What should the engine load be at idle?
What should the engine load be at idle?
So, the baseline of our formula for calculated load at idle is 3.4 grams per second (current airflow) divided by 10.35 grams per second (max airflow) equals 33%. In the last column we saw that normal CL readings at idle could be between 30% and 50%.
What does calculated load mean on a car?
Let’s revisit the definition of calculated load from SAE: It reaches 1 at full open throttle for any altitude, temperature and pressure or rpm for both naturally aspirated and boosted engines. It indicates percent of peak available torque. It’s linearly correlated with engine vacuum.
What should the CL reading be at idle?
In the last column we saw that normal CL readings at idle could be between 30% and 50%. Now let’s look at the barometric pressure/altitude compensator. We know that as you get higher in altitude there’s less air pressure available, and therefore the MAP/engine vacuum ratio is affected by altitude.
How is the engine load adjusted for altitude?
We know that as you get higher in altitude there’s less air pressure available, and therefore the MAP/engine vacuum ratio is affected by altitude. To keep calculated load adjusted for altitude, we have the correction in the formula of BARO ÷ 29.9. Generally, you subtract 1 in.-Hg of pressure for every 1000 ft. of altitude.
So, the baseline of our formula for calculated load at idle is 3.4 grams per second (current airflow) divided by 10.35 grams per second (max airflow) equals 33%. In the last column we saw that normal CL readings at idle could be between 30% and 50%.
How to calculate calculated load on an engine?
Let’s revisit the definition of calculated load from SAE: 1 It reaches 1 at full open throttle for any altitude, temperature and pressure or rpm for both naturally aspirated and boosted engines. 2 It indicates percent of peak available torque. 3 It’s linearly correlated with engine vacuum. 4 It’s often used to schedule power enrichment.
In the last column we saw that normal CL readings at idle could be between 30% and 50%. Now let’s look at the barometric pressure/altitude compensator. We know that as you get higher in altitude there’s less air pressure available, and therefore the MAP/engine vacuum ratio is affected by altitude.
We know that as you get higher in altitude there’s less air pressure available, and therefore the MAP/engine vacuum ratio is affected by altitude. To keep calculated load adjusted for altitude, we have the correction in the formula of BARO ÷ 29.9. Generally, you subtract 1 in.-Hg of pressure for every 1000 ft. of altitude.
