I need to know if the older GM injectors can handle alcohol?
There the only part of the fuel system I'll be using, I just don't want them falling apart on me or leaking when shut off.
Any one ever try using these injectors like this?

 

Most modern rubber components, i.e. gaskets, O-rings, etc., are synthetic and impervious to alcohol, oil, and many other solvents.

 

Thanks, That is good news.
Want to use them for injecting alcohol into my diesel.

 

If the question is how much with regards to flow lbs/hr

Gasoline takes 1/2 a pound of fuel to make 1 HP
Alcohol takes 1 pound of fuel to make 1 HP

That should get you in the ballpark

Denny@JDS Induction Products

 

I'll be useing ethanol, so it should be BSFC should be around .65lb/hp/hr
Yea methanol would be very close to 1.0lb/hp/hr.
Is there a way to figure out put of an injector, say going form liquid like alcohol or gasoline to gassous propane?
Say I have an injector that puts out 15lb/hr @ 3bar with gasoline, is there a way I can figure out how much gasous propane it would put out at different pressures?
I test fired injectors with nitrogen and they don't put out much.
Problem between the mass gasoline and the mass propane gas @ 4bar is a difference of some where around 91x.
I built the propane injector for my truck and it takes a .042'' hole with 60psi of propane to get about 8lb/hr of gassous propane to my engine.

 

You can't compare flowing nitrogen and propane. Nitrogen is a gas at any reasonable temperature or pressure. Propane should remain in liquid form until it actually exits the injector. There will be a loss of flow capacity, depending on the point in the injector nozzle where the phase change occurs.

 

Would comparing the Specific-Gravity of each fluid/gas help you to determine that ratio?

Could you create a formula/ratio by using the known BSFC of any fluid and a ratio number to get close. Since you already have several knowns, one you created yourself, with your truck.

Just my .02

Denny

 

Shooting LP into an engine would be cool. Maybe some day I will.
I have a very good idea in the difference of density of gasoline vs. propane gas @ 4bar.
I know what spec gravity of gasoline and know what it is for propane gas too.
I'm left with the difference of coefficient of stiffness between the 2.
Ran into this problem before when I was developing my intake harmonics + boost problem, where I wanted to know how intake harmonics changed under boost and higher temps.
It all came down the the coefficient stiffness of the air at different pressures and temps. The square root of p times r times t.
I don't know if the injectors would like opening with LP.
At room temp LPG stays liquid at about 100psi and under the hood it will get hotter and cause vapor lock.
Plus I use the vapors. I'm set up to use gas.
I think I need to get ahold of the cheapest largest injectors I can find on ebay and do some more tests form there.
My home made primary injector puts out about 70 cfm of propane, it would be nice if I could get some secondary (car fuel) injectors that put out around 2 to 5 cfm each.
It is nice having the injector and noid together as one unit.
Looks like I have some more tests to run. All the car fuel injectors I have on hand are 15lb/hr and 17lb/hr.
At least with those I can figure about how many gasoline lb/hr's = so many propane cfm.
I'll do it with tests.
Does any one here even do any thing with propane?
Because I will be coming up with some mildly interesting numbers here soon.