Jump to content
SAU Community

Engine / Oil Pressure High Before Engine Warms Up!

Spunky Munky
 Share

Recommended Posts

Spunky Munky Grand Master

Spunky Munky

Posted
Posted

Hey fellas,

Just I'll share this with everyone... of late, I've noticed my engine/oil temperature guage hits the higher end when the engine isn't fully warmed up yet... however, after the engine has in fact warmed up; the engine/oil temperature goes down to mid-range again as normal - can someone please tell me if this is normal or is something wrong... I checked my coolant and it's full no leakage etc.

Cheers,

R34GTFOUR Mentor

R34GTFOUR

Posted
Posted
Hey fellas,

Just I'll share this with everyone... of late, I've noticed my engine/oil temperature guage hits the higher end when the engine isn't fully warmed up yet... however, after the engine has in fact warmed up; the engine/oil temperature goes down to mid-range again as normal - can someone please tell me if this is normal or is something wrong... I checked my coolant and it's full no leakage etc.

Cheers,

To put simply oil is thicker when its cold, and as it warms up it becomes thinner. Thinner fluid = less resistence = less pressure.

It is completely normal and everycar will do it.

Abit off topic but, why did you check your coolant if you were worried about oil pressure???

Spunky Munky Grand Master

Spunky Munky

Posted
  • Author
Posted

Hey fellas, thanks for your replies... glad to hear it's normal.

R34GTFOUR - your question is valid; I checked my coolant thinking that there's something wrong with the engine hence making it overheat and therefore perhaps increasing the pressure of the oil etc - worth a check, I guess.

That's good to know... many thanks everyone.

Regards,

PlasticStan Enthusiast

PlasticStan

Posted
Posted
Hey fellas,

Just I'll share this with everyone... of late, I've noticed my engine/oil temperature guage hits the higher end when the engine isn't fully warmed up yet... however, after the engine has in fact warmed up; the engine/oil temperature goes down to mid-range again as normal - can someone please tell me if this is normal or is something wrong... I checked my coolant and it's full no leakage etc.

Cheers,

If the oil is cold how can it be hot???? Unless when you say temperature gauge, you mean pressure gauge?

Spunky Munky Grand Master

Spunky Munky

Posted
  • Author
Posted
If the oil is cold how can it be hot???? Unless when you say temperature gauge, you mean pressure gauge?

Hey mate, I don't know what it's called to be honest - you know, the gauage on the far right corner... has a picture of a oil can or something... always thought it was the engine / oil tempature gauage.

LiQuid IcE Experienced

LiQuid IcE

Posted
Posted

on a related topic...

after the car warms up, is it ok for the pressure to slighty fluctuate up and down onthat guage when on the throttle?

I'm trying a different oil this time and noticed that it rises with the throttle slightly (guessing the oil is thinner?)

The oil level is fine according to the dip stick

Using motul turboight this time, Ddnt use to happen when i used mobile1 which was thinner :S

bluey33 Experienced

bluey33

Posted
Posted

The pressure should go up and down with revs...

For example...

idle. 1st dash...

3000rpm. half way

5000rpm. 3/4 of the way up...

As the engine is revving the oil pressure is rising.

tridentt150v Grand Master

tridentt150v

Posted
Posted

What I meant was that when your oil is cold, it is thick, it takes a lot more effort to push it through the journals and oilways, and until the oil warms up the pressure reading is higher up to 7kg/cm2 [this also depends on the type of oil and its viscosity rating]. Once the oil warms up, it thins out to its specified viscosity and your oil pressure gauge starts reading 3.5-4.0kg. inversely on a stinking hot day your oil pressure can drop to 3.0-3.5 especially if your oil is old or needs changing.

Spunky Munky Grand Master

Spunky Munky

Posted
  • Author
Posted

I guess we've cleared it up pretty good fealls... I just to get worried too - as the pressure gauage used to flucate quite often. Guess it's normal... and I use Mobil1 in my car too.

Also noticed, if you increase the boost - the higher the boost, the more the pressure rises.

tridentt150v Grand Master

tridentt150v

Posted
Posted
Also noticed, if you increase the boost - the higher the boost, the more the pressure rises.

Boost has nothing to do with oil pressure. Revs can change pressure. Your oil pump is mechanically driven, it is linked to the motor. So the more the motor revs, the more your oil pump spins, the greater the pressure. This is counterbalanced by the volume your pump can physically supply. It gets to a certain rev limit and no matter how hard it spins or increases revs, it physically cannot pump any more oil, it has reached its maximum flow rate. The maximum flow rate is also affected by the type of oil, the gallery and journal/bearing size, and the scavenge supply [if you flood the head and starve the bottom end supply].

Spunky Munky Grand Master

Spunky Munky

Posted
  • Author
Posted
Boost has nothing to do with oil pressure. Revs can change pressure. Your oil pump is mechanically driven, it is linked to the motor. So the more the motor revs, the more your oil pump spins, the greater the pressure. This is counterbalanced by the volume your pump can physically supply. It gets to a certain rev limit and no matter how hard it spins or increases revs, it physically cannot pump any more oil, it has reached its maximum flow rate. The maximum flow rate is also affected by the type of oil, the gallery and journal/bearing size, and the scavenge supply [if you flood the head and starve the bottom end supply].

Thanks for the extra information buddy - you've explained this well and in a way that is easy to understand - thank you mate!!

Regards,

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing


  • Similar Content

  • Latest Posts

    • Rezz
      DeAgostini 1/8 scale BNR32 Nissan Skyline GT-R Nismo

      By Rezz · Posted

      Starting with issues 1 - 5, we have already run into a problem...!  Issue #4 contained 2x front brake calipers, instead of 1 caliper and 1x steering knuckle. Will have to call DeAgostini on Monday to sort it out. Anyway here's some photos.  Issue #1 is the front bumper, headlights and number plate. Issue #2 is the front wheel (with "We produced with spartan air." text on the centre cap!) and tyre, the front lip spoiler and cylinder head cover with ignition coils under the centre cover... which will never be seen again. Issue #3 is the bonnet and cylinder head. Issue #4 is the front strut, brake disc (with laser etched metal discs) and brake caliper. I stopped here because of the issue with the missing steering knuckle.  Next update will be #5 - #10 in a few weeks.
    • Rezz
      DeAgostini 1/8 scale BNR32 Nissan Skyline GT-R Nismo

      By Rezz · Posted

      DeAgostini is one of a few companies that release quite large (the largest commonly available size actually) 1/8 scale models in a series of weekly issues over 100 - 110 instalments.  They release different models for different markets and DeAgostini Japan have release the BNR32 Skyline GT-R Nismo last month. I've made two of these 1/8 scale sized cars (one an R35 GT-R from 2012 - 2014, the other I'm just about halfway through, a BNR34 Skyline GT-R from the 2Fast 2Furious movie) so when this R32 was announced there was no way I could ignore it as it's my favourite out of all Nissans.  Each issue costs around $20 so it costs about $2.2K when completed. I suppose it is very expensive for what it is, but the quality and details are really very good, and there are many "gimmicks" like fully functioning exterior and interior lights operated with a remote control, working steering, all doors/bonnet/boot/fuel lid open and close, the side mirrors fold in and it even has a speaker for the engine revving sounds when you turn the lights on.  Each issue comes with a magazine that tells the story of the BNR32 Skyline GT-R Nismo from the first design stages of the BNR32 to Group A homologation and the various racing version that were run in the Japanese Group A and JGTC, and Australian Group A.  So I plan to update the build in this thread 5 issues at a time.  https://deagostini.jp/r32/?srsltid=AfmBOooKjxDc4EUK2rmXqMBPgyHfFJ24s4oEPJBNpnF-lFlsRoW0PE6P
    • Predator1
      Billet Merge Collector for manifold

      By Predator1 · Posted

      As per title.. has anyone used so far? Keen to hear results, comparisons. In the market for a new mani for my new turbo. Any issues cracking?
    • MBS206
      Help Understand GTT Boost Setup

      By MBS206 · Posted

      Re read everything that has been written about this in this thread.. Let us know if you're still confused.
    • joshuaho96
      Help Understand GTT Boost Setup

      By joshuaho96 · Posted

      This would be a new pump with new gears. I'm just unclear on whether it's a good idea to run more oil pump flow if you don't actually need said flow. Oil level is set a minute or so after shutting off a warm engine so wouldn't the high RPM oil level in the sump end up lower all things equal? Plan is OEM clearances, main concern in my mind is whether the OEM pump can keep up with the flow requirements of any additional oil coolers.
×
×
  • Create New...