8.3L Cummins Transplant

It's a lot lighter to lift without that mammoth ass head on it. :D

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I learned something the other day from a guy. He said that the bigger trucks will supply the compressor with charged air from the intake manifold. That way it is filtered and pressured and the air tank will replenish faster while driving. Do compressors really do ok compressing already compressed air? Does that now d1ck with how it runs?
 

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4x4dually said:
It's a lot lighter to lift without that mammoth ass head on it. :D

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I learned something the other day from a guy. He said that the bigger trucks will supply the compressor with charged air from the intake manifold. That way it is filtered and pressured and the air tank will replenish faster while driving. Do compressors really do ok compressing already compressed air? Does that now d1ck with how it runs?
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Most holset compressors are turbocharged, they feed off the charge air cooler pipe.
 
will24 said:
Most holset compressors are turbocharged, they feed off the charge air cooler pipe.
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I am running the charge air cooler pipe delete kit. No cooler. LOL

I have heard about some sort of air/water cooler that sets up in the intake manifold. How does that even work? Is it separate water from the block water or what?
 
DionysiosA76 said:
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4x4dually said:
The hell is that? LOL
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That is an 855 Big Cam. Not sure why we have just a picture of it...

4x4dually said:
It's a lot lighter to lift without that mammoth ass head on it. :D

attachment.php



I learned something the other day from a guy. He said that the bigger trucks will supply the compressor with charged air from the intake manifold. That way it is filtered and pressured and the air tank will replenish faster while driving. Do compressors really do ok compressing already compressed air? Does that now d1ck with how it runs?
Click to expand...

That is backwards of how I know them to work.

In a semi truck the most air pressure in this system is 120 psi. Since the air compressor is gear driven it can't just shut off after it reaches 120 psi like your shop compressor would. Once the pressure in the system gets to 120 psi the governor dumps the air into the intake manifold instead of the air tanks.
 
The governor opens to supply air to the unloaders, at that point the air is basically passed back and forth between cylinders on a two cylinder compressor
 
4x4dually said:
I am running the charge air cooler pipe delete kit. No cooler. LOL

I have heard about some sort of air/water cooler that sets up in the intake manifold. How does that even work? Is it separate water from the block water or what?
Click to expand...

No, it cools the air to just above engine temp. Basically, it's better than nothing, but not as good as a charge air. Used a lot on AG and Industrial, since it was easy to package in the old days. Now, about everything has a charge air cooler and a big fan.

There should be a plug in the intake manifold you can knock out to get it for your air compressor. I'll go see if I have any engines left with the compressor on them to get you a picture.

Chris
 
Thanks for all the info.

Not sure why "CumDizle" dumped a big cam in here....but whatever. LOL
 
Not that it matters but... feeding the compressor from the intake charge is a power robber. :)
 
Snedge said:
Not that it matters but... feeding the compressor from the intake charge is a power robber. :)
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Well, that's why I asked. It seems it would lower boost while not unloading.

I'd rather have power than more air. It's not like I'm on grades that I use a butt load of air. And outside air would be denser and more cooler...would it not?
 
4x4dually said:
Well, that's why I asked. It seems it would lower boost while not unloading.

I'd rather have power than more air. It's not like I'm on grades that I use a butt load of air. And outside air would be denser and more cooler...would it not?
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147669S Is the Fleetguard part number for a filter canister to bolt up directly to the intake. It has a little baby air filter in it.
It's worth a couple pounds of boost. Not a big deal in your application.
 
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Snedge said:
Not that it matters but... feeding the compressor from the intake charge is a power robber. :)
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Feeling better today?



Never thought about it dropping boost that much, kinda surprising. If they make a filter, just go that route. Simpler.
Chris
 
Signature600 said:
Feeling better today?



Never thought about it dropping boost that much, kinda surprising. If they make a filter, just go that route. Simpler.
Chris
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Hell, it seems to me to just run a hose to the intake is way easier....but I'm hoping for 600hp so...:hehe:
 
Snedge said:
No. Just better enough to be here. Thanks for asking.
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Didn't know you felt bad, Jeff. Sorry to hear. The wife has been coughing since a week ago Monday and hasn't slept much since. The two kids are coughing also. I'm the only one that hasn't got down with it. Praise the Lord, but I feel sorry for them. I'd take it over the kids having it.

Get well soon!
 
Its a little off topic and I dont want to get sidetracked but I'd love to see dyno numbers on a side by side comparison of an engine with no charge air cooler, an engine water to air aftercooler, air to air aftercooler and a ice water to air aftercooler.
 
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