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I have made arrangements to purchase a nice plenum, plenum lid, base adapter (manifold), as well as some air meter parts and some other odds and ends.
I still want to "hide" the actual injectors inside the plenum, and have original injectors in the normal position that do nothing.
I have sketched out a "Plenum Injector Module". This will be made out of aluminum, with a removable top, and will be air tight when assembled. It will fit inside the plenum, and be attached (most likely to the plenum lid bolt holes).
The fuel supply and the wiring for the injectors will come up through the bottom of the plenum, or some other existing opening in the plenum.
This Plenum Injector Module will be as narrow as possible as still fit injectors in it. The injectors will be tilted at an angle, and pointed into the appropriate runner.
One question to be addressed is how small (physically) of an injector can be used and still supply the appropriate amount of fuel to the engine.
Anyway, here is my sketch of the Plenum Injector Module.
I have made arrangements to purchase a nice plenum, plenum lid, base adapter (manifold), as well as some air meter parts and some other odds and ends.
I still want to "hide" the actual injectors inside the plenum, and have original injectors in the normal position that do nothing.
I have sketched out a "Plenum Injector Module". This will be made out of aluminum, with a removable top, and will be air tight when assembled. It will fit inside the plenum, and be attached (most likely to the plenum lid bolt holes).
The fuel supply and the wiring for the injectors will come up through the bottom of the plenum, or some other existing opening in the plenum.
This Plenum Injector Module will be as narrow as possible as still fit injectors in it. The injectors will be tilted at an angle, and pointed into the appropriate runner.
One question to be addressed is how small (physically) of an injector can be used and still supply the appropriate amount of fuel to the engine.
Anyway, here is my sketch of the Plenum Injector Module.
You should be asking yourself the most important question; how are you going to match airflow ratio to the injectors' fuel ratio throughout the throttle opening range?
You should be asking yourself the most important question; how are you going to match airflow ratio to the injectors' fuel ratio throughout the throttle opening range?
I'm going to let the computer do that. What else is it good for?
I think you might be in for a surprise but that's just me. Keep us posted.
I suspect that there will be LOTS of surprises along the way, but that is what us rocket scientists do. We find "surprises", and then we develop solutions so they are no longer surprises.
We call the "surprises" off-nominal; the solutions bring us back to nominal.
I suspect that there will be LOTS of surprises along the way, but that is what us rocket scientists do. We find "surprises", and then we develop solutions so they are no longer surprises.
We call the "surprises" off-nominal; the solutions bring us back to nominal.
'Off-nominal', I love it! I'm not going to say anything is "busted" anymore.
ain't gonna work, for a myriad of reason that have been discussed previously
BUT, nothing ventured, nothing gained....
Bill
Bill;
I have a lot of respect for your opinions; you have definitely "been there, done that".
So, can you be more specific on why this is not going to work? There have been a lot of previous discussions, I need some help separating the facts from the opinions.
Why not just buy a correct 7375 or 7380 unit and bolt it on the car and go ?
By the time I am all in on a restored Rochester FI unit, including distributor, but not the air cleaner setup, I am looking at about $12,000 to $14,000. And the issues that come with Rochester FI systems (tuning, percolation, etc.) are still there. This is not a big deal, but it does factor in.
I thought about it, and I still think about it.
I have made arrangements to purchase a nice used (but still needing cleanup, etc.) plenum, plenum lid, base adapter (manifold), nozzle blocks, piezometer ring, spider, venturi diffuser, a couple of tubes, and a bag of small parts. I "believe" these parts are for a 1963 system. There are no fuel meter parts, and no distributor.
The only parts needed for the EFI conversion are the plenum, plenum lid, and base adapter (manifold).
I continue to search for fuel meter parts, and a distributor (at a decent price).
I am not in a hurry, and I still want to explore the EFI conversion path.
Maybe, but I am hoping my CFD guys at work can help me model it.
I'm not seeing what value that internal box adds other than mechanical support for the injectors. Seems you could come up with skeletonized mechanical support and get much better air flow.
By the time I am all in on a restored Rochester FI unit, including distributor, but not the air cleaner setup, I am looking at about $12,000 to $14,000. And the issues that come with Rochester FI systems (tuning, percolation, etc.) are still there. This is not a big deal, but it does factor in.
I thought about it, and I still think about it..
Ed,
I think your cost estimate is too high by, oh, 50% or so. With patience, you can find a rebuildable FI unit and have it rebuilt (or better, do it yourself) for significantly less.
Tuning isn't tough. As far as I"m concerned, this is a non-issue.
Fuel perc, well, yes, in Huntsville you might experience this if you try to drive in stop/go traffic. As long as you are moving, fuel perc does not happen.
I have a lot of respect for your opinions; you have definitely "been there, done that".
So, can you be more specific on why this is not going to work? There have been a lot of previous discussions, I need some help separating the facts from the opinions.
Many thanks in advance for your assistance.
Ed
Ed
as Jim and I have said on several occasions, you simply cannot crowd all that stuff inside the doghouse and have sufficient air flow; kinda sorta like running with the choke closed to some degree. it would 'run', but it will run like crap... the guy (my apology for the senior moment and not remembering his name...) from Michigan did a masterful job of hiding the EFI stuff.
someone else (again, an apology...) hid a single fuel rail under the doghouse and only had lines running out to the injectors; again an improvement to the in-your-face visibility.
the injectors are going to have to be visible UNLESS you can find a way to mount them inside (your plan) over each intake runner, BUT then bracketry and the injectors themselves are going to block air flow. kinda a win/lose scenario. and then there is the airmeter…. it isn't gonna fool anyone as it only vaguely resembles a FI air meter; BUT ya gotta have one
if you guys can put a man on the moon, then maybe you can do this too; but I have to say i'm not too optimistic.
What computer control are you using? I used a diy solution awhile back for another car that worked pretty well. Megasquirt is the name. At the time I soldered together my own controller, but I think you can buy assembled controllers at this point.
I'm not seeing what value that internal box adds other than mechanical support for the injectors. Seems you could come up with skeletonized mechanical support and get much better air flow.
The idea of the enclosed box is too isolate the electronics part of the injectors from the surrounding air (and possible fuel) mixture.
It may not be necessary to do this. One of the things that I am investigating.
The idea of the enclosed box is too isolate the electronics part of the injectors from the surrounding air (and possible fuel) mixture.
It may not be necessary to do this. One of the things that I am investigating.
OK, I sorta get that. Unless you use injectors which are rated to be explosion proof (like used in TBI systems, for example), you'd have a risky situation with active injectors suspended in free air.
OK, I sorta get that. Unless you use injectors which are rated to be explosion proof (like used in TBI systems, for example), you'd have a risky situation with active injectors suspended in free air.
another of my senior moments.... I seem to remember someone bolted a TBI to the side of a doghouse and it kinda sorta works????
Bill
11-13-2018, 02:11 PM
Rochester EFI plans
