EGT probes

[RICE RACING]

Finished RHT fitment

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[rac]

very nice work! that's exactly what I was up to (CHT)... decided to not bother with it for now but might go back to it one day.
out of interest, are you using a thermal paste or similar between probe and head?

[RICE RACING]

very nice work! that's exactly what I was up to (CHT)... decided to not bother with it for now but might go back to it one day.
out of interest, are you using a thermal paste or similar between probe and head?

thanks.

I've got it as a slightest clearance fit at the sensing tip and outer jacket on the necked down section if I put anything in there it would cause hydraulic and not allow it to be pushed in. Will see how it goes, I know already what it will read and it will show up rotary turbos fundamentally as the total shit box's they are known to be thus no one uses them in any 'endurance' form at high specific power to be competitive against a normal engine

[rac]

yeah I was thinking smearing the side rather than the tip and rotate it gently in to allow excess to be pushed out

the data you get will be interesting with and without WI, might help optimise WI volume. and also will be interesting if you can get a decent AFR character curve out of them (CHT v AFR) in steady state conditions, something similar to which I assume you did with the egts for cylinder trimming purposes. that's what I had in mind for them anyway.

[RICE RACING]

Found another great use for my fast response thermocouples, very fine knock/combustion control.

Still doing the validation tests, but so far there seems to be one situation I have found where they have the ability to determine this specifically where there are many smaller than normal knock severity threshold events that lift the 'average' knock seen on a cylinder and show an increase in power output with a corresponding lowering of EGT (best shown as rate of change or negative values) which is indicative of the heat flowing into the combustion chamber parts rather than out the exhaust stage.

This particular one shows up with high thermal loading in 4th gear only and sustained times on load (not normally seen on a dyno sweep test pull). Such a simple sensor, but so very useful and a great cross check input, they really should be fitted to every engine!

[RICE RACING]

Well well, here I was thinking I was onto something only 40 years too late !

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[stevieturbo]

Damage produced in less than one minute ?

Well yes....I'd say less than a second or so lol

Presumably their tests are on a static low speed motor ?

[RICE RACING]

Damage produced in less than one minute ?

Well yes....I'd say less than a second or so lol

Presumably their tests are on a static low speed motor ?

Their test is 5000rpm constant speed, pretty good test actually. They use rotary encoder pressure transducers in cylinder along with acceleration sensors on head and EGT probes.

In my own case using same set up minus the pressure transducers I have seen same drop in EGT, no noticeable loss in engine power, but an increasing 'average knock' but not enough to trigger the normal threshold as average is increased, with resultant drop in exhaust gas temperature. Seen this in very quick time (see previous tests by me of latency) and over a time sample ranging from a second to multiples on a transient WOT test in real world acceleration.

This pattern of increasing average knock but not enough to trigger an event threshold with this hindsight is something I found on a raft of different engine types (all recorded on these ECU's) and something I struggled to explain before but with the EGT probe it is now backed up. Glad I found this as it makes it nice to see someone else found the same things!

In the same report they do go on to say that the trace knock is sometimes hard to differentiate but it always shows up quickly on the thermo couple fitted in the exhaust. I did re read it a couple of times and they fitted the same probe to do CHT but it was not as fast however eventually it did show the pressure waves modifying the thermal exchanges at the walls of the combustion chamber and thus the heat carried away but the cooling system.

[RICE RACING]

Little update:

*Diesel* Having a talk one day (non automotive) with a few 'mates' led to talk of Pyro probes and how they don't last in certain applications especially when pre turbo. I listened for a long time, and one of them asked me a question, the next day I brought in a few of mine. Bloke fitted it up and as of last week had covered over 7000km running it pre turbo at ~800deg C. "Super responsive" (unlike other Diesel probes used prior) and so far no issues with regards to durability, he absolutely loves it.

p.s. They were using some 'rubbish' off E-Bay and another was a 'big brand' with similar quality, both suffered from poor response + under reporting of temperatures and ironically to go with that they lacked durability "burning up in short time"

[RICE RACING]

Here is what 1160 deg C pre turbo EGT does to a Garrett turbine wheel
All 6 donmega Type K thermocouple probes are still working as new, despite small bend from the abuse

Great way to test durability though

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