PCV help?

[GregWeld]

Originally Posted by olds

Okay, I've been trying to tell you it doesn't reduce exhaust temp. And for the last time tell me how this reduces exhaust gas temperatures?

Here's what you can do if you don't believe me, take a nice high dollar probe and stick it in your exhaust pipe, you can even use a fitting if you like. Take the temperature when the EGR valve is closed, the exhaust will be temp A.

Take the reading when the EGR valve is open, it will be temp A.

Recirculating gases and reducing pressure out your exhaust does not cool it in any way.

@Olds --

Let's try this one last time... because EVERYTHING I read about EGR systems say the same thing - they are present in diesel and gasoline engines because THEY REDUCE TEMPERATURES... Whether you choose to believe it or not matters little to me. I never knew what they were for until this thread started - and you started to argue about it. So... like I always do... I went out and researched what this system does.... and I learned a couple of things. #1 is that this system is in place to REDUCE TEMPERATURE... #2 is that, as usual, I never trust what anyone blindly states on the internet - and especially in a forum... because many people just think they know - and often times they're just plain wrong.

So here's how the EGR system reduces temperatures :

Exhaust gas recirculation

In internal combustion engines, exhaust gas recirculation (EGR) is a nitrogen oxide (NOx) emissions reduction technique used in most petrol/gasoline and diesel engines.
EGR works by recirculating a portion of an engine's exhaust gas back to the engine cylinders. Intermixing the incoming air with recirculated exhaust gas dilutes the mix with inert gas, lowering the adiabatic flame temperature and (in diesel engines) reducing the amount of excess oxygen. The exhaust gas also increases the specific heat capacity of the mix, lowering the peak combustion temperature. Because NOx formation progresses much faster at high temperatures, EGR serves to limit the generation of NOx. NOx is primarily formed when a mix of nitrogen and oxygen is subjected to high temperatures.

So I think that TEMPERATURE REDUCTION is mentioned TWICE in just this one description of it's function. Vacuum isn't... that seems to be just a controller function and varies widely depending on the system.

Class is over on this one.

[olds]

Greg weld -

As I was saying, and you haven't answered and never will because you found 'temperature' and 'egr' in the same sentence and blew a load, that an EGR valve lowers temp of exhaust

The amount of energy used in combustion is determined by your ignition system. That doesn't change with the opening of a valve or the amount of air/fuel ratios that are given to spark. If there is no change in E input, the exhaust gases are the same temperature as before.


Let me give you the reason why I started getting on to all you:

I'm not the one who thought an EGR valve is directly related to exhaust temperatures.

As I've tried to explain and you simply can't understand no matter how much you google, cuz you won't stop and think...

there is no effect on the temp of exhaust gases with or without an EGR valve.


You can wrap your exhaust in dry ice and intercool it for all I care and you'll still have the same emissions.

Bunch of immature idiots on here that cant think for themselves, later. doors don't hit me in the ass

[GregWeld]

Originally Posted by olds

Greg weld -

As I was saying, and you haven't answered and never will because you found 'temperature' and 'egr' in the same sentence and blew a load, that an EGR valve lowers temp of exhaust

The amount of energy used in combustion is determined by your ignition system. That doesn't change with the opening of a valve or the amount of air/fuel ratios that are given to spark. If there is no change in E input, the exhaust gases are the same temperature as before.


Let me give you the reason why I started getting on to all you:



As I've tried to explain and you simply can't understand no matter how much you google, cuz you won't stop and think...

there is no effect on the temp of exhaust gases with or without an EGR valve.


You can wrap your exhaust in dry ice and intercool it for all I care and you'll still have the same emissions.

Bunch of immature idiots on here that cant think for themselves, later. doors don't hit me in the ass

@ OLDS

Your valve is stuck in the closed position... and that just can't possibly have a good outcome.

EEEEEEEEEHHHHHHHHHHHHAAAAAAAAAAAAAAA

[Y-TRY]

I'm kinda getting in on this late, and only read the thread hoping to get an answer to the original PCV question but...

It sure looks like the basis of olds' argument is the idea that 'combustion temps' and 'exhaust temps' are different and completely independent of the other. Is that what you are saying olds? I absolutely disagree with that claim.

gregweld has provided documentation that combustion temps are lowered through the introduction of recirculated exhaust gasses, via the EGR valve.

A lean mixture=high combustion temps= high exhaust temps. The opposite is certainly true. The recirculated exhaust has the effect of fattening the mixture without introducing more fuel. Rich mix= cooler combustion temps= cooler exhaust gas. I'm just wondering where that's losing anyone.

[wedged]

Originally Posted by GregWeld

Class is over on this one.

It certainly is. I just realized how much money I wasted on school, the time wasted of having 20+ years of experience, having been a NYS emissions inspector, the time & effort spent to become an ASE Master Tech with Advanced Engine Performance Specialist certification... only to find out that the SAE, all of the automobile manufacturers and countless scientists around the world are all wrong or have been lying to us...

Gregweld- I'm not sure if it is still in print, but there's a really good,(but apparently fictional) book about internal combustion engines you might want to try to find. It's called Internal Combustion Engines and Air Pollution by Edward F. Obert. It's kind of old and very technical, but I occasionally grab it out of the closet and read portions of it when my mind wanders.