Working Out the Idle Air Bypass Function on FI Modified SSD Manifolds
It turns out that another guy named Mark Kovak was also working on using a Jenvey Heritage or a dual throttle body to fuel inject using a single side draft manifold. He is trying to use a Midikit common plenum manifold and a 45mm Jenvey Heritage and I am using a Siamesed runner Steinmetz manifold with a dual throttle body. Basically the same thing, but different styles of manifold. We are talking with Jenvey and they suggested using the idle bleed passageways to provide idle air and they have a number of parts for that purpose. Below is my 1st message to Jenvey and some pics and screen shots of parts and stuff, plus a diagram of what it looks like if you use the idle bleeds and a bunch of hoses to do the job.
<<< Hi Mark. I've looked over the posts and links you've sent me and they have opened up some interesting possibilities that I wasn't aware of. It seemed to me that the idle bleed ports on your Jenvey Heritage and my throttle bodies weren't large enough to supply enough air for idle, but, apparently, after seeing the stuff that Jenvey suggested, they CAN serve that function. They have also suggested that possibly an idle air control valve might not be necessary and that the Microsquirt's Run circuitry "might" be able to keep the engine running. Yes, this is sometimes possible, but might be a little rough or inconsistant. Being that we both have an unusual single side draft/dual throttle body set up, it seems prudent that we try to get the idle air function working to run the engine at idle. But this leaves me with many questions about the size of fittings for our unique set ups and the fact that your manifold has a common plenum and mine does not. So, if you would, please send this message and the attached pictures to Simon and let's see what he says. Include this paragraph, too.
Hello Simon, my name is Gordon Payton, and I'm working with Mark to get our hybrid single side draft manifold/dual throttle body/single Jenvey Heritage FI systems working on our Opels. You and I were in communication about a year ago, but we lost contact with each other.
Both of us are trying to convert from 45DCOE single side draft set ups to FI using our SSD manifolds. We are both trying to get 2 throttles to run our 4 cylinder engines. Mark has a 45DCOE Jenvey Heritage attached to a common plenum manifold on a 2.2L engine and I have a 45mm throttle 118mm FAJS dual throttle body attached to a siamesed runner manifold on a 2.4L engine. So, we are kind of using the same dual throttle device, but on slightly different displacement engines, and one of us has a common plenum manifold and the other has a siamesed manifold. I have used both types of manifolds with Weber 45DCOE's and they work identically. To help balance things better on my siamesed runner set up, I have drilled a 10mm passageway through the flange to help balance the vacuum. See the 3 attached pictures showing my set up.
If you would prefer to deal with me seperately I could open a seperate Contact Form for just my particular set up. Let us know.
For now, Mark and I are both working on getting the idle function working. I see that you have suggested using the idle bleed passageways to introduce the air from an idle air control valve to the engine side of the throttles.
Can those small holes in our throttle bodies actually deliver enough air to run our engines at idle? Remember that we are only using 2 throttles to run 2.2/2.4 engines. Or would it be better to drill and tap larger holes for larger fittings into our Heritage/throttle bodies or into the mounting flanges of our manifolds?
I have more questions, but I'll stop here in case you want to deal with me separately. >>>
Thank you,
Gordon Payton
