HP/TQ gains?

[ftpiercecracker1]

So are you saying that all inline six heads are swapable, BUT to use a 99 and up intake you have to use a 91 and up head???

Also could you be more specific on the items i need to get with the intake?

fuel rail?
TB?
Throttle cable and linkage?

I need clear and consice answers or else i get confused and waste all of our time. thanks for your patience

I will be checking on you build thread.

[Cheromaniac]

Ok ladies and gentlemen, there are several things i need made CRYSTAL clear.


I just spent the last 2 hrs pussyfooting around with a local salvage yard owner who didnt hardly speak english (Arab), but gaurnteed me that a 99 intake would NOT bolt onto a 95 7120 head, all based on what his pos computer said, repeat WOULD NOT. And he also gave me a really hard time saying there was ZERO difference between 7120 and 0630 heads.

So after about 1.5hrs of pointless arguing and another 1.5hrs of working in the blazing sun only to determine it was the wrong head i drove away emty handed and a little miffed. Purely my fault, should have asked more questions and done more research. Soo that being said. . .

1. What year heads will swap with what year manifolds???
91 with 99? 98 with 01? Will a 99 head still bolt to my 90 block???

2. Does it matter what vehicle it comes off of, found out today that GRAND cherokees came with the 4.0 all the way up to 01, maybe even newer.

3. What about all the vacuum hoses, sensors, TB, Throttle linkage, injectors, fuel rail, t-stat housing?
Will my renix equipment be PnP?

sorry for such a long post.

1. I guarantee you that a '99+ intake manifold WILL bolt onto a 7120 head (I'm living proof) and indeed any 4.0 HO head. It'll also bolt onto a Renix head but you'd need to slot the manifold dowel pin holes to align the intake runners with the ports properly.

2. A 4.0 head from any year ('87-'06) will bolt onto a Renix 4.0 block.

3. The only difference between the 7120 and 0630 heads is that the 7120 has a threaded hole for the coolant temp. gauge sending unit near the back on the driver's side.

4. The two-piece exhaust manifold from '00+ TJs/XJs and '99+ WJs will only fit properly on the 0331 head. The one-piece '91-'99 exhaust manifold with a single outlet will fit on the 7120 and 0630 heads.

5. It doesn't matter which Jeep 4.0L vehicle the head comes from.

6. Since you have a Renix XJ and a '90 block, I suggest you add the following:

a) 7120 or 0630 head. Doesn't matter which vehicle it comes from.
b) '99+ intake manifold. Doesn't matter which vehicle it comes from.
c) '91-'95 HO throttle body. A '96+ TB is also OK but you'll need to block off the MAP sensor vacuum port. Doesn't matter which vehicle it comes from.
d) Reuse your existing Renix IAC valve, and modify the Renix TPS to fit on the HO TB (or buy Hesco's adapter).
e) '91-'95 fuel rail with regulator and fuel lines.
f) '91-'95 XJ throttle cable/bracket.
g) '91-'99 exhaust manifold. Doesn't matter which vehicle it comes from.
h) Ford 24lb injectors.

You'll need to reuse all your existing Renix sensors with the Renix computer. Vacuum lines to the intake manifold/fuel pressure regulator may need to be adapted/rerouted, and the wiring to the IAT sensor in the intake manifold may need to be extended. It's all fairly easy to do though.

[ftpiercecracker1]

Now thats more like it! Thanks for such a clear and thorough post, I think I just might be able to pull this off now.

Thanks a bunch
and its actually an MJ not an XJ, but no worries

[superj]

or, jeff leigh, from www.strokedjeep.com can do your boring of your throttle body. he did my renix throttle body and it came out badass. i ended up not upgrading gears because the bored throttle body made such an improvement on the remix engine. jeff does great work and is a jeep guy himself

[ftpiercecracker1]

i've had a shotcut to his website on my desktop for about 2 months , i 100% plan to get my TB done by him, just havent gotten around to it yet.

and before i forget I know you guys already said 99 and up for the intake, but i have found a 98 for uber cheap, like $22. How big a difference is there between the two?

[amcinstaller]

98 probably isnt the squid style one. 99 is the change and the more desireable, and the older ones are a log style

[ftpiercecracker1]

squid? log? are talking about EXHAUST manifold?

[Cheromaniac]

i've had a shotcut to his website on my desktop for about 2 months , i 100% plan to get my TB done by him, just havent gotten around to it yet.

and before i forget I know you guys already said 99 and up for the intake, but i have found a 98 for uber cheap, like $22. How big a difference is there between the two?

A '98 or earlier intake manifold will look like the one on the left. The more desirable '99+ intake manifold is the one on the right.

[W_A_Watson_II]

How does the '99+ intake manifold effect throttle and kick-down cable's? Looks like the TB is closer to the engine.

[SilverXJ]

No problem with the throttle/kickdown/tv cables.

[ftpiercecracker1]

thanks for the pic that really helps and i think i might have found one

i might have already put this up here but i dont remember, so i'll tell my tale again, short version

Spent about a month researching, calling, and driving all over creation to find the best prices for said parts. end result about $325 for just the head and intake , BUT after taking a short trip to a place called "express pull 'n' save" i have found heaven on earth. Long story short i can get EVERYTHING for the engine plus some crap i would just like to have all for an incredible $83.95 . If there was a rating system for salvage yards this one would definately be a 5 star. HUGE lot, all gravel, practically manicured landscape, all the vehicles are on blocks up about ft and half off the ground, super SUPER nice place. anyway thats my story, and i will probably never go to any other yards ever again.

[ftpiercecracker1]

Alrighty then! After 5hrs of busten my a** and a little help from a friend i was able to geat a pretty good start on my list, heres the list, tell me what you think. .

96 7120 head (praying its not cracked)
94 HO TB, Fuel rail, Fuel lines, Exhaust man, Throttle bracket and cable

They didnt have the intake i needed, but they get shipments of vehicles in every week, so i will be checking in. Is there anything i missed?

a couple of questions.

1. How will i get the new fuel lines to adapt to the Renix lines? I got the lines full length all the way down to the frame rail. Flanger?

2. If the TB is bored out wont the intake also need to be bored to match?

3. Renix exhaust man uses 1 bolt, 94 uses 6. What to do?
EDIT: Oh wait, I forgot that I'm an idiot . Since i'm using the 94 head, the 94 exhuast man (both came from same vehicle) will work splendidly!

[Cheromaniac]

1. How will i get the new fuel lines to adapt to the Renix lines? I got the lines full length all the way down to the frame rail. Flanger?

The '94 injector rail and fuel lines that you have should be plug n' play.

2. If the TB is bored out wont the intake also need to be bored to match?

The intake already has a 62mm opening.

[ftpiercecracker1]

sweeeet.

The last thing to get for the engine is that elusive intake

Question: Will all the Renix brackets still work, I've heard people having trouble getting the older PS resivour to bolt up to the newer components, not exactly sure where the problem lies though.

Also just a little thing, ordered my 64mm TB from "Leigh Performance Machine" should hopefully be in friday.

[Cheromaniac]

Question: Will all the Renix brackets still work, I've heard people having trouble getting the older PS resivour to bolt up to the newer components, not exactly sure where the problem lies though.

The older PS pump mounting bracket won't fit on the '99+ intake. You'll either need to modify the bracket (a PITA) or buy a pump from a '97+ XJ.