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dannyg
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| Posted: Mar 04 2008 at 8:03pm | IP Logged
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hello out there for help in the tian needs real resr end like 9-10inch real posi would be great weres nissan getting this diesel from what i hear more gas motor is needed the frontier need some real posi rear ends
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06 frontier 4.0 auto
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thedave360
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| Posted: Mar 04 2008 at 8:59pm | IP Logged
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reinerka wrote:
Boomer wrote:
| Also consider that with the new lower sulfur diesel fuel and the required emission control, diesel engines are now supposed to have significantly shorter lifetimes, comparable to that of a gasoline engine. |
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Where did you hear that they decrease engine life?
While it is true that the latest generation of High Performance Diesels in Europe are geared for vehicle use (= non truck use) they still last forever - irregarding of emissions control systems.
The way it emissions are achieved has nothing to do with internals of the engine. BluTec i.e. injects at the exhaust - and thus has zero effect on the engine life.
Reiner |
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From what I understand (and I could be wrong) the sulfur in the diesel acts as lubrication for the direct injectors. If the injectors get messed up, it can do nasty things to the engine. Also, if the sulfur still acts as a lubricant in the cylinder, reducing the amount of it in the fuel could decrease engine life.
But thats just what I have come to understand.
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Shift_Your own gears
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dannyg
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| Posted: Mar 04 2008 at 10:09pm | IP Logged
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thats what i heard to but the diesel engine of could be the ones with problems do to low sulffer in older motors will have the problems the new duracrap or duramax imine 6.4 twin turbo power slop oh powerstroke ,6.7 inline 6 power house cummins are tuned for this new fueli`m starting to be a fan of bio diesel btw had a friend with a duramax and its a duracrab motor
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Boomer
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| Posted: Mar 05 2008 at 5:54am | IP Logged
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I have seen numerous articles in tech journals about the fact that reduced sulfur in diesel will have a negative effect on diesel engine longevity. Keep in mind, however, that today's gas engines can go 200,000+ miles so saying that a diesel will wear about like a gas engine is not a condemnation of early death but rather an expectation of similar longevity.
Again, diesel is nice IF you need the torque but you can shell out a lot of bucks on one initially and on the fuel required to run it.
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S.A.R.Tech
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| Posted: Mar 05 2008 at 10:33pm | IP Logged
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we managed to find a way to live without leaded gas, we'll learn a way
around sulpher too. Doesel is the wave of the future. Stay tuned.
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dannyg
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| Posted: Mar 06 2008 at 5:20am | IP Logged
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hey thats pretty cool never thought of the lesded gas and old diesel fuel that way your right
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thedave360
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| Posted: Mar 06 2008 at 12:33pm | IP Logged
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Not exactly. Lead was something PUT into the gasoline to increase its octane level. Sulfur is juts there in the diesel. It comes with it from the crude oil. Lead causes cancer, birth defects, and (obviously) Lead poisoning. Sulfur is not as bad. Yeah, it does increase acid rain and other things, but some scientists think that it might actually counteract the effects of global warming. They say that the sulfur dioxide reflects sunlight back into space. This is the opposite of what carbon dioxide does.
But you will hear none of that if you listen to Al Gore and his friends. He thinks everything is doom and gloom. But he is not a scientist, he is a politician...and nothing more!
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Shift_Your own gears
Baton Rouge, LA
'04 Frontier XE
2.4L 5speed
***MODS***
Flowmaster 40 Series Exhaust
APC Air Intake
Red Calipers & drums
4 Kenwood Speakers
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dannyg
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| Posted: Mar 06 2008 at 11:17pm | IP Logged
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whats up now hang on here i though the lead in fuel was to lube the valve seats i` not btw anyone rember water injection for an octane boost
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thedave360
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| Posted: Mar 07 2008 at 10:26am | IP Logged
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Back in the day, Tetra Ethyl Lead was added to gasoline to stop engines from knocking. Knocking is when the gasoline in the cylinder explodes before the spark plug goes off. T. E. Lead raised the octane level so engines would stop knocking. Not to lube the valve seats.
Water injection was used by air planes a long time ago to increase the octane. The water was mixed with Alcohol. Its done mainly to forced induction engines (engines with turbos/superchargers that make a lot of boost). It technically does not increase the octane rating of the fuel you are using, it just makes the fuel less likely to pre-detonation (which is knocking). I do not see how or why anyone would use this today, just use a high octane fuel. The whole concept of boosting the octane of pump gas is largely ineffective. Even the "104+" octane boost is almost pointless. What is in the little bottle is 104 octane. Put that in your 15-20 gallon tank, and you get an octane boost of some incredibly small decimal number. If you really want high octane, take your street car to your local race track and pay $9/gallon for some 112 or 115. It won't make you go faster, and it WILL kill your car.
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Shift_Your own gears
Baton Rouge, LA
'04 Frontier XE
2.4L 5speed
***MODS***
Flowmaster 40 Series Exhaust
APC Air Intake
Red Calipers & drums
4 Kenwood Speakers
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Boomer
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| Posted: Mar 07 2008 at 1:58pm | IP Logged
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Actually, the old chemist is going to step in here and say that both octane improvement and valve "lube" were accomplished by the use of tetraethyllead, a thick viscous clear lquid. It did raise the octane significantly butalso produced lead oxide (paint pigment ) when burned. A thin layer of this lead oxide would coat the valve face of the exhaust valve and prevent metal transfer from the valve to the valve seat. This was termed "valve lubrication". This is when "soft" valves, no hardened valves were used in car engines. With the switch to unleaded gas, induction hardened valves were required to prevent this metal transfer or "valve burning".
Now, all of the lead oxide could not be allowed to build up in the engine so dibromoethane was added. This reacted to form lead bromide, a gaseous substance that went out the tailpipe and into the environment where it reacted with water to form plumbic and plumbous acids and hydrobromic acid. These acids also formed in cold mufflers and tailpipes where water condensed which is why leaded gas ate through exhaust systems so quickly.
Why didn't they put induction hardened valves in engines when lead was used? COST. Lead prevented the problem of burned valves for 50,000 or so miles. On old engines, you got a carb and valve job at about that mileage where the head was pulled, the valves ground along with the valve seat and the carburator was rebuilt.
Thus endeth the lesson from the past from the old organic chemist.
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2007 Nissan Frontier SE 4X4
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2003 Saturn L-300 sedan
2013 VW Passat TDI
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Nissan Frontier Forums : Frontier Towing / Hauling
Topic: Nissan Diesel
