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I think some form of nozzle would be necessary to atomize the fuel when it is injected into the air stream. With a single big injector firing into a central chamber of the spider the correct amount of fuel will be delivered but it would still be in liquid form in the spider tubes.
I think some form of nozzle would be necessary to atomize the fuel when it is injected into the air stream. With a single big injector firing into a central chamber of the spider the correct amount of fuel will be delivered but it would still be in liquid form in the spider tubes.
You are probably right. I said at the outset that it was a goofy idea.
I know Rochester FI backwards and forwards. EFI.... well, I know only what I've read.
Even goofy ideas sometimes lead to brilliant ideas.
I gotta million of'em.
Instead of cluttering the inside of the plenum with nozzles and other stuff which could impede air flow, do this:
Punch a couple of holes in the floor of the plenum and mount a pair of upward pointing nozzles which can spray fuel into the plenum. Locate one nozzle near the forward 4 ram tubes and the other near the rear 4 ram tubes.
Instead of cluttering the inside of the plenum with nozzles and other stuff which could impede air flow, do this:
Punch a couple of holes in the floor of the plenum and mount a pair of upward pointing nozzles which can spray fuel into the plenum. Locate one nozzle near the forward 4 ram tubes and the other near the rear 4 ram tubes.
Interesting idea. Sort of a dual throttle body setup.
Which gives me an idea, what about modifying the inside of the plenum so that it literally becomes a dual throttle body arrangement?
Has anyone ever considered / tried to "make" a baseplate / manifold for a Rochester FI system by cutting down an aluminum intake manifold of some sort, even a old GM vintage intake?
Has anyone ever considered / tried to "make" a baseplate / manifold for a Rochester FI system by cutting down an aluminum intake manifold of some sort, even a old GM vintage intake?
given the correct tools and equipment it's certainly doable; I made a manifold for mounting Rochester FI on a 383 Plymouth using tube steel and plate
Just a suggestion. You will want to very carefully examine the welds on your new plenum. Have it dye penatrant checked. Mine had some cracks and I had true expert help to fix it. My golf partner was an RPI graduate metalugist/welding engineer and president of the LA chapter of the American Welding Society. The welder was an aluminum TIG expert and the two of them spent a full day repairing two small cracks. The casting metal is very dirty and they used every trick in their bag to get good sold repairs. It's still perfect 35 years later.
What about simulating a cross fire injection setup.
Use two injectors mounted inside the plenum, each one centered over the 4 intake runners.
Something like this...
And while I am thinking about it, does anyone have a good picture of the inside of a 63-65 plenum. There was one posted a while back that had rulers on top of it for specifications. Any chance of getting another picture without the rulers.
injectors plus the caps are pretty long (although there are some shorties…), I don't think you have enough room above the runners without cutting them down (which as I said, I wouldn't do...)
injectors plus the caps are pretty long (although there are some shorties…), I don't think you have enough room above the runners without cutting them down (which as I said, I wouldn't do...)
Bill
I agree. Cut the runners and you lose noticeable mid-range grunt in exchange for questionable benefit north of 8000 RPM.
I posted these photos earlier, but it shows what I intended to put together for my 63. Only thing lacking in these photos are the fuel lines. You may note that I altered the plenum holes to accept injectors. The blocks you see in the photo are to hold down the injector, feed fuel from the fuel tubing, and hide the wiring. The blocks will be painted black to look like the original ones and are held down by a double ended stud that threads into both the block and the plenum's existing 1/4 hole. I've thought about using the air meter and adding sensors to it, but that would ruin good air meter, so I got a stock throttle body and fabbed an adaptor. It uses a FAST EZEFI multiport system.
Right now I planning to assemble it all on the 383 I'm building.
Last edited by Vettrocious; 06-19-2018 at 08:01 PM.
I posted these photos earlier, but it shows what I intended to put together for my 63. Only thing lacking in these photos are the fuel lines. You may note that I altered the plenum holes to accept injectors. I blocks you see in the photo are to hold down the injector, feed fuel from the fuel tubing, and hide the wiring. The blocks will be painted black to look like the original ones and are held down by a double ended stud that threads into both the block and the plenum's existing 1/4 hole. I've thought about using the air meter and adding sensors to it, but that would ruin good air meter, so I got a stock throttle body and fabbed an adaptor. It uses a FAST EZEFI multiport system.
Right now I planning to assemble it all on the 383 I'm building.
what are you going to use for accelerator linkage? I suggest a cable as my bellcrank linkage is kind of 'notchy' going over center.
06-18-2018, 09:20 AM
