More MPG for blocking off the air intake to the air compressor?

If you heard it from another truck driver it must be true.

 

Compared to running with a blown hose (huge boost leak), I say it possble to increase MPG. But if all is well, I doubt you'll see any measureable difference.

If this is an Acert cat, they have an update to stop that blown hose. It's 2 fittings and a braided hose. We used to blow those hoses all the time, but have had no issue since we updated them.

I've seen a lot of S60 Detroits blow that hose too. They get soft after years of use, they are behind the compressor and often overlooked on PM's. We check them and change them if they're getting soft. The Detroits make a loud pop when they blow. Cats make a poping noise similar to an exhaust gasket leak, but on the drivers side.

 

truth is, on some trucks, the compressor robs air from the intake. Less air getting to motor form intake means less power. maybe .2 mpg, not .75-1. If you give the compressor its own air feed you can keep it from robbing intake....but....it still needs to be filtered. You then block off where the compressor grabbed its air from before. The compressor cant be blocked off or u will run out of air.

 

100% crap. The air compressor is no way robbing air from the motor and will not increase efficiency in any way.

It would only be an issue if the restriction that limits the motor is upstream of the juncture. That is never the case.

A diesel is a fuel throttle motor anyway. The power output and efficiency is directly related to fuel consumption and airflow is a result of that not the other way around.

 

Your biggest savings would be from over the road repair costs. I know Penske lease paid $1100.00 for that eight inches of 5/8 hose when it blew a long way from nowhere with a new driver in the seat.

 

No measurable difference either way. I put a newer air compressor on my truck that picks up air from the air cleaner as opposed tribute intake manifold and didn't see any difference. The service rep said they went that way because of issues with egr and soot in the intake causing problems with the compressor valves. One thing for sure you know when the compressor is pumping air

 

I cant see mileage gains period unless you are already loosing boost. Compressor will kick on boost will drop momentarily and will spool boost right back up. May want to consider also unless you run south of I-10 if you change over to an external filter you run possibility of added moisture and ice in winter to a very sensitive air system. Could be a 1/10th of a mile increase and frostbit driver trying to make a repair on the side of the road.

 

I don't believe it would make too much if a difference myself. But, you may want to read up on a little item that is called a turbo cut off valve that is built into air dryers. It is designed SPECIFICALLY to limit boost loss due to the action of the air compressor.

 

I say to hell with it, record your findings for one week without a modification, then do the modification and record your findings for a week, report back here when you have done so. Make sure you have solid proof of your findings.

Only way youll know for sure is if you actually try it for yourself.