HighTen

I've searched the forums about this, but haven't found an answer.

I have the Autometer Ultralite Pyro kit and I plan to put the pyro sensor a few inches above the turbo in the vertical section of the manifold on the left side so it measures the hotter 3 cylinders. The probe requires a 1/8 NPT thread into the manifold. Question: will the probe be long enough to bottom out in this location if I tap too far?

Just want to do everything right! Thanks.

Big Bob

There is a sleave around the probe. It is hard to move, but you need to move the sleave to adjust the probe depth. This will raise or lower the location of the end of the probe. The end of the probe should be in the center of your exhaust manifold.

Dodgezilla

Plus, you have to tap all the way through the manifold. You can't tap too far.....

Shovelhead

This is a picture of an Isspro Adjustable length thermocouple.


It allows you to center the tip of the probe in the exhaust runner.

I'm sure Autometer has something similar.

Just be sure the tip isn't touching the bottom of the runner as this will cause the tip to fail.

HighTen

Can anyone elaborate on adjusting the probe depth?

I'm looking at my Autometer probe and I can't seem to figure out how there's any kind of adjustment build into it.

Big Bob

If you loosen the nut from the fitting that goes into the manifold. You should be able to see the nut and the fitting that goes into the manifold in the picture previously posted, under the nut there is a compression sleave around the probe. That sleave is usually pretty hard to move, but it slides up and down the probe. You adjust the depth of the probe by moving that sleave. If you have already tightened the nut to the fitting, you may have already compressed the sleave around the probe, this will make it even harder to move the sleave, if it will move at all.

HighTen

Thanks for the help. It looks like my Autometer probe doesn't have an adjustable sleeve though.

Big Bob

Could it be a possibility that they left the sleave off, maybe that's why you can't adjust the depth.

HighTen

The probe looks right and complete. It just has a ring (that's not movable) that the two parts bump up against and screw together. I'm not too worried about it bottoming out because my probe is a lot shorter than the one in the picture Shovelhead posted. My probe only sticks out 1" past the fitting that you screw into the exhaust manifold.

Maybe someone else with an Autometer pyro can comment on their probe being adjustable or not.

Gypsyman

If the probe tip only sticks out about an inch you should be ok. Take the tapping slow and try for three to four full turns in. The fitting doesn't and shouldn't be bottomed out as the threads are tapered and will get tighter as you screw it in. The new X-monitor and TST probes are like what you are describing. They are a fixed length with a compression capture ridge. If you like you can shoot me a pm with your e-mail address and I'll send you a close-up photo.

Richard

2500CTD

I asked the same thing on my truck. I used a cut off wheel too barely cut throught the compression ring, and then just put a new one on and adjusted the probe length to where I wanted it. I put the tip in the center of the exhaust port.

Gypsyman

I understand what the other guys are talking about but I believe that he is talking about a totally different style of probe. Like the units that I have now. The style I'm speaking of has raised ridge molded right into the probe body itself. You slide the probe in until it stops and the top nut just pinches the ridge between the bushing in the manifold and the nut. No "compression ring" is used. This style is non-adjustable and preset for depth. I'll see if I can find a picture for reference.

Richard

nickleinonen

my autometer pyro probe wasn't adjustable... it is only adjustable if you use the band clamp mounting method...

yes you can... with pipe threads [or any other tapered thread] you can tap too far. if you tap it too far, your fitting will go deeper into what you tapped the threads in. if you go too far, you will never get a proper seal from the threads...

when i first got my autometer probe, it looked like it was too long, but if you assemble it and see how far it extends past the end of the pipe threads, the depth of the probe is ok...

Nascarcamper

While we are on the subject or EGT probes. Can I hook up two gauges to one probe?? I'm getting ready to install a TST PMCR with gauges, I already have gauges, can I hook two together off one probe?

HighTen

Yes, you've got it! I have that kind of probe that's not adjustable.

What 2500CTD said sounds like a really good idea. I might try doing that. I just don't know where to get a compression ring to replace the one I grind off.