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Street and Performance A forum to discuss modifications related to street XJs and performance tweaking.

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  #1  
Old December 9th, 2008, 15:41
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Talyn Talyn is offline
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4.6L stroker in the works

I've had this posted on JeepStrokers.com for a while so I figured I would post this here.

I'm working on a new 4.6L stroker to replace that Titan stroker I have.

Basically, I am using .030" over KB944 forged pistons 4.0L rods, a 2000 block, comp cam 68-231-4. Harland Sharp roller rockers, 25lb injectors, 63mm throttle body, 2000 Turbo X coated Doug Thorley header, and a ported and polished head. I'm shooting for 9.58 static compression ration, 8.19 dynamic compression ratio and a .044" quench. I'm going to try to pull off running regular gas.

Main bearings - Clevite 77 TM - Ms1947P
Cam bearings - Clevite 77 - SH1980S
Rod bearings - Clevite - CB960P x6
Oil pump - Melling - mel-M81A
Freeze plugs - Pioneer - PE-256-BR
Rod bolts - ARP - 112-6001
Pistons - KB - KB 944
Crank spacer - Hesco
Timing set - JP performance Billet - JP5629
Crank - 4 counter weight 4.2L
Rods - 4.0L rods, polished and cryo tempered
Cam - Comp Cam - 68-231-4 - Comp cam
Lifters - comp-cam
Mopar Performance .041" MLS head gasket.

I had to modify the rod bearing because they orginally didn't have any occomidation for the oil squirt hole in the rods.





Polished rods:


]img]http://jeep.blackonyx.net/forum/kb94446l/P1200314.JPG[/img]

The next pics are of the JP Performance timing set (on the right) compared to some single timing chain set. The JP set is a thing of beauty compared to the other one. One thing that is interesting is the number of teeth compared to the old one. The JP timing set has may more.. no, I am not counting them. Has anyone remived the tensioning block and removed it's brackets from the cover? Some where I heard that this is necessary on a double rolled set, but I don't remember where I picked that up.





Pistons:




I'm going to groove the lifter bores to push more oil to the cam lobes as well. Lifter bore grooving tool:
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  #2  
Old December 9th, 2008, 15:52
urban yan urban yan is offline
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Re: 4.6L stroker in the works

I don't fully understand it, but my golly do I ever want it !!!

Last edited by JeepFreak21; January 6th, 2009 at 16:19. Reason: f-bomb
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  #3  
Old December 9th, 2008, 16:33
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wolfpackjeeper wolfpackjeeper is offline
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Re: 4.6L stroker in the works

nice. I want to do a lot of this on my second stroker. I want one for my MJ. The one I built for the cherokee works great, but a lot of stuff was used because I could get it right the hell now. Used a new timing chain, but not a double. Used off the shelf .060 over pistons. Reused the HO cam, that kind of thing. When I do it again for the MJ it will be built with a boost-laden future in mind. I want the Street MJ to be able to leave in one big hurry.
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Old December 9th, 2008, 20:22
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seanyb505 seanyb505 is offline
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Re: 4.6L stroker in the works

I didnt know you went by Talyn over here. needs to see this stuff too though. Good job


Quote:
Originally Posted by urban yan View Post
I don't fully understand it, but my golly do I ever want it !!!
Its easy once you get into it. Maybe its a thing

Last edited by JeepFreak21; January 6th, 2009 at 16:19.
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  #5  
Old December 10th, 2008, 19:26
bigdaddyjlove bigdaddyjlove is offline
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Re: 4.6L stroker in the works

Damn, when I built mine, I searched all over the inter-tubes for a double roller timing set. Where did you get that one?
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  #6  
Old December 11th, 2008, 04:26
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Talyn Talyn is offline
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Re: 4.6L stroker in the works

Falcon. There is the JP one.. Rollermaster one and Cloyes. The CLoyes should have been easy to find. JP and Rollermaster are billet.
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Old December 12th, 2008, 12:04
JJacobs JJacobs is offline
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Re: 4.6L stroker in the works

Looks nice! Just FYI though the rod bearing notches are unnecessary.
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Old December 12th, 2008, 12:44
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Talyn Talyn is offline
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Re: 4.6L stroker in the works

Why so? Is there another oil path that the oil takes to get out the rod squirt hole?
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Old December 12th, 2008, 12:57
JJacobs JJacobs is offline
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Re: 4.6L stroker in the works

Yes. Out the sides of the rod bearing, which is then splashed onto the cylinder walls. I went through the same thing with my 401, the replacement rod bearings had no grooves and I thought they were critical to piston oiling. Consulted a few machine shops then installed them as is. No problems. Looks like you have it dealt with now anyway.
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  #10  
Old December 12th, 2008, 14:06
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Talyn Talyn is offline
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Re: 4.6L stroker in the works

My thinking was along the lines of they were there from the factory.. maybe they are needed.. maybe they aren't... I don't see how doing so would damage the bearing, so lets break out the dremel.
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  #11  
Old December 12th, 2008, 14:25
igotanxj igotanxj is offline
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Re: 4.6L stroker in the works

looks nice. What crank you using? Just a stock 258?
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  #12  
Old December 12th, 2008, 15:10
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Talyn Talyn is offline
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Re: 4.6L stroker in the works

yeah, only thing one can really use for a stroker.
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  #13  
Old December 12th, 2008, 16:32
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Re: 4.6L stroker in the works

This is the head going on top of the block: http://www.naxja.org/forum/showthread.php?t=953786
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  #14  
Old December 18th, 2008, 16:18
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Re: 4.6L stroker in the works

The rods are back from being cryo tempered, and all the engine parts are at the machine shop. My exhaust manifold is off for Turbo X 2000 coating.
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  #15  
Old January 10th, 2009, 17:25
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Re: 4.6L stroker in the works

Not a whole lot of action on this. The parts are at the machine shop.. and its was bear season.. and apparently the machinist is a big bear hunter... I knew it would take them a while but they do good work. Other than that I went to my storage unit to arrange things some and organize the parts. Also, I ordered a 136 amp alternator to swap in now. Since I need to grind the alternator mount and engine block to get it to fit I thought it would be easier to do that with the engine out of the bay. I am also working on some custom sill plates made from aluminum on the router.

I did receive my header back Thermal Tech Coatings, http://www.thermaltechcoatings.com/. I had it coated in their Turbo X 2000 coating which is good for 2000 degrees. Similar to Jet hot.




Also, I did a little custom touch on my oil pan


And there is where my Jeep currently sits... my garage away from my garage.. its a storage unit
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