5.9 Magnum upgrades?
#1
5.9 Magnum upgrades?
I have a 5.9 Magnum that I am going to swap into my 98 Jeep Grand Cherokee along with a 5 speed transmission. While the 5.9 is out I plan on doing a new water pump and all other cooling system components, intake plenum gaskets along with the Kegger mod, valve cover gaskets, oil pan gasket, rear main seal, and new timing chain and components. For performance I am getting the Harland Sharp 1.7 roller rockers, bigger throttle body, Davis ignition kit from Summit racing with Autolite 3923 plugs, some kind of air intake, shorty center dump headers with a 2.5" true dual exhaust and I am going to have it tuned by Flyin Ryan. Any other maintenance or performance upgrades I should do without being too expensive?
#2
I have a 5.9 Magnum that I am going to swap into my 98 Jeep Grand Cherokee along with a 5 speed transmission. While the 5.9 is out I plan on doing a new water pump and all other cooling system components, intake plenum gaskets along with the Kegger mod, valve cover gaskets, oil pan gasket, rear main seal, and new timing chain and components. For performance I am getting the Harland Sharp 1.7 roller rockers, bigger throttle body, Davis ignition kit from Summit racing with Autolite 3923 plugs, some kind of air intake, shorty center dump headers with a 2.5" true dual exhaust and I am going to have it tuned by Flyin Ryan. Any other maintenance or performance upgrades I should do without being too expensive?
Replace all your expansion plugs (freeze plugs) along with a high volume oil pump. This will extend the life of the engine quite a bit and the expansion plugs are real boogers to replace in the car.
#3
If it was me, instead of roller rockers, I would put that money towards a different camshaft and springs. Roller rockers will give a little more lift, but no more duration. Also, the factory springs, are weak and close to max lift when new.
.Another thing , if possible I would go with long tube headers.
Talk to your tuner, but I would put those 2 mods ahead of bigger throttle body, ignition kits and shorty headers especially if money is tight.
.Another thing , if possible I would go with long tube headers.
Talk to your tuner, but I would put those 2 mods ahead of bigger throttle body, ignition kits and shorty headers especially if money is tight.
Last edited by 93 ragtop; 08-02-2020 at 03:10 PM.
#4
If it was me, instead of roller rockers, I would put that money towards a different camshaft and springs. Roller rockers will give a little more lift, but no more duration. Also, the factory springs, are weak and close to max lift when new.
.Another thing , if possible I would go with long tube headers.
Talk to your tuner, but I would put those 2 mods ahead of bigger throttle body, ignition kits and shorty headers especially if money is tight.
.Another thing , if possible I would go with long tube headers.
Talk to your tuner, but I would put those 2 mods ahead of bigger throttle body, ignition kits and shorty headers especially if money is tight.
#5
Not a lot of price difference between the rockers, and a cam/springs.... You are already going to get a tune, so, that isn't an issue. Likely get a lot more bang for your buck as well.
That said, the 1.7 rockers don't increase advertised duration, but, they DO increase duration at .050 lift...... due to the higher ratio, valves will open sooner, and stay open (at .050 or greater) longer. It's a good upgrade for an otherwise stock motor, good for about 10 hp/tq.
That said, the 1.7 rockers don't increase advertised duration, but, they DO increase duration at .050 lift...... due to the higher ratio, valves will open sooner, and stay open (at .050 or greater) longer. It's a good upgrade for an otherwise stock motor, good for about 10 hp/tq.
#6
#7
That said, the 1.7 rockers don't increase advertised duration, but, they DO increase duration at .050 lift...... due to the higher ratio, valves will open sooner, and stay open (at .050 or greater) longer. It's a good upgrade for an otherwise stock motor, good for about 10 hp/tq.
Agreed, but it is such a slight amount of duration. 1or maybe 2 degrees?
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#10
Didnt think about the headers not being made for a jeep.
https://www.summitracing.com/parts/d...grand-cherokee
Block huggers are another option but they are not made for the magnum only the LA's. You can mod them to match to a magnum.