93 5.2 mangum into a 73 B-body

Posted By: moparkid88

93 5.2 mangum into a 73 B-body - 10/22/09 07:52 PM

I got a 73 charger and im putting a 5.2 magnum in it.Im also goin to swap in the a518 along with it. I was woundering how hard it would be to swap in all the efi stuff or if i should just buy an intake and carburate it. I have the whole complete truck that the motor is in so i have everything i would think. Any help would be awsome. Thankyou

Posted By: patrick

Re: 93 5.2 mangum into a 73 B-body - 10/22/09 08:23 PM

you'll have to upgrade the fuel system to high pressure (IIRC early magnum computers need ~48 PSI)

if you want more zip, get hughes 1110 springs, retainers from a few junkyard 2.2L/2.5L's out of late 80's mopars, and get the cam reground by www.bulletracing.com with their HR259/316 lobe for both intake and exhaust. a stock computer should handle this cam, but you may need to upgrade to 24lb/hr injectors.

Posted By: moparkid88

Re: 93 5.2 mangum into a 73 B-body - 10/26/09 03:26 AM

Does anyone know how hard it would be to swap in the efi with all the wiring and what not or would the best bet be to carburate it? Also what does it take to put the a-518 behind it, the car has a factory 904 if you need to know that...

Posted By: Intense RT Dan

Re: 93 5.2 mangum into a 73 B-body - 10/26/09 04:36 AM

I wouldn't bother with the efi unless it was OBD 2 for tuning purpose. I'd just carb it.

Posted By: Intense RT Dan

Re: 93 5.2 mangum into a 73 B-body - 10/26/09 04:40 AM

If you have to use the obd 1 efi, you'll have to look into using the trans that will work with the crank position sensor flexplate. (not familiar enough with the trans swapping but it has been done) If you can manage that, next step would be to notch the bellhousing so the cps can still go through.

Posted By: joedust451

Re: 93 5.2 mangum into a 73 B-body - 10/26/09 04:50 AM

You'll most likely not get too many responces on this type swap, it hasn't caught on real heavy yet, most still stick with the LA swaps, its not that hard really (thats going the simple route), but there is still more involved then one may tell you, if you were going carb'd & keeping the 904 & installing all the older pulleys, i could help you out as i'm in the middle of doing it on my 71 dart, as for the trans, the 518 needs a device to make it shift if your not useing the computer, plus you'll need to shorten the driveshaft, don't know about the trans mount, but running a floor shifter will help free up linkage issues you might incounter, don't know about what all involved on the computer install, but i'm sure you'll have a project on your hands doing this swap unless you keep it simple by going carb'd, use the 904, run the older pulleys.

If you go the simple route & go carb'd, here is some of the things you'll need.

Crosswing RPM airgap, i got mine for 189.00 shipped from KMJ Performance out of Aims Iowa.

Flex plate if you run the 904, i found one from a later model, starting around 98/99 they started putting weights on the flexplate, this way you can run no weights on your converters, but you will need to longgate one of the holes so the 904 converter will fit.

Motor mounts/brackets, if this car had a 318, you should be able to use those.

Timing cover, if you keep the reverse flow WP & serp. system, you can use the one thats on the engine, if you go with the older set-up, you'll have to use an LA timing cover.

Oil pan, you will need the pan off the LA 318, but you also need to use the LA oil pan gasket, the magnum one will not work.

Fuel pump, if you go elec., you won't need a cam extention Part# Hug 7013, but if you go mech. pump you will need this, now this is IF you stay with the factory cam, even if you have re-ground, you can get an aftermarket cam that has the extention built in, but there around 350.00 bucks.

I sent my stock cam off to Bullet cams for a re-grind, it was 150.00.

Posted By: DaytonaTurbo

Re: 93 5.2 mangum into a 73 B-body - 10/26/09 06:11 AM

If you use the motor, trans, wiring and computer out of your donor truck it will work, but you will need to attack a few issues.

The motor will drop right in just fine and bolt up you old 318 motor mounts. The 518 should fit but you will likely have to take your angle grinder and grind down a few of the reinforcing ribs on the outside of the case to get it to fit. Another member came up with this and it seems to work great and do no harm. You need to do this because the 518 is fatter than the 904 or 727 it's replacing.

You will have to custom weld your transmission mounting bracket. You can take your old bracket and cut the mounting ears off it and throw away the rest. The middle part of it will have to be custom fabbed by you. No way to get around this part. Other than that the mechanical install is not too difficult. Driveshaft will need to be shortened, you can measure for this after you get the trans installed.

Fuel system will need to be upgraded to a high-pressure efi pump and have an efi pressure regulator and return line. You can use a walbro gsl-392 universal in-line pump if you don't want to custom fab your own internal pump. Still not as good as original because your carb tank doesn't have a sump, although you can get by without it.

Then you get down to the wiring. It's not overly difficult, just very time consuming and requires you to gain an understanding of the mopar truck efi system. When I did a conversion similar like this I at least had a factory service manual pinout diagram of the wiring harness and a diagram showing all the engine control functions of the wiring harness. Basically you need to disect the wiring harness and just keep the sections of the harness that control the engine and junk the other stuff like the wiring for the trucks headlights, turn signals, etc. Like I said, not overly tough, just time consuming.

Going to carb presents it's own challenges but they are much easier in comparisin. You can buy the edelbrock rpm air gap intake which will bolt to the magnum heads, and need to run an electric fuel pump because the magnum's cam doesn't have provisions to run a mechanical fuel pump. Then you need to rig up either switches or a few sensors to control the overdrive and/or lockup converter on the transmission, however those mods are well documented and instructions are out there.

No doubt going carb would be easier, but if you want the driveability of efi, it certainly can be done. Main drawback of going with the factory efi is lack of tunability. You can only do so much for mods because there's no real way to recalibrate the stock ecu in those trucks as far as I know.

Posted By: patrick

Re: 93 5.2 mangum into a 73 B-body - 10/26/09 02:57 PM

Quote:

You'll most likely not get too many responces on this type swap, it hasn't caught on real heavy yet, most still stick with the LA swaps, its not that hard really (thats going the simple route), but there is still more involved then one may tell you, if you were going carb'd & keeping the 904 & installing all the older pulleys, i could help you out as i'm in the middle of doing it on my 71 dart, as for the trans, the 518 needs a device to make it shift if your not useing the computer, plus you'll need to shorten the driveshaft, don't know about the trans mount, but running a floor shifter will help free up linkage issues you might incounter, don't know about what all involved on the computer install, but i'm sure you'll have a project on your hands doing this swap unless you keep it simple by going carb'd, use the 904, run the older pulleys.

to run a pre-96 OD (42/46RH) on a carbed app, you need 2 normally open pressure switches tapped into the governor port, a normally open vacuum switch hooked to manifold vaccuum, and a toggle switch as an OD cancel. that's how mine is set up.

Quote:

Crosswing RPM airgap, i got mine for 189.00 shipped from KMJ Performance out of Aims Iowa.

or mopar magnum M1 dual plane, or eddie magnum air gap, or redrill the heads, and any LA intake.

Quote:

Flex plate if you run the 904, i found one from a later model, starting around 98/99 they started putting weights on the flexplate, this way you can run no weights on your converters, but you will need to longgate one of the holes so the 904 converter will fit.

non issue since he's using an internal balanced 5.2

Quote:

Oil pan, you will need the pan off the LA 318, but you also need to use the LA oil pan gasket, the magnum one will not work.

both magnum 5.2 and 5.9 need an LA360 car pan and gasket.

Quote:

Fuel pump, if you go elec., you won't need a cam extention Part# Hug 7013, but if you go mech. pump you will need this, now this is IF you stay with the factory cam, even if you have re-ground, you can get an aftermarket cam that has the extention built in, but there around 350.00 bucks.

I sent my stock cam off to Bullet cams for a re-grind, it was 150.00.

I also had bullet regrind my roller cam (LA roller block from my 5th ave, magnum heads), I used their HR259/316 lobe for both the intake and exhaust, and hughes 1110 springs with chrysler 2.2L/2.5L retainers, works great, makes great power.

Posted By: joedust451

Re: 93 5.2 mangum into a 73 B-body - 10/26/09 03:20 PM

Quote:

Quote:

You'll most likely not get too many responces on this type swap, it hasn't caught on real heavy yet, most still stick with the LA swaps, its not that hard really (thats going the simple route), but there is still more involved then one may tell you, if you were going carb'd & keeping the 904 & installing all the older pulleys, i could help you out as i'm in the middle of doing it on my 71 dart, as for the trans, the 518 needs a device to make it shift if your not useing the computer, plus you'll need to shorten the driveshaft, don't know about the trans mount, but running a floor shifter will help free up linkage issues you might incounter, don't know about what all involved on the computer install, but i'm sure you'll have a project on your hands doing this swap unless you keep it simple by going carb'd, use the 904, run the older pulleys.

to run a pre-96 OD (42/46RH) on a carbed app, you need 2 normally open pressure switches tapped into the governor port, a normally open vacuum switch hooked to manifold vaccuum, and a toggle switch as an OD cancel. that's how mine is set up.

Quote:

Crosswing RPM airgap, i got mine for 189.00 shipped from KMJ Performance out of Aims Iowa.

or mopar magnum M1 dual plane, or eddie magnum air gap, or redrill the heads, and any LA intake.

Quote:

Flex plate if you run the 904, i found one from a later model, starting around 98/99 they started putting weights on the flexplate, this way you can run no weights on your converters, but you will need to longgate one of the holes so the 904 converter will fit.

non issue since he's using an internal balanced 5.2

Quote:

Oil pan, you will need the pan off the LA 318, but you also need to use the LA oil pan gasket, the magnum one will not work.

both magnum 5.2 and 5.9 need an LA360 car pan and gasket.

Quote:

Fuel pump, if you go elec., you won't need a cam extention Part# Hug 7013, but if you go mech. pump you will need this, now this is IF you stay with the factory cam, even if you have re-ground, you can get an aftermarket cam that has the extention built in, but there around 350.00 bucks.

I sent my stock cam off to Bullet cams for a re-grind, it was 150.00.

I also had bullet regrind my roller cam (LA roller block from my 5th ave, magnum heads), I used their HR259/316 lobe for both the intake and exhaust, and hughes 1110 springs with chrysler 2.2L/2.5L retainers, works great, makes great power.

Patrick, those other intakes are 100.00 more plus shipping, & the Eddy intake has gasket allign. issues, i know from exsperiance with that, plus the Crosswind will work on either engine (LA or Mag.), its drilled for both, the crosswind has had very good feedback on performance too, its a very nice piece for the price. I took your advice & sent my cam to Bullet, he set it up for .478 lift. so he could drop it down to 112 & get alittle more .dur out of it, i'm sure it'll work good, he & I felt it would produce more power in those 2 areas vs. just .022" more lift.

Posted By: Andrewh

Re: 93 5.2 mangum into a 73 B-body - 10/26/09 04:18 PM

search for wedgeman I think
he dropped a 94 5.9 into his car and got the factory computer to work. might be able to help with yours.

Posted By: moparkid88

Re: 93 5.2 mangum into a 73 B-body - 02/25/12 07:35 AM

sorry to bump and ancient post but im retiring the truck this year to finally swaper into the charger will be going carburated...hope all goes well... Where do i get the vaccum switches for the od? Trans is a non-lock up so a 727 converter will work also??