****...i better bring extra looseleaf

Hey Art you're going to be at the Huntington Beach seminar this weekend? Gonna be a few HT celebs there Am I invited to the after party guys?

 

Great info, even after an all nighter I understood it for the most part. Gonna read it again later on today

See you guys at the CT seminar

 

back from the dead, but i wondered what is meant when he refers to 100% VE?

throttle percentage? load?

 

VE is an acronym for volumetric efficiency. It's measured as a percentage of the total volume of a cylinder bore. It's easier to understand in this example:

If you have an engine with a displacement of 1.8L, and for a single revolution, it's able to fill the entire 1.8L with air, then it has 100% VE.

You would normally consider just a single cylinder, but since the engine is a combination of multiple single cylinders, you kind of have to make assumptions that the cylinders are homogeneous....even if they are not precisely so.

VE changes throughout the rpm band and load.

The caveat is that engines are almost never 100% volumetrically efficient, unless they're supercharged (a generic term for forced induction) or have strong manifold resonance at a narrow range of rpm.

Supercharging (and IN/EX manifold resoance effects to a certain degree) can increase VE beyond 100%.

What is load you ask?
Load and throttle percentage are proportionally related. More throttle = more load on the motor. More load = more air that is available to the cylinders for ingestion. Load is also synonymous with manifold pressure. More manifold pressure = more air that is available to the cylinders. It all fits together nicely.

 

crazy how this sick thread just ended. more good info?

 

If anyone can give some input to my injectors not getting any pulses I would be greatly appreciative

Pictures + oscilloscope screenshots found in this thread

https://honda-tech.com/zerothre...15074

 

good write up