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OIL PRESSURE DROPPING AT HIGHER RPM #1236775 05/21/12 04:08 AM 05/21/12 04:08 AM
Joined: Jun 2011 Posts: 1,039 ALBERTA CANADA C CUDA8U OP super stock
CUDA8U OP super stock C Joined: Jun 2011 Posts: 1,039 ALBERTA CANADA	i noticed my oil pressure start to drop around 3500 rpm and drop rapidly to 25psi on hard accel beyond 3500 stock pan,hv pump not sure what clearance was set on pump/pan

Re: OIL PRESSURE DROPPING AT HIGHER RPM [Re: CUDA8U] #1236776 05/21/12 04:41 AM 05/21/12 04:41 AM
Joined: Feb 2010 Posts: 18,493 Granite Bay CA Kern Dog Striving for excellence
Kern Dog Striving for excellence Joined: Feb 2010 Posts: 18,493 Granite Bay CA	Quote: stock pan,hv pump Pretty simple. Any MORE questions?

Re: OIL PRESSURE DROPPING AT HIGHER RPM [Re: Kern Dog] #1236777 05/21/12 08:26 AM 05/21/12 08:26 AM
A Anonymous Unregistered
Anonymous Unregistered A	Sounds like too much oil in the pan,,it is classic symptom--oil foams up and pressure goes down. Many stock pans are 4 qt and get overfilled or..could be pick up to far from pan bottom would be my guess

Re: OIL PRESSURE DROPPING AT HIGHER RPM [Re: ] #1236778 05/21/12 09:41 AM 05/21/12 09:41 AM
Joined: Jan 2003 Posts: 1,018 Here and now J jeebis44 super stock
jeebis44 super stock J Joined: Jan 2003 Posts: 1,018 Here and now	I had similar symptoms on a stock 318 and it turned out to be a bunch of crap clogging up the oil pickup

Re: OIL PRESSURE DROPPING AT HIGHER RPM [Re: jeebis44] #1236779 05/21/12 10:46 AM 05/21/12 10:46 AM
Joined: Nov 2011 Posts: 2,154 Its a TRAP! DARTH V8Я Oh No!! I just had a moron attack!
DARTH V8Я Oh No!! I just had a moron attack! Joined: Nov 2011 Posts: 2,154 Its a TRAP!	bypass spring in the oil pump getting weak time for a replacement When it takes more than a sweet mullet to prove you rule at the trailer park..

Re: OIL PRESSURE DROPPING AT HIGHER RPM [Re: DARTH V8Я] #1236780 05/21/12 11:02 AM 05/21/12 11:02 AM
Joined: Jan 2003 Posts: 75,092 A Banana Republic near you. JohnRR I Win
JohnRR I Win Joined: Jan 2003 Posts: 75,092 A Banana Republic near you.	He NeVeR sAiD wHaT STOCK pAn He HaS .

Re: OIL PRESSURE DROPPING AT HIGHER RPM [Re: JohnRR] #1236781 05/21/12 03:03 PM 05/21/12 03:03 PM
Joined: Jun 2011 Posts: 1,039 ALBERTA CANADA C CUDA8U OP super stock
CUDA8U OP super stock C Joined: Jun 2011 Posts: 1,039 ALBERTA CANADA	i'm not sure what pan is on the 440,I recently noticed the oil was black and seemed to be about a liter low so I dumped the oil and replaced with 5 liters which brought it up a 1/4" of an inch on the dip stick.The oil pressure dropped at the lower level too. all the way up to 3400 rpm the pressure reads 75psi but as soon as I hit 3500 it begins to drop and if I accellerate it will drop fairly rapidly to 25psi,on de-accel it slowly comes up. The engine even sounds a little noisier until the pressure increases if there's diff. pans for the 440 are they stamped somewhere?

Re: OIL PRESSURE DROPPING AT HIGHER RPM [Re: CUDA8U] #1236782 05/21/12 05:04 PM 05/21/12 05:04 PM
Joined: Jan 2003 Posts: 20,906 A collage of whims topside Too Many Posts
topside Too Many Posts Joined: Jan 2003 Posts: 20,906 A collage of whims	High volume pump could be sucking the pan dry, not enough drainback to maintain the supply. Or it could be the rotating assy is pulling the oil out of the sump, especially if there's no windage tray. The stock windage tray doesn't drain all that well, either.

Re: OIL PRESSURE DROPPING AT HIGHER RPM [Re: topside] #1236783 05/21/12 05:13 PM 05/21/12 05:13 PM
Joined: Apr 2003 Posts: 12,244 Looking for a way out of Middl... IMGTX I Live Here
IMGTX I Live Here Joined: Apr 2003 Posts: 12,244 Looking for a way out of Middl...	Quote: High volume pump could be sucking the pan dry. This effect killed the first 440 I ever built. If your gonna run it hard with a high Volume pump you need a larger volume of oil in the reservoir, i.e. the pan.) Get a bigger capacity pan with baffles and if you do not have it a windage tray.

Re: OIL PRESSURE DROPPING AT HIGHER RPM [Re: CUDA8U] #1236784 05/21/12 05:13 PM 05/21/12 05:13 PM
Joined: Nov 2003 Posts: 36,041 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,041 Lincoln Nebraska	pickup getting uncovered on accell or not enough pickup/pan clearance live every 24 hour block of time like it's your last day on earth

Re: OIL PRESSURE DROPPING AT HIGHER RPM [Re: RapidRobert] #1236785 05/21/12 05:25 PM 05/21/12 05:25 PM
Joined: Jun 2011 Posts: 1,039 ALBERTA CANADA C CUDA8U OP super stock
CUDA8U OP super stock C Joined: Jun 2011 Posts: 1,039 ALBERTA CANADA	how much would i have to lift the engine to remove pan? what would have to be disconnected ? easiest way to measure pan/pump clearance? recommended aftermarket pan? Last edited by CUDA8U; 05/21/12 05:26 PM.

Re: OIL PRESSURE DROPPING AT HIGHER RPM [Re: CUDA8U] #1236786 05/21/12 05:29 PM 05/21/12 05:29 PM
Joined: Nov 2003 Posts: 36,041 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,041 Lincoln Nebraska	Quote: easiest way to measure pan/pump clearance? modeling clay. I'd want 1/8" live every 24 hour block of time like it's your last day on earth

Re: OIL PRESSURE DROPPING AT HIGHER RPM [Re: CUDA8U] #1236787 05/21/12 08:07 PM 05/21/12 08:07 PM
Joined: Feb 2005 Posts: 28,312 Cincinnati, Ohio Challenger 1 Too Many Posts
Challenger 1 Too Many Posts Joined: Feb 2005 Posts: 28,312 Cincinnati, Ohio	Quote: how much would i have to lift the engine to remove pan? what would have to be disconnected ? easiest way to measure pan/pump clearance? recommended aftermarket pan? Hi volume oil pumps do this and have ruined more engines than it helped, people are hard to convince of this though. No need for a HV pump, this is why imo. Makes for a lot of oil control problems, like baffeling and getting wound up around the crank.

Re: OIL PRESSURE DROPPING AT HIGHER RPM [Re: Challenger 1] #1236788 05/21/12 08:28 PM 05/21/12 08:28 PM
Joined: Jun 2011 Posts: 1,039 ALBERTA CANADA C CUDA8U OP super stock
CUDA8U OP super stock C Joined: Jun 2011 Posts: 1,039 ALBERTA CANADA	WOW!! Which advise to take?

Re: OIL PRESSURE DROPPING AT HIGHER RPM [Re: CUDA8U] #1236789 05/21/12 09:36 PM 05/21/12 09:36 PM
Joined: Aug 2003 Posts: 12,291 Kent, Wa 340SHORTY Truck Nut
340SHORTY Truck Nut Joined: Aug 2003 Posts: 12,291 Kent, Wa	"Dump da pump" I am truckless..

Re: OIL PRESSURE DROPPING AT HIGHER RPM [Re: CUDA8U] #1236790 05/21/12 10:05 PM 05/21/12 10:05 PM
Joined: Aug 2004 Posts: 721 Seminole County FL to Plymouth... Barry70GTX super stock
Barry70GTX super stock Joined: Aug 2004 Posts: 721 Seminole County FL to Plymouth...	Quote: WOW!! Which advise to take? Add another quart and see if that takes care of it. The 5 quarts may not be draining back to the sump fast enough. NMCA NSS 67 Coronet

Re: OIL PRESSURE DROPPING AT HIGHER RPM [Re: Barry70GTX] #1236791 05/21/12 11:20 PM 05/21/12 11:20 PM
Joined: Dec 2008 Posts: 2,782 USA J JoesMopar master
JoesMopar master J Joined: Dec 2008 Posts: 2,782 USA	Get rid of the HV pump, overfilling the stock pan doesn't sound like a "fix" to me.

Re: OIL PRESSURE DROPPING AT HIGHER RPM [Re: JoesMopar] #1236792 05/21/12 11:32 PM 05/21/12 11:32 PM
Joined: Sep 2007 Posts: 14,889 up yours Supercuda About to go away
Supercuda About to go away Joined: Sep 2007 Posts: 14,889 up yours	lol The old HV pump myth. I ran a HV pump in my 413, ran it from San Diego to Memphis and back. 75+ mph, 4.10 gears, 28" tall tires. That's about 3700 rpm for HOURS on end, stock pan, MP windage tray. Ran a liquid filled Autometer oil pressure gauge to monitor it. No problems. Try dropping your viscosity, bet your running old school thick oil and hitting the bypass in the pump. 70+ psi is way too much anyway. They say there are no such thing as a stupid question. They say there is always the exception that proves the rule. Don't be the exception.

Re: OIL PRESSURE DROPPING AT HIGHER RPM [Re: Supercuda] #1236793 05/21/12 11:36 PM 05/21/12 11:36 PM
Joined: Feb 2005 Posts: 28,312 Cincinnati, Ohio Challenger 1 Too Many Posts
Challenger 1 Too Many Posts Joined: Feb 2005 Posts: 28,312 Cincinnati, Ohio	Quote: lol The old HV pump myth. I ran a HV pump in my 413, ran it from San Diego to Memphis and back. 75+ mph, 4.10 gears, 28" tall tires. That's about 3700 rpm for HOURS on end, stock pan, MP windage tray. Ran a liquid filled Autometer oil pressure gauge to monitor it. No problems. Try dropping your viscosity, bet your running old school thick oil and hitting the bypass in the pump. 70+ psi is way too much anyway. lol I ran them too for years, but when I quit using them my engines were better and lasted longer without the additional stress on the drive and less windage, from my experience.

Re: OIL PRESSURE DROPPING AT HIGHER RPM [Re: Challenger 1] #1236794 05/21/12 11:48 PM 05/21/12 11:48 PM
Joined: Dec 2008 Posts: 2,782 USA J JoesMopar master
JoesMopar master J Joined: Dec 2008 Posts: 2,782 USA	Had this problem on my 383, changed back to the stock pump with no other changes and it cured my oil pressure problems. Not sure what the myth is, high volume means it moves more oil....right?

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