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Old 05-11-2010, 12:35 PM
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Aluminum 4.0L Cylinder Heads

Has anybody put these on I know its a bad economy and crap but these look nice. But 30HP for 2 grand is a lot!!!

http://www.hesco.us/shop.asp?action=...115&catId=7735
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Old 05-11-2010, 12:47 PM
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Re: Aluminum 4.0L Cylinder Heads

seems like a lot for not much IDK.
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Old 05-11-2010, 01:47 PM
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Re: Aluminum 4.0L Cylinder Heads

It is alot, but you have to consider that it's a brand new casting.

Someone bought it and only made about 20-25 hp, even with tuning.
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Old 05-15-2010, 06:31 PM
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Re: Aluminum 4.0L Cylinder Heads

I am in the process of beefing up my 4.0 in my 04WJ but if you are looking to make big power numbers the best way historicaly is cubes. Get a bigger motor. From what I understand it seems there are a few turbo and supercharger setups out there for the 4.7 V8. I agree with everyone else. That is way out of whack for the CLAIMED HP gains. It works out to be about $67 a HP...that is pretty steep. I bet you could find a 4.7.

http://www.car-part.com

After a quick search I could buy a 4.7V8 HO for just about $2k...intersting...So you now get a motor that jeep/dodge claims makes these numbers:

Engine Power (SAE net): 265-270 BHP @ 5100 RPM
Engine Torque (SAE net): 325-330 LB-FT @ 3600 RPM

Niw your 4.0 makes what a claimed 195 horsepower, 230 lb.-ft. of torque. Now by my calculations you just spent about $29 a horse....much much more reasonable. You also gained about 70hp and about 95ish lb/ft of torque. Thats a pretty significant gain for a fair price per horse.

If you have $2k plus sitting around maybe this is the better route to go.

'Mike
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Old 05-15-2010, 08:57 PM
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Re: Aluminum 4.0L Cylinder Heads

Quote:
Originally Posted by Ironman7 View Post
I am in the process of beefing up my 4.0 in my 04WJ but if you are looking to make big power numbers the best way historicaly is cubes. Get a bigger motor. From what I understand it seems there are a few turbo and supercharger setups out there for the 4.7 V8. I agree with everyone else. That is way out of whack for the CLAIMED HP gains. It works out to be about $67 a HP...that is pretty steep. I bet you could find a 4.7.

http://www.car-part.com

After a quick search I could buy a 4.7V8 HO for just about $2k...intersting...So you now get a motor that jeep/dodge claims makes these numbers:

Engine Power (SAE net): 265-270 BHP @ 5100 RPM
Engine Torque (SAE net): 325-330 LB-FT @ 3600 RPM

Niw your 4.0 makes what a claimed 195 horsepower, 230 lb.-ft. of torque. Now by my calculations you just spent about $29 a horse....much much more reasonable. You also gained about 70hp and about 95ish lb/ft of torque. Thats a pretty significant gain for a fair price per horse.

If you have $2k plus sitting around maybe this is the better route to go.

'Mike
Well first I need 2000 in extra cash to throw away but they do look nice its probaly cheaper (and simplier)selling and going to a 4.7 H.O. or a stroker.
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Old 05-19-2010, 05:51 PM
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Re: Aluminum 4.0L Cylinder Heads

It seems to me that there are a ton of aftermarket speed parts including superchargers and turbo kits for the 4.7 in any form than what is available for the 4.0 I6. It also seems its easier to mod the 4.7 than the HEMI but I may be wrong.

If you did an engine swap it would be more than the $2k i said. A gross over simplification to prove a point. At the very least you would need the computer in addition to the motor. More than likely you would also need the tranny for it as well and some other odds and ends. All said and done I would imagine swapping a 4.7 in would be somewhere around $3300-3800 When all is said and done. But still that sounds like the far more reliable option with much more potential to build power than heavily modding the 4.0

'Mike
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Old 05-19-2010, 06:25 PM
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Re: Aluminum 4.0L Cylinder Heads

Quote:
Originally Posted by Ironman7 View Post
It seems to me that there are a ton of aftermarket speed parts including superchargers and turbo kits for the 4.7 in any form than what is available for the 4.0 I6. It also seems its easier to mod the 4.7 than the HEMI but I may be wrong.

If you did an engine swap it would be more than the $2k i said. A gross over simplification to prove a point. At the very least you would need the computer in addition to the motor. More than likely you would also need the tranny for it as well and some other odds and ends. All said and done I would imagine swapping a 4.7 in would be somewhere around $3300-3800 When all is said and done. But still that sounds like the far more reliable option with much more potential to build power than heavily modding the 4.0

'Mike
The problem is you'd spend all that money to still just have a 15 sec 1/4 truck.
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Old 05-22-2010, 12:20 PM
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Re: Aluminum 4.0L Cylinder Heads

Oh I agree Ryan. But you would spend far more modding a 4.0 to 15 second 1/4 glory than modding a 4.7 in any form. At the end of the day the thing is a jeep and was never intended to burn up the street or the strip. Now the SRT8 GCs...thats another story.

I think if I were going to try to have a sub 13 second street car/truck it would be a totaly custom build. I would find a body that was solid and drop in either a monster fuel injected crate motor or some kind of turbo motor. I always wanted to put a turbo 3.8 V6 into an S-10 kind of vehicle. Lucky for me the nations authority on those buick turbo 3.8s(you know the ones form the T-type, GNX etc... from the 80s) is about a 10 minute walk up the road from me.
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