7.3 Or 5.9

TEICHIN641

TEICHIN641

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Jul 10, 2007
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I Am Looking To Build A Engine For My Truck, I Could Either Build The 7.3 That I Have Now, Are Swap It Out For The 5.9 After Looking At The Prices On Doing This It Is Going To Take A Lot Of Cash To Build The 7.3 And Get Maby 600hp, Would It Be Cheeper To Do The Swap And Build A 5.9
 
TEICHIN641 said:
I Am Looking To Build A Engine For My Truck, I Could Either Build The 7.3 That I Have Now, Are Swap It Out For The 5.9 After Looking At The Prices On Doing This It Is Going To Take A Lot Of Cash To Build The 7.3 And Get Maby 600hp, Would It Be Cheeper To Do The Swap And Build A 5.9
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The short answer. YES!!

Why do you think most 7.3 guys give up the goat and go for Godzilla? It is the best diesel engine to modify for huge power, period. I think the CR trucks are becoming the way to go. I am just a little guy these days, but my 525 horse was made with about $4000 of aftermarket parts. Not to mention the size of internal parts like the rods when compared. If you have tons of money to build the 7.3 go for it, but if you budget isn't huge....go 5.9 and you won't regret it.
 
Do you think the internal parts comparison is fair?
I do agree that the Cummins would probably be the best way to go for big power but since you have two less cylinders with about the same displacement, the Cummins can afford to have bigger parts because there is less of them.
Not that I have any insight on this because I'm no engine builder, but it makes sense to me LOL LOL
 
nummit said:
Do you think the internal parts comparison is fair?
I do agree that the Cummins would probably be the best way to go for big power but since you have two less cylinders with about the same displacement, the Cummins can afford to have bigger parts because there is less of them.
Not that I have any insight on this because I'm no engine builder, but it makes sense to me LOL LOL
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Is it fair to match a 7500lb 600 horse truck against a 6000lb 600 horse truck? Fair enough. And the displacement of 5.9 vs. 7.3 is nowhere near "about the same" I am not an engine builder either but if I wanted big power and big strength i'll be attracted to the Cummins first.
 
What Engine Would You Recomend The 12v Or The 24v

I Have 20 K To Put Into Whatever Engine I Decide To Build Up
 
CumminAtYa said:
Is it fair to match a 7500lb 600 horse truck against a 6000lb 600 horse truck? Fair enough. And the displacement of 5.9 vs. 7.3 is nowhere near "about the same" I am not an engine builder either but if I wanted big power and big strength i'll be attracted to the Cummins first.
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Since when are we talking about weight?!?!?!?
And I agree that there is a difference between 5.9 and 7.3 but for this conversation its a ball park close enough.
 
going with an auto or manual trans? If you go auto expect to spend at least 25% of it on the trans. I would go with any of the Cummins engines. Big power has been made on all of them. I would go with either the 12 or Common Rail 24v. Nice thing about the CR's is you can detune it pretty easily. I do believe I read the 12v's can be fabbed up with a valet switch that cuts back some of the fuel or something of that nature.
If you go with the CR, like I said expect a minimum of 5k for a trans, another 3k for dual cp3's, $2k+ depending on single or compound turbos, $1k for some better sticks, Programming, boxes, modules $???....already over half your budget, but I bet it gets you 650+ horsepower with several thousand leftover.
 
nummit said:
Since when are we talking about weight?!?!?!?
And I agree that there is a difference between 5.9 and 7.3 but for this conversation its a ball park close enough.
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We aren't talking weight, but I am drawing a comparison of how some people whine something isn't "fair" that was the first thing that popped into my head.
 
My CR makes 764rwhp with 4800 dollars worth of aftermarket parts. This is not includung tranny. My wife drives it everyday. I have a single stage 3 cp3 and more rail pressure than I know what to do with. Driveability wise you can't beat the CR5.9.$.02
 
Just so you know, the 7.3 is pushing .9125L per cylinder and the 5.9 is pushing .983L per cylinder. The Cummins is actually pushing a little more displacement per cylinder.

On the other hand the nline six has a lot stronger bottom end and if you're talking about how much horsepower then it really doesn't matter how much each rod is holding when your crank is laying on the ground under the truck :)

George
 
12V seems to be the hot rodder of choice at this point. Just fuel and air. CR is the new champ but you will need experiance with a multimeter & computer.
The inline design of the Cummins makes it stronger. Period.
 
I Just Don't Know If I Can Bring Myself To Put A Cummins In My Truck
Insted Of A Powerstroke Hm..................................
 
It an international anyway, and ford puts the Cummins in the big trucks. In all honesty you are doing the ford a favor :)
 
Well since you have already built up the trans then you have 20k for engine/other mods? You could build one very fast, very competitive, very reliable Cummins powered Ford (something many diesel lovers envy) and still have some cash leftover for a couple of kegs after you lay the smack down..........

Snedge said:
It an international anyway, and ford puts the Cummins in the big trucks. In all honesty you are doing the ford a favor :)
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x2 LOL
 
Personally I like the CR5.9's, easy to mod, fairly cheap to get gobs of hp, super stout bottom end and tunable for everyday driving. Guys that have PSD's that have not put a 5.9 in thier truck will say its not worth it and that you can get the same power out of the 7.3 yadda yadda, but they have not had one in thier truck so they dont know.

I have a 05 cr in my 02 F350 and its one of the best mods to date that I have done.
 
Destroked is the only placefor adaptors IMHO...but realistically it's not cheap.
You're looking at around 5G for a motor...trans adaptor, flexplate, motor mounts and PCS trans controller is around another 4000-4500 bucks depending on what you get...plus mods to the motor and labor if you pay to have the swap done.
It won't be a dime cheaper than your other plan...but it can make more power and will be stronger.
 
I know a guy, he's on here...He has roughly $20k in his 7.3L now, ballpark should be upwards of 600ish rwhp...hopefully, but right now we're working on some minor problems, but they just got the motor in 2 weeks ago....FWIW
 
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