Exhaust Gas Temp Guage
 

How many of you guys run one and what is the max temperature you feel safe with? I run a duel digital unit and back off when it hits 1400 degrees. What cylinders do you have your probes in? Mine are in #6.

No one runs a EGT???

how do you rig up the sensors if you have CMI? Doy ou have to put a hole in them and weld the sensor in place?

What I did was look at a head cut away that Jim V. has and found that if you keep it within 1/16 to 3/32 away from the exhaust head to header flange you can drill the head without getting into the water jacket. So that is where my thermocouples are mounted in #6 cylinder exhaust port.

hmm how big are the sensors? I'm not to sure hwo i feel abotu drilling into the heads. I was thinkgin of mayeb gettgn some kind of spacer that would go between the head and the header. That. coudl be drill though easily. and mount eth sensor. I figure even if it was 1/2" thick the headers woudl still fit properly. I konw eddie marienb sells similar spacer so you can use 454 chevy headers on 460 ford engine. I figure soemthign similar but just a straight spacer with bung in it.

How accurate are those things? I think monitoring the exhaust temp would be pretty valuable assuming teh sensor was accurate.

I have one on my motor on cylinder # 1. In my opinion it is about the most important guage I have. I am constantly staring at it. Under 7 psi boost I see around 1100-1200 degrees.

But what is the maximum temp you feel comfortable with?

Whipple system has one!
 

I've got one on my 454 mag EFI compliments of Dustin. This was one of the significant technical reasons i went with his system vs others. It's tied into an idiot light and the computer etc. I suspect most of the efi systems use it.

It mounts in the merc manifold at #1, I can't remember if 1350 or 1400 triggers it. Happy to have it, any blower or performance motor should have one. I've got one on my cummins too. Both use 1/4" pipe thread if i remember right.

This is a good topic that got a lot of good response a while back .
I have them on my engines on #1 & #8 cylinders on both motors .They are in a 1" spacer between the head and exhaust manifold . MOst boats would not have the room for these spacers. Mine does .
I was told that the sensor being this close to the cylinder gives false high readings as it is being burnt by flaming exhaust gasses comeing out of the head . I am told that the ideal place for the sensor would be about 3-4" into the exhaust tube of the header . That would be hard to do with water jacketed headers . So we do the best we can . I don't have a lot of experience with mine yet but it runs 900-1200 most of the time . It gets up around 1400- 1500 running harder . I think it is too hot at that but they say it is because of where it is mounted . They say if it was where it should be ,the temps would be a few hundred less .

o2 sensors in marine manifolds.
 

Wheve can supply stainless one piece hi performance manifolds in all configurations Ford Chev etc with o2 sensors in the correct position to give correct readings.

o2 sensors in marine manifolds.
 

sorry forgot to include picture Ford 351 windsor pictured other applications including buick v6 gm 5.7 LS1 6.0 LS2

The Bros here have a 50 hustler with trip 900hp's and they run those.

The number you mentioned is what they go by. They shut off if it hits 1400. usually around 1100 I think.

Hope this helps.

On the truck if I see 1400 I back off but I never shut it down, I want the exhaust to keep flowing as it can cool, a boat is a different story though. I let it idle until it hits 400 or so. I see 1100 most of the time, only higher if I am towing a big load at speed up a good grade.

What type of gas enging needs a EGT guage. I don't have any experience with high hp gas engines. I have a little experience with diesels. I installed a egt and boost guage on a diesel in a truck. The temp guage was installed pre turbo.
We ran the engine without any mods to establish baseline data, installed an aftermarket chip, and gathered more data. Installed a propane injection system, and then you really had to watch it.

EGT's without mods 900 deg F
EGT's with chip 12-1300 on top end
EGT's with chip and propane, had to back off at 100mph, egt's touched 1500 for a sec,

Am told not to exceed 1325 deg F pre turbo.

I run and have run pyro's for sometime...first with my IMCO manifolds & now with my CMI's. BTW, you can send your CMI headers back to CMI and they will install the sensor coupling. I always encourage my customers to order their CMI headers with the sensor coupling, even if they do not plan on using it right away.

BTW, I usually mount the probe on the #1 and/or #8 cylinders and keep the temps at 1250 or below.

I had gaffrig egts in my lightning headers in #7 & 8,they read 1500 to pegged all the time when under throttle,plugs were black and sooty. I quit paying attention to them because they obviously were way off. I tested them once with a comtrolled heat source and compared them to my pyro 2000 gauges on my snowmobile-they read 200-300 degrees too hot so don't waste your time on the gaffrigs. I currently have a 02 bung in my stainless marine 3's in #8,about 1 inch from exhaust flange on bottom,on crocketts innovate it seemed very accurate,Smitty

Ever done any hp testing compared to cmi's or stainless marine 3's? Smitty