press after the engine sits for a while not every time , There is also a difference in cranking compression load and firing load < rough guess 10 to 15 times > so the dry load on the bearing is higher with out cranking, a preoiler is a good thing , oil without any load but dont have one, I have read in some shop manuals for marine engines that sit for extended time to use the compression release or pull the spark plugs and crank to wet out the engine before starting, I know some do and some dont, But my point is that I dont think It is bad to crank up oil pressure with the starter unless some one here thoughts on why not to
do you do that with your daily driver? they set for weeks at times. doesn't dp much to spin it over first. but if it makes you happy do it.
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Re: Oil Pressure at Start up
[Re: Quicktree]
#310737
05/07/09 03:05 PM
05/07/09 03:05 PM
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Joined: Jan 2007
Posts: 3,695
nc
emarine01
master
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master
Joined: Jan 2007
Posts: 3,695
nc
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Quote:
Quote:
My theory is my race engine sits all week with out running so most of the oil film runs off , I only crank up oil press after the engine sits for a while not every time , There is also a difference in cranking compression load and firing load < rough guess 10 to 15 times > so the dry load on the bearing is higher with out cranking, a preoiler is a good thing , oil without any load but dont have one, I have read in some shop manuals for marine engines that sit for extended time to use the compression release or pull the spark plugs and crank to wet out the engine before starting, I know some do and some dont, But my point is that I dont think It is bad to crank up oil pressure with the starter unless some one here thoughts on why not to
do you do that with your daily driver? they set for weeks at times. doesn't dp much to spin it over first. but if it makes you happy do it.
Hey Quik, my daily driver is a different thing, it rarely sits and I dont push it to its max every time I run it,I change my oil every 10 passes , thats 35 to 40 secs under load & I pull the pan every year on my race engine and check things my daily driver gets 3000mile oil and junked if its not up to the task 
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I see, usually, around 75 to 80 lbs with cold oil on start up no matter what rpm it idles or revs to. 75 to 80 lbs is usually the bypass pressure it takes to open the bypass 
