EGT Sensor on CR125 placement.

Cesar Rull · Posted: Thu Oct 18, 2012 10:04 pm Post subject: EGT Sensor on CR125 placement.

I found the following thread with very good information.
http://www.ekartingnews.com/viewtopic.php?t=67680&sid=40ffdd96c340754a423383e7c7686186

I wonder though it is applies to a honda engine considering the pipe is not straight and rather shaped like a horn.

Does anyone have any pictures they can share on how they installed their EGT on a CR125 application?

Does the CR125 pipes RLV R4 for instance have enough diameter for an AIM egt probe?

Thanks

Tyson Henry · Posted: Fri Oct 19, 2012 6:05 am Post subject:

Certainly you saw this thread:
http://www.ekartingnews.com/viewtopic.php?t=118060

Live without an EGT.

al nunley · Joined: 13 Nov 2006 Posts: 3066

John Mulvihill · Posted: Fri Oct 19, 2012 10:04 am Post subject:

Good info in those posts.

Braze a nut on the outside of the pipe. Brazing a nut rather than welding will put less stress into the sheet steel. The Mychron sensor will protrude about 1/2" inside, which will be fine.

I usually drill a 1/4" hole for the fitting and hold it in place with a cotter pin while brazing. Run a tap through the hole after everything cools.

The tiny nuts are a pain to braze or weld. I usually make my own mounting nuts by cutting a piece of 1/2" steel rod about 1/4" long, drilling and tapping.

Used crank plugs from a KT100 are perfect for this and Free.

The steel in the outside curve of a pipe is going to be the thinnest due to stretching. Not the best place to weld a fitting.

Tie down the sensor wire so it doesn't stress anything due to vibration.

No other words of wisdom to add.<LOL>

John
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Cesar Rull · Posted: Fri Oct 19, 2012 3:54 pm Post subject:

I would use an O2 sensor but I was told they are not legal...
Well I guess its back to water temp only for now. I mean I guess EGT would be good to keep an eye on things..

Mike Goebel · Posted: Fri Oct 19, 2012 6:26 pm Post subject:

Just put a

Main 175
Pilot 55

In it and forget it!!

Mike G.
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Cesar Rull · Posted: Fri Oct 19, 2012 9:14 pm Post subject:

Mike what you referring you. I am sorry I am not following.

al nunley · Joined: 13 Nov 2006 Posts: 3066

Jim McMahon · Posted: Sat Oct 20, 2012 8:29 am Post subject:

If you wanted you could have a second pipe for testing with a wideband sensor in it. A plain ole O2 probably isnt going to switch fast enough. Get a battery on there to power the heater and it shuold last about 5hrs before it gets ruined. You would get some very valuable data from it. Of course you would need to log air density too, throttle/slide position probably wouldn't be a bad idea either.

To start off though, air density gauge along with piston crown/header check is where you should start IMO. Use EGT to compliment it if you like.

Mike is referring to jet sizes.
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Oscar Biondi · Posted: Sat Oct 20, 2012 8:41 am Post subject:

joseph hollinger · Posted: Sat Oct 20, 2012 9:53 am Post subject:

Cesar Rull · Posted: Sat Oct 20, 2012 10:37 am Post subject:

thats not good, those boch sensors are expensive aren't they? I have never had to replace one on a car. But you guys bring up a good point.

Aim did tell me about the second pipe for tuning which some people do.
I think that a club level though it wouldn't a big deal if I have the sensor were in there, but in my case I don't have a battery.

BTW then O2 goes on the pipe? as in on the RLV R4 pipe... I better find me a used one if I am going to need two pipe for this to work.

Oscar Biondi · Posted: Sat Oct 20, 2012 11:21 am Post subject:

You can buy two-wire O2 sensors for $10 bucks on clearance all the time on Rockauto. Usually made in Japan. They don't last forever but will last for a long time as long as you don't run too rich. You also have to remove the probe shield to make them work better. I've used them with a Leopard and work great.

joseph hollinger · Posted: Sat Oct 20, 2012 11:53 am Post subject:

With leaded gas?
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Oscar Biondi · Posted: Sat Oct 20, 2012 12:05 pm Post subject:

Yes, I've only used it with leaded gas.