Quote:
Originally Posted by teamroper60
That is true. However a side effect of lowering the combustion temperatures IS lower cylinder pressures. Another side effect of using EGR is that timing must be increased due to the slower burn.
So, if you increase the combustion temps and you will also raise cylinder pressure. In addition, with the cleaner, quicker burn, the timing will also be increased. Increased timing also raises cylinder pressures. So you are effectively raising cylinder pressures twice..
Again though, we don't know how much we are raising the pressures, so we don't fully know if the increase is enough to put the headgaskets in danger.....
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I am sure that there is a pressure /temperature relationship involved and I agree that timing would be affected. I also agree that in the absence of hard data we are guessing at what that change would be.
I do think however that the concept of Exhaust Gas Recirculation was never intended as a means of controlling cylinder pressure/temperature for the purpose of protecting the head gaskets. For instance, under heavy loads the EGR valve is closed. Factory programming does this. The EGR Valve only opens under light to medium load conditions. Therefore I think that the design of the engine already accounts for a shut EGR Valve.
