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egt monitoring

Posted By: speedy383

egt monitoring - 05/15/10 02:39 PM

Need to install egt sensors,thinking of Computech 4105.Any pros or cons? Also which pipes to install,which cylinders tend to run leaner? This is on methanol at 14.7 static Indy 3, 446 cu with Rons terminator. Also what is a safe range on alky ,I am thinking around 1100? Thanks.
Posted By: rebel

Re: egt monitoring - 05/15/10 09:57 PM

i run an ETS data logger but Comp Cams bought the company & seemed to erased it off the market. i monitor all tubes & the temps range from 1060-1100*f. cylinders 3456 used to be dramaticly lean before my intake manifold got flowed along with my heads. i'm doing a new manifold so i'll be testing it's fuel distribution with the pyro's.

Attached picture 5984234-11-08-09_21121.jpg
Posted By: mac56

Re: egt monitoring - 05/15/11 09:51 PM

Posted By: MR_P_BODY

Re: egt monitoring - 05/15/11 10:25 PM

I monitor all 8... they work great for balancing the
intake... I use a data logger called a Informer...
make sure all the probe ends are in the same spot...
I set mine exactly 1" from the flange surface
Posted By: Diablo

Re: egt monitoring - 05/15/11 11:50 PM

Last year I monitored only 2 cylinders. This year i have bought the Data Quest from logitech. I needed to know A LOT more info and this will give me what I need.

If your EGT's are all close you have a good balance, then turn to reading your plug burn. Last year my EGT's were around 1100-1150. But a pulling run is more like 15-23seconds.
Posted By: mac56

Re: egt monitoring - 05/16/11 12:58 AM

Quote:

Last year I monitored only 2 cylinders. This year i have bought the Data Quest from logitech. I needed to know A LOT more info and this will give me what I need.

If your EGT's are all close you have a good balance, then turn to reading your plug burn. Last year my EGT's were around 1100-1150. But a pulling run is more like 15-23seconds.


What system did you use last year DJ?
Posted By: camastomcat

Re: egt monitoring - 05/16/11 01:03 AM

Alot of the temp you see depends on the distance from the flange you are. I have 3 different sets of headers and I suggest the probes all be the same distance from the flange. Ideal would be 1 3/4 from the flange and alcy should be around 1150 to start and tune by the plug, as mentioned.
Posted By: Diablo

Re: egt monitoring - 05/16/11 02:04 AM

Quote:

Quote:

Last year I monitored only 2 cylinders. This year i have bought the Data Quest from logitech. I needed to know A LOT more info and this will give me what I need.

If your EGT's are all close you have a good balance, then turn to reading your plug burn. Last year my EGT's were around 1100-1150. But a pulling run is more like 15-23seconds.


What system did you use last year DJ?




We used a computech System... it only reads 2 EGT's and RPM.... it was a good starting system but we now need to know how the fuel is effecting the EGT's through the run with our high speed pills and secondaries. The Data Quest will graph everything for us and plus we can add all kinds of neat things to it... I pretty much have my next 5 years of Xmas and B-day present planned out

U looking for a EGT reader?
Posted By: Dunnuck Racing

Re: egt monitoring - 05/16/11 03:29 AM

Quote:

Alot of the temp you see depends on the distance from the flange you are. I have 3 different sets of headers and I suggest the probes all be the same distance from the flange. Ideal would be 1 3/4 from the flange and alcy should be around 1150 to start and tune by the plug, as mentioned.



I have seen more than one expert say that ideally they should be in a spacer between the head and header. The closer to the head the better.I install mine as close as possible on the dyno.
Keith
Posted By: MR_P_BODY

Re: egt monitoring - 05/16/11 03:40 AM

Quote:

Quote:

Alot of the temp you see depends on the distance from the flange you are. I have 3 different sets of headers and I suggest the probes all be the same distance from the flange. Ideal would be 1 3/4 from the flange and alcy should be around 1150 to start and tune by the plug, as mentioned.



I have seen more than one expert say that ideally they should be in a spacer between the head and header. The closer to the head the better.I install mine as close as possible on the dyno.
Keith



Thats the problem we ALL have a number we like to
put them in at... being that I worked in the exhaust
lab I tried to get everyone to put them in at a set
distance... which was 1" so we could talk apples
to apples... all the headers I built I put them in
at 1"... plus it was a easy number to remember
Posted By: Dunnuck Racing

Re: egt monitoring - 05/16/11 04:22 AM



Thats the problem we ALL have a number we like to
put them in at... being that I worked in the exhaust
lab I tried to get everyone to put them in at a set
distance... which was 1" so we could talk apples
to apples... all the headers I built I put them in
at 1"... plus it was a easy number to remember




I agree,
I am trying to look as closely as I can at the temperatures seen in the combustion chamber,so the closer the better.A better way would be to look at the actual chamber temperatures but it is an expensive thing to accomplish.
In theory,as long as you check the plugs and get a reference egt number to go with them,then you have a number to aim for after making any changes.

Keith
Posted By: LA360

Re: egt monitoring - 05/16/11 07:00 AM

Has anyone experienced rich mixtures throwing off EGT values? by that I mean raw fuel igniting in the headers and giving off ultimately false readings?
Posted By: MR_P_BODY

Re: egt monitoring - 05/16/11 02:31 PM

Quote:

Has anyone experienced rich mixtures throwing off EGT values? by that I mean raw fuel igniting in the headers and giving off ultimately false readings?



Yes I've seen that... also really late timing...
they all will mess with the EGT reading... knowing
whats going on and also looking at the plugs goes
along with the readings
Posted By: Cab_Burge

Re: egt monitoring - 05/16/11 08:57 PM

Quote:

Quote:

Has anyone experienced rich mixtures throwing off EGT values? by that I mean raw fuel igniting in the headers and giving off ultimately false readings?

Yes I've seen that... also really late timing...they all will mess with the EGT reading... knowingwhats going on and also looking at the plugs goesalong with the readings 

You can cool the EGT readings with to much fuel or to little Same thing on timing Piston aircraft motors use lean of peak with 50 to 75 F degrees of peak on turbocharged motors and 25 to 75 F degrres rich of peak on N/A motors That is at steady state RPMs adjusting the mixture controllers slowly to get the readings, some have single probe systems and some have multiple probe systems on the aircraft instrument monitoring equiptment
Posted By: neonic

Re: egt monitoring - 05/16/11 10:44 PM

So why EGT monitoring? why not a wideband sensor. We run carb alcohol talking to APD they claim EGT's on alcohol are a waste of time.
Posted By: mac56

Re: egt monitoring - 05/16/11 11:13 PM

Quote:

So why EGT monitoring? why not a wideband sensor. We run carb alcohol talking to APD they claim EGT's on alcohol are a waste of time.


What system do they recommend?
Posted By: Dunnuck Racing

Re: egt monitoring - 05/16/11 11:40 PM

Quote:

So why EGT monitoring? why not a wideband sensor. We run carb alcohol talking to APD they claim EGT's on alcohol are a waste of time.



For checking distribution problems,and remember that an oxygen sensor is usually mounted in the collector so you are getting an average reading from all the cylinders on that bank.I have seen some guys run oxygen sensors in each header tube to get accurate results
Keith
Posted By: Diablo

Re: egt monitoring - 05/17/11 12:14 AM

Quote:

Quote:

So why EGT monitoring? why not a wideband sensor. We run carb alcohol talking to APD they claim EGT's on alcohol are a waste of time.



For checking distribution problems,and remember that an oxygen sensor is usually mounted in the collector so you are getting an average reading from all the cylinders on that bank.I have seen some guys run oxygen sensors in each header tube to get accurate results
Keith



EGT's are to find perfect balance for each cylinder. I know some that will change half jet sizes for each cylinder to find a balance.
Posted By: neonic

Re: egt monitoring - 05/17/11 02:42 AM

They did not give us a recommendation on systems. Most data loggers have the ability to record LM1 readings. They said about the same as the formentioned to much of a possibility of burning fuel in the header tube. Many veribles can cause off readings.
Posted By: Biginchmopar

Re: egt monitoring - 05/17/11 02:48 AM

Speedy,

I already bought the computech EGT setup and I'm going to start with the back cylinders to get close then move to the other cylinders one at a time.

Might take more passes but I'll get it in the ballpark.

My combo is Injectorators on a tunnel ram so the manifold is not that much of a concern.

Posted By: Crizila

Re: egt monitoring - 05/17/11 11:33 PM

So what's the magic number for gas( if there is one ) that everybody shoots for - or is it more of a gettim all even thing?
Posted By: Dunnuck Racing

Re: egt monitoring - 05/18/11 02:17 AM

Quote:

So what's the magic number for gas( if there is one ) that everybody shoots for - or is it more of a gettim all even thing?



Shooting for a magic number will get you in trouble.Different brands of fuel will burn differently,and some engines make better use of the burn than others.Valve timing and compression changes will change exhaust temperatures.
Keith
Posted By: Crizila

Re: egt monitoring - 05/18/11 05:05 AM

Quote:

Quote:

So what's the magic number for gas( if there is one ) that everybody shoots for - or is it more of a gettim all even thing?



Shooting for a magic number will get you in trouble.Different brands of fuel will burn differently,and some engines make better use of the burn than others.Valve timing and compression changes will change exhaust temperatures.
Keith

I'm sure there are a lot of things that will change the EGT, but I know a few guys that use it to adjust for DA changes ( carb jetting )and also as a general tuning tool. Just assumed they had a specific # they shot for.
Posted By: MR_P_BODY

Re: egt monitoring - 05/18/11 02:23 PM

I'm sure there are a lot of things that will change the EGT, but I know a few guys that use it to adjust for DA changes ( carb jetting )and also as a general tuning tool. Just assumed they had a specific # they shot for.




I use to use them to tune, I use to shoot for right
about 1300*... now days I use them for balancing the
intake runners
Posted By: Crizila

Re: egt monitoring - 05/18/11 03:29 PM

Quote:

I'm sure there are a lot of things that will change the EGT, but I know a few guys that use it to adjust for DA changes ( carb jetting )and also as a general tuning tool. Just assumed they had a specific # they shot for.




I use to use them to tune, I use to shoot for right
about 1300*... now days I use them for balancing the
intake runners


Thanks Mike. That's the number these guys are using also.
Posted By: mac56

Re: egt monitoring - 05/18/11 05:07 PM

Quote:

Quote:

I'm sure there are a lot of things that will change the EGT, but I know a few guys that use it to adjust for DA changes ( carb jetting )and also as a general tuning tool. Just assumed they had a specific # they shot for.




I use to use them to tune, I use to shoot for right
about 1300*... now days I use them for balancing the
intake runners


Thanks Mike. That's the number these guys are using also.


Like everyone one is saying though it is different for all. 1350 took the porclein off 2 plugs on my set up. Better to start low.
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