Where to put EGT probe??

[Briman]

So no one has taken a ray gun (infrared thermometer) and checked out the different spots to check temp? Trying to read heat patterns visually is not the kind of info that I would base my decision on. Actually, I can't do that with mine, its all the same rusty color. Those guns are not that expensive any more. Some day I'll have to get one. I'm putting mine in the back (4,5,6,) spot just above the turbo. I imagine it's a lot easier if you take out the wheel well liner.

 

[JThiessen]

Well, I may have been too general in my use of terms regarding surface temp. I didnt mean to imply that surface wouldnt be a good indicator of what lies behind it. But just for the sake of discussion (and to keep you out of your wifes hair while your laid up!), like you stated - surface temps are also influenced by conditions on the outside, and discoloration is also greatly influenced by elements on the outside. Looking at mine, the "high heat" spot could also have been caused by water dripping down off of the cowling. Matt400 may have part of it also in that heat soaking (I'd imagine this would occur due to longer heat dissaption times after shutdown) may affect the outward appearance of the manifold. Why some areas of the manifold would take longer, I dunno...

I made my location conclusion based on a desire to know the average temp of the air entering the turbo, not just the hottest single contributor as it exits the port. BUT!!! It would sure as heck be easier to drill right off of that #3 port.....



Hey man - get well soon! (but keep the good info coming!)

 

[Matt400]

Originally posted by Briman

So no one has taken a ray gun (infrared thermometer) and checked out the different spots to check temp?

I have one of those so just for kicks I will point & shoot various spots, maybe tomorrow.

 

[JRMora]

Originally posted by JThiessen

I'm just getting ready to drill mine, and thought I'd chime in here - the hot spot on my exhaust manifold is definitly right off the #3 cylinder prior to the the main collector. I wonder why we are seeing differing patterns here... ... .



My next question is do you ALL have 90 degree drill motors????? There's no way my cordless or my 1/2" will get in there..... gonna have to check out the air motors at work... .

Just to add my 2¢ worth - I pulled the wheel well liner (didn't have to remove the wheel), but I still had to use a right angle attachment on my drill to get a good straight shot at the manifold. I bought a cheap right angle attachment from Home Depot that is geared 2:1 or ½:1 and ran at the slower speed. Cost me $25. I'll probably never use it again, but... BTW I was quoted $120 to have the manifold drilled and tapped. It took me a total of 90 mins (my first one). Doing it again, I could do it in 30-45 mins.



Juan

 

[JThiessen]

Just finished mine. I used a regular air motor that I got from work. It was a tight fit - even cut the drill bit in half to give me a little more room. I started at about 6:30 and finshed including hooking up and routing the wire across by 7:30. I started the engine and let it idle up to about 140 degrees, and the needle hasn't budged off the 0 mark - should be sitting around 250 ambient temp I'd think. I'll take it for a test drive to the Diesel shop. I need an extension for the boost line anyway. And if its not working by the time I get there, maybe they can help me trouble shoot it.

 

[Buzzer]

I took an infrared gun to mine to look for the hotspot in the manifold and found the rear of the mainifold just above the turbo from clynders 5 and 6 was the hottest but only by a few degrees overall. Probably because that part of the manifold is the shortest to exit. Assuming all cylinders are equal I would imagine the spot in the picture above around cylinder 3 or 4 would be as good a place as any to put the probe. Certionly the easiest. JMO.

 

[Matt400]

Ok... I zeroed my SPA gauge and drove to work today, hit 1150 deg. at one time. Hopped out and noted these measurements at idle:

374 deg at each port, 420 where the probe is on DLeno's pic and 450 where my probe is here:

#ad


As it was cooling down temps were changing quickly so those numbers are an approximate.

 

[Yo Hoot]

Well it looks like nobody made the same mistake as me. I studied all the posts before doing the job. I've installed these before in Dmaxes.



Looking at the above picture I decide to go into the side the same way.



BUT... and a BIG BUT... I wanted it to look nice and centered. Guess what... there's a rib in the middle. I drilled and drilled than kicked myself, tapped and plugged and drilled again along side.



I hope you all read this so nobody does the same thing.



Than on the same night... I'm fishing the braided stainless steel jacketed thermocouple wire to the passenger side of the firewall. All of a sudden I see smoke :{ I accidentally layed the braided wire on the positive battery post that happen to be right there ... phew... close call. Burned my hand but saved it.



No a good night but all is well.

 

[Matt400]

I hate it when that happens!

 

[jsimpson]

Doesn't it bother anyone that placing the probe in the hottest part of the manifold FURTHER restricts flow in that cross-section? I'm leaning toward the number three cylinder location.