formula.. for injector size??

[BOWTIE6872]

is it by. airflow
hp
ft lbs
c.i.d.
H-e-L-p

[horsewidower]

is it by. airflow
hp
ft lbs
c.i.d.
H-e-L-p

None of the above. Its by how much fuel it flows.

Are you asking how to choose injectors?? Look at RCs website for some insight. http://www.rceng.com/technical.aspx

[BOWTIE6872]

thank you..
I knew there rated by fuel flow..
I am try'n to see if there is a formula. for picking the right ones ,base on hp.. /

[Matt Cramer]

It's based off of horsepower. For a naturally aspirated motor, you'll figure on 0.5 lb/hr of fuel flow per horsepower. Then divide by 0.90 to 0.85 to account for how the injectors aren't held fully open.

[BOWTIE6872]

It's based off of horsepower. For a naturally aspirated motor, you'll figure on 0.5 lb/hr of fuel flow per horsepower. Then divide by 0.90 to 0.85 to account for how the injectors aren't held fully open.

so for 500hp n/a motor you're looking at 295 lb/hr
or about 45 gallons/hr

[Matt Cramer]

Sounds right; a set of eight injectors around 36 lb/hr should be right on the money there if it is port injected.

[horsewidower]

Sorry that link doesn't work. Try this one and look under Technical notes/sizing on the left side of the page. http://www.rceng.com/

I'd probably go to 42s to give you some head room. You want 500hp now, you'll want 550 later.

[BOWTIE6872]

it's at 500 now..
procharger later