The smog is the biggest crap I've ever seen on an engine in 35 years!!
The smog blows fresh air in the system two positions; under 2000revs just after the cat and above 2000revs straight on the exhaustvalves IN THE OPPOSITE WAY OF THE GASSTREAM!! How stupid can that be!! Because that cold ray of air blows exxentric on the valves, they will deform..
The cold air lowers also the exhaust gastemperature and moist in the muffler will shorten life of it. My truck is just 7 years in Holland.. One can see that all the bolts and nuts are undamaged, exept those of the exhaustpipe/headers... they are worn; I had to machine new ones. It tells me that the exhaustpipes are replaced a lot.
I've blinded off the EGR as well and MPG is improved, smoother run, more power and my engine remains clean. when I bought her, a thick layer of tar was in the inletmanifolds and the valves were damaged by all the tart what was sticking on the valves.
Let it be clear; an EGR is a gov. thing , only for the environment.
without the EGR, the O2 shall always cooperate with the EEC to reach the stochiometric value of 1:14,7 gas/air.
The inert gasses from the EGR lowers your combustionspeed (actually your timing retards) lowers the combustiontemp (powerloss) and because there's a natural law that say's " to keep a body on a certain speed, a certain amount of energy is needed to maintain on that speed". In other words, when the EGR is on duty, one shall push the acceleratorpedal deeper to keep speed. when I blinded it off, the first thing what I spotted, was the the pedal stood higher at same speed.
Now, they say that the EGR takes care for a lower NOx, okay? but when it messes your combustion, more fuel goes thru the engine and a lot of unburned will leave the tailpipe.
One must not forget, that the carmanufacturers and the oilcompany sleeping in oneand the same bed!! If your car can cope the environmental demands, it's okay and if the fuelconsumption rises, it's super to them!! All Gore happy, oilbosses happy, and as an extra bonus for the aftermarket sales, more work to do for carmechanics and more parts to sell.
Cars, oil and environment is pure politic games and we, as ordinary people are the"milkcows"of the governments.
This summer I've installed a woodburner in the house and 20cubic yard of wood behind the house is waiting to get burned this winter.... Environment? To leave a tree rotting away for years seems to make more CO2 than a quick burn in a burner... the Nuon(dutch natural gas company) shall not become rich over my back. but that was offtopic!!
best regards Ton
It's useless to blow cold air on hot valves.... Ruin your costly acquired combustion with gasses thru the EGR a waste of compression ratio. If you lower the compress ratio to 1:6 you get the same result; a lower combustiontemperature= worse combustion and a lot of unburned fuel out the tailpipe.
No and No.
An EGR system on a gas engine will increase fuel economy over the same engine without and EGR system. Lower fuel mixture, cylinder temperature and exhaust temperature in a gas engine is more efficient. High temperatures in a gas engine reduce power & performance, exhaust gas temperature directly limits power output in a gas engine(the reverse is true for compression ignition engines). EGR systems will not lower your compression ratio or cause unburnt fuel to run out the tail pipe.