Pyrometer placement

[YachtTech82]

Where is the best place to take EGT readings on the 7.3? The truck currently has a Pyro and the probe is just after the Y-pipe. I get why it was place here but it seems way to far away from the cylinder to be of any use. I have always drilled a manifold? Tapped and installed there on turbo engines but these? Where is your Pyro on a non turbo 7.3l IDI?

 

[rreegg]

I don’t worry about a pyro on my NA. If I was in your situation I’d run the existing plug as it can’t make more than like a 10-20* difference max? I respect however you want to handle this though. I’m definitely curious on na egts though. Is the fuel turned up? Surely others will have better location recommendations

 

[IDIBRONCO]

I don’t worry about a pyro on my NA.

This is wrong. A pyro is just as important, if not more important, on a N/A engine than it is with a turbo. The reason for this is because a turbo will provide more air to burn off fuel. Unburned fuel equals higher EGTs. A N/A engine doesn't draw much air into the intake to be burned compared to a gas engine. There's other reasons for high EGTs as well, but this is a big one.

it can’t make more than like a 10-20* difference max?

This also is wrong. I've seen people say that it makes a *100 difference (lower readings) with a pyro probe located right before the turbo. The most accurate place is within 8" of the head. It cab be in the manifold or in the exhaust pipe right underneath the flange that connects to the exhaust manifold.
Location and cause of high EGTs aside, a Pyrometer is one of those gauges that I feel is a "must have" for a diesel engine.

 

[Clb]

This^^^^
Behind #8 is often used for accuracy, right after the turbo on the downpipe will read higher than piston crowns, your location will read much cooler than piston crowns...

There is a stickie somewhere here..

 

[Nero]

This is where I put mine, drivers side. I did it when I had my heads off, but it can be done in chassis.

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[DirtyWood]

I did mine in chassis between 6 & 8 or so.

 

[YachtTech82]

Ok thanks for the input. Manifolds are coming off anyway to reseal so I guess it will be drill and tap time.

 

[Kdo58]

Cdd recommends it in the cross over pipe, I put mine in the exhaust manifold, like the others

 

[Nero]

You want to take your measurement at the hottest point, because the temp you want to see is what our very aluminum pistons see. Hottest point is going to be right at the head port. The Y pipe I'd assume will have more even flow, but I'm sure it won't be the hottest point.

 

[IDIBRONCO]

I don't think that he meant the actual Y pipe for the turbo. I think he meant the crossover pipe.

 

[Nero]

Oh gotcha. I had mine in the crossover at first, then the manifold. No idea if there was a difference. I had also wrapped my crossover pipe.

 

[YachtTech82]

I bought the truck with some brand x pyrometer and who ever installed it put the probe in just after were the crossover pipe Y's into the main pipe. So it's probably 2+ feet from the cylinder, not exactly accurate for damage control. I was hoping to get to the manifolds today but didn't get as far as hoped on other projects.

 

[BerserkrBuilds]

Just a little info for you OP.

I did the same and recently moved mine pointed directly at exhaust on cylinder 8.

Temp differences were roughly 100-150 degrees lower at the Y pipe before the turbo than they read now. This is towing, driving , cruising, everything.

So if you leave it there I honestly wouldn’t worry about moving it, it’s so easy as it is. A lot of gauges have the “red area” starting at 1100 anyway.. just my thoughts!

 

[u2slow]

You can put in as many pyrometers as you like. Large engines often have one per exhaust port, plus pre and post turbo.

 

[Cubey]

The little silver pipe nipple looking thing on the downpipe manifold is the place where Banks put the pyro probe on early kits. I was in the middle of replacing a broken gauge/old probe, hence it not being there.

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