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NHC-250's were plumbed into the intake horn of the engine stock. Except now the path has to go up out of the valve covers, up a hose, into the filter housing, back over a 2" rise, then down the intake tubing, make a 90*, go a foot, make a 30* turn, go another foot, make a 90*, go a few inches, make another 90*, go into the turbo, back out of the turbo, into the crossover manifold (which makes two 90* turns), then it'll be where it was factory.Be careful sucking the crankcase vapers back to the air filter if to much oil is sucked you will have a runaway diesel.
Except now the path has to go up out of the valve covers, up a hose, into the filter housing, back over a 2" rise, then down the intake tubing, make a 90*, go a foot, make a 30* turn, go another foot, make a 90*, go a few inches, make another 90*, go into the turbo, back out of the turbo, into the crossover manifold (which makes two 90* turns), then it'll be where it was factory.
I will look and take a pic when I get into work in the morning.I wonder if I can find how they did it on the Cummins 290 since that's really what my engine "is" now.
You find this in many vehicles. Some sort of baffle that appears to be directly in the way of airflow thru the filter. It is done on purpose and with good reason. In a manner it's another stage of filtration.... While I was in there I decided to remove the sheetmetal that blocks nearly half the air filter. Seriously, I can't understand why they did this. Some time with the die grinder and it was free....
Don't doubt for a second that you're absolutely right here, lino; good stuff:You find this in many vehicles. Some sort of baffle that appears to be directly in the way of airflow thru the filter. It is done on purpose and with good reason. In a manner it's another stage of filtration.
That said, the original engineers did the right thing too, as any compromise [particularly with a military vehicle] that has a minor negative effect on performance but an increase in reliability is a good one.
ciao
lino
Engineer, yes.- Are you maybe a registered engineer?
- From Italy!?
Don't doubt for a second that you're absolutely right here, lino; good stuff:
- Are you maybe a registered engineer?
- From Italy!?
Might need to get me a Scratch Ticket todayEngineer, yes.
Well, not registered... Degree, yes. Registered/certified/professional, no.
Certifiable? Yes, absolutely (but perhaps not as engineer ...)
From Italy, indirectly. My father was born there.
ciao
lino
Drew, on a naturally aspirated diesel engine it is ok to run it back in to the intake. On a turbo charged diesel engine it is a no no! It creates a very real danger for a runaway. The problem is not when all is well, as you pointed out, it will not get enough oil to matter. If you have a piston or ring failure you will have a runaway engine almost guaranteed. I would just run it down next to the oil pan and vent it to air.....Here's a pic of how it was routed stock. As you can now see from my earlier description, it's got a lot lot longer path to follow now! The red box shows the stock line where it was plumbed into the intake horn.
View attachment 535586
Patracy what did you finally end up doing with your fuel switching valve? I know you where going to look for a electric one. Did you find one that will do both the fuel and the vent line? Also where did you relocate this too on your SEMTT?
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