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Old 05-08-2009, 06:53 PM   #1
williaty
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Default What are the Highest Worst-Case EGTs for NA 2.5L?

About 2" from the flange, what are the highest possible, worst case, exhaust gas temperatures than an NA 2.5L might experience?
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Old 05-08-2009, 10:59 PM   #2
wmdoucette
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If you're willing to drill some #30 holes in your runners, I could probably get you a servicable-enough EGT monitor. I think the one I have in quarantine is a 7 pole analog (6 Cyl + TIT). Shipping and duty might be a problem. What's the biggest airport near you? Great source of thermocouples now that new digital units have come down in price.

WD
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Old 05-08-2009, 11:16 PM   #3
williaty
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Yeah, actually, I REALLY want to put a 4 channel EGT in the car. I'd like to do testing for the RomRaider community to figure out which A/B/C/D cylinder corresponds to the physical 1/2/3/4 cylinder. It'll allow me to set the Per Cylinder Injector Pulse Width Compensation table properly, as a benefit to me.

I have NO problem drilling holes in the header. In fact, the reason I'm asking this question is to determine if brazing bungs into the headers would be effective or if it has to be welded.

Nearest gen-av airport to me is DLZ. The major commercial airport to me is CMH. I also have LCK (ex military, cargo) and OSU (private biz-jets) near me.

What sort of monitor do you have? PM me if you'd rather.



Before I start any of this, I have to figure out if I can afford it. So I need to cost out a TC amp, the TCs, the work to get them into the header, etc.
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Old 05-08-2009, 11:31 PM   #4
wmdoucette
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Wow that's exactly what I want to do, except you probably know how to accomplish it. I won't be back out to the shop until monday but I'll see what I can scrounge up for you. I know I have a harness and TCs for the analog and have 2 digital amp/displays along with alot of chromel/alumel wire. Bungs are not needed, TCs have a gasket and hose clamp setup. Sounds and looks ugly, but they hardly ever leak when installed correctly and you just need to install them at the same exhaust station and flow pattern position (in your head, because the exhaust is side by side you can picture the flows being almost symetrical).

This should be fun.
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Old 05-08-2009, 11:53 PM   #5
williaty
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Awesome, let me know.
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Old 05-11-2009, 07:04 PM   #6
RaceFaceXC
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If you do this, do a write up, id also like to do this. I throw away 4 and 6 channel engine monitors (EGT, CHT, Oil Temp, TIT, some are dual monitors for twin engine aircraft) every now and then for various reasons and the next one i find with a fixable or tolerable problem like one channel is FUBAR (on a 6channel), I'm going to bring it home with me. thermocoulples and wiring included. If I get two, you can have one. They run on 12v or 24v, auto select. JPI is the maker.
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Old 05-11-2009, 09:44 PM   #7
williaty
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Awesome! It all comes down to price, as all things do with me. Right now, the major stumbling block is the K-type thermocouples themselves. In a fitting to put them into an exhaust, I'm looking at $50+ per thermocouple. $200-$400 in the TCs alone is just too much, makes the logger cheap by comparison.
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Old 05-12-2009, 07:54 PM   #8
RaceFaceXC
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Yeah, the TC's for the aircraft stuff are $105 ea. for the customer so i hear what you're saying. But if i get one with 4 working EGT TC's, should be in business. The JPI's are all K-type, too. The JPI aircraft TC's are bayonet type on a band clamp that seal fairly good on just a 1/8" hole in the primary. They use a stainless contoured washer and a special forked support wasker that is supposed to holy the probe tightly and allow for thermal expansion, so that may be the trick to keeping a descent seal. I havent seen any exhaust soot or staining around the hole's in my few years working with them. that doesnt mean that outside air isnt being drawn into the exhaust, though, which would be no good for your WBO2/factory O2 sensor.

Almost forgot, the JPI's have a Data in/out port (that is a huge pain in the ass to install usually) and software that comes with, so im pretty sure it has a built in logger that one can retrieve data from with the software but i have never messed with it myself.

Last edited by RaceFaceXC; 05-12-2009 at 08:00 PM.
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