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2.3 Dohc life expectancy

  #1  
Old 02-05-2019
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2.3 Dohc life expectancy

I'm currently sitting at 216.8K miles and I properly maintain it aswell as never exceeded 3500rpm, how much longer will it last? (M50dr1, 225 tires stock height, no lift, new coolant return tee (garbage plastic))
 
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Old 02-05-2019
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Originally Posted by tbone3366 View Post
I'm currently sitting at 216.8K miles and I properly maintain it aswell as never exceeded 3500rpm, how much longer will it last? (M50dr1, 225 tires stock height, no lift, new coolant return tee (garbage plastic))
what about that ''electric turbo''?
 
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Old 02-05-2019
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Originally Posted by djfllmn View Post
what about that ''electric turbo''?
That's just increased air pressure for constant flow at all rpm ranges, 7000 ft altitude, Williams az
 
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Old 02-05-2019
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This forum post is about the max lifespan of the engine, I'll post about that stuff on that post but keep this one strictly to life span and nothing else
 
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Old 02-05-2019
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Its a Mazda L engine and came in different displacements, and they did have their issues but the 23 seems to last
Mazda L engine models here: https://en.wikipedia.org/wiki/Mazda_L_engine

They have been made since 2001 so 18 years and still being made, so at 20k miles a year there should be some early models approaching 400k miles
I would check other forums for the models that used the 23 or similar Mazda L engines to see whats come up
 
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Old 02-05-2019
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The problem is at the other forums (some Mazda forums are admin locked for no new accounts) is I can't find anything on this engines lifespan, thank you for the info, I just replaced the head gasket and there was still no scoring on it, I went through the fender gaurd to get the tee replaced, are there any other issues that should come up and become a concern?
 
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Old 02-05-2019
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Originally Posted by tbone3366 View Post
The problem is at the other forums (some Mazda forums are admin locked for no new accounts) is I can't find anything on this engines lifespan, thank you for the info, I just replaced the head gasket and there was still no scoring on it, I went through the fender gaurd to get the tee replaced, are there any other issues that should come up and become a concern?
at that mileage..ANYTHING can go
 
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Old 02-05-2019
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Ok thanks for the heads up
 
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Change PCV Valve every 2 years for sure, once a year is better when mileage is high
 
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Old 02-05-2019
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Originally Posted by RonD View Post
Change PCV Valve every 2 years for sure, once a year is better when mileage is high
Please don't bash on me for not know but what does the pcv do and why change every two years
 
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PCV is positive crankcase ventilation

Every time a cylinder fires, some of the explosive gases "blow-by" the piston and rings and travel into the crankcase, this is called...............wait for it....................Blow-by, lol.

The blow-by vaporizes some of the oil on the piston, rings and cylinder walls, it's 3,000degF+
This is where the oil vapor in the engine comes from, bearings and valve train never get hot enough to vaporize oil

In the old days there was just a vent tube on the lower block or upper oil pan that allowed the blow-by gases and oil vapor to escape, constant drip of oil after engine had 50k miles, lol.

The PCV system was added so the blow-by gases could be reburned, like the EGR system does with the same gases.
PCV uses engine vacuum to pull air from inside the engine/crankcase and into the intake manifold

The oil vapor on the other hand doesn't need to be burned, it can be condensed and left in the engine.

So the PCV system will usually have a baffle setup in the valve cover to condense as much oil vapor as possible, so mostly the blow-by gases are sucked into the intake to be reburned

In the case of the 2.3l Duratec the PCV Valve was put on the crankcase, drivers side, and not in the valve cover, so pain to get to on Rangers but not in Cars

PCV system also has a fresh air or breather hose, it should be pulling in air to the engine from the "filtered air" system, so from between air filter and intake.
This fresh air reduces oil vapor by cooling it, but also allows PCV to pull in a larger volume of air than just the blow-by so the system can run and get a little dirty for a few years until PCV Valve needs to be changed.
Blow-by increases as engine gets older, just normal wear and tear on the rings, so oil vapor also increases with blow-by
So PCV valve should be changed more often, or cleaned very good, lol.

If PCV Valve gets too dirty, it can't pull in as much air, then blow-by and oil vapor will flow OUT the breather hose, unfiltered, and is sucked into the intake, giving it an oil coating inside and less efficient operation of the engine.
 
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Old 02-05-2019
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Originally Posted by RonD View Post
PCV is positive crankcase ventilation

Every time a cylinder fires, some of the explosive gases "blow-by" the piston and rings and travel into the crankcase, this is called...............wait for it....................Blow-by, lol.

The blow-by vaporizes some of the oil on the piston, rings and cylinder walls, it's 3,000degF+
This is where the oil vapor in the engine comes from, bearings and valve train never get hot enough to vaporize oil

In the old days there was just a vent tube on the lower block or upper oil pan that allowed the blow-by gases and oil vapor to escape, constant drip of oil after engine had 50k miles, lol.

The PCV system was added so the blow-by gases could be reburned, like the EGR system does with the same gases.
PCV uses engine vacuum to pull air from inside the engine/crankcase and into the intake manifold

The oil vapor on the other hand doesn't need to be burned, it can be condensed and left in the engine.

So the PCV system will usually have a baffle setup in the valve cover to condense as much oil vapor as possible, so mostly the blow-by gases are sucked into the intake to be reburned

In the case of the 2.3l Duratec the PCV Valve was put on the crankcase, drivers side, and not in the valve cover, so pain to get to on Rangers but not in Cars

PCV system also has a fresh air or breather hose, it should be pulling in air to the engine from the "filtered air" system, so from between air filter and intake.
This fresh air reduces oil vapor by cooling it, but also allows PCV to pull in a larger volume of air than just the blow-by so the system can run and get a little dirty for a few years until PCV Valve needs to be changed.
Blow-by increases as engine gets older, just normal wear and tear on the rings, so oil vapor also increases with blow-by
So PCV valve should be changed more often, or cleaned very good, lol.

If PCV Valve gets too dirty, it can't pull in as much air, then blow-by and oil vapor will flow OUT the breather hose, unfiltered, and is sucked into the intake, giving it an oil coating inside and less efficient operation of the engine.

Thank you for letting me know
 
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