For temp use, like for drag racing, using ice etc is used. Some people use an air/water after cooler. Spraying water on the cooler help by allowing more heat transfer to the air. I really doubt there is much difference between 90 and 100 degree air entering the air filter after it gets through the turbo and after cooler

 

I read somewhere that the "cool blue" is suppose to lower intake temp up to 10 degrees. Does anyone have one and can give us a critique.

Pete

 

Sounds like intake air temp is really not going to matter. The turbo is going to heat it up to exhaust temp or close to it. How can we keep the exhaust side of the turbo from transfering as much heat? Why don't or do they make a turbo that doesn't have the intake and exhaust against each other? You would still have to have a shaft between them but why not a space with some kind of heat sheild between them?

 

Well not sure if they have them for trucks or not (I would assume it could be done) but they do have remote mount turbos. So basically you mount the turbo in the rear of the car (or truck) and all the piping runs underneath like the exhaust, it eliminates the need for an intercooler however the distance that the pressure has to travel is quite great so that would more than likely eliminate any kind of gains anyways. Sure it would be cooler but you would have to run a lot higher boost to match the power you currently have.

 

I've always thought that it was funny how you have to use an intercooler to cool down heated intake air from the turbo. Why not try to design a turbo system that does not transfer so much exhaust heat from the exhaust side turbine to the intake side turbine. Then use the intercooler to help the engine with a cooler / denser air charge.

I think the reason they are so close together is that at the speeds they are spinning you would want as short a connecting shaft as possible. But if you could separate them a bit, add a heat shield between them and maybe separate oil lines and cooler for each that would have to help lower intake temps. Unless just the pure compression of the air heats it up so much.

Does anybody know how much heat is due to the compression of the intake charge (pre-combustion chamber) vs the turbo heat exchange?

 

That's called a supercharger.

Compressed air is heated air...very heated air. Remember in chemistry when you forced a plunger into a tube and the air compressed and super-heated and the little piece of paper in the bottom caught on fire? Well, that's the same thing that happens in a submarine at test-depth when the hull is breached. The water rushes in under such great pressure, it super heats the air, the water boils, and all the lil' guys inside implode. And all this time I bet you thought they drowned, uh? But forget everything I just said 'cause it may be classified.

 

I'm no chemist or physicist. Compressed air is hot? I've been around lots of air compressors and I never noticed the air coming out being hot and thats at much higher psi than we see on our trucks. Some of the compressors were very large industial ones probably almost as many cfm as our trucks use but no hot air was coming out of them. Is it the way that the air is compressed that makes it hot? I've heard that a motor is nothing more than a big compressor, turn off the fuel and turn it by some means and it will get hot just because it's compressing air?

 

Just think of one cylinder in your CTD as a compressor motor. At a 17:1 ratio, the cylinder temp can go from ambient to over 1500 degrees almost instantly when you start it. It's the same principle with the turbocharger, only the temps aren't quite as high. The air is pressurized so quickly that it heats up noticeably.

Most air compressors do not bring the pressure up quickly enough to notice a temp difference.

 

OK, I'll agree with that part.

 

Friction of the air on the turbine is what really causes the heat then. My dad told me about some type of dino that used a big fan to creat load on the motor. He said the fan would get red hot from the friction with the air. www.conceptsnrec.com/pdf/SpinOffsSummer03.pdf When you only have 5 to 10 psi of boost the exhaust temp is still going to be only about 6-800deg. Then the heat transfer is still the biggest heat source for the normal driving person.

 

A gasoline engine gets it's explosion in the combustion chamber from a "spark" plug (fire). However, your diesel engine gets its explosion from compressing air, which then has fuel injected into it. So you can imagine how hot this air is!

BTW, you could reaname your turbo and call it a compressor.

 

Most people understand diesel combustion on this site hopefully. The compressor or turbo is fighting air friction to make pressure hence the heat. So lets put a exhaust turbine right against the intake side that is 1500deg and wonder why my intake turbo heats the already heated compressed air some more. Kind of a oxymoron! Lets compress it and get more air but in the process heat it and make it less dense so you basically defeat a big part of why we have a turbo. Granted you will heat the air but will it be as much as it is if you could get away from the exhaust heat?

 

Look at page 2 of the web link I posted earlier. Shows a picture of what they called a Air-cycle Chiller. Looks like a turbo that is seperated? Maybe you can explain what this is Lark?

 

And all this time I thought taking waste heat and turning it into energy was a GOOD thing?

 

Now you're talking about something that is used to freeze crust in pre-baked foods. Sort of a different kind of application.