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Old 05-06-2013, 06:35 PM
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meth/water injection in exhaust manifold

I am sure I will get ripped for asking such a stupid question but here it goes.

I have been reading up a lot on the methanol/water injection to lower egts (and some use it for hp gains).

What would happen if you injected the water directly into the exhaust system like putting one nozzle in each exhaust manifold. That would certainly lower egts... right???


Problems i can see...

Can the water cause lots of parts rust??? (or will the steam keep it clean)

Could the cool water cause the exhaust pipes/manifold/up pipe to crack? (only if it cools it off too much too fast)
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Old 05-06-2013, 06:52 PM
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Sorry but that's not going to accomplish what you want. You inject into the intake because it lowers the combustion temps therefore the EGTs.
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Old 05-06-2013, 06:54 PM
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but if you sprayed right into the exhaust wouldn't it lower egts???
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Old 05-06-2013, 07:05 PM
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Fwiw I would think that it could cause your exhaust manifolds to crack. These manifolds are( I believe) cast iron and if you inject water meth into them then that could cause rapid cooling of the manifolds which would crack them. This is all theory but I've seen cast iron crack from rapid cooling. I also just don't see a point in doing this, might aswell put it at the intake and use it fir what it was designed for.

Last edited by JGman141; 05-06-2013 at 07:13 PM.
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Old 05-06-2013, 07:22 PM
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Quote:
Originally Posted by peixinho View Post
but if you sprayed right into the exhaust wouldn't it lower egts???
If your temp probe was indeed after the air mist, it would lower the egt reading on your gauge.... but it'll give you false information. Besides, it would be very difficult to find a nozzle that withstood these extreme tempuratures AND stay clean. When you read your exhaust gas tempurature, it is to monitor how hot the air is coming out of your engine. If the air is too hot for too long, you melt your engines insides! Your exhaust pipes will live at 1500 degrees.... your pistons will not. Simply put, EGT is a tool used to monitor internal temps.
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Old 05-06-2013, 07:31 PM
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Quote:
Originally Posted by gotta_gofast View Post
If your temp probe was indeed after the air mist, it would lower the egt reading on your gauge.... but it'll give you false information. Besides, it would be very difficult to find a nozzle that withstood these extreme tempuratures AND stay clean. When you read your exhaust gas tempurature, it is to monitor how hot the air is coming out of your engine. If the air is too hot for too long, you melt your engines insides! Your exhaust pipes will live at 1500 degrees.... your pistons will not. Simply put, EGT is a tool used to monitor internal temps.
thanks that clears it up...


for some reason i thought the temps worked its way back from the turbo from the hot egt being compressed by the turbo... i thought maybe it would reduce the pressure/temp on the cylinder
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Old 05-07-2013, 02:06 AM
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What is going to happen if you inject Meth into a 1200* exhaust manifold is you are going to get compustion in the exhaust manifold, not a good thing, or if the concentration of meth is to low to combust it is going to turn to super heated steam, also not a good thing.

This is an idea who's time has come. Time to drop it that is. This is a bad idea that makes no sense.
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Old 05-07-2013, 04:37 AM
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Maybe this will help the op to understand.
You want heat in your exhaust, that is what drives the turbine.
It is important for the heat to be retained and pressure retained until it reaches the turbine housing. In an ideal situation all the thermal expansion and pressure drop would occur across the turbine maximizing the effectiveness of the turbo. This is not practical, but in engines like the 6.7 powerstroke have the exhaust in the center of the engine certainly shortens the distance to the turbo.
Monitoring EGT's is done because it is the best solution to monitor cylinder temperature with a gauge. That is the area we want to keep cool. Diesel engines have aluminum pistons. The pistons are being quenched with engine oil to cool them.
Water and Methanol are both retardants in respect to combustion. They also are non-compressible which raises compression. They water/meth allows fuel to be injected earlier without burning before the piston has reached the top of its travel. In performance engines with very low compression, the water takes up space in the piston bowl and increases cylinder pressure creating some hp gains.
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Old 05-08-2013, 02:10 AM
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Yeah aside from the cracking I would think the quenching/cooling of the exhaust gas would actually hurt spool up due to the shrinking of the molecules


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Old 05-22-2013, 08:30 AM
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Quote:
Originally Posted by the chad View Post
Yeah aside from the cracking I would think the quenching/cooling of the exhaust gas would actually hurt spool up due to the shrinking of the molecules


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Or would the expansion of the water when it turns to steam increase pressure? I would think the volume of steam would more than offset the cooling effect,but then I'm just yanking that out of my ***, lol.
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