Engine/Transmission (1998.5 - 2002) Pre - Post turbo / forward or back

[richardleonard]

I find it interesting reading all the posts about mounting the temperature probe pre or post turbo. There is also some indication mounting the probe so it monitors the rear cylinders since the manifold is split at that point. My question is why haven't the more aggressively gauged folks mounted a 2nd pre turbo probe to monitor the temps from the front cylinders in addition to the rear cylinders and the post turbo temps. That way everything would be completely covered.

 

[B.G. Smith]

Pre-post-multi

Good idea Richard, why not mount one at each cylinder exhaust (I've read of these on bigger engines) then you could tell what each cylinder is or is not doing. bg

 

[richardleonard]

Now were talking

Yes i agree why not every cylinder, lets see not - 3 westec dual pryo gages plus an after turbo gage all on the passinger side piller...

 

[Oil Burner]

good idea on mouting the gauges on the passenger side a-pillar. That'll give the passenger something to do... . monitor all 6 cylinder temperatures at the manifold!

-Jason

 

[Steve St.Laurent]

Here ya go, monitor all 6 - http://www.insightavionics.com/pages/610.html



#ad

 

[GIT-R-DONE]

How much for that one, Steve ?

 

[Steve St.Laurent]

Oh, only about $1500 for the instrument - then you add the sensors! That's an engine monitor for aircraft use - although it would work fine on our engines as well.

 

[GeneralMachine]

Something Else To Save Up For

I like that too Steve, Cat gas engine's G-399 has 16 cylinder's one pyro with a selection switch, you can dial up what ever cyl you want to.

 

[MUDDY]

Originally posted by richardleonard

I find it interesting reading all the posts about mounting the temperature probe pre or post turbo. There is also some indication mounting the probe so it monitors the rear cylinders since the manifold is split at that point. My question is why haven't the more aggressively gauged folks mounted a 2nd pre turbo probe to monitor the temps from the front cylinders in addition to the rear cylinders and the post turbo temps. That way everything would be completely covered.

as i didnt trust just 1 guage i added another and i wanted frnt 3 and back 3 monitored. added 2nd guage and it was 200 degrees off. replaced it and new guage was within 20-40 degres on the front compared to the back. im glad i didnt get the defective guage 1st as it was reading low

 

[richardleonard]

Originally posted by muddymess

as i didnt trust just 1 guage i added another and i wanted frnt 3 and back 3 monitored. added 2nd guage and it was 200 degrees off. replaced it and new guage was within 20-40 degres on the front compared to the back. im glad i didnt get the defective guage 1st as it was reading low

Himmmmm,,,, now that makes me wonder just how many folks are running around with guages which are off a couple hunderd degrees and would that cause a problem for them thinking they are barely getting by with high EGTs when in actuality they are over the limit???



Muddymess,, just how did you know the 1st guage was accurate?

 

[RowJ]

Nothing to do with EGT's

Saw Steve St. Laurent's name above (and for first time yseterday when web site was down, so thought I would go public with my thoughts.

Steve, Great Job as web Master! For a multi-Linked, interactive and fairly involved Web Site the speed and accuracy on TDR.com is excellent.

My work place is in the country and has to live with a dial up modem system, never faster than 24 kbps. I wish all the web sites I deal with were as fast and smooth running as this one. Thanks & Cudos!

 

[clem]

Pre or Post Turbo

I asked City Diesel about that. If you put a probe Pre Turbo the readings are better,but if a probe comes a part it goes through the TURBO. So I put mine after the Turbo and get lower readings, but add a couple degrees in my head. Works for me

 

[KatDiesel]

Re: Pre or Post Turbo

Originally posted by clem

I asked City Diesel about that. If you put a probe Pre Turbo the readings are better,but if a probe comes a part it goes through the TURBO. So I put mine after the Turbo and get lower readings, but add a couple degrees in my head. Works for me

Hope your range of a "couple degrees" goes 300° to 600° difference.

 

[MUDDY]

Re: Re: Pre - Post turbo / forward or back

Originally posted by richardleonard

Himmmmm,,,, now that makes me wonder just how many folks are running around with guages which are off a couple hunderd degrees and would that cause a problem for them thinking they are barely getting by with high EGTs when in actuality they are over the limit???



Muddymess,, just how did you know the 1st guage was accurate?

richard,



i dont know it be acurate but temps are mre realistic than the 2nd guage,,,,,,,,and the 3rd guage is really close to the 1st.



i decided to use a backup when i read about the individual towin a 5er w/ comp on 5x5 and not hardly reaching 1300 degrees on long hill i too,wonder how many are drivin around with guages that are off enough to be dangerous



i sure feel more at ease having a 2nd pyro

 

[Dkevdog]

Re: Pre or Post Turbo

Originally posted by clem

I asked City Diesel about that. If you put a probe Pre Turbo the readings are better,but if a probe comes a part it goes through the TURBO. So I put mine after the Turbo and get lower readings, but add a couple degrees in my head. Works for me

How many trucks do you know of to have this actually happen???

 

[clem]

Re: Re: Pre or Post Turbo

Originally posted by Dkevdog

How many trucks do you know of to have this actually happen??? [/

B]

I just don't want it to be mine

 

[Steve St.Laurent]

Aircraft run K type thermocouples pre-turbo (they call em TIT gauges - turbo inlet temp) at 1600+ degrees all day long with no problems - FAA approved. There has NEVER been a post on the TDR about a thermocouple coming apart and going through the turbo and I have never heard any of my pilot friends having had one let go either. Believe me - if it was a big concern the FAA would not allow it.

 

[RustyJC]

It is also standard practice on large industrial engines to supply individual power cylinder thermocouples at each cylinder exhaust elbow as well as thermocouples at each turbocharger inlet. Post-turbo thermocouples are generally not provided unless the customer has some device (e. g. , waste heat boiler, catalytic converter, etc. ) downstream of the turbocharger where post-turbo temperature is critical.



Rusty

 

[clem]

Originally posted by Steve St. Laurent

Aircraft run K type thermocouples pre-turbo (they call em TIT gauges - turbo inlet temp) at 1600+ degrees all day long with no problems - FAA approved. There has NEVER been a post on the TDR about a thermocouple coming apart and going through the turbo and I have never heard any of my pilot friends having had one let go either. Believe me - if it was a big concern the FAA would not allow it. [/Q

The Airforce pays alot more for there EGT probes. The likes of we don't want to pay for. I don't think the FAA would let you install one of the probes we use. It's how well the probes are made is the problem.

 

[Steve St.Laurent]

I wasn't talking about the air force (which btw does not have to follow faa approved parts authorization) - I was talking about aircraft as in civilian. If you look out there you will find that the construction and pricing is very comparable actually and if you wish you could buy a thermocouple with FAA PMA approval. For example go here - http://www.universal-co.com/probes.htm and then look at the pricing for the M-111 K type thermocouple at http://www.universal-co.com/order_form.asp and you'll find that it's $64. 00 and has FAA PMA approval (meaning it is approved for installation in aircraft) which you can compare to isspros at http://www.issproinc.com/Home/webstore/products/p_t_13.html which is $50. 25 . No one EVER has reported a thermocouple going through their turbo in the TDR magazine or on the website - it's something that I wouldn't even consider in my reasonings - JMHO