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Home > MS Trials & Testing > EGT & CHT Logs

Paul S

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Formerly Axel

Podland

Took the first logs of Exhaust Gas Temperatures and Cylinder Head Temperatures this morning.

This follows on from the Siamesed Code Trial thread.

11000 lines of data!

I've cut out everything below full throttle to get some meaningfull data points.

The first attachement shows the variations with load. The second is analysis of the data with some trendlines.

Not sure yet what to make of it.


Attachments:

Edited by Paul S on 22nd Jun, 2008.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."


robert

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uranus

EGT same due to one probe recording 2 cyls worth of gas and other probe on one cyl ?
(whereas one would expect them to be higher on the lean outers .)

head temp, higher on outers as expected .

outers running leaner ,(as well as being due to all the other stuff talked about) ,poss aided by long primary runners creating more scavenge so more air flow and hence leaner ?.

Medusa + injection = too much torque for the dyno ..https://youtu.be/qg5o0_tJxYM


Joe C

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Carlos Fandango

Burnham-on-Crouch, Essex

how are you measuring the CHT?

have you measured all four or just one inner one outer?

what im getting at is if you have just measured 3&4 4 might be hotter than 3, 3 but 3 might be hotter than 2 and 2 hotter than 1.

although I'm sure you've thought of that.

On 28th Aug, 2011 Kean said:
At the risk of being sigged...

Joe, do you have a photo of your tool?



http://www.turbominis.co.uk/forums/index.p...9064&lastpost=1

https://joe1977.imgbb.com/



Paul S

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8604 Posts
Member #: 573
Formerly Axel

Podland


On 22nd Jun, 2008 robert said:
EGT same due to one probe recording 2 cyls worth of gas and other probe on one cyl ?
(whereas one would expect them to be higher on the lean outers .)

head temp, higher on outers as expected .

outers running leaner ,(as well as being due to all the other stuff talked about) ,poss aided by long primary runners creating more scavenge so more air flow and hence leaner ?.


I dont really think that we can draw too many conclusions from this data. The AFRs need to overlap at least to make comparisons.

Although the centre exhaust port carries twice the heat, the gas temperature should be much the same, but the outer sensor has more time to cool between gas pulses.

I certainly did not expect the EGTs to be much the same whatever load though. Interesting that they blip through a gearchange, indicating that they are quick to react.

The CHTs move very slowly. I might swap the sensors over to double check the readings, but they were the same at start/warm up.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."


Paul S

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Member #: 573
Formerly Axel

Podland

On 22nd Jun, 2008 mini13 said:
how are you measuring the CHT?

have you measured all four or just one inner one outer?

what im getting at is if you have just measured 3&4 4 might be hotter than 3, 3 but 3 might be hotter than 2 and 2 hotter than 1.

although I'm sure you've thought of that.



I have a thermocouple in No. 1 and the centre exhaust ports.

I also have washer type thermocouples under the spark plugs of cylinders 1 & 2.

I could measure 2 & 3 plugs to see if they run the same or not.

EGT Thermocouple:


CHT Thermocouples:


In the car:

Edited by Paul S on 22nd Jun, 2008.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."


Joe C

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Carlos Fandango

Burnham-on-Crouch, Essex

I think a log on 2&3 or 1&4 is wel worth a go, I think 1&4 are most likly to be different.

On 28th Aug, 2011 Kean said:
At the risk of being sigged...

Joe, do you have a photo of your tool?



http://www.turbominis.co.uk/forums/index.p...9064&lastpost=1

https://joe1977.imgbb.com/



Paul S

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Formerly Axel

Podland

Bugger, the cables wont stretch to No. 4.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."


Joe C

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Member #: 565
Carlos Fandango

Burnham-on-Crouch, Essex

sods law!

On 28th Aug, 2011 Kean said:
At the risk of being sigged...

Joe, do you have a photo of your tool?



http://www.turbominis.co.uk/forums/index.p...9064&lastpost=1

https://joe1977.imgbb.com/



Paul S

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8604 Posts
Member #: 573
Formerly Axel

Podland

Acsherly, they will just.

The problem is that you cannot extend thermocouple cables without special kit.

The cables are a metre long and just reach the TC4 on the dash.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."


Joe C

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Member #: 565
Carlos Fandango

Burnham-on-Crouch, Essex

well, make sure the engine wont move and fuck them.

On 28th Aug, 2011 Kean said:
At the risk of being sigged...

Joe, do you have a photo of your tool?



http://www.turbominis.co.uk/forums/index.p...9064&lastpost=1

https://joe1977.imgbb.com/



Paul S

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8604 Posts
Member #: 573
Formerly Axel

Podland

No. 3 CHT does run slightly higher than No. 2 under load.

Log attached.


Attachments:

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."


matty

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Turbo Love Palace Fool

Aylesbury

Is it worth checking the CHT's on the head of a carbed engine to get some idea of what temperature difference you can get away with?

At least then it would give you an idea if you've made an improvement over the carb setup? *oh well*

https://www.facebook.com/pages/Fusion-Fabri..._homepage_panel

www.fusionfabs.co.uk



1/4mile in 13.2sec @ 111 terminal on 15psi


Paul S

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8604 Posts
Member #: 573
Formerly Axel

Podland


On 22nd Jun, 2008 matty said:
Is it worth checking the CHT's on the head of a carbed engine to get some idea of what temperature difference you can get away with?

At least then it would give you an idea if you've made an improvement over the carb setup? *oh well*


I can see your point, but that assumes that the carb gives equal AFRs, but we now know it does not.

My current EFi setup needs a cam sensor and an ECU mod before we can make further improvements to the fuel distribution.

With closer AFRs, the temperatures will have more meaning.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."


robert

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uranus

yep that trace to 5600 rpm shows what looks like a diverging pattern , supports the inertia loading of fuel inot 3/2 and the problem changing direction for 1/4 as gas speed goes up ?ooooorrrr
the injection point is needing adjusting more to keep up with the air speed ? waffle waffle

Edited by robert on 22nd Jun, 2008.

Medusa + injection = too much torque for the dyno ..https://youtu.be/qg5o0_tJxYM

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