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Originally Posted by texlurch
So you are saying the exhaust flow on the gas and diesel motor would be the same? Seems strange to me.. I know for equal displacement the intake side airflow would be similar, but I would have bet that there would be a pretty good difference on the exhaust side. Especially with the compression ratio diffference, and the longer burn time for the diesel.
Here is where I am trying to get. If a 6.5 diesel hits max boost and rpm on the turbo at 3000-3500 rpm, what would happen with the same motor on a 6.5 gas engine? I am saying it would have to run at a higher rpm to spin the turbo at the same rpm, based off exhaust flow. My guestimate is around 5000 or so on the gas motor, to get the same pressure and flow out of the turbo. At the same time, much over that and you would overspin the turbo and go past it's efficiency range.
Close?
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On a gas engine the exhaust gases are expanding more as it exits the chamber which will spool the turbo up quicker.
The higher compression ratio is what gives the diesel the advantage.