Oil pressure
Burning Brakes
Joined: Jun 2014
Posts: 981
Likes: 157
That seems really low since I'm used to a car that shows over 90psi on a cold start, runs 60psi at 2K rpm hot, and idles at 30psi hot. That's also with 5W-30.
I KNOW the engine only needs enough pressure to deliver enough oil to keep things cool, and that hydrodynamics is supposed to keep things from rubbing together, but...
I suppose going to a low pressure system is part of the quest for fuel economy, but what are they giving up in return? You gotta save a lot of gas to make up for a spun main bearing.
I KNOW the engine only needs enough pressure to deliver enough oil to keep things cool, and that hydrodynamics is supposed to keep things from rubbing together, but...
I suppose going to a low pressure system is part of the quest for fuel economy, but what are they giving up in return? You gotta save a lot of gas to make up for a spun main bearing.
Last edited by WelderGuy; Jul 15, 2014 at 06:00 AM.
E-Ray, 3LZ, ZER, LIFT
Joined: Sep 2007
Posts: 34,951
Likes: 12,363
From: NE South Carolina
That seems really low since I'm used to a car that shows over 90psi on a cold start, runs 60psi at 2K rpm hot, and idles at 30psi hot. That's also with 5W-30.
I KNOW the engine only needs enough pressure to deliver enough oil to keep things cool, and that hydrodynamics is supposed to keep things from rubbing together, but...
I suppose going to a low pressure system is part of the quest for fuel economy, but what are they giving up in return? You gotta save a lot of gas to make up for a spun main bearing.
I KNOW the engine only needs enough pressure to deliver enough oil to keep things cool, and that hydrodynamics is supposed to keep things from rubbing together, but...
I suppose going to a low pressure system is part of the quest for fuel economy, but what are they giving up in return? You gotta save a lot of gas to make up for a spun main bearing.
"The LT1 oiling system – including oil-spray piston cooling – was also optimized for improved performance. It is driven by a new, variable-displacement oil pump that enables more efficient oil delivery, per the engine’s operating conditions. Its dual-pressure control enables operation at a very efficient oil pressure at lower rpm coordinated with AFM and delivers higher pressure at higher engine speeds to provide a more robust lube system for aggressive engine operation.
Standard oil-spray piston cooling sprays the underside of each piston and the surrounding cylinder wall with an extra layer of cooling oil, via small jets located at the bottom of the cylinders. For optimal efficiency, the oil jets are used only when they are needed the most: at start-up, giving the cylinders extra lubrication that reduces noise, and at higher engine speeds, when the engine load demands, for extra cooling and greater durability."
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