Quote:
Originally Posted by teoman
Do you know the input parameters? I.e lengths and rpm ranges etc?
I am pretty handy sometimes 
Could you snap a photo of your intake?
Is it just the intake length after the air filter? |
My variable intake doesn't use another set of runners, rather it has a chamber connecting either sides of the runners with a flap in the middle that opens at 4000, or 4900 RPM(don't know for sure which one. On the J25 it opens AFTER VTEC. I think on my J30 it opens before VTEC.). I don't know if it has any variable rpm/throttle position logic. Either way, the first transition is quieter than the second, if that helps you figure it out.
Here is a drawing. You can see the firing order listed, so when cylinder 1 is charged, it sucks all the air coming in down into cylinder 1. Cylinder 1 fires and the next cylinder is cylinder 4. With the flap closed, the air has to reverse and go all the way back around the loop and into cylinder 4. With the flap open, the air has to reverse and can go through the center of the intake manifold, shortening the path.
The older V6 accords did not have the variable intake manifold(the J30 didn't at least, don't know about C27), and here is what their intake manifolds look like.
My generation looks like this.
This is what my manifold looks like on the inside.
Quote:
Originally Posted by ksa8907
I don't know for sure, but I am going to go out on a limb and say that with variable valve lift and cam phasing, variable intake length may not make a big difference anymore and not be cost effective.
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Probably true, most likely won't make a big difference, but it should still make a difference. It would be nice if they would develop these parts and make it an option to have them, or you can get the el-cheapo engine. I know which one i'm picking.