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Engine temp probes
Posted by: Philippe ()
Date: January 15, 2018 06:06AM

Sorry Friends, this has probably been discussed to death, but I could not get a clear answer from previous threads.

I am rebuilding a 1965 110 engine with a fair bit of modifications. Therefore I want to do all I can to upgrade heat monitoring.
Looking at my parts, I am nor sure what to make of the CHT probes.

My heads (both left and right) seem to have a 3-8 inch threaded hole of the same depth, meaning that a thermister would not fit. . My instinct is that both heads have an ordinary CHT switch meant to feed into a warning light. I thought that regular Corvair engines only had one CHT sensor on the right cylinder.

What do you think?


My other question is about EGT . Exhaust gas probes are not expansive and not difficult to bolt on. I figure that EGT sensing would provide a reliable warning system. What do you think?

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Re: Engine temp probes
Posted by: Lane66m ()
Date: January 15, 2018 06:25AM

Regular engines 80, 95, 102, 110 only had a snap switch for overtemp. Still need that if you go for CHT temp sensors and gauges. Clark's has an adaptor for the threads to mount the 140/180 thermister in the smaller ci engines on the left head.

Al Lane
Ellabell GA

1966 Monza Coupe, 110 hp, 4 Spd
1968 Camaro SS Coupe 350 CI 295+ HP PG
1964 Greenbrier Deluxe, 6 dr, 80 hp car engine, PG
2015 Chevrolet Malibu 2LT
2015 GMC Sierra SLT Crew Cab
1947 Farmall A tractor 15 hp


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Re: Engine temp probes
Posted by: MattNall ()
Date: January 15, 2018 08:00AM

Heads are identical left or right..

Only 62-4 turbo, 65-6 140 and 180 have the deep fine threaded hole..





MODERATOR
Sea Mountain, between Charleston Harbor and Coos Bay! SW Oregon Coast
Click HERE for My Website...Click HERE for My TechPages!
..............................110-PG.................................................Webered-Turbo




Edited 1 time(s). Last edit at 01/15/2018 12:39PM by MattNall.

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Re: Engine temp probes
Posted by: 66vairman ()
Date: January 15, 2018 08:57AM

If you run thermocouple sensors and separate gauges (I assume you have the Monza instrument cluster) then you can install overheat warning lamp snap switches on both heads and wire them together so either one will work the lamp.

You'll need a wire with high temperature insulation from the snap switch. I've adapted Clark's thermistor wires to do this since they come with the connector and I add a wire from the harness and use the GM connector parts (Clark's sells those also, but they are available from other sources).



Edited 1 time(s). Last edit at 01/15/2018 08:58AM by 66vairman.

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Re: Engine temp probes
Posted by: Philippe ()
Date: January 15, 2018 11:55AM

Thanks to you all,
It looks like I will order the Clark's CHT thermister adaptor socket and run both heads probes: a warning light and a gauge.

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Re: Engine temp probes
Posted by: 66vairman ()
Date: January 15, 2018 12:17PM

Philippe Wrote:
-------------------------------------------------------
> Thanks to you all,
> It looks like I will order the Clark's CHT
> thermister adaptor socket and run both heads
> probes: a warning light and a gauge.

Ah - not sure what instrument cluster you have. Only the Corsa dash had the gauge requiring a thermister (and there is a modern replacement). Aftermarket temp gauges use a thermocouple, most have ring sizes that will fit under the snap switch you screw into the head. No need for the adapter.

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Re: Engine temp probes
Posted by: MattNall ()
Date: January 15, 2018 12:23PM

Philippe, 66V is correct...

When will you post some pics of your Lotus project...doesn't matter what condition it's in... We luv "build pics" I posted a few of one of my old projects for you

Also, you've never told us where you are!





MODERATOR
Sea Mountain, between Charleston Harbor and Coos Bay! SW Oregon Coast
Click HERE for My Website...Click HERE for My TechPages!
..............................110-PG.................................................Webered-Turbo

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Re: Engine temp probes
Posted by: MattNall ()
Date: January 15, 2018 12:33PM

Here's what you need... many have used this already..

[www.aircraftspruce.com]





MODERATOR
Sea Mountain, between Charleston Harbor and Coos Bay! SW Oregon Coast
Click HERE for My Website...Click HERE for My TechPages!
..............................110-PG.................................................Webered-Turbo

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