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#4526784 - 09/26/17 02:20 PM Oil filter bypass delete, is it harmful?
Donatello Offline


Registered: 09/25/17
Posts: 15
Loc: Texas
Hey, first post, hi guys I own a 1990 Nissan 300zx of which has oil relief valves located in the block, I removed them because I was told they can be highly problematic on this car's engine, and that if I simply make sure to change my oil and filter regularly I won't have any issues, however recently I've been noticing that my oil pressure isn't as high as it used to be, when first starting the car sometimes there is lifter chatter for about 1-2 seconds and then it goes away, making me think that because I'm not running pressure relief valves, that my OEM oil filter might have gotten an issue and is causing a lower than normal oil pressure situation.

Also something to note is that the oil pressure doesn't go higher than 60 no matter what, whereas about a month ago it would go as high as 90 when revving the engine, looking at the gauge it's like something is restricting flow when the engine wants to start building more pressure, I'm running SuperTech 20w-50 which according to my owners manual is suitable to my summertime climate here in Texas

I've looked at the oil pan and don't see any dents or anything that could restrict flow to the oil pump, nothing has changed visibly other than my oil pressure gauge is reading lower than normal pressure for highway RPMs, but listening to the engine it sounds fine, except for that occasional lifter noise on startup

Could not running pressure relief valves have messed up my oil filter? That combined with running a heavy weight oil and such, could it have done anything to the inside of the filter?

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#4526791 - 09/26/17 02:31 PM Re: Oil filter bypass delete, is it harmful? [Re: Donatello]
i_hate_autofraud Offline


Registered: 05/19/16
Posts: 713
Loc: Canada


The oil relief valve you took off is allowing oil to be dumped back into the pan rather then keep
higher pressure on the oil system leading to bearings and lifters!

If the oil relief valves are known to fail, then have spares, if they fail closed pressure climbs, if it fails
open, oil pressure drops to where you are now.

The oil filter isn't damaged either way, they can handle 250-350 PSI, a level you won't reach.

If you want to do something that makes a difference in oil and engine life, then use FilterMags
on your spin-on oil filter, I've been using a pair for the last 3 yrs or so, clean oil way longer!
Check out the pics in this PDF:

" FILTERMAG vs HOMEBREW "
https://app.box.com/s/uxvu8dmscf5wcgftutdm0ejqwgn86tw7

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#4526846 - 09/26/17 03:40 PM Re: Oil filter bypass delete, is it harmful? [Re: Donatello]
Donatello Offline


Registered: 09/25/17
Posts: 15
Loc: Texas
I took of the oil relief valve and simply plugged the holes in the block, so if all is according to what you said, and I also believe this to be true, then I should have higher oil pressure, which I did for awhile.

I've read a few threads on here where by some people lost oil pressure due to a faulty filter, so that's kind of what got me thinking

The relief valves fail, but sometimes it can end badly, I've seen some people have them get sucked up through the oil pump and cause major damage. A mechanic who specializes in these cars told me when he sees one with bearing issues, at least half of them have issue with the pressure relief valves

That filter mag looks interesting. I run a magnetic drain plug so I'm assuming that is similar?

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#4526853 - 09/26/17 03:51 PM Re: Oil filter bypass delete, is it harmful? [Re: Donatello]
901Memphis Offline


Registered: 08/14/10
Posts: 12897
Loc: Northern Kentucky
Wow I can't believe anyone would do something this terrible to their own car. Your oem fitler doesn't have a bypass built in and you removed the one in the block. If your oil pressure surges you will end up with a blow out in your filter media. The filter can can handle a couple hundred psi but not the media.
_________________________
2012 Chevy Cruze LT 1.4T - 50k
2002 Buick Century 130k - Built 4T65e(Maxlife) - Edge 0w40 + Fram XG3980

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#4527007 - 09/26/17 06:56 PM Re: Oil filter bypass delete, is it harmful? [Re: Donatello]
Donatello Offline


Registered: 09/25/17
Posts: 15
Loc: Texas
I know it sounds like a terrible idea, but this was recommended to me by really good Z mechanic, and I've seen on these particular engines the by-pass valves have issues and lead to an engine dying. I figured worst case scenario I can install a filter with the bypass feature if it's an issue

So maybe I could have blown out the filter media and this could cause lower than normal oil pressure? I was running at many times 90psi of oil pressure before even hitting 5k RPM, but I figured my oil pump would make it so that I wouldn't run oil pressures that are dangerous to my filter

I'm going to change my filter, I have a new oem one in the trunk, guess I'll see what happens, because like I said everything else looks fine, if the oil pressure goes up, I guess I'll start looking for a filter with the bypass feature?

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#4527070 - 09/26/17 08:11 PM Re: Oil filter bypass delete, is it harmful? [Re: Donatello]
clinebarger Offline


Registered: 12/19/13
Posts: 1994
Loc: Fort Worth, Texas
To great of a Pressure differential across the filter media is the worry here.....Not what the burst rating of the filter can is!
_________________________
2001 Chevy Camaro L92/4L80E
2006 Chevy 2500HD LBZ/Allison 1000
2010 Toyota Corolla 2ZR-FE/Auto

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#4527445 - 09/27/17 10:16 AM Re: Oil filter bypass delete, is it harmful? [Re: Donatello]
i_hate_autofraud Offline


Registered: 05/19/16
Posts: 713
Loc: Canada


For the filter media to burst/tear you need a very dirty engine and oil that plugs the filter!

That's actually hard to do with any car /truck built in the last 10 yrs!
In the 70s, 80s, and 90s, I drove various junkers hi miles with hi blow-by
gases into the crankcase, with lots of blowby foam on the oil, but never plugged a filter!

IMHO it's a 1 in a million problem, unless you have a cup of sand in the engine! LOL smile

The sample pics posted here lately of torn filter media all looked like manufacturing defects that got out.

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#4527468 - 09/27/17 10:52 AM Re: Oil filter bypass delete, is it harmful? [Re: Donatello]
Donatello Offline


Registered: 09/25/17
Posts: 15
Loc: Texas
Well I should add that running 20w-50 and having a thermostat (has since been replaced) that wasn't allowing the car to reach operating temp is something that was going on, with the engine cold it was very easy to go from 70psi-90 with a quick rev

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#4528466 - 09/28/17 01:28 PM Re: Oil filter bypass delete, is it harmful? [Re: Donatello]
Donatello Offline


Registered: 09/25/17
Posts: 15
Loc: Texas
UPDATE: So I changed the filter and oil pressure is acting normal again, looks like the filter got messed up by not running bypass valves, time to find an oil filter that has them in the filter I guess, also time to get a new thermostat, if the oil doesn't get to operating temp then it will just have even more pressure than it really should

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#4528489 - 09/28/17 02:03 PM Re: Oil filter bypass delete, is it harmful? [Re: Donatello]
aquariuscsm Offline


Registered: 12/30/06
Posts: 18308
Loc: Dallas,Tx USA
Concerning your oil pressure,these cars are legendary for having the oil pressure sending unit going bad. Mine usually is 100% accurate and then sometimes it'll gradually go to zero then jumping back up again. My Z31 turbo's gauge always sat on 0.
_________________________
1996 Nissan 300ZX 5-speed,Arctic Pearl(#175 of 300)
Quaker State Ultimate Durability 10W30
2012 Honda Accord Coupe EX-L 2.4,auto,San Marino Red
Quaker State Ultimate Durability 5W30


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#4528503 - 09/28/17 02:24 PM Re: Oil filter bypass delete, is it harmful? [Re: Donatello]
Donatello Offline


Registered: 09/25/17
Posts: 15
Loc: Texas
Yeah, that's why I wasn't sure whether to believe oil pressure was an issue, but the gauge combined with lifter tick made me go "hmmm"

also I took a look in the old filter, sure enough the filter media is wrecked, looks horrible, like someone crunched it.

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#4528511 - 09/28/17 02:32 PM Re: Oil filter bypass delete, is it harmful? [Re: Donatello]
aquariuscsm Offline


Registered: 12/30/06
Posts: 18308
Loc: Dallas,Tx USA
What kind've filter was it?
_________________________
1996 Nissan 300ZX 5-speed,Arctic Pearl(#175 of 300)
Quaker State Ultimate Durability 10W30
2012 Honda Accord Coupe EX-L 2.4,auto,San Marino Red
Quaker State Ultimate Durability 5W30


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#4528550 - 09/28/17 03:26 PM Re: Oil filter bypass delete, is it harmful? [Re: Donatello]
Donatello Offline


Registered: 09/25/17
Posts: 15
Loc: Texas
OEM Nissan filter, the big blue one

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#4532607 - 10/03/17 06:10 AM Re: Oil filter bypass delete, is it harmful? [Re: Donatello]
dnewton3 Offline



Registered: 05/14/07
Posts: 7409
Loc: Indianapolis, IN
I'm confused here, because I don't know the details of how that engine is set up.


Typically there are two BP relief valves in an engine.
1) in the filter (or in the block right next to the filter mount). This protects the media from ruptures, and also assures flow should the media blind off
2) in the engine near the pump, to protect the pump from damage due to positive displacement volume concerns. This assures the entire system does not "over pressurize"
(I supposed there could be some amalgamation of the two concepts into one device; not seen that before but conceptually it's possible ...)

So when you removed the "relief valve", was it the one in the block near the filter? That is likely the one to protect the filter. The easy way around that, if that is indeed what you changed out, is to pick a filter similar to OEM specs, but with a BP valve in the filter, that would mimic the OEM feature you removed from the block.

I am not a fan of ever removing any relief valve; they are there for a reason. I would need to understand the specific failure mode of the OEM valves, and why it's become a "thing" to remove them in that niche market.

Do you have any pictures of what you removed? That would help us understand.



NOTE: I'm moving this to the filter forum; it's not "bypass filter" related. I think you confused the BP device topic with BP filtration and put your thread in the wrong area. You'll get more discussion here.


Edited by dnewton3 (10/03/17 06:15 AM)
_________________________
The act of preventative maintenance, in and of itself, is FAR MORE important than brand/grade/base choices among lubes and filters.
- under maintaining something is akin to abuse/neglect; that can kill equipment by shortening the lifespan
- over maintaining something has never been proven to be anything but a waste of time and money

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#4532938 - 10/03/17 11:48 AM Re: Oil filter bypass delete, is it harmful? [Re: Donatello]
ZeeOSix Offline


Registered: 07/22/10
Posts: 17927
Loc: PNW
Originally Posted By: Donatello
Well I should add that running 20w-50 and having a thermostat (has since been replaced) that wasn't allowing the car to reach operating temp is something that was going on, with the engine cold it was very easy to go from 70psi-90 with a quick rev

Originally Posted By: Donatello
Also I took a look in the old filter, sure enough the filter media is wrecked, looks horrible, like someone crunched it.

Cold 20W-50 oil, cold thermostat, high revs and no oil filter bypass valve equals lots of delta-p across the filter, resulting in crushed media like you discovered.

Yes, find a filter that has a bypass valve that fits before you smoke your engine.

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