Is a 12.7 Egr Detroit a decent motor?
Are these any worse for Egr problems than the 14 L?
Is this a good question?
Yes they are worse, if they have EGR. This is why: EGR controls NoX pollutants. The more work that an engine does (load), the more NoX it produces. Therefore, if you have put a 12.7 and a 14 under the same high load, the 12.7's cylinders will be working harder, and will produce more NoX, than the 14L. Another way to say this, is that the 14L will require less EGR than the 12.7 when put under = loads, since the 14L is larger, and not working as hard to produce the same power as the 12.7.
If you take EGR out of the equation, the 12.7L is better, because you are producing the same power with less friction (the pistons and liners are smaller on the 12.7).
This is why DD went with 12.7L for pre-EGR years, and then discovered that the 14L was more efficient with EGR years (less EGR needed than 12.7L).
I am not real familiar with the Detroit EGR system but detroit has always been one to basically design an engine and then just make the parts bigger or smaller based on what they needed, good chance they actually use the same EGR system.
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