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| Oil pressure drops while revving up motor (Page 2/2) |
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theogre
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OCT 11, 04:26 AM
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| quote | Originally posted by 82-T/A [At Work]:
Another option is a windage tray and a new oil high-volume oil pump to make up for the loss of pressure from the enlarged clearances. |
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Often that doesn't help.
Factory oil passages have many issues and adding High Volume/Pressure pumps often doesn't = to crank and other bearings getting more oil. Often only show on gauges making a bogus case for rest of engine will get more oil. Worse many HV pumps can "Peg" the regulator open because of OE oil plumbing and see high pressure that can "peg" the OE gauge and cause problems w/ many brand of filters.
Lets say you have a filter case that handles high volume/pressure w/o problems... Filter Media can have problems of it's own and if media fails and plugs up then you hope Filter Bypass in many GM engine not just Fiero dukes and V6 flows enough oil to save the motor. Even w/ that then engine is functionally running w/o a filter and that can plug up many things and often fast too.
Every engine that uses PF47 52 and related have no bypass in them. Is In the Engine w/ most are in the Filter Mount area. Many use ACDelco PN 25014006 including many Current Gas and Diesel engines. Currently 2265 Total number of applications. https://parts-catalog.acdel...=5561&parttype=10662
(Newer bypasses may have a very small "filter" but isn't like using the main filter for several reasons.)
Heavy oils can have same problem and bypassing the filter. Worse when weather is cold because Media can't flow oil turn to grease.[This message has been edited by theogre (edited 10-11-2019).]
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Will
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OCT 11, 04:00 PM
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| quote | Originally posted by 82-T/A [At Work]:
Another option is a windage tray and a new oil high-volume oil pump to make up for the loss of pressure from the enlarged clearances. |
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| quote | Originally posted by theogre:Often that doesn't help.
Factory oil passages have many issues and adding High Volume/Pressure pumps often doesn't = to crank and other bearings getting more oil. Often only show on gauges making a bogus case for rest of engine will get more oil. Worse many HV pumps can "Peg" the regulator open because of OE oil plumbing and see high pressure that can "peg" the OE gauge and cause problems w/ many brand of filters.
Lets say you have a filter case that handles high volume/pressure w/o problems... Filter Media can have problems of it's own and if media fails and plugs up then you hope Filter Bypass in many GM engine not just Fiero dukes and V6 flows enough oil to save the motor. Even w/ that then engine is functionally running w/o a filter and that can plug up many things and often fast too.
Every engine that uses PF47 52 and related have no bypass in them. Is In the Engine w/ most are in the Filter Mount area. Many use ACDelco PN 25014006 including many Current Gas and Diesel engines. Currently 2265 Total number of applications. https://parts-catalog.acdel...=5561&parttype=10662
(Newer bypasses may have a very small "filter" but isn't like using the main filter for several reasons.)
Heavy oils can have same problem and bypassing the filter. Worse when weather is cold because Media can't flow oil turn to grease.
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On two occasions I've used a high volume pump with the original regulator spring to help engines which were worn enough to light the low oil pressure light during heat soaked idle in traffic. On both units, the extra volume kept the oil pressure at heat soaked idle high enough to prevent the low oil pressure light from lighting. Both went on to drive many thousands more miles.[This message has been edited by Will (edited 10-11-2019).]
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82-T/A [At Work]
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OCT 12, 02:58 AM
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| quote | Originally posted by theogre:
Often that doesn't help.
Factory oil passages have many issues and adding High Volume/Pressure pumps often doesn't = to crank and other bearings getting more oil. Often only show on gauges making a bogus case for rest of engine will get more oil. Worse many HV pumps can "Peg" the regulator open because of OE oil plumbing and see high pressure that can "peg" the OE gauge and cause problems w/ many brand of filters.
Lets say you have a filter case that handles high volume/pressure w/o problems... Filter Media can have problems of it's own and if media fails and plugs up then you hope Filter Bypass in many GM engine not just Fiero dukes and V6 flows enough oil to save the motor. Even w/ that then engine is functionally running w/o a filter and that can plug up many things and often fast too.
Every engine that uses PF47 52 and related have no bypass in them. Is In the Engine w/ most are in the Filter Mount area. Many use ACDelco PN 25014006 including many Current Gas and Diesel engines. Currently 2265 Total number of applications. https://parts-catalog.acdel...=5561&parttype=10662
(Newer bypasses may have a very small "filter" but isn't like using the main filter for several reasons.)
Heavy oils can have same problem and bypassing the filter. Worse when weather is cold because Media can't flow oil turn to grease.
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I agree with you Ogre... I see it more though as a temporary fix until such point that the owner does a full engine rebuild. It's kind of like a bottle of Bar's Engine Fix... which I've never used, so we're clear! Hah...
The increased oil pressure is enough at least to get oil to where it needs to go to keep oil pressure in the lifters so the car doesn't get valve rattle. Basically... to keep the car running ~10k more miles where it would probably have died before then.
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David Riedle
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OCT 12, 11:43 AM
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I have used Amzoil Engine and Transmission Flush (FLSHCN-EA) with great success. You pour it in, idle for 10 minutes, and flush it.
Personally, I would then run Royal Purple Duralec 15W40 motor oil for 2,000 miles. I would then drain it, and put in whatever motor oil you normally use.
Synthetic motor oil is one of the best ways to clean an engine oil out. The RP Duralec oil is a professional-grade diesel motor oil that has a higher detergent concentration than regular synthetics, and since it is a 15W40 oil, it has a higher viscosity, which should help with the oil pressure. The synthetic oil will give you more protection than Dino oil, so it should not contribute to the problems...
If, after changing it, and use a known-good mechanical gauge, the problem still exists, you have mechanical issues.
This is my two-cents worth of advise, (which is probably not worth two-cents...)
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Will
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OCT 28, 10:09 AM
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| quote | Originally posted by David Riedle:
This is my two-cents worth of advise, (which is probably not worth two-cents...) |
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It was free, after all... 
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