EGT's after the turbo

[portlandareae28]

EGT gauge is back up and running, however, the probe is after the turbo.  In my previous trucks I have been in the exhaust manifold, and 1200* was the peak I ever wanted to see..  My question is, because I can't move the probe before towing this week/weekend.  What temp would you guys say is a conservative number to stay at or below?

 

Thank you

[01cummins4ever]

I would not run over 900 degree max, maybe 6-700 cruising under heavy load .

you should be about 300 degree difference between pre and post probe.

[Mopar1973Man]

I've seen 500F degree difference between pre and post turbo EGT measurements one heavy loads. It would be best to just move the probe ASAP.

[portlandareae28]

****, (excuse my french) the truck is running 600* down the highway empty currently...  hmmmmm

 

[notlimah]

Hmm, that sounds slightly lower then what I get with my probe pre turbo.

 

It doesn't take long to tap a new one.

[Dieselfuture]

More load=bigger difference in probes. You'll be fine for a while just move it asap. I have both and it can be 100-600 different. 

[portlandareae28]

Where in the exhaust manifold do you guys put the probe?

 

What method do you feel is best to keep from filling the turbo with metal flakes from drilling the manifold?

[Cowboy]

If I'm not mistaken, when cummins gave the 1200°F limit, it was for post turbo like all the big rigs are setup.  

Edited June 12, 2017 by Cowboy

[Mopar1973Man]

Right in the 4,5,6 port. 

 

[Me78569]

I have not found ANY offical documents related to that 1250*f number  there was one guy on a forum that had a qouted email from a cummins engineer stating something like " well I dunno I guess I wouldn't push much past 1250*f"  

 

assuming you are not towing to low int he rpms etc I wouldn't worry.  This also assumes you are not overfueled for your air. 

[Mariocand]

[portlandareae28]

I have stock injectors and an Edge Comp that is not tapped, I can't imagine I am over fueled unless I am lugging the crap out of it.  I will keep the RPMs up and keep an eye on it.  

 

Do you guys like the greased bit? magnet on the tap? engine running, vacuum, all of the above for drilling and tapping the manifold? :-)

[Mariocand]

I personally would take the turbo off. Its not hard to do. 4 bolts on the manifold, oil drain, and seperating the downpipe.  No worries no issues, plus you get the piece of mind that nothing went into turbo. 

 

However, if that is not an option for you, then a greased bit while motor is running would be my suggestion. 

[Me78569]

Drill slowly with the motor running, most of the shavings will blow out without any issues, 

[jlbayes]

4 minutes ago, Me78569 said:

Drill slowly with the motor running, most of the shavings will blow out without any issues, 

 

Done a couple this way. Wear gloves. It gets hot lol

[01cummins4ever]

Motor off with a pencil magnet was my preferred method, although all will get the job done .

1 hour ago, Me78569 said:

Drill slowly with the motor running, most of the shavings will blow out without any issues, 

just make sure you have a new or well trusted drill bit. 

[notlimah]

I drilled mine engine off, put grease in the grooves, and pencil magnet when completed. Bumped the starter a couple times to blow any small bits through before officially starting it. Done this twice with no issues.

[Mopar1973Man]

All valid methods of drilling the manifold. I've tried them all and they all work just fine.

 

24 minutes ago, 01cummins4ever said:

just make sure you have a new or well trusted drill bit. 

 

Very good point. I've got a drill bit zipped tied to the tap and it stays as a set. Good sharp drill bit will cut much better giving a good clean hole for the tap to work in. 

[Cowboy]

If you use the engine running method, you get extra redneck points for stuffing a piece of firewood in the exhaust pipe while doing it.

[portlandareae28]

I didn't know I was supposed to ever take the firewood out????