javawave wrote:
StarMyram wrote:
Was at my brother's last night. He had a (carboned) but otherwise good, set of used aluminum heads off a 2005 diesel truck, apparently the heads were removed due to stuck exhaust valves. The heads were replaced on warranty, apparently the 2005 and older diesel trucks in our colder climate "idle too slow and run cold" causing carboning and sticking exhaust valves.
The 2006 and newer trucks are factory programmed to increase RPM's automatically to maintain hotter engine temps to avoid carboning and premature engine wear from running too cold. 2005 and older are reprogrammed to correct the condition too.
Now, I wonder if SVS or carboning on a Roadie has anything to due with colder climates or regions?
Maybe the engine runs too cold to burn out the carbon and prevent it from forming.
Does a Roadie still develop SVS in Arizona or Mexico where it's always hot?
Just something to think about?
They are also set to run hotter to meet the new emission standards. Reburn the gases in the exhuast. From most reports I am getting it hasnt met with favorable reviews.
That's what they did back in the early '70's to '80's gas motors (and 1/2 ton LD diesels)
These new particulate exhaust filter catalysts are a real PIA! The stupid things plug up, unless you drive the hell out of the truck for 45 minutes every day, they will plug the exhaust filter. This is not good for welding trucks that have to sit all day running on a jobsite. You can't take the exhaust filters off either, as they are part of the complete engine management system.
EGR (EhxaustGasRecirculation) systems are used to recirculate some exhaust gas back into the air intake so there's not as much oxygen going into the cylinder to burn the fuel the fuel - this
system LOWERS THE COMBUSTION TEMPERATURE so that there is less Nitrogen Oxide (greenhouse gas) produced. BUT.... Because they have fed exhaust gas back into the cylinders, and it LOWERS the combustion temperature, the engine will burn lots more fuel, and be less efficient (as there is less pure oxygen going in.) And the engine oil gets BLACK BLACK as a result of all this dirty exhaust gas being recirculated, causing COOLER, MORE INCOMPLETE combustion in the cylinders.
But this is no problem for the engineers, because "the new exhaust particulate filter catalyst" is here to the rescue!! What the EGR'd engine can't completely burn to make clean efficient power, the exhaust filter catalyst will burn, as more RAW diesel is dumped down the tailpipe to aid in raising the exhaust temperature to clean the catalyst...
-Wouldn't it make more sense to burn the fuel "in the engine" instead of "in the exhaust system?"
2001-2003 trucks were not EGR or Catalyst, and got 24-25 MPG with no SVS.
20007-2008 TRUCKS are EGR and Catalylt, and get only 16-20 MPG with lots of SVS problems.
(They have also lowered rthe compression ratios on these newer diesels.)
.....Now go figure, HOW DOES BURNING MORE FUEL, WITH LESS EFFICIENCY make things better for the environment?!!!

(The envronmentalists get more government funding form the fuel taxes collected on all the extra fuel being consumed by less efficient vehicles....???)
This EMISSION CONTROL THEORY is one reason the muscle cars of the '60's were phased out, and the compression ratios went from 10.5:1 (350
HP) to a measly 7.5:1 (135 HP) on an average V-8 car motor. Gas mileage plumeted, and made the oil crisis even worse. BUT HEY! ALL THESE NEW EMISSION CONTROL SYSTEMS ARE GOING TO SAVE THE ENVIRONMENT, EVEN IF THEY BURN MORE FUEL AND MAKE MOTORS GUTLESS!!!

(Better think again on that one, you idiotic Engineers and Envoronmentalists!)
I am getting sick of these EnvironMENTALists telling us what is good for us, and they don't have a clue what they are talking about.
OK, it was a bit off topic. But I think we are being fed a line of crap when it comes to these newer vehicles. And a lot of problems are created by these newer emission controls and crappy cheap-assed fuels they sell us now!
Have a day everyone. I'm now going out to start my older "smoky-but EFFICIENT" non emission controlled Cummins Diesel!

-Chew on this Yummy Exhaust Smoke, David Suzuki & Al Gore!