DaveBen
SDD Senior Member
If you are paranoid about it you can add a switch and 7 more probes and monitor all cylinders, with a rotary switch. You will only see one at a time.
Dave
Dave
Question EGT temps, what's high?
- Thread starter sailorb
- Start date
rammertide07
Full Access Member
A representative temp of the EG's, from all 8 cylinders.. taken at, or near, the exit point (Turbo) has always seemed to provide a more factual temp, than a temp reading with about, 50%, of the actual temps being created.
BUT... to each his/her own.. on this recurring issue ?
Joe
Some of us 'Ol Guyz ain't inta Theory stuff
Yea...I'm more into the educated guess. Thats why I only have one egt probe. Aren't the readings off by as much as 500* after the turbo? Aint the engine block cemetrical anyways and both sides should be making the same amount exhaust/power/temp?
rammertide07
Full Access Member
The EGT probe location ? IMO, BOTH of the popular locations are completely acceptable, and are accepted industry wide. But Wherever [you choose] to have it.. Ya Just simply need to pay Attention to what the EGT gauge is telling you. Set a personal High Limit temp.. then shift gears, slow down, git yer foot out of it... or whatever... to NOT go over that personal limit. Mine is 900ish degrees.
If the 2,3,4 500* temp dif were true and factual ? I should'a hadta pull piston parts outa my Hood.. and Teeth.. Many, Many times, Years, Miles and 3 truck ago....
What's the highest egt's you see if you get on it?
JimmyDee
God Bless America
Post turbo temps have little or no correlation to the piston temps. Yes, it will rise and fall with the actual piston temp but the turbo uses up a lot of the temperature or BTUs to produce the boost pressure and there is a significant temp drop from one side of the turbo to the other. The amount of temperature drop is dependent on the amount pressure the turbo is producing for the boost.
There will be a different temp drop and when the turbo and engine is working the hardest, the temperature drop will be the greatest. A post turbo reading will be a wild guess at best as to what the internal engine temps are. There will be a slight drop in temp from the piston to the exhaust manifold but it is insignificant to the reading.
You will start melting the pistons at about 1250 F - 1275 F so I have my defueling set at about 1225 on my EDGE Juice with Attitude. One has to remember that equipment we use to read the exhaust temps can be off by several degrees so it is important to be on the conservative side when setting a temp alarm or the automatic defueling if you have that kind of equipment.
Some of the drag racers have reported exhaust temps that have exceeded 1400 F for a very short period of time with no damage but pulling a trailer up a hill for a longer period of time with that kind of temp, you will be rebuilding an engine.
Jim
There will be a different temp drop and when the turbo and engine is working the hardest, the temperature drop will be the greatest. A post turbo reading will be a wild guess at best as to what the internal engine temps are. There will be a slight drop in temp from the piston to the exhaust manifold but it is insignificant to the reading.
You will start melting the pistons at about 1250 F - 1275 F so I have my defueling set at about 1225 on my EDGE Juice with Attitude. One has to remember that equipment we use to read the exhaust temps can be off by several degrees so it is important to be on the conservative side when setting a temp alarm or the automatic defueling if you have that kind of equipment.
Some of the drag racers have reported exhaust temps that have exceeded 1400 F for a very short period of time with no damage but pulling a trailer up a hill for a longer period of time with that kind of temp, you will be rebuilding an engine.
Jim
JimmyDee
God Bless America
I guess I just don't see what is so funny and what should you have known better about. I see no earlier post by you. If my information is incorrect, I sure will stand to be corrected. My information comes from years of driving a diesel and much reading about the subject from many sources. Maybe I should run out and install a thermocouple in the post turbo exhaust.
Nuf said by me
In the 10 years I have been on the Diesel Stop and some 5 years here, I have never have had such a response as this. If I said something incorrect, I would have expected a knowledgeable response but not to be mocked by an individual that is also a member here.
So have a nice day.
Jim
rammertide07
Full Access Member
x2...THANK YOU SIR!!!! I was trying to make a similar post on the same issue but I could not word it any better than you did. Joe made a pretty slick post to me that I didn't appreciate...especially after giving an honest answer to his his question. Joe edited the original post but I still got it in an email...
---End Quote---
I don't care for "Should Be" things
This probe location debacle has been around for Years & years, on many sites "rammer". Fits right in there.. with the K&N air filter, the Fram oil filter, Oil brands, Tire brand, style & size.. On & On. In the end, it's up to each one of us to simply... make our Own choices. ('Ol guy stuff
)But to say.. If you install "this" there, use "this", don't use "that" brand.. your engine, turbo, tranny or tires *WILL* Explode is... Without Merit.
The EGT probe location ? IMO, BOTH of the popular locations are completely acceptable, and are accepted industry wide. But Wherever [you choose] to have it.. Ya Just simply need to pay Attention to what the EGT gauge is telling you. Set a personal High Limit temp.. and shift gears, slow down, git yer foot out of it... or whatever... to NOT go over that personal limit. Mine is 900ish degrees.
If the 2,3,4 500* temp dif were true and factual ? I should'a hadta pull piston parts outa my Hood.. and Teeth.. Many, Many Years & Miles ago....
***************
This is a forum for us to help each other out and give advice. That doesnt mean you have to you have to like, agree, or take the advice. If anything have a conversation that reflects that you have some intelect and the ability to reason with one another.
Maybe I'm off here but I'll jump. One of the other big reasons of also watching your egt is the cracks that can happen between exhaust valves on the last two cylinders. This happen when the heat of the exhaust gets hotter as it move to the back of the headers. Headers are a bad setup and are one of the problems with the 6.0 high EGT. Just my 
rammertide07
Full Access Member
Maybe I'm off here but I'll jump. One of the other big reasons of also watching your egt is the cracks that can happen between exhaust valves on the last two cylinders. This happen when the heat of the exhaust gets hotter as it move to the back of the headers. Headers are a bad setup and are one of the problems with the 6.0 high EGT. Just my
Not an answer to your question (not too knowledgeable on the 6.0's), but do 7.3's have headers? I don't think they do....but I didn't think any diesels had headers unless it was aftermarket.
rammertide07
Full Access Member
I'll be politically correct "exhaust manifold"
Ohhh...so header=exhaust manifold?