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Old 02-20-2006, 09:25 PM
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cooling e.g.r. air....

would there be any gain in mileage if one were to reroute the hot e.g.r. gas to a cooler,then back into the intake?

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Old 02-20-2006, 11:11 PM
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Intercooled EGR is starting to take hold in diesel. Its primary function is to reduce combustion temperatures and therefore NOx emissions. Cooling the intake air will make it denser, and therefore more fuel will be injected to keep it at the same mixture. We'd only be talking a very minimal amount; probably not noticable. Hotter air is less dense and has less O2 per volume, meaning less fuel gets injected and better mileage.

Cooler intake charges make power, hotter intake charges make mileage.
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Old 02-21-2006, 10:33 AM
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NO, how much cooler could it make the 1600* combustion?
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Old 02-21-2006, 10:51 AM
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Cooling the EGR gasses 100 degrees will cool the intake charge a proportional amount. If its 10% EGR, then it should reduce those temps by about 10*. That's why I said it would probably not be noticable.

More EGR gasses will reduce combustion temps much more; at the expense of power, but to the benefit of mileage and reduced NOx.

So I guess the question would be; is it aftercooled or precooled. If you cool the EGR gasses first, you would be in effect adding MORE EGR gasses per metered volume, which could increase MPG at the expense of power. If you cool EGR after its metered, you won't get much benefit.
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Old 02-21-2006, 04:06 PM
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yes, i meant to have it cooled before it goes into the intake.it would be the same amount,no extra air added in,just the exhaust.
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Old 02-21-2006, 05:28 PM
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Quote:
Originally Posted by sc2dave

would there be any gain in mileage if one were to reroute the hot e.g.r. gas to a cooler,then back into the intake?
It (EGR Cooler) increases performance (one logically then assumes mileage) as it somewhat cools the intake charge. FORD used EGR coolers back in the eighties on CFI. It was mounted at the rear of the EGR plate and was coolant cooled.

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Exhaust Gas Recirculation (EGR) System

The purpose of the Exhaust Gas Recirculation (EGR) system on your engine is to limit oxides of nitrogen (NOx) emissions. This is done by re-directing small amounts of exhaust gases back through the upper intake which get mixed in with the air/fuel charge. This "diluted" air/fuel mixture (i.e., less oxygen per cubic foot) burns cooler and hence combustion chamber temperatures are reduced, thereby lowering NOx emissions.
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