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Jeep Street and Performance Do you like to go fast in your Jeep?

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  #1  
Old July 26th, 2012, 22:28
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alex22 alex22 is offline
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Performance 4.0 build

So I picked up another XJ a month or so ago that needed a new head, its an 01 and the head was not repairable. I had planed on just doing a quick head swap, but the more I looked the less I liked so out came the engine. The cam was starting to wear, rings were shot, expansion plugs were almost rotted through, pistons were scuffed badly and the timing chain was slopped out. The crankshaft main journals were at minimum spec, main housing bores were at maximum and the factory put in a half set of .001 under bearings. But other than that it was great...

New parts and labor:
Clean and magnaflux.
Block was align honed to minimum spec so I can use STD bearings without Excessive oil clearances.
Balanced rotating XXXembly.
ARP rod bolts.
.020 over Speed Pro pistons
Block decked to bring the pistons to about .005 in the hole for 9:1 compression and tighten the squish.
Comp Cams 68-232-4
Pre 1997 timing set and bolt with spring loaded pin.
Mopar performance valve springs & retainers
New head casting with some porting and chamber cleanup and performance valve job.
Ebay SS header and high flow precats.
Magnaflow high flow cat and Dynomax catback
AFE intake.
4 hole injectors.

Will moving the IAT sensor into the intake tube/airbox or an adjustable MAP be enough to keep the A/F ratio correct with the breathing mods?

Will 19lb injectors be enough for this?

Can the Mopar Performance valve springs and hardened locks be used with the late style 3 groove keepers or do I have to get the older style valves and use single groove hardened keepers?

~Alex
no, this will not become a stroker.
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  #2  
Old July 27th, 2012, 05:53
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Talyn Talyn is offline
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Re: Performance 4.0 build

You still have a 4.0L displacement. The injection system will not need to be modified. The 2000 doesn't have 19lb injectors, but 22.5lbs. You need the older style valves to use the MP locks. I would also do a 30* back cut on the intake valves. I would also recommend using a solid pin on the cam instead of the pin and spring setup. If you have the time you could polish the rods and clean up the crank a bit.
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  #3  
Old July 27th, 2012, 06:59
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Re: Performance 4.0 build

Thanks for the correction on the injector rate. Now that I need to get new valves in order to run the Mopar spring package I'm going to look around the shop for a set of LS valves.
I balanced the crankshaft within race spec the other night (it was only off a few grams to start with.) The oil holes are going to get chamfered, rods and mains are going to be polished. I'm not going to worry about the rough casting of the crank though. Polishing and shot peening the connecting rod beams won't take too long and I haven't resized them yet so its not too late.

~Alex
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  #4  
Old July 27th, 2012, 07:58
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Talyn Talyn is offline
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Re: Performance 4.0 build

If you are going with LS valves it may be cheaper just to do the whole valve and spring setup based on them vs. Mopar Performance springs. You may be able to run stock 3 bead locks with the MP retainers. IIRC they are the same degree, but I don't remember 100%. I doubt smoothing out the crank will help performance at this level (or rather any 4.xL build for that matter), but it will make oil shedding easier. You are balancing the rods and pistons as well, correct?
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  #5  
Old July 27th, 2012, 11:23
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Re: Performance 4.0 build

The piston and pin assemblies came out of the box at -0 to +1 gram of eachother. I'm going to match the weight of the big and small ends. The 3 bead and the single bead locks are both 8*. 3 bead locks aren't the best for RPMs but would probably work on this cams power band (800 to 4800.) I'll have to do a test fit with LS valves and springs on a junk head. As much as I dont want to do another valve job it wouldn't be so bad since the parts will be free.

~Alex
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  #6  
Old July 27th, 2012, 17:39
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Re: Performance 4.0 build

Quote:
Originally Posted by alex22 View Post
3 bead locks aren't the best for RPMs but would probably work on this cams power band (800 to 4800.)
Lol. Its not like you can spin these engines much over 5500 rpm.
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  #7  
Old September 1st, 2012, 22:21
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Re: Performance 4.0 build

I finished up an engine for my cousin a few weeks ago so its back onto my own.

My cousin's:
Dart block, Eagle 427 stroker crank and rods, Mahle pistons, ported heads with dual 450 carbs, solid flat tappet and 10.3:1 compression. 537 Hp @ 5500 and 548 ft*lbs @ 4600.



My 4.0 so far:
0331 head, the top of the head was not cracked between #3 and #4, but...


Replacement head from ATD Diesel, new casting.



Gave it a performance valve job.


Intakes and exhausts cut.


Always check concintricity.


Placement of the seat to the valve. The intakes were backcut to 34* and 19* and the exhaust valves to 30* (forgot the pics of those.)



The ports and chambers were a bit rough and I spent a few hours with the die grinder. I flowed it and compared it to a factory 0331 head with only 7000 miles on it which came through the shop a few years ago. I flowed that one on my own time just to see how it was. This head now flows about 10 CFM better than the factory head.



Head on the bench, I forgot to print out a report though.



Now onto the block....

After a quick hone I did a test fit with all of the pistons to determine how much to deck it. Now on the resurfacer, I took about .025 off the block to put the pistons between .010 and .005 in the hole. I had to cut .005 off of the deck just to clean it up, the shiny parts in this pic are the areas that the cutter hit first.



All finished up in the hone.



And how it sits as of now. Rods maged, ARP rod bolts, resized, weight matched and balanced, checked for straightness, hung the new pistons, checked piston ring end gap, align honed, clearances checked final cleaned and painted.



Its almost too pretty to put back into the XJ



And now that I'm back in school Its going to be slow going for this 4.0

~Alex
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  #8  
Old September 2nd, 2012, 08:47
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Re: Performance 4.0 build

Quote:
Originally Posted by alex22 View Post
Its almost too pretty to put back into the XJ

Wow. Sexy!
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  #9  
Old October 14th, 2012, 20:38
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Re: Performance 4.0 build

Springs and retainers are here.
Comp Cams 26125 springs meant for a 4.6 mustang
Comp cams 761 retainers meant for a 5.7 Hemi
Factory 3 groove keepers
Manley spring seat cutter: 41824
Thanks to Talyn and Lafrad for the combo.

Install Height with this setup is 0.060 tighter than using the factory Jeep retainer. I didn't check spring force on the spring on the seat or full lift yet.

Spring seat cutter in action.


Before, during and after in the VGS-20


Resurfaced the manifold surface.


Cut 0.008 off of the deck of the head.
\

~Alex
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  #10  
Old February 23rd, 2013, 13:13
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Re: Performance 4.0 build

Its all together now, smoke checked, primed and the cam sensor has been clocked.

I'm bringing this thing home this weekend. Its going to need some new injectors, the ones I took out didn't look too good and were the single hole design. I was keeping up with the "Precision Injector" thread from the supplier on eBay but I can't remember what the final verdict on that seller's quality was. Does anybody have an update for me or another source for the multi hole injecots?

~Alex
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  #11  
Old February 24th, 2013, 00:31
srmitchell srmitchell is offline
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Re: Performance 4.0 build

I'm running the green 4 hole precision injectors. (For my 01.) I had a leak down issue, but they sent me a new set, and they work awesome now. Holy crap, great work.

Is this kind of work really hard? Im not a machinist, I'm great at working on my jeep, but engine stuff is like voodoo magic to me.

You mentioned highflow precats, and maybe a new exhaust manifold? I'd like to know what you did, I'm looking for power options for my 2001.
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  #12  
Old February 24th, 2013, 05:46
CobraMarty CobraMarty is offline
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Re: Performance 4.0 build

Can you post your head flow chart? What size valves?

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  #13  
Old February 24th, 2013, 07:16
Veeb0rg Veeb0rg is offline
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Re: Performance 4.0 build

Must be nice to have the shop/tools and know-how to do this. Consider me Jealous.
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  #14  
Old February 24th, 2013, 10:23
D.I.T.A D.I.T.A is offline
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Re: Performance 4.0 build

Wow this sounds spot on to the build im about to do. Definatly keeping my eye on this thread. great work so far !
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  #15  
Old February 24th, 2013, 18:37
cdrake261 cdrake261 is offline
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Re: Performance 4.0 build

Quote:
Originally Posted by srmitchell View Post
Is this kind of work really hard? Im not a machinist, I'm great at working on my jeep, but engine stuff is like voodoo magic to me.
I also want to know...I have a 4.0L I want to rebuild and put into my jeep
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