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Posted by: BillJ Jan 26 2021, 08:02 AM

When I had a track car many years ago it had a dual CHT gauge that was very nice for detecting unequal heating on each bank. Definitely want to add this to my current car once the 2056 goes in. I cannot for the life of me find one that is both Fahrenheit and a good match for the other indicators in cabin. Anyone have one they use and recommend?

Posted by: VaccaRabite Jan 26 2021, 08:54 AM

I have a NOS aircraft CHT that was made for aircraft aircooled engines that will display all 4 cylinders. There was a group buy for them years ago and I never ended up installing it.

My personal feeling is that so long as you are tracking Cyl 3, you are fine. If any of your heads are hotter then #3, you have a serious problem.

Zach

Posted by: jim_hoyland Jan 26 2021, 09:29 AM

See : https://www.aircraftspruce.com/categories/avionics_instruments/av/menus/in/chtgauges_aerologic.html

Posted by: BillJ Jan 26 2021, 12:02 PM

I like the idea of tracking all the cylinders. Is that analog or digital? I would prefer analog just so to keep it period looking. Where does it take the reading and how does the probe route?

Posted by: FlacaProductions Jan 26 2021, 01:59 PM

More specifically - go here and you'll find analog versions:
https://www.aircraftspruce.com/categories/avionics_instruments/av/menus/in/chtgauges.html

Posted by: BillJ Jan 26 2021, 03:04 PM

Thanks for the links. On the engine side of things how do you all install the sensors? Are they different than what is listed for this aircraft application?

Posted by: VaccaRabite Jan 27 2021, 06:59 PM

Thats easy. The sensors all have big ring terminals on them that go under the spark plugs.

You remove the washer from the plug, put the sender ring on there, and thread the plugs back in. You may need to grind the heads a little to carve a channel for the wire under the plug to come out of the heads. Pretty easy.

Zach

Posted by: FlacaProductions Jan 27 2021, 07:10 PM

I think you want a 14mm terminal to fit under the plug(s)

Posted by: BillJ Jan 27 2021, 07:11 PM

Awesome. Despite some of the gauge descriptions talking about 2 stroke engines that is immaterial I take it? Temp is temp, right?

Posted by: DRPHIL914 Jan 28 2021, 12:27 AM

nice but at either $600 or $900 i can think of a lot better ways to spend that $$ on my 914, wow those are a lot of dough!

Posted by: Mark Henry Jan 28 2021, 06:59 AM

Well not that easy, you often have to R&R the engine to clear the head for the thermocouple and trying to install it without this clearance could ruin the thermocouple.

Posted by: BillJ Jan 28 2021, 07:28 AM

Well now would be the right time then seeing as the engine is out. I agree the digital guages are too pricey but the analogs are right around $100 so really not bad. Would need to extend the leads of course quite a bit but that isn't hard.

Posted by: Mark Henry Jan 28 2021, 07:40 AM

Not that easy again, you can't just cut and splice in wire, I forget the technicial reason but it has to do with calibration. You have to buy their wire extention kit for that gauge.
Do a search this has been covered before, the above came straight from the manufacturer IIRC.

Posted by: BillJ Jan 28 2021, 09:52 AM

Thanks for keeping me honest Mark! I did mean the extension kit they offer.

Posted by: horizontally-opposed Jan 28 2021, 10:07 AM

That moment when you realize you love that digital gauge that allows easy reading of all six heads…

…but don't want a digital gauge in your vintage car.



Some of the analog options are plainly gorgeous design, particularly those that look like they're out of old British aircraft.

Interesting idea, watching both banks. I had a CHT gauge set up for my 914 years ago, but got the sense it isn't as important in a six as it was with my old Type IV.

Posted by: Mark Henry Jan 28 2021, 10:16 AM

I honestly don't agree with one for each head CHT or O2 WB, it's TMI when your head is suppose to be up and in the game.
Just use one CHT on #3 for T4.

Posted by: Root_Werks Jan 28 2021, 10:43 AM

https://iflyei.com/product/ubg-16-ultimate-bar-graph/

Agree with what others have said, as long as you keep tabs on cyl-3, should be okay.

Posted by: BillJ Jan 28 2021, 12:30 PM

When i was running the 6 cylinder was helpful to make sure the temps were consistent on each bank with the carbs. In this instance with a -4 and running stock FI maybe a single is alright.