EFI conversion for 392

[Powerflite]

I am looking into converting my hot-heads 4bbl manifold to EFI. Does anyone know what size and type of injectors I should use, as well as the throttle body? Is Megasquirt the way to go for the control or is there something better or easier? My current plan is to purchase parts separately and build it, but does anyone know of an easier way such as getting a setup for a 351 Ford Cleveland motor and making it work? It should be painfully obvious that I am new to EFI and would appreciate any input.

[George]

There was an article in one of the Mopar magazines where a Ford EEC-4 systems was used, but it's buried now.

[budmspeeco]

Holley used to make a 2 barrel and a 4 barrel replacement fuel injection kit. Basically a bolt-on deal. A friend of mine used a 2 bbl. setup on his 4 bbl. wrecker and he said the power was unbelievable. It would spin the dually tires on the truck with ease. He took it off because his drivers were tearing up the truck. I have it now. Never put it on anything. If you want to try it I would loan it out. It needs a little TLC . The wiring did not fare too well . Try your local speed shop to see if they still make them. Edelbrock is also big into efi. Give them a call. Buddy

[MAW]

I'm using the tunnel ram base from PAW along with a MegaSquirt controller on my 331 Hemi project A fabricated top will house a pair of side-by-side throttle bodies, each one fed by a T04B turbo. I'll be sinking a #65 low-Z injector into each port runner.

I bought the PCB and CPU for the MegaSquirt since I had everything else laying around the shop already. Took about 2 hours to build/test (a good portion of that time was spent scrounging in parts bins for the right part). Good documentation and support on their forums.

Cheers, Mark

[focarman]

Hi Guys!
I am new to the site, as I just joined today.
I have been into Hemis since the 60's, and have worked with fuel injection for them since then also.
I have an EFI conversion for all the early Hemis including the DeSoto, and Dodge versions that work with the Hilborn units which I have been converting for years.
I have adapters for the 4-bbl intakes too if you want to fabricate your own system.
I am also making a new set of throttle bodes that bolt to the Hot Heads Weber intakes they are making, and will be offered by them very soon, along with a throttle body make just for the Detroit/GM style blowers that is low profile, and with EFI.
Here is my website... http://foxengineering-efi-fuel-injectio ... mopar.com/
You can contact me also at focarman@aol.com
Great site, and hope I can help some of you.

Fran Olson
~{:>)

[mart]

A few tips to figure injector sizes. For a normal,
gasoline burning; naturally aspirated engine you
need about .5 lb. of fuel per horsepower, per
hour - ie -.5 BSFC. at maximum output. A
turbocharged or supercharged engine's BSFC
is closer to .65 or .7 at maximum output
Theoretically then, to make 400 hp, naturally
aspirated, you would need about 200 lb. of fuel
per hour. Dividing that by 8 injectors, you would
require 50 lb. per hour for each injector. That's
only theoretical though, because it's assuming
your injectors are operating at a 100 % duty
cycle and that everything else in the system
is 100 % efficient too. In the real world, with
a Megasquirt and other similar controllers,
figure on more like a 65 or 70 % duty cycle
to be safe ( an 80 % duty-cycle is *probably*
realistic). And you should also allow a bit
more fuel flow too, in case the BSFC goes
slightly above .5 lb./hr norm. A 'real world'
calculation for injector size therefore would
go something like this: Injector size = horsepower
X .55 BSFC - divided by the number of injectors
- (in this case, 8 ), divided by 70% duty-cycle.
This is a conservative, but safe calculation that
would give you injectors somewhat larger than what
would be the theroretically correct minimum, as it
uses a slightly high .55 BSFC and a somewhat low
70% duty cycle. You can also cheat a bit and go a
bit smaller on injector size by raising the fuel pressure
somewhat above the normal pressure that the injector
flow rate is calculated at. But the above calculation
will get you in the ballpark and be safe at normal fuel
pressures.

mart
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[speedicusmaximus]

Don't know just how long this company have been going, or how good they are, but try this link:

http://www.retrotekspeed.com/index.php
Retrotek - Home

They do efi kits for Mopars, amongst others. They use a throttle body that resembles a 4bbl carburetor, but can do other, more nostalgic looking stuff too.

Mike