Perrin PWI Best place to put nozzles???

[Johnboy1065]

Okay I have the perrin pump with a flowjet primer pump and have 2 nozzles that will be injecting methanol. I know that one goes near the throttle body (around 5 inches away) But where does the other go??? I by a few people right near the throttle body also but then I was told right after the intercooler.


Just wanting to know the BEST places to put both these .7mm nozzles.

[Richard L]

I suggest putting the other one near the exit of the IC.

Water normally exists in the form of liquid (as in puddle) or in vapour (humid air). Anything between the two states is termed as suspended droplet. The size of the droplet is proportional to the surrounding temperature and pressure. You will notice this when driving in the early hour of the morning through and series of foggy areas. Area where the sun heat has shone through is normally clear of fog. It doesn't mean the the droplets has turn into single molecules, it just become smaller and one can see through it (no fog).

If you apply the same physical property of water vapour in water injection application, it should behave the same way. Water is converted into small droplets via an atomising nozzle for the sole purpose of increasing the surface area. If water is used for effective induction cooling, the nozzle should logically be placed as far away from the throttle as possible, allowing ample time for the hot air exiting the IC to mix with the water droplet. During its journey, as the heat is being absorbed, the droplet size is reduced. Please note that there is never enough heat energy to reduce the water droplet size to a single molecule. At best the drop might reduce from 80 um to 60 micron. Each micron-droplet still contains thousands of molecule of water, the occupation of air volume is minimal.

A relatively minor reduction in droplet size will absorb a great deal of heat in the inlet track. The amount of vaporisation will depend on the temperature, pressure and wetness of the incoming air. When the 100% relative humidity is reached, no more vaopour is formed. The droplet continues its journey pass the throttle and into each inlet runner. If the droplet is small, there is a good chance of better droplet distribution amongst the cylinders. Most engines are tuned to the knock threshold, if the droplet is not evenly distributed, one will tune the engine based on the cylinder receiving the least amount of cooling. The other cylinders are over cooled and loose combustion temperature and pressure - simply put, power is lost unnecessarily.

Methanol behaves much the same as water.

[Johnboy1065]

Originally Posted by Richard L

I suggest putting the other one near the exit of the IC.

Water normally exists in the form of liquid (as in puddle) or in vapour (humid air). Anything between the two states is termed as suspended droplet. The size of the droplet is proportional to the surrounding temperature and pressure. You will notice this when driving in the early hour of the morning through and series of foggy areas. Area where the sun heat has shone through is normally clear of fog. It doesn't mean the the droplets has turn into single molecules, it just become smaller and one can see through it (no fog).

If you apply the same physical property of water vapour in water injection application, it should behave the same way. Water is converted into small droplets via an atomising nozzle for the sole purpose of increasing the surface area. If water is used for effective induction cooling, the nozzle should logically be placed as far away from the throttle as possible, allowing ample time for the hot air exiting the IC to mix with the water droplet. During its journey, as the heat is being absorbed, the droplet size is reduced. Please note that there is never enough heat energy to reduce the water droplet size to a single molecule. At best the drop might reduce from 80 um to 60 micron. Each micron-droplet still contains thousands of molecule of water, the occupation of air volume is minimal.

A relatively minor reduction in droplet size will absorb a great deal of heat in the inlet track. The amount of vaporisation will depend on the temperature, pressure and wetness of the incoming air. When the 100% relative humidity is reached, no more vaopour is formed. The droplet continues its journey pass the throttle and into each inlet runner. If the droplet is small, there is a good chance of better droplet distribution amongst the cylinders. Most engines are tuned to the knock threshold, if the droplet is not evenly distributed, one will tune the engine based on the cylinder receiving the least amount of cooling. The other cylinders are over cooled and loose combustion temperature and pressure - simply put, power is lost unnecessarily.

Methanol behaves much the same as water.

Okay Thanks,

Thats very scientific lol and makes a lot of sense

[Johnboy1065]

Originally Posted by Richard L

I suggest putting the other one near the exit of the IC.

Water normally exists in the form of liquid (as in puddle) or in vapour (humid air). Anything between the two states is termed as suspended droplet. The size of the droplet is proportional to the surrounding temperature and pressure. You will notice this when driving in the early hour of the morning through and series of foggy areas. Area where the sun heat has shone through is normally clear of fog. It doesn't mean the the droplets has turn into single molecules, it just become smaller and one can see through it (no fog).

If you apply the same physical property of water vapour in water injection application, it should behave the same way. Water is converted into small droplets via an atomising nozzle for the sole purpose of increasing the surface area. If water is used for effective induction cooling, the nozzle should logically be placed as far away from the throttle as possible, allowing ample time for the hot air exiting the IC to mix with the water droplet. During its journey, as the heat is being absorbed, the droplet size is reduced. Please note that there is never enough heat energy to reduce the water droplet size to a single molecule. At best the drop might reduce from 80 um to 60 micron. Each micron-droplet still contains thousands of molecule of water, the occupation of air volume is minimal.

A relatively minor reduction in droplet size will absorb a great deal of heat in the inlet track. The amount of vaporisation will depend on the temperature, pressure and wetness of the incoming air. When the 100% relative humidity is reached, no more vaopour is formed. The droplet continues its journey pass the throttle and into each inlet runner. If the droplet is small, there is a good chance of better droplet distribution amongst the cylinders. Most engines are tuned to the knock threshold, if the droplet is not evenly distributed, one will tune the engine based on the cylinder receiving the least amount of cooling. The other cylinders are over cooled and loose combustion temperature and pressure - simply put, power is lost unnecessarily.

Methanol behaves much the same as water.

Okay Thanks,

Thats very scientific lol and makes a lot of sense. Thats what I'll do then is put it near the exit of the Intercooler.

thanks