What's the deal with diesel engine coolant? How is it different from coolant used in a gasoline engine?
Here’s the quick answer:quote:
Originally posted by 55:
What's the deal with diesel engine coolant? How is it different from coolant used in a gasoline engine?
It can be a little rough on water pump seals.quote:
Originally posted by Michael Polutta:
Is there any benefit to running diesel coolant in a gasoline engine? Is there any danger/downside?
Just curious...
"Wet sleeved" simply means that cavitation *could* be a problem. Coolant is circulating around the cylinder in a wet sleeve design.quote:
Originally posted by ChrisW:
G 05 spec coolant is a precharged formula, and is ok to use in gas or diesel applications. If Ford and Chrysler are using it in gas cooling systems with no problems so far, and also in diesels (like the powerstroke diesel), I haven't seen a problem yet from using a "precharged" coolant in a gas engine. If anything, it would resist cavitation better than a gas engine only coolant.
Also, it has to do somthing with wetsleeve systems, though I don't know the full details as to why, I do know that diesels are wet sleeved, or most i think.
Mickey I think has the definition of diesel cavitation explained really well, except for the part of what causes the cylinder wall to flex.quote:
Every time the pistons move up and down, they rock in the bore, causing the cylinder wall to vibrate. Vapor bubbles can form on the outside of the cylinder wall...
A minor detail, but you cylinder pressures are way off. The readings you provided are typical cranking compression readings on an engine that isn't running. Actual pressures with the engine running, especially under load are much higher, and yes, they are much higher still on a diesel compared to gasoline engine.quote:
From what i've learned, the vapor bubbles which cause the cavitation are formed simply by the high cylinder pressures and compression ignition of fuel. Most gasoline engines, running < 93 octane, have < 11:1 compression ratios. Diesels are on the order of 17:1 to 24:1, thereabouts. Cylinder pressures of gas engines < 200 psi whereas the norm for diesels are > 300 psi, 500psi typical. [/QB]
There is a very similar problem with props on large ships, and there the research extends back to before WWI that it's the collapse of bubbles that causes the erosion.quote:
Originally posted by Stinky Peterson:
.... There is some disagreement about the actual mechanism of cavitation erosion/corrosion. What is know is that bubbles and vibrations are involved. When the liners move in the bubbles are formed, however I've always had trouble accepting the idea that the collapse of the bubbles are what cause the problem. ....