Header or Not to Header?? - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 03-16-2005, 05:12 PM
jchappy
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Header or Not to Header??

That is the Question

I can get a header for a 2.5L for about 150-160, Would it be worth it to add one or a waste of time and money on a 4 banger
And
What else to do to get alittle more out of a 2.5L
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post #2 of (permalink) Old 03-16-2005, 05:38 PM
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Re: Header or Not to Header??

I vote no header.
Use the saved money for gas to take you off road more often.
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post #3 of (permalink) Old 03-17-2005, 06:05 AM
 
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Re: Header or Not to Header??

I vote No for these reasons:

1) it's not worth it for the 4 cylinder. Leave it as is, then when it dies get a V8 (you would be surprised how cheap you can do it). I know it's hard to see it now, but trust me on this one. Do it the way you always wanted to do it the first time, or else you are just wasting your money and will regret it. If you like the 4 cylinder for whatever reason (weight) and plan to keep it, then maybe, but see next 2 points.

2) Headers are for higher RPM power, but even then it is marginal improvement (on smaller displacement engines).

3) Headers cause lots of excess underhood heat.


I originally had headers on my I-6 and went to an original exhaust manifold due to clearance issues and underhood heat. I don't regret it. I would do it over the same way again.
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post #4 of (permalink) Old 03-17-2005, 10:27 AM
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Re: Header or Not to Header??

NOT....
Headers don't provide any additional power unless you make other changes as well...cam, carb, etc. Kinda like putting wider tires on a car.....makes it look a 100 MPH faster and doesn't hardly slow it down.

As Pnut said....wait for it to die and do a SBC or Ford 5.0 conversion....
post #5 of (permalink) Old 03-17-2005, 10:56 AM
 
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Re: Header or Not to Header??

[ QUOTE ]
NOT....
Headers don't provide any additional power unless you make other changes as well...cam, carb, etc.

[/ QUOTE ]

That could be debated. It all depends on how efficient things are to begin with. Headers will provide additional power if the rest of the system works and the exhuast is inefficient. They may not deliver full potential unless you improve other parts of the system, but they can and often do make improvements by themselves.

Having said all that. I don't run them on my off-road rigs (for several reasons) and don't think I would bother on the 2.5. The factory exhuast is already pretty efficient on that engine.
Especially when compared to a 70's vintage V8 with single exhuast and log manifolds.
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post #6 of (permalink) Old 03-17-2005, 01:43 PM
jchappy
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Re: Header or Not to Header??

Thanks

I will just put my money into something else the jeep needs.
post #7 of (permalink) Old 03-17-2005, 02:47 PM
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Re: Header or Not to Header??

get a throttle body from a same year 4.0L, mine was 75$ +Shipping from a junk yard from www.car-parts.com

i got mine, not installed yet, and everyone whos done it agrees its great for power this only works on the jeeps with MPI, not early Carbed jeeps since i dont know what jeep you have

you can also go with K&N filter, and bore out the intake manifold a little to match the 4.0L throttle body as needed. when you do this you can also add a TB spacer for a lil extra.

thats the main stuff
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