custm2500

iTrader: (11)

I am curious. My co-worker is a mustang douch bag and just bought a 306 with a V1 pushing 15 psi of boost he says.

My question is he says it has like 24 or something small as hell injectors. All the mustang injectors are tiny(16 or 18 stock). Those of us who like to go fast(LS guys) are 40-60 lbs for a mild motor. Like my 408 has 60 lbs injectors.
Am I correct in thinking the 306 can't be making too much power due to the tiny injectors that were specked for the application.

What is the approximate max HP for a said lb per hr injector? Would that number be similar across manufacturers? I realize there is parasitic loss but I am sure there is an equation that 40 lb injectors deliver enough fuel for X power.

Thanks. Trying to educate my self.

3.8redbird

iTrader: (3)

Depends how much line pressure there is and what 24lbs is rated at. I think ford using 39lb line pressure. Bump that to 4 or 5bar of pressure and they are spraying quite a bit more.

Also he could be running at 100+ duty cycle at top power or have meth injection which helps a lot.

custm2500

iTrader: (11)

No meth. NO intercooler. Just tiny injectors. All mustangs have tiny injectors is seems. My thinking is it a byproduct of them not making much power and why they are so often slow.

3.8redbird

iTrader: (3)

In that case I either A) Dont think he is running 15lbs or B) has some really restrictive heads/intake that cause high boost numbers compared to 'good' components.

ZL1Killa

iTrader: (17)

302 versus 346/350 is quite a difference... 0.7 liters. That makes the engine airflow wise use less. I doubt that he has 24 LB injectors, but I could be wrong, I would expect somewhere in the 40# range or less with that size motor. Also as others have mentioned...boost is a relative term...PSI is essentially a restriction.

I'm sure it doesn't quite work this way but 0.7 liter smaller engine is 12.2% different, our cars (LS1s) usually have 28LB injectrors...12% less of that is ~4LBs so 24LB/hr injectors for a 302. Like i said, its likely not that simple

If you have a specific airflow (LB/min) and specific AFR, and temperature then I believe you can calculate approx horsepower made (at flywheel). It is able to be calculated, I may have left some variables out...but all an engine is anyway is a big math equation.

custm2500

iTrader: (11)

What I was looking for is an injector that flows 24 lbs per hour can make a maximum of 40 hp. Thus a 8 cyl with 0 perasidic loss would make a maximum of 320hp. Those numbers aren't correct but they should be close.

I know there is a way to tell the maximum amount of energy able to be produced by a given amount of fuel. I am sure there is a good deal of data that tells you approximatly what % power is lost in a pushrod combustion engine.

I just need someone who knows the answer.

3.8redbird

iTrader: (3)

http://www.corvetteinjectors.com/calculator.html

try here. I get 44hp per injector on 24.2lb injectors @39psi. 55hp per injector if the pressure is bumped to 60.