Logging airflow?

[whitebread]

Is there a way i can either log airflow in lbs/min or calculate it from the given info?

[hakcenter]

take your injector size, and pressure, get the full size, calc against pulse width, there's your rough fuel.

Multiply fuel by AFR and you now have air.

[whitebread]

Do you have a formula or a link to one? After many hours of looking, i was unable to find one. I understand the info i need, just not how to put it together.

[hakcenter]

http://www.hywell.org/plhelp/injdutycycle.html

My way is just converting cc/min to lbs/min, then multiply by pulse width, multiply by AFR.


950cc = 42.48 lbs/min
13ms
12.5:1

(42.48 * 0.013) * 12.5 = 6.9lbs/min

6.9 lbs/min ? I think I'm tired its 1am lol

[whitebread]

Bookmarked that link for sure, thank you.

Hmm, formula seems a bit off lol. No sleep ftl 

Isnt injector conversion just dividing by 10.5?

450cc/10.5= 42.86lbs/min


I'll have to fire the laptop up and fill in your formula. See what i come up with.

[hakcenter]

I think you get the idea

950 cc/min * 0.013ms = 12.35 cc's of fuel

Gasoline is 737.22 kg/cu.m / 100 = 7.3722 da g/cc

12.35 * 7.3722 = 91.04667 deka grams

91.04667 * 12.5 = 1138.083375 deka grams of air ?

25.0904435 lbs of air.

etc etc etc
http://www.simetric.co.uk/si_liquids.htm

[whitebread]

You are just full of useful info arent you haha. Thanks again. Maybe someone will find this thread usefull later on.

[hakcenter]

You are just full of useful info arent you haha. Thanks again. Maybe someone will find this thread usefull later on.

I guess. The more awake me obviously has more math abilities than the 4am me.