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Re: OIL PRESSURE DROPPING AT HIGHER RPM
[Re: Cab_Burge]
#1236798
05/22/12 01:15 AM
05/22/12 01:15 AM
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Joined: Jun 2011
Posts: 1,039
ALBERTA CANADA
CUDA8U
OP
super stock
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OP
super stock
Joined: Jun 2011
Posts: 1,039
ALBERTA CANADA
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Quote:
Quote:
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
Which motor and body style are you having the problems with?  
body style?
440, stock pan , hv pump
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Re: OIL PRESSURE DROPPING AT HIGHER RPM
[Re: CUDA8U]
#1236799
05/22/12 03:17 AM
05/22/12 03:17 AM
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Joined: Aug 2003
Posts: 43,223
Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,223
Bend,OR USA
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Quote:
Quote:
Quote:
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
Which motor and body style are you having the problems with?
body style?
440, stock pan , hv pump
What year 440 motor and what year and body style is the car, last thing, does the oil pan have a number stamped in it on the bottom side? If so what number is it? If no numbers can you take a picture of it( the oil pan) and add it on here on your next post? I hope so   No oil or low oil pressure can be very damaging to your motor, don't ask me how I know that  I have a box of broken parts from racing them Mopar V8, BB, SB and 426 Hemi motors  
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: OIL PRESSURE DROPPING AT HIGHER RPM
[Re: jcastle1]
#1236800
05/22/12 08:16 AM
05/22/12 08:16 AM
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Joined: Feb 2005
Posts: 28,312
Cincinnati, Ohio
Challenger 1
Too Many Posts
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Too Many Posts
Joined: Feb 2005
Posts: 28,312
Cincinnati, Ohio
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Quote:
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.
What does that mean "my engines were better"how do you know they "lasted longer" because of the oil pump?How did you monitor it to decide this?
Were all other things like tune-up,oil quality,oil filter,oil brand,oil type,type of driving equal?
Why did you decide to "stop using them"?What does "less windage" mean?
I'm confused.
John
Ever twisted a drive? You learn lot's at the track that you will never learn on the street.
I have built 4 BBC for my dragsters and would have lot's of oil in my catch tank at the end of the run with a HV oil pump. Warren Gross who helped me build my first BB suggested that I don't use it back around 1992. So I did build 3 more BB with standard pumps and there was lot's less oil in my catch tank after each run. I also would look down at the end of the run to see hardly any oil pressure with HV pumps(even with huge dragster oil pans), I had way more pressure at the end of a run with a standard pump. This was after bracing the stock pump to kkep from cracking it off the rear main cap which happened twice to me before I braced my pumps on BBC. Then I went with external belt driven pump which was even better with big strock cranks.
Since then I have built 3-340s 2 440s, a couple of diesel engines, and some motorcycle engines. Not to mention many BAE hemis.
Does that help any?
I drove my latest 340 at Bonneville at near wide open throttle for over 5 miles at a time with a standard oil pump and it held up fine in 95 degree weather, twice that day with no oil pressure problems. That's a serious workout at wide open throttle for miles at a time.
Almost 5 minutes later at 120 mph. Wonder how many cars and motors out there would stand up to this kind of use?
Last edited by Challenger 1; 05/22/12 03:55 PM.
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Re: OIL PRESSURE DROPPING AT HIGHER RPM
[Re: Barry70GTX]
#1236803
05/22/12 09:09 AM
05/22/12 09:09 AM
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Joined: Oct 2003
Posts: 21,345
Marysville, O-H-I-O
70Cuda383
Too Many Posts
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Too Many Posts
Joined: Oct 2003
Posts: 21,345
Marysville, O-H-I-O
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I don't think oil volume is the problem. it's either the pump, or something is plugging the pickup/filter.
he's putting in 5 LITERS of oil, that's more than 5 quarts.
**Photobucket sucks**
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Re: OIL PRESSURE DROPPING AT HIGHER RPM
[Re: Challenger 1]
#1236806
05/22/12 12:24 PM
05/22/12 12:24 PM
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Joined: Jan 2003
Posts: 5,875
communist bloc of new jersey
jamesc
master
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master
Joined: Jan 2003
Posts: 5,875
communist bloc of new jersey
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Quote:
The old HV pump myth.
two identical engines, same oil, same temperature one with a HV pump, one with a standard pump. both at 3000 rpm, both with 70# oil pressure. guess which one has more oil flowing through the engine? NEITHER
the ONLY time a HV pump is pumping more oil through the engine is if the pressure is higher...period
put on a stock pump with an 80# relief spring in it, it makes 80# of OP, then put a HV pump with a 60# spring on it and it makes 60# of OP, guess which one is pumping more oil THROUGH the engine THE STOCK PUMP
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Re: OIL PRESSURE DROPPING AT HIGHER RPM
[Re: Paul_Fancsali]
#1236810
05/23/12 12:06 AM
05/23/12 12:06 AM
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Joined: Jun 2011
Posts: 1,039
ALBERTA CANADA
CUDA8U
OP
super stock
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OP
super stock
Joined: Jun 2011
Posts: 1,039
ALBERTA CANADA
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Quote:
Fully agree with not running a HV pump stock pan is being sucked dry if its a good pump. As long as you got at least 25 lbs at speed no harm done yet!
definately a noisier engine with the pressure drop
surely someone has had a stock pan and hv pump with this problem before,I guess i'll try the stock pump but don't want to sink a pile of money into this engine since I'm planning a 493 stroker kit for this engine this winter which brings another whole set of questions
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Re: OIL PRESSURE DROPPING AT HIGHER RPM
[Re: CUDA8U]
#1236811
05/23/12 12:09 AM
05/23/12 12:09 AM
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Joined: Dec 2008
Posts: 2,782
USA
JoesMopar
master
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master
Joined: Dec 2008
Posts: 2,782
USA
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Quote:
surely someone has had a stock pan and hv pump with this problem before,
Yeah.....that was me... 
383, stock 4 quart pan, windage tray, HV pump, 440 Source Heads. The drainback sucked.
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Re: OIL PRESSURE DROPPING AT HIGHER RPM
[Re: JoesMopar]
#1236812
05/23/12 12:12 AM
05/23/12 12:12 AM
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Joined: Jan 2003
Posts: 5,875
communist bloc of new jersey
jamesc
master
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master
Joined: Jan 2003
Posts: 5,875
communist bloc of new jersey
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Quote:
Volume and pressure are two totally different things
they may be totally different things but they are directly related. all else being equal the only way to increase oil flow through an engine is to increase the oil pressure. if the stock pump makes the same oil pressure as the HV pump then the flow through the engine is identical and the HV pump has absolutely nothing to do with "sucking the pan dry" as so many people seem to think.
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Re: OIL PRESSURE DROPPING AT HIGHER RPM
[Re: jamesc]
#1236813
05/23/12 12:19 AM
05/23/12 12:19 AM
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Joined: Oct 2003
Posts: 3,698
NE Oklahoma
Von
master
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master
Joined: Oct 2003
Posts: 3,698
NE Oklahoma
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Im sure you are sucking the pan dry....
My first 440 w/high pressure pump and a hv pump would suck the stock pan dry...
Did it too many times to count....never spun a bearing...but the bearings looked horrible when I tore it down. But, the bearings were shot well before I started sucking her dry....
72 RR, Pump gas 440, 452s, 3800 lbs, Corked, ET Radials,. 11.33@117.72.
Same car, bone stock 346s, 9.5 comp, baby solid. 12.24@110.
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Re: OIL PRESSURE DROPPING AT HIGHER RPM
[Re: JoesMopar]
#1236814
05/23/12 12:25 AM
05/23/12 12:25 AM
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Joined: Jun 2011
Posts: 1,039
ALBERTA CANADA
CUDA8U
OP
super stock
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OP
super stock
Joined: Jun 2011
Posts: 1,039
ALBERTA CANADA
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Quote:
Quote:
surely someone has had a stock pan and hv pump with this problem before,
Yeah.....that was me...
383, stock 4 quart pan, windage tray, HV pump, 440 Source Heads. The drainback sucked.
so what solved the problem for you?
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