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Building stroker...TPS modification question

Gil BullyKatz

NAXJA Forum User
Picking up parts for stroker project this weekend, plan on using 4.0
block,258 crank,4.0 rods,custom pistons,4.0 HO head/intake/t-
body,Renix ECU...I want to use the Renix ECU because I understand
it's easier to modify the TPS to work with the HO t-body than to re-
wire for the newer ECU...also, by keeping my Renix ('88 XJ) I retain
the knock sensor.I remember seeing a write up somewhere about
modifying the TPS so that you can use an HO throttlebody/intake/head
with a renix computer...Does anyone have/know where I can find it or
how to modify? Thanks for any input...you guys have been great

Gil
[email protected]
 
Dude...Look at the date on the post!!!!!
Stroker is almost done...
I already did my TPS mod and ported/gasket matched the intake manifold...

Project isn't done yet cuz I'm a stubborn bastard and after all the investment in the block, don't wanna go with a "stock" head
it's a 7120 head that's been ported but I'm debating going with Harland Sharps roller rockers and Manley SS valves...
It's also getting an Eaton M90 blower attached to it.

I've had to resist the urge to slap it together oem style just to tear it down shortly thereafter because the parts didn't "hold up"
I'm a big fan of the stupid pedal and it's all gotta hold up, so far this is what I got into it:
pre HO 4.0 block bored .060

258 crank

Clevite bearings

New HO 4.0 connecting rods

ARP wave-loc connecting rod bolts

Childs & Albert custom forged aluminum pistons w/23cc dish 1.392 compression ht.
+ .010 deck on a stock 4.0 block = .042 quench (factory gasket)
.930 pin dia.

Childs & Albert performance piston ring set

Camshaft: (Intake/Exhaust) 254°/262° adv. dur.,
210°/218°dur. @ .050"
lift, .477"/.493" valve lift, 1000-5200rpm, 111° lobe separation

Cloyes Tru-roller timing chain

Melling hi-volume oil pump

7120 HO head w/ major polish & porting

1994 HO intake ported/gasket matched

Flometrics 68mm throttle body


soon baby, soon
 
Looks sweet. My only concern is the Melling pump. I remember reading that a lot of the stroker guys were having premature failure on that pump. Maybe they got it fixed, maybe I've been drinking my bath water, but check out the yahoo strokers site and others. You would sure hate to invest that much in a motor to have a defective pump crater it for you.

I went with a stock pump and my oil pressure is a bit on the low side. I stayed away from the high volume Melling because of the problems others had seen. I really wanted to go HV, but didn't find an alternate source.
 
yeah...read about the Melling controversy a while back. I did my homework on the stroker's group for about 1 1/2 years before starting the project. It seemed like some guys loved them some guys hated them, but no real answers. I know there are some clearance issues with the newer engines but it seemed to be ok with my setup.

I felt safer knowing my goodies would be getting enough lubrication...

Just gotta keep my eye on the gauge.
 
If yours works, I may pick one up and swap it over the winter. I am running 16# at an idle and about 37# down the highway at the highest temps and loads. I would like to see those up about 10#, but they are within factory tolerances.
 
I'm also running a stock oil pump on my stroker but since it's almost 120*F over here, I'm using 20W-50 dino oil so it'll maintain some viscosity in this very hot weather. My oil pressures are 20-25psi at idle and 40-45psi on the highway when the oil's hot (above 180*F on my oil temp. gauge). That's fine for me. I'm going to convert to Mobil 1 when I reach the 5000 mile mark.
I steered away from the Melling pump for three reasons; the high failure rate, concerns about clearance from the oil pan, and the Melling oil pump shaft is thinner and not as strong as the stock pump's (that may explain the higher failure rate).

1992 XJ Laredo 4-dr - 4.6L I6 HO Stroker - 175k miles - AX15, NP231, D35c, D30
Estimated 261hp/322lbft, best 1/4 mile [email protected] before stroker install
Websites - Jeep 4.0 Performance, 4.6L Stroker Build-Up, Dino's Jeep Tricks
 
Re: Building stroker...Melling pump

I have 17K on my stroker with Melling High volume pump. I run 40# hot with 5W -30 Synthetic. It never goes below 35 lbs even when idling warm.
You do have to dent (properly clearance) the oil pan for the deeper pump.
Pressure depends more on clearances than the pump - my 4.0 drag motor with stock aluminum 99 oil pump shows 50 lbs when cold - drops off some when warmer.
 
Re: Building stroker...Melling pump

rsalemi said:
I have 17K on my stroker with Melling High volume pump. I run 40# hot with 5W -30 Synthetic. It never goes below 35 lbs even when idling warm.
You do have to dent (properly clearance) the oil pan for the deeper pump.
Pressure depends more on clearances than the pump - my 4.0 drag motor with stock aluminum 99 oil pump shows 50 lbs when cold - drops off some when warmer.

Nice to hear from someone actually running it ;)
 
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