[Gmecm] 340 EFI (longish)

Fri Feb 24 04:25:56 UTC 2006

Mike,
TX is good about preserving sheetmetal (most of the time), but terrible on
soft parts.  Too much sun down here for any sort of paint, plastic, vinyl,
or leather to survive long.  I trade sheetmetal for dash pads with a buddy
of mine from Ontario...

The early Dart/SRT-4 creature is still a figment of my imagination, but it
doesn't look like it would be hard to do now.

Scott,
The intake is set up for the injectors out of the box.  This particular
version is sort of a bastard child of the older LA engines (t-stat housing
location) and the Magnum engines on the rest.  Made my serpentine
installation more difficult than it might have been with the straight Magnum
parts.  The goal of the intake was to allow the folks with the Magnum
engines in their trucks simply swap the OEM beer barrel intake with this one
for greater rev potential.  All the other Magnum bits and pieces drop on.
Some, like the OEM 2-bbl throttle body, require an adapter which I chose not
to use for hood clearance reasons.  The injectors are also nicely angled
towards the intake valves.  Down side to that is that it cramps space needed
for the throttle body levers (which isn't a problem with the adapter...) -
note that my TB is turned 90* for that reason.

Hopes are that the EFI will make for a nice all-weather daily driver, and
killer throttle response with no worry of fuel control on the autoX course.

Clair

----- Original Message ----- 
From: "Scott Pearson" <mrcad472 at iowatelecom.net>
To: <gmecm at diy-efi.org>
Sent: Thursday, February 23, 2006 9:11 AM
Subject: Re: [Gmecm] 340 EFI (longish)

> Nice setup! Is that intake a production piece, or did you add injector
> bungs?
>
> I've always liked the small block Dart/Valiant, even better with EFI.
>
> Scott
>
> ----- Original Message ----- 
> From: <clair.davis at charter.net>
> To: "For discussion of GM EFI hardware and software" <gmecm at diy-efi.org>
> Sent: Wednesday, February 22, 2006 10:39 PM
> Subject: [Gmecm] 340 EFI (longish)
>
>
> > OK, I've managed to get off my butt and at least upload some photos of
the
> > EFI system on the old girl.  My web pages are horribly out of date,
> > without
> > much chance they will get updated very soon, now that there's a little
guy
> > (6-months old) in the house.  Still, I try to get out and tinker when I
> > can.
> > Here's the nutshell version:
> >
> > '72-model steel-crank 340, with PERHAPS 8.5:1 compression.  It had been
> > rebuilt by the previous owner, and I didn't want to do a full rebuild
and
> > take more life out of this relatively rare block, so I just freshened it
> > up
> > and went with it.  Heads are smog castings with bowl porting and port
> > matching, 2.02/1.60 valves.  Cam is a relatively mild Crane HMV272, also
> > from the spare parts bin in the garage.  It made 260hp and 300lb-ft at
the
> > rear wheels when I took it to a dyno a year ago.  It managed 13" of
vacuum
> > at idle with the carb, which is my main worry with the chip that came
with
> > my kit - I need 15.
> >
> > The kit, BTW, is a 7730 controller with a custom chip made to work with
my
> > engine combo based upon info I provided to the guys at
> > http://www.affordable-fuel-injection.com/   They also provided a new
> > wiring
> > harness, throttle body, 24# injectors, fuel pump, regulator, a "box" to
> > work
> > with my distributor, and all the sensors needed.  I supplied the intake
> > manifold, distributor (OEM Chrysler "Lean Burn" magnetic pickup), OEM
> > Dodge
> > Magnum truck fuel rails, and other various items.  I've also made some
> > substantial changes to the system in the throttle body and FPR areas, so
> > some of the parts supplied in the kit aren't on the car.
> >
> > Although I'm sure the system will run, I'm equally sure some tuning will
> > be
> > required, and that's why I've been lurking here and on DIY-EFI for the
> > last
> > 3 years or so.  Anyway, on to the photos...
> >
> > I've finally got all but the last couple of details sorted out on my
> > serpentine belt project, and can now get on with finishing up the EFI
> > install.  Here's some pics:
> >
> > Mopar Performance M1 Magnum engine EFI manifold:
> >
http://users2.ev1.net/~clairdavis/webimages/69sedan/efi/M1_Magnum_Intake-01.JPG
> >
> > OEM air cleaner installed:
> >
http://users2.ev1.net/~clairdavis/webimages/69sedan/efi/Air_Cleaner-02.JPG
> >
> > Throttle body view, with most of the OEM Magnum engine serpentine system
> > in
> > place:
> >
http://users2.ev1.net/~clairdavis/webimages/69sedan/efi/TB_Serp_On-small.JPG
> >
> > The serpentine system was a tedious project in and of itself.  I did the
> > upgrade so that I could have a higher-amp alternator to be sure the EFI
> > was
> > getting enough juice, and to also run the electric fan and AC system
that
> > is
> > in the works.  Serp upgrade photos...
> >
> > Belt Installed:
> >
http://users2.ev1.net/~clairdavis/webimages/69sedan/upgrades/serpentine/Belt_Installed-03.jpg
> >
> > New water pump pulley clearance (the mag system is at least an inch
> > shorter
> > than the LA)
> >
http://users2.ev1.net/~clairdavis/webimages/69sedan/upgrades/serpentine/Serp_Fan_Clearance-01.JPG
> >
> > Nature abhors a vacuum... a fatter Volvo fan eats up some of the
new-found
> > space:
> >
http://users2.ev1.net/~clairdavis/webimages/69sedan/upgrades/serpentine/Serp_Fan_Clearance-02.JPG
> >
> >
> > That about get us caught up with where we are as of three weeks ago.  No
> > progress since then, too many honey-do's and crappy weather lately.  The
> > goal is to be running by late March...
> >
> > Clair
> > 69 Valiant 340/7730
> > Fort Worth, TX
> >