What's the most HP for a 4.0?

[diz rocks]

What's the most horsepower anyone has ever gotten out of an inline six jeep engine? Not going to race my Cherokee on Pinks or anything, just wondering.

 

[MudDawg]

I know of one that is supercharged with nitrous in the 500 hp range.

 

[seanyb505]

Wasnt there something about a 4.7 that Hesco built with 6 7 hundred hp on here a while back? I know its not a 4.0, but its the same block

 

[JohnX]

Mine is 475 at the wheels on the bottle and 12 lbs of boost.

 

[OCMI_Teddy]

where you getting that 12 lbs boost from?

 

[JohnX]

Farting in a bottle.


Just a joke...hence the wink.

 

[DeftwillP]

a millionandy HP


it's all about the champion truck plugs

 

[5-90]

"Speed is a question of money. How fast can you afford to go?"

I know it's not generally polite to answer a question with a question, but there are times when it has to be done. What are you trying to do? Asking an open-ended "how much power" isn't going to get you a useful answer from anyone - even if they've trod that ground before.

There are times when you have to part with information to get more. This is one of them.

 

[DeftwillP]

OK, I was just playing around. Jon is serious, and very true.

I mean...look at his post count. What a weirdo....jk

 

[5-90]

OK, I was just playing around. Jon is serious, and very true.

I mean...look at his post count. What a weirdo....jk

Of course I'm serious (and I've been around here long enough to be considered a "fixture," I'm sure...)

Ever heard of Barney Navarro? Powered an Indy car with an AMC six...

 

[JohnX]

Actually Jon is exactly right. Having drag raced for many years...the only thing that makes power is money. The straight six is a good design and I think would have no trouble cranking out 1000 ponies. But the question is simple...can you afford a custom forged crank? Custom Pistons? Custom induction work? A custom girdle for the block? Costom rods? Custom Head? Nitromethane at $1200 a barrel?

It truley does come down to money...notice how many backyard wrenches without sponsors there are in the NHRA Top Fuel class?

 

[Dr. Dyno]

What's the most horsepower anyone has ever gotten out of an inline six jeep engine? Not going to race my Cherokee on Pinks or anything, just wondering.

I'm not sure why you're asking this question but if you want to start increasing the HP output from your own 4.0, you need to start looking around my site:

http://www.jeep4.0performance.4mg.com/index.html

 

[NXJ]

In order to make this thread a tad more valid - how about rephrasing a little-bitty, and raise the following question:

How much torque/power can a blueprinted and utmost built/tuned AMC 242 feasibly produce in a reliable manner, fuelled on standard pump gas?

 

[JohnX]

In order to make this thread a tad more valid - how about rephrasing a little-bitty, and raise the following question:

How much torque/power can a blueprinted and utmost built/tuned AMC 242 feasibly produce in a reliable manner, fuelled on standard pump gas?

Define reliable?

Does that mean it doesn't break down? It will make it 50K miles? 100K? 200K?

Problem is, that any "performance" motor is not as reliable as the stockers are. Displacement being equal, then the only way to get more power is to get more air/fuel into the system. More power ultimately leads to more wear and less "reliability".

 

[OCMI_Teddy]

How about 100k

 

[JohnX]

Yeah....I'd like a 100k

 

[BBeach]

Id be fine with 30k, im pretty sure by then id want to put something newer and better in.

 

[OCMI_Teddy]

Yeah....I'd like a 100k

lol wouldn't we all :compwork:

 

[Dr. Dyno]

Problem is, that any "performance" motor is not as reliable as the stockers are.

Not necessarily. If you throw on a bunch of external bolt-on mods, port the head and raise the CR slightly to improve efficiency, and chip tune to optimize the fuel/timing curves, you can have a factory stock reliable motor that puts out a lot more power than stock.
_________________________
1992 XJ Laredo - 4.6L Stroker - 5-speed manual
Dyno - 198hp@4650rpm, 254lbft@3550rpm (wheels) = 245hp@4800rpm, 306lbft@3550rpm (crank)
Performance - 0-60 = 6.2, 1/4 mile = [email protected] in full street trim
Sites - Jeep 4.0 Performance, 4.6L Stroker Build-Up, Dino's Jeep Tricks

 

[Pro Stock John]

I'd say NA probably 400 hp, and with a power adder the skys the limit but I'm sure someone has made 700 hp with nitrous, turbo or a blower, or a combination of two of those.