Power Jet For Turbo Carbs

[extremedesigndave]

SO I have seen many people just put them in the carbs but I ran accross someone who had a third one in the compressor housing. Would this be the best possible setup. I think it would be better in the charge pipe for easy changing but can anyone fill me in on this. Just in the Carbs or a third in the charge pipe?

 

[extremedesigndave]

Anyone?

Come on Someone can help

 

[Turbotater]

SO I have seen many people just put them in the carbs but I ran accross someone who had a third one in the compressor housing. Would this be the best possible setup. I think it would be better in the charge pipe for easy changing but can anyone fill me in on this. Just in the Carbs or a third in the charge pipe?

They're in the vacume side of the compressor housing.
If you put it in the charge pipe it'd be under pressure and won't draw fuel.

 

[Boyko]

SO I have seen many people just put them in the carbs but I ran accross someone who had a third one in the compressor housing. Would this be the best possible setup. I think it would be better in the charge pipe for easy changing but can anyone fill me in on this. Just in the Carbs or a third in the charge pipe?

If it backfires under boost it could get messy.

 

[extremedesigndave]

"They're in the vacume side of the compressor housing.
If you put it in the charge pipe it'd be under pressure and won't draw fuel."

I think you are incorrect, due to the fact you keep your fuel pressure at least 1 psi above your boost pressure it would still work, also There are many people and kits that have them directly before the carb in the charge box!
I understand that it would work on the intake side of the turbo but this is a last resort. putting atomized fuel on a compressor wheel that is turning 40k rpm is a disastor waiting to happen.

 

[triple7]

putting atomized fuel on a compressor wheel that is turning 40k rpm is a disastor waiting to happen

And why is that?? Seems to me that drawing fuel through the turbo would chill the mixture and eliminate the need for intercooling?? Or minimize it. And drawing the fuel through the turbo would atomize it far better than dumping it in an air stream...maybe not. Just a thought.

 

[extremedesigndave]

Hear Me Out

I understand that drawing through the turbine is a accepted practice but here is a senerio.1. Wide open full boost 2. Slap shut the carbs, blow off occurs and what is being blown off, fuel and air at a perfect mixture for explosion. If you are running a hood this could be a problem. I know I have had problems like this on my diesels before where as your under full throttle and injecting propane into the turbine then you let off in a hurry but the air and fuel mixture needs to go somewhere so the motor is still being fed. I know snowmobiles are not diesels but there is a reason injectors/carbs are mounted as close to the combustion chamber as possible!

 

[TWISTER]

Come on guys think what happens to a turbine wheel if it gets wet?

 

[TWISTER]

They're in the vacume side of the compressor housing.
If you put it in the charge pipe it'd be under pressure and won't draw fuel.

If that were true the ones in the carbs would never work either.
Fuel will never flow from a power jet unless it has air flowing across the end of the tube creating a venturi effect. That is why you cut off the power jet so it only feeds fuel at 3/4 to wideopen same a main jet.

 

[TWISTER]

I understand that drawing through the turbine is a accepted practice

When or where has this ever been an excepted practice?

 

[TWISTER]

"They're in the vacume side of the compressor housing.
If you put it in the charge pipe it'd be under pressure and won't draw fuel."

I think you are incorrect, due to the fact you keep your fuel pressure at least 1 psi above your boost pressure it would still work, also There are many people and kits that have them directly before the carb in the charge box!
I understand that it would work on the intake side of the turbo but this is a last resort. putting atomized fuel on a compressor wheel that is turning 40k rpm is a disastor waiting to happen.

If you have pressurized fuel to a power jet you better hook somewhere else.

 

[06MXZXRenegade800]

Come on guys think what happens to a turbine wheel if it gets wet?

Depends how well the fuel is atomized....

Using a powerjet i doubt the atomization is well enough not to cause tip erosion.

 

[TWISTER]

Depends how well the fuel is atomized....

Using a powerjet i doubt the atomization is well enough not to cause tip erosion.

good answer but there is more to it anyone else

 

[Turbotater]

"They're in the vacume side of the compressor housing.
If you put it in the charge pipe it'd be under pressure and won't draw fuel."

I think you are incorrect, due to the fact you keep your fuel pressure at least 1 psi above your boost pressure it would still work, also There are many people and kits that have them directly before the carb in the charge box!
I understand that it would work on the intake side of the turbo but this is a last resort. putting atomized fuel on a compressor wheel that is turning 40k rpm is a disastor waiting to happen.

My bad. Don't know what I was thinking.lol
I have one in my compressor housing and in each of the carbs.
I use the ones in the carbs to balance the cylinders and the one in the compressor as a main adjustment. Been there 7 years now and never a problem. Its hooked to a hobb switch and only flows fuel above 4lbs boost.
Some guys let em flow all the time. Works ok on the top end but loads em up a little on the low and mid. Mines an aerocharger so theres no blow off in the engine bay. The only time mine loads up is if you chop the throttle when on high boost 3 or 4 times quickly.

 

[TWISTER]

Tater if you take off your charge tube and look inside the compressor housing you will see a where the extra fuel comes into the system it is after the compressor. i have seen how packer installs the power jet on the turbo, it looks like it dumps into the compressor itself, but it doesn't he puts a 90 deg on the inside and it dumps into the chargetube more or less.

 

[extremedesigndave]

OK

So, The first two jets should actually be after the carbs before the case and the third can be in the box after the blow off? I would think that this would be the best possible way. Set the main two for normal tune and the third would be just for the fine adjustment?

 

[TWISTER]

No the first 2 should be between the airbox and the carbs. and the third one anywhere in the crossover tube if you are using a blow off then yes after the blow off.

 

[Spaarky]

good answer but there is more to it anyone else

It goes in the charge tube, because that is where Twister says it goes. Most people dont need to know anymore than that....

You should write a book... "Turbos For Dummies" ... I would still be readin the index

 

[extremedesigndave]

Twister

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I understand that drawing through the turbine is a accepted practice

When or where has this ever been an excepted practice?

I would say it has been accepted practice since the 50's or 60's. The book I have been living my turbo life by shows pictures of Draw Through carb turbo setups on many different styles of motor's. I know that in Steam Turbine aplications (powerhouse) you need the most pure,non moisture content steam possible due to the fact that any moisture on the Aluminum, actually magnesium(powerhouse) turbines will destroy them over time. I just want to figure out the best possible way to build a turbo setup that runs consistantly and I only have to worry about the occasional clutch and jet change!

also,
all of the responses help me out a ton on figureing out the correct way of doing this setup.

 

[TWISTER]

I realize people have built draw thru's, but can you name me a current manufacturer that uses this? Why don't they use it? what happens if you do this? what does the fact that you need super dry steam in turbine generator tell you? What happens when you run high moisture content steam through a steam generator?


PS any other chiefs out there can answer these ?