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Fuel injection for my 235.
#437492 Thu Jul 31 2008 04:15 AM
Joined: Jul 2008
Posts: 93
D
Diceman Offline OP
Shop Shark
I decided to work on some of the peripheral items for my fuel injection system while I am waiting for the throttle bodies and intake manifold to arrive. First item is the distributor. I need a magnetic trigger signal for the ECM and a large cap to prevent arc over from the HEI system I am going to use. Since I am trying to keep this as nostalgic looking as possible a GM HEI is out. Too modern looking. I decided to marry a Chevy 235 distributor bottom to a Ford Duraspark top. I am going to use a GM ESC module mounted in a remote location. Timing advance will be controlled by the ECM. Attached are some pictures.

http://i532.photobucket.com/albums/ee330/diceman50/Hank%20fuel%20injection/P8080135.jpg

http://i532.photobucket.com/albums/ee330/diceman50/Hank%20fuel%20injection/P8080136.jpg

http://i532.photobucket.com/albums/ee330/diceman50/Hank%20fuel%20injection/P8080137.jpg

Last edited by Diceman; Tue Aug 26 2008 02:30 AM.
Re: Fuel injection for my 235.
Diceman #437511 Thu Jul 31 2008 05:24 AM
Joined: Oct 2003
Posts: 5,161
O
Cruising in the Passing Lane
How about the small cap HEI used on the 173 V-6? Looks nothing like the big cap version.


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Re: Fuel injection for my 235.
OldSub #437519 Thu Jul 31 2008 06:08 AM
Joined: Jul 2008
Posts: 93
D
Diceman Offline OP
Shop Shark
The small cap HEI depends on very tight clearance between the rotor and the cap to prevent arc over. I am not that confident in my machine work. I could not figure out a way to check the clearances after the cap is put on. Besides, the Ford Duraspark distributors are a lot easier (ie: cheaper) to find around here. Other than that it would be a good choice and would probably look a bit more like the stock distributor.

Re: Fuel injection for my 235.
Diceman #437862 Fri Aug 01 2008 12:47 PM
Joined: Aug 2007
Posts: 1,909
S
Grumpy old guy playing with trucks, cars, and boats
buy a second cap and cut it apart to check your clearances


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Re: Fuel injection for my 235.
Scott Danforth #438223 Sun Aug 03 2008 01:03 AM
Joined: May 2001
Posts: 8,386
Extreme Gabster
I'm interested in the EFI set-up. Things like what components you are using, 4BBL manifold or side draft, etc. Please keep us informed on your progress.


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Re: Fuel injection for my 235.
Cletis #438333 Sun Aug 03 2008 05:27 PM
Joined: Feb 2004
Posts: 22,380
H
'Bolter
Are you planning to use a sequential EFI with individual injectors for each cylinder, or a TBI? If it's got individual injectors, how do you plan to deal with the siamesed intake ports serving more than one cylinder?
Jerry

Last edited by Hotrod Lincoln; Sun Aug 03 2008 05:27 PM.

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Re: Fuel injection for my 235.
Cletis #438337 Sun Aug 03 2008 05:36 PM
Joined: Jul 2008
Posts: 93
D
Diceman Offline OP
Shop Shark
Will do Cletus. The plan at this time (subject to change) is to use a vintage Edmund's dual carb intake manifold with Retrotek throttle bodies. The electronics and sensors are all GM including the ECU which came out of a 92 Camaro 3.1 liter V6. Ignition will be via the Chevy/Ford distributor described earlier. At this time I am waiting on the throttle bodies.

http://i532.photobucket.com/albums/ee330/diceman50/Hank%20fuel%20injection/5f32_1.jpg

http://i532.photobucket.com/albums/...l%20injection/product-large_image-30.jpg


Last edited by Diceman; Tue Aug 26 2008 02:32 AM.
Re: Fuel injection for my 235.
Hotrod Lincoln #438345 Sun Aug 03 2008 06:00 PM
Joined: Jul 2008
Posts: 93
D
Diceman Offline OP
Shop Shark
Jerry, The ECM I am using came off a port injected, speed density, non sequential system. All the injectors fire at the same time. My injectors will be in the throttle bodies. Two injectors per throttle body. (4 total) Although it is not a factor on my application I think a sequential system would work with 2 injectors per runner.(6) If the injector pulses are timed correctly the fuel would be drawn into the proper cylinder since they fire at different times. This is all speculation on my part based on my experience with fuel injection.

Re: Fuel injection for my 235.
Diceman #438346 Sun Aug 03 2008 06:04 PM
Joined: Jul 2008
Posts: 93
D
Diceman Offline OP
Shop Shark
[quote=Diceman]Will do Cletus. Sorry Cletis!

Re: Fuel injection for my 235.
Diceman #438357 Sun Aug 03 2008 07:29 PM
Joined: Feb 2004
Posts: 22,380
H
'Bolter
The injectors on a non-sequential system pulse half of them at each revolution of the engine, unless you've got some really oddball system I've never heard of. At least all the GM systems I've been repairing and teaching for the past 30 years work that way. A sequential port setup has the injector nozzle pointed at the tulip section of the intake valve, and fires the injector a fraction of a crankshaft turn before the valve opens. This results in a fog of fuel behind the valve at the beginning of the intake stroke, which gets drawn into one cylinder as the valve opens. In your situation, it would probably be much simpler to go with a throttle body injector since there's no need to dedicate a single injector shot to any particular cylinder. TBI systems are much simpler to wire and control, also.
Jerry


The murder victim was drowned in a bathtub full of Rice Krispies and milk.
The coroner blamed the crime on a cereal killer!

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
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