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Old 02-15-2006, 10:46 AM   #1
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Default Why do diesel Engine last longer than Gas Engines?

I was just wondering why Diesel engines last longer than Gas engines. I heard diesel engines dont brake in till 100k miles. Whats the story?
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Old 02-15-2006, 10:54 AM   #2
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I can't give you an exact answer, but reason would have to stand that part of it is simply due to much heavier duty components. Your talking about an engine that runs at an extremely higher compression ratio thatn a Gas engine. 20+ vs 9+ on average.
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Old 02-15-2006, 10:58 AM   #3
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That and they redline much lower then a gas engine. Lower RPM = slower wear on parts. No two ways about that.
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Old 02-15-2006, 11:33 AM   #4
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diesel fuel is a lubricant in itself, low RPMs definitely help drivetrain and engine components last longer, but diesels last longer because of two main factors....

number one, they are built tough as hell, they use iron blocks and iron heads. thick iron has a better fatigue life that aluminum or milled steel. diesels must sustain a very high compression ratio, so therefore they tend to make those iron sidewalls a lot thicker and overbuild the pistons.

number two reason, diesels (especially truck and industrial diesels) have tapered piston rings. they also have more compression rings than your normal gas engine...to keep blowby from occuring with such high compression ratios. tapered rings dont wear out as fast as flat rings. when flat rings wear out, they stop expanding against the cylinder wall and allow blowby. at the same point in engine life, when normal flat rings are worn out, a tapered ring will still perform because as the piston moves up the air pressure forces it to expand, regardless if it is holding its normal tension or not.

also most diesels use sleeve cylinders, this helps with rebuilding, you dont need to remachine and hone the block, just drop in a new sleeve and piston and go. new diesel technology has allowed engines to last for a million miles or more without rebuilding....

i'm sure if i'm wrong in any way Al will let me know
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Old 02-15-2006, 01:11 PM   #5
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^^^^... pretty close to what I was gonna say..... just alot better....
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Old 02-15-2006, 06:52 PM   #6
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X2 on the fact that diesel is basically oil. Hella lubricating properties compared to gasoline. This is why the rings, and cylinder walls experience virtually no wear.
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Old 02-15-2006, 07:18 PM   #7
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number two reason, diesels (especially truck and industrial diesels) have tapered piston rings. they also have more compression rings than your normal gas engine...

iu dont know about more rings i pulled apart a cat 3406a and it had 2 comprestion rings and the normal oil control rings also about desil being a lubricant is also right but another thing is the fuel dosent break down the oil like gasoline dose
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Old 02-15-2006, 10:25 PM   #8
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Less moving parts too.
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Old 02-15-2006, 10:39 PM   #9
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Quote:
Originally Posted by VooDuuChild
Less moving parts too.
huh?

where did you come up with this?

W04... diesels are just made better.......plain and simple, but neither will last if you dont take care of them...
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Old 02-16-2006, 12:11 AM   #10
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Trippin and tired, confusing two strokes with diesels, hahaha, time to sleep!!! (not that twos last longer than fours, just in design)
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Old 02-16-2006, 05:54 AM   #11
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Quote:
Trippin and tired, confusing two strokes with diesels
There ARE two stroke Diesels out there.
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Old 02-16-2006, 07:27 AM   #12
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I asked this same question before I purchased my F250 diesel. The answers I got were inline with what everyone here is saying. The mechanic I talked to stessed the act that heavier duty parts combined with lower RPMs helped more then anything else. He said that a Diesel motor is actually designd to not break imagine that.
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Old 02-16-2006, 09:02 AM   #13
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Also the oil is High detergent, helps keep your bits clean.
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Old 02-16-2006, 09:23 AM   #14
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So would the libby diesle engines last a long time? If properly taken care of could that last 300k miles like the big diesels?
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Old 02-16-2006, 12:22 PM   #15
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Yes!
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