Engine braking Gas Vs Diesel
Just wondering why gas engines have better engine braking than diesel. No real reason, just wondering. With the higher compression of the diesel I would think that diesel would be better but understan...
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Thanks Shiner, good info.
So do the early 2011-2014 Powerstrokes just use a separate exhaust valve as an exhaust brake?
There is Holset Turbo Brochure that talks about the Holset M2 with its rotary valve used in the Titan XD. And it says this:
Perhaps the rotary valve doesn't provide as good/fine control as VGTs, I dunno. But as Nissan never mentions Exhaust Brake, just tranny braking in everything I've seen, my guess is it's not being used for whatever reason. Too bad, as it would be a real selling point for me.
So do the early 2011-2014 Powerstrokes just use a separate exhaust valve as an exhaust brake?
There is Holset Turbo Brochure that talks about the Holset M2 with its rotary valve used in the Titan XD. And it says this:
Holset Brochure wrote:
it may be necessary briefly to make the engine work harder in order to raise the exhaust temperature to regenerate a diesel particulate filter in the exhaust aftertreatment system. Positioning the rotary valve to restrict the exhaust passage produces the necessary increase in exhaust back pressure to make the engine work harder, and therefore hotter. If the rotary valve is closed completely, the exhaust passages are blocked providing an engine brake without needing any extra hardware.
Perhaps the rotary valve doesn't provide as good/fine control as VGTs, I dunno. But as Nissan never mentions Exhaust Brake, just tranny braking in everything I've seen, my guess is it's not being used for whatever reason. Too bad, as it would be a real selling point for me.
