Compressed air velocity (why CP injection is bad news)

[The Convert]

Yeah for sure if your turbo is 2" outlet run 2" until the end tank. If it is 2.5" run 2.5" etc. Now twins should probably be roughly what Tony wants to run after the merge.

In the case of twins, After the merge I would run the same cross sectional area as before the merge, but rounded up 1/4" on the OD to account for turbulence in merging air. Those are my initial, untested thoughts anyway.

[Ingeniator]

In the case of twins, After the merge I would run the same cross sectional area as before the merge, but rounded up 1/4" on the OD to account for turbulence in merging air. Those are my initial, untested thoughts anyway.

Yeah I would agree on this. But I don't think it will be as sensitive. Ideally I would keep the flows split until the end tank.

[spxxx]

So optimum location for a nozzle (if intake mani isn't an option) - charge pipe or tapped FMIC cold side?

My methanol injection hasn't been suppressing IATs as well as I think it should be.

[CKI@Motiv]

So optimum location for a nozzle (if intake mani isn't an option) - charge pipe or tapped FMIC cold side?

My methanol injection hasn't been suppressing IATs as well as I think it should be.

I wouldn't spray at the IC outlet.

For charge pipe ideally 2 nozzles 90* apart between your BOV and TMAP is ideal. Its okay to have it before your BOV but small amounts will go out. Meth flow usually stops and has already gone past the BOV before it even opens. Some instances the meth can still flow with the BOV being open. Ive done it and never really had any problems.

[corsair]

Nice post.

[mallenwase]

thanks for everyone who replied

[kingtal0n]

Sorry but what is "CP", counter productive? cold pipe? core pastrami? It doesn't say anywhere. Was it really too much effort to type out the whole word?


Aside,
Meth/water is generally injected as close to the cylinder as possible, because you do not want it to evaporate(phase change) until the intake valve is closed. If it evaporates prior, the gases now take up space which displaces oxygen (atmospheric content). Also, meth/water is not intended for intake air temperature cooling obviously since you don't want it to change phase until the intake valve is shut. I know that sounds crazy because they market the system as exactly that; its just marketing, and technically if you consider combustion chamber cooling equivalent to IAT cooling then it really does, just not the way most people think. I'll provide refs from users around the internet if desired...

[CobraMarty]

Sorry but what is "CP", counter productive? cold pipe? core pastrami? It doesn't say anywhere. Was it really too much effort to type out the whole word?


Aside,
Meth/water is generally injected as close to the cylinder as possible, because you do not want it to evaporate(phase change) until the intake valve is closed. If it evaporates prior, the gases now take up space which displaces oxygen (atmospheric content). Also, meth/water is not intended for intake air temperature cooling obviously since you don't want it to change phase until the intake valve is shut. I know that sounds crazy because they market the system as exactly that; its just marketing, and technically if you consider combustion chamber cooling equivalent to IAT cooling then it really does, just not the way most people think. I'll provide refs from users around the internet if desired...

Charge Pipe.

And the extra power that happens from the water injection comes from the water entering the combustion chamber and flashing to steam and the rapid expansion which occurs and there is a 'steam engine effect' occurring inside the combustion chamber leading to more power... yeah right?

[CobraMarty]

Water volume in solid state expands 1700 times when it turns to steam.
1cc water becomes 1700cc steam by volume.

[kingtal0n]

Water takes heat out of combustion process, power is reduced. Most people using 50/50 meth water report loss in power, or similar power, when nothing else is changed. Additional power is possible when boost pressure is increased to take advantage of the increased resistance to detonation.

Water volume in solid state expands 1700 times when it turns to steam.
1cc water becomes 1700cc steam by volume.

Any liquid molecule, whether gasoline, water, alcohol, oil, it doesn't matter: they all follow the general rule of 22.4L gaseous molecules is the result of 1 mole of matter evolved from liquid to gas. Which is why you don't want it to evaporate before it hits the CC and the valve closes since it takes up just as much space as air. The only exception occurs when dealing in especially large molecular structures, but this is rarely a consideration in automotive applications.