SammyS

Engine is running 285 F* ----backstory--->So I finally just got my 993 C4S running again. The old engine was accidentally upshifted (from 4th to 3rd @ redline) and shot a piston through the core. But before everything was running smoothly... The new engine is a used and was just put in. Both are vario-rams. The car has the oil pressure at 4-5 bar on the gauge at idle on start up. Once warmed up, it dips down to .25-.5 bar at idle. I just flushed the oil lines and changed the filters+oil for the 3rd time. Gage on the car reads 1/3 of the way hot but on OBD display it is reading plus 285.. In all honesty I am not sure what is going on. Currently have it garaged. Has anybody dealt with this before?

PRSWILL

There is now way that is normal. On start up your oil pressure should be low- only when you rev the engine or are at speed should you ever be at 4-5 on the pressure gauge. That heat is also way too high. My care BARELY ever sees the heat gauge touch anything near the red zone unless I sit in traffic with the AC running in July.
Something is going wrong and I'd get it looked as ASAP- good luck .

PRSWILL

Sorry - some I phone spelling errors but you get it-

Gbos1

Oil Pump? Should be at 1.5 - 2 BAR once warmed up at idle. Electric Fans working? Sounds like your Temp Gauge sending unit is faulty.

Quadcammer

Your oil pressure at idle is horrific and the light should be on.

I'm guessing the temp sensor you are reading is cylinder head temp not oil. Not sure how 285 translates, but it doesn't sound unreasonable.

Figure out whats going on with your oil system first

OverBoosted28

This is at idle, and VERY warmed up, after trying to calibrate oil level float. My oil pressure has never been at ".25/.50". You have a starvation issue somewhere. Get that fixed, and assure it's a "reading" fail, as opposed to actually having very poor pressure.

pp000830

Should be at 2 +/- when warmed up. If it is as low as you say extra heat may be coming from friction due to inadequate lubrication.

Andy

user 723923490

Also check oil level on the dipstick.

Jlbarnett

I've never really seen oil pressure below 2 bar.

I would check the oil pressure sending unit, its not very easily accessible on varioram cars with SAI, its under the varioram manifold beside the crankcase breather.

SammyS

Thank you gentlemen. I have just changed the oil to 20W-50 from 0w-40. partial improvement followed with .75 bar of pressure at warmed up idle. Going to take it into the shop. I am thinking maybe the sensor is bad because I hit the gas on it a couple times while driving and was +4 bar above 4000rpm but then returned to the .75 bar at idle...

Jlbarnett

Anything above about 1200RPM , my pressure it pinned at 5 bar.

shadow993

Why in the world did you have 0/40 oil??

Churchill

If "inadequate lubrication" was causing "friction" in the engine, the engine would seize in a matter of seconds, not generate "extra heat."

phoneyman

This statement lacks even a remedial understanding of physics. Theres a difference between having inadequate lubrication and no lubrication at all. An engine would seize when the power/inertia generated by the system cant overcome the force of friction.

Stick your fist in a Pringles can and vary how hard you clench, then tell me you cant increase friction and still move your hand

NYC993

wow ok...pringles example certainly demonstrates understanding of internal combustion engine and the physics involved. The point of Churchill was that once you lose adequate lubrication (oil starvation) the consequences will seize the engine almost immediately without any heating issues caused by excess friction.