What does the Air Assist do?

[jpuehl]

I'm putting a '02 Camry V6 (1MV-FE) motor in my '88 Celica and I will be using a '95 Avalon ECU, harness and manual TB and was wandering what the "Air Assist" that connects to the TB does? I notice there is a tube that runs from the IAC valve on the TB to a black box with tubes running to either side of the intake. The tubes connect to ports that run long the length of the intake that open to each FI. There is a seal around each FI, probably to prevent air from being drawn in. It looks like this is some kind of system to seal around the base of each FI. I notice the intake on my '02 motor has these passages but they are not machined, but it also has a drive-by-wire TB. I'm using the '95 TB because it is manual and it was free, along with many other parts for my swap.

Thanks, Jim

[Toysrme]

An air-assisted fuel injection system employs an alternate path so that the airflow can take another route down to the intake manifold, where it re-mixes with the normal flow from an area surrounding the injector pintel. This promites higher atomization, and economy. Especially at low/part throttle.

[jpuehl]

Originally Posted by Toysrme

An air-assisted fuel injection system employs an alternate path so that the airflow can take another route down to the intake manifold, where it re-mixes with the normal flow from an area surrounding the injector pintel. This promites higher atomization, and economy. Especially at low/part throttle.

Thanks for the reply. I still don't quit understand the purpose of this system. Based on this explaination, I have the following questions:

"alternate path" alternate path to and from where? There olny seems to be an outlet at the TB. The FI tips are sealed with an O-ring, so air shouldn't be drawn through them.

"re-mixes" how is the air being mixed the first time?

"higher atomization, and economy" If this is true, why would Toyota stop using this system?

And to clarify, I do understand how the IAC works and what it does, I just don't understand how the "air-assisted FI" works. Maybe this is the correct explaination and it just needs to be "dumbed down" a few levels so I can understand it.

Thanks, Jim

[marc780]

an '02 V6 Camry motor in a 1988 Celica? And the 2007 Mad Scientist award goes to....
When you complete this project can you make a post with pictures? Im interested to know how this project turns out-

[jpuehl]

Here's a link to my project on a Celica forum I post on, it should be pretty much up to date. It has been done once before to a Celica and is a very popular swap with the MR2 guys.

http://st162.com/forums/viewtopic.php?t=245

[Toysrme]

They didn't stop all-together. It simply changed forms on how it is implemented with the newer pencil type injectors. http://www.autoshop101.com/forms/h22.pdf page 11



I don't know how to say it any differently and have you understand. A small amount of air by-passes the intake ports. Goes through a different route into the intake manifold casting. Where it runs down alongside the injectors. The air then re-joins the intake ports at the injector pintels and in the process. The turbulance enhances the atomization of the fuel.

[jpuehl]

Awesome. This is exactly what I was looking for.

Thanks, Jim