finally got pyrometer installed
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From: Bald Knob AR
That is true only to a certain point. That point is where the amount of fuel exceeds the amount of air available to burn it. A N/A engine has a fixed amount of air it will draw into it at any given rpm. Once the amount of air needed to burn the fuel is exceeded then the result is unburned fuel (excessive black smoke). Unburned fuel does not produce heat, it actually cools the exhaust temps the same way water injection does, hence the cold exhaust temps. It is possible to reach high EGT's and still blow black smoke but only if you have enough air available to burn enough of the fuel to create the heat. That's why I said turn the fuel back to a more effiecent burn and the temps will come up.
A turboed engine is whole nother ball game. The more fuel you put to it the more boost it makes. The more boost it makes the more air into it. The more air into it the more fuel burned. The more fuel burned the more heat it makes and on and on till it melts itself.
There is no difference between gas and diesel. They both require the correct amount of air to burn properly. Without air, neither will burn at all.
A turboed engine is whole nother ball game. The more fuel you put to it the more boost it makes. The more boost it makes the more air into it. The more air into it the more fuel burned. The more fuel burned the more heat it makes and on and on till it melts itself.
There is no difference between gas and diesel. They both require the correct amount of air to burn properly. Without air, neither will burn at all.
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That is true only to a certain point. That point is where the amount of fuel exceeds the amount of air available to burn it. A N/A engine has a fixed amount of air it will draw into it at any given rpm. Once the amount of air needed to burn the fuel is exceeded then the result is unburned fuel (excessive black smoke). Unburned fuel does not produce heat, it actually cools the exhaust temps the same way water injection does, hence the cold exhaust temps. It is possible to reach high EGT's and still blow black smoke but only if you have enough air available to burn enough of the fuel to create the heat. That's why I said turn the fuel back to a more effiecent burn and the temps will come up.
A turboed engine is whole nother ball game. The more fuel you put to it the more boost it makes. The more boost it makes the more air into it. The more air into it the more fuel burned. The more fuel burned the more heat it makes and on and on till it melts itself.
There is no difference between gas and diesel. They both require the correct amount of air to burn properly. Without air, neither will burn at all.
A turboed engine is whole nother ball game. The more fuel you put to it the more boost it makes. The more boost it makes the more air into it. The more air into it the more fuel burned. The more fuel burned the more heat it makes and on and on till it melts itself.
There is no difference between gas and diesel. They both require the correct amount of air to burn properly. Without air, neither will burn at all.
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Joined: May 2008
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From: Bald Knob AR
It very well could be part of the problem. Everything about these engines affect EGT's. Operating temps, outside air temps and the amount of air going in, fuel temps and the amount, humidity, elevation. Just to name a few. The possibilities are mind boggling sometimes.
Post Fiend
Joined: Nov 2003
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From: Nutter Fort, WV
Big difference between a gas and diesel engine, namely throttle body on the gasser.
A gasser controls the amount of air with a throttle body and the amount of fuel by either injection or carbeuration.
So in a gasser, you can have lean and rich conditions.
Since an IDI diesel has no throttle body, the only thing that changes is the amount of fuel injected to control engine speed.
Rich and lean by gasoline engine standards is controlled by your right foot.
The fuel to air ratio is constantly changing as per your foot's request for more or less engine speed.
Can the engine run to lean?
No, if there is not enough fuel the engine will not run.
Can you inject to much fuel, most definitely.
Will it harm the engine, most definitely with either excessive soot or in extreme conditions fuel dilution of the oil and washed out lubrication for the rings.
Yes, you can inject enough fuel that it will cool the EGT's and lower power.
A gasser controls the amount of air with a throttle body and the amount of fuel by either injection or carbeuration.
So in a gasser, you can have lean and rich conditions.
Since an IDI diesel has no throttle body, the only thing that changes is the amount of fuel injected to control engine speed.
Rich and lean by gasoline engine standards is controlled by your right foot.
The fuel to air ratio is constantly changing as per your foot's request for more or less engine speed.
Can the engine run to lean?
No, if there is not enough fuel the engine will not run.
Can you inject to much fuel, most definitely.
Will it harm the engine, most definitely with either excessive soot or in extreme conditions fuel dilution of the oil and washed out lubrication for the rings.
Yes, you can inject enough fuel that it will cool the EGT's and lower power.
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Joined: Jun 2004
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From: florida
The extra fuel is probably cooling the egt's. Once you add your turbo, you will know for sure. You may not have to even adjust fuel to have a fine running engine. The guage is probably correct.
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it impresses me too, my dads 7.3 sure wont do it, i guess its just something to do with the mods it has and i guess the fuel system is in good shape and it has the timing is just right and fuel turned up just right, but yea my dads truck wont keep up with mine at all
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From: s.e. wisconsin
ok i found a 3 guage pillar pod with trans tem pyro and boost guages for 199 shipped to my door is that a good price? i dont really need the boost guage but i could put it in just to look cool haha
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From: Braham MN
Umm. NO. more fuel means more heat in a diesel plain and simple. NEVER EVER will adding more fuel cool the exhaust its just not possible. Black smoke is unburned fuel, we all agree on that. but black smoke will never cool your exhaust just limit the amount of power you will put to the ground only MORE air, be it boost, intercooled air, or NO3, will cool your exhaust.
No where in this thread has anyone asked what kind of pyro you have and how the probe is connected to the gauge. is it a thermocouple type that has no outside power source or do you have to supply power to it from the fuse box?? does the probe connect with a snap type coupler or does it have 4 eyelets that you put the tiny bolt through and tighten down??
Diesel Rod
No where in this thread has anyone asked what kind of pyro you have and how the probe is connected to the gauge. is it a thermocouple type that has no outside power source or do you have to supply power to it from the fuse box?? does the probe connect with a snap type coupler or does it have 4 eyelets that you put the tiny bolt through and tighten down??
Diesel Rod
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Umm. NO. more fuel means more heat in a diesel plain and simple. NEVER EVER will adding more fuel cool the exhaust its just not possible. Black smoke is unburned fuel, we all agree on that. but black smoke will never cool your exhaust just limit the amount of power you will put to the ground only MORE air, be it boost, intercooled air, or NO3, will cool your exhaust.
No where in this thread has anyone asked what kind of pyro you have and how the probe is connected to the gauge. is it a thermocouple type that has no outside power source or do you have to supply power to it from the fuse box?? does the probe connect with a snap type coupler or does it have 4 eyelets that you put the tiny bolt through and tighten down??
Diesel Rod
No where in this thread has anyone asked what kind of pyro you have and how the probe is connected to the gauge. is it a thermocouple type that has no outside power source or do you have to supply power to it from the fuse box?? does the probe connect with a snap type coupler or does it have 4 eyelets that you put the tiny bolt through and tighten down??
Diesel Rod
