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Stock Magnum fuel inj. rate? #2633978
03/18/19 10:14 AM
03/18/19 10:14 AM
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Guitar Jones Offline OP
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Does anyone know the rating of the stock injectors for the 5.2 and 5.9 engines?


"Follow me the wise man said, but he walked behind"


'92 D250 Club Cab CTD, 47RH conversion, pump tweaks, injectors, rear disc and hydroboost conversion.
'74 W200 Crew Cab 360, NV4500, D44, D60 and NP205 divorced transfer case. Rear disc and hydroboost coming soon!
2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi.
Re: Stock Magnum fuel inj. rate? [Re: Guitar Jones] #2634007
03/18/19 11:27 AM
03/18/19 11:27 AM
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Last edited by ZIPPY; 03/19/19 01:22 PM.

Rich H.

Esse Quam Videri




Re: Stock Magnum fuel inj. rate? [Re: ZIPPY] #2634316
03/19/19 09:11 AM
03/19/19 09:11 AM
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Manitoba, Canada
DaytonaTurbo Offline
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5.2 Magnum 92-95 18.2
5.2 Magnum 96-01 23.2
5.9 Magnum 93-95 24.5
5.9 Magnum 96-01 23.2

Also worth noting, those flow ratings are at the standard 43.5psi, however the OBD1 engines (1995 and prior) ran at an actual fuel pressure of 35psi and the 96+'s ran at 49psi.

Re: Stock Magnum fuel inj. rate? [Re: DaytonaTurbo] #2634349
03/19/19 10:29 AM
03/19/19 10:29 AM
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Guitar Jones Offline OP
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Originally Posted by DaytonaTurbo
5.2 Magnum 92-95 18.2
5.2 Magnum 96-01 23.2
5.9 Magnum 93-95 24.5
5.9 Magnum 96-01 23.2

Also worth noting, those flow ratings are at the standard 43.5psi, however the OBD1 engines (1995 and prior) ran at an actual fuel pressure of 35psi and the 96+'s ran at 49psi.


Thanks for the info.

More to think about now since I'm using a 93 5.2.

Is there an easy way to get the fuel pressure up to the 96 49 psi? I'm thinking those smaller 18.2 psi injectors may be fine at 49 psi.


"Follow me the wise man said, but he walked behind"


'92 D250 Club Cab CTD, 47RH conversion, pump tweaks, injectors, rear disc and hydroboost conversion.
'74 W200 Crew Cab 360, NV4500, D44, D60 and NP205 divorced transfer case. Rear disc and hydroboost coming soon!
2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi.
Re: Stock Magnum fuel inj. rate? [Re: Guitar Jones] #2634360
03/19/19 11:16 AM
03/19/19 11:16 AM
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could it be as simple as adjusting or swapping the pressure regulator ? i can't see there being much difference in the intank pump.
not that i haven't been wrong before ! biggrin
beer

Re: Stock Magnum fuel inj. rate? [Re: DaytonaTurbo] #2634365
03/19/19 11:30 AM
03/19/19 11:30 AM
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I previously read that all of the pre-1996 Magnum 5.2 injectors were 18.2 lb/hr at 35 +/- 5 psi
but I have now personally seen pre-1996 Ram trucks with Magnum 5.2 V8s that had 53030262 black injectors like my 1995 Magnum 5.9V8 had from the factory. At least one Magnum 5.2 V8 Ram owner told me his 53030262 injectors were that way when he bought the truck new.

I have not paid attention to 5.2 Magnums in Dakotas so I cannot say about that.

Remember a few years ago when E booger did the injector cleaning article and by eye balling pictures we found that his cleaning company had shipped him 53030262 injectors rated 24.5 to replace the original 23.2 lb/hr units shown in before photos?

Re: Stock Magnum fuel inj. rate? [Re: 360view] #2634373
03/19/19 11:44 AM
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I have a personal hunch that the Magnum Beer Barrel intake manifold runers at the rear (#7 and #8 ) flow more air than the front six runners.

Putting 24.5 injectors in these back two cylinders and 23.2 injectors in the front is something to consider to balance air to fuel ratio, and prevent full throttle pinging in cylinders 7 and 8.

Injectors catch screens on #7 and #8 tend to catch any crud coming down the fuel lines, such as bits of degraded hose liner.

Re: Stock Magnum fuel inj. rate? [Re: moparx] #2634393
03/19/19 12:23 PM
03/19/19 12:23 PM
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Guitar Jones Offline OP
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Originally Posted by moparx
could it be as simple as adjusting or swapping the pressure regulator ? i can't see there being much difference in the intank pump.
not that i haven't been wrong before ! biggrin
beer


The earlier ones had a return system. Not exactly sure when the returnless system was incorporated. 94 maybe?


"Follow me the wise man said, but he walked behind"


'92 D250 Club Cab CTD, 47RH conversion, pump tweaks, injectors, rear disc and hydroboost conversion.
'74 W200 Crew Cab 360, NV4500, D44, D60 and NP205 divorced transfer case. Rear disc and hydroboost coming soon!
2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi.
Re: Stock Magnum fuel inj. rate? [Re: Guitar Jones] #2634504
03/19/19 05:33 PM
03/19/19 05:33 PM
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I was digging around rockauto. GM used a regulator that looked very similar to the 93 dodge pressure regulator. It was a v8 and it may have been an e85 model.

Re: Stock Magnum fuel inj. rate? [Re: Guitar Jones] #2634544
03/19/19 07:31 PM
03/19/19 07:31 PM
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Manitoba, Canada
DaytonaTurbo Offline
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Originally Posted by Guitar Jones
Originally Posted by DaytonaTurbo
5.2 Magnum 92-95 18.2
5.2 Magnum 96-01 23.2
5.9 Magnum 93-95 24.5
5.9 Magnum 96-01 23.2

Also worth noting, those flow ratings are at the standard 43.5psi, however the OBD1 engines (1995 and prior) ran at an actual fuel pressure of 35psi and the 96+'s ran at 49psi.


Thanks for the info.

More to think about now since I'm using a 93 5.2.

Is there an easy way to get the fuel pressure up to the 96 49 psi? I'm thinking those smaller 18.2 psi injectors may be fine at 49 psi.


[Linked Image]

The GM LS1 fuel filter/regulator works at 59 psi and will make your 18 lb @ 43.5 psi injectors flow 21 lb @ 59 psi.

Re: Stock Magnum fuel inj. rate? [Re: DaytonaTurbo] #2634611
03/19/19 09:44 PM
03/19/19 09:44 PM
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97 was the 1st year for the non-return line on the efi. If you use the fuel return pump, it creates too much pressure on the non-return system. To reduce the pressure requires adding a regulator with a pressure return line. Gene

Re: Stock Magnum fuel inj. rate? [Re: poorboy] #2635081
03/21/19 08:04 AM
03/21/19 08:04 AM
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Eastern Ontario
shaker340 Offline
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Gene, I am also using the GM LS1 regulator and we have plumbed the return back to the tank. But we are using this on a stock 99 5.2L that had no return as you mentioned. Do you see any issues running a higher pressure at 59 vs 55?

Mike


2008 Challenger SRT8
1940 Chrysler Royal coupe
Re: Stock Magnum fuel inj. rate? [Re: shaker340] #2635116
03/21/19 09:44 AM
03/21/19 09:44 AM
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I did some more digging and my previous numbers were all wrong. See revised info:

5.2 Injector (92-93): Siemens 53007809; 18.4lb/hr @ 39psi
5.2 Injector (94-95): Siemens 53030262; 24.6lb/hr @ 39psi
5.2 Injector (96+): Siemens 53030778; 23.7lb/hr @ 49psi

5.9 Injector (92): Last year for TBI
5.9 Injector (93-95): Siemens 53030262; 24.6lb/hr @ 39psi
5.9 Injector (96+): Siemens 53030778; 23.7lb/hr @ 49psi

Last edited by DaytonaTurbo; 03/21/19 09:47 AM.
Re: Stock Magnum fuel inj. rate? [Re: DaytonaTurbo] #2635138
03/21/19 10:45 AM
03/21/19 10:45 AM
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Guitar Jones Offline OP
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Originally Posted by DaytonaTurbo
I did some more digging and my previous numbers were all wrong. See revised info:

5.2 Injector (92-93): Siemens 53007809; 18.4lb/hr @ 39psi
5.2 Injector (94-95): Siemens 53030262; 24.6lb/hr @ 39psi
5.2 Injector (96+): Siemens 53030778; 23.7lb/hr @ 49psi

5.9 Injector (92): Last year for TBI
5.9 Injector (93-95): Siemens 53030262; 24.6lb/hr @ 39psi
5.9 Injector (96+): Siemens 53030778; 23.7lb/hr @ 49psi


Thank you very much, that makes it much easier to get a larger injector.


"Follow me the wise man said, but he walked behind"


'92 D250 Club Cab CTD, 47RH conversion, pump tweaks, injectors, rear disc and hydroboost conversion.
'74 W200 Crew Cab 360, NV4500, D44, D60 and NP205 divorced transfer case. Rear disc and hydroboost coming soon!
2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi.
Re: Stock Magnum fuel inj. rate? [Re: Guitar Jones] #2635202
03/21/19 12:40 PM
03/21/19 12:40 PM
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If you want 49 psi, its easiest to use a fuel pump module from a 94-95 1500/2500 dodge truck. It will fit a 91-93 ram fuel tank- BUT the regulator has to be swapped to a 96 later regulator. Pretty sure that 49 psi and OBD 2 started the same year.

I'm running 49 psi in my 88 with a 5.9 magnum, stock 93 5.9 ecm and the 2001-2003 red injectors- runs great- 14 mpg with egr beer barrel
Also running 49 psi in my 92 with 5.9, stock 93 ecm and stock 99 injectors- got a vacuum leak so it runs ok but not at full potential yet.

Theres a guy on ebay selling rebuilt injectors as a "upgrade" for the 5.2/5.9 red tops, but they are bosch 702s (i think, maybe 712s) that flow at 21 lbs/hr at 3 bar. That works out to like 22+ at 49 psi. Runs great when I had them on the 88 as well. They are in minnesota iirc

I've tried running the 99 5.2 injectors in the 92 when it had a 5.2 and it was WAY too much fuel. The ford yellow tops really run great in a 5.2

Return system was used in 92-93 5.2 rams and some jeeps with the 5.2, maybe til 94?. i'm not a jeep guy.

I've come to the grim realization that the intake is the biggest choke in the magnum system, for 2 reasons: the huge amount of heat transmitted to the air charge and the huge plenum volume/dead space. (ie stick with close to stock injector unless turbo/supercharge/aftermarket fuel control)

Last edited by jerseybud; 03/21/19 12:41 PM.
Re: Stock Magnum fuel inj. rate? [Re: jerseybud] #2635449
03/22/19 07:35 AM
03/22/19 07:35 AM
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As an aside, check out what this guy is doing with the stock magnum intakes! I want to get the plates when I redo my truck's motor, myself!
http://utawesomeperformance.com/index.html
Maybe have the bottom coated with a heat rejecting ceramic, also?

Re: Stock Magnum fuel inj. rate? [Re: kowalski440] #2635456
03/22/19 08:03 AM
03/22/19 08:03 AM
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http://utawesomeperformance.com/kegger-vrp.html

Shows the influence of plenum volume as a factor in intake manifold design.

Unsaid is how this mod affects highway towing hill climbing in the 1500-2500 rpm range.







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