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

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  #76  
Old August 23rd, 2013, 17:09
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alex22 alex22 is offline
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Re: Performance 4.0 build

Quote:
Originally Posted by O-Gauge Steamer View Post
Well, actually...

Per the FSM, hot idle oil pressure anything above 12psi is acceptable. It is one of the things that I find unnerving about the 4.0 as everything else I have ever owned idled at at least twice that. My off idle pressure is around the 40 pound mark which is also, IMO, acceptable.

All of which makes me wonder how a 30psi hot idle is achieved. Really makes me wonder that does.
I'll take a look at my blueprint sheet and post up oil clearances over the weekend.

Some bearing clearance high/low limits can be a bit frightening as well.

~Alex
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  #77  
Old August 23rd, 2013, 21:47
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GrimmJeeper GrimmJeeper is offline
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Re: Performance 4.0 build

decided to pay attention to the gauge today after reading this thread in the morning, I'm pulling ~14 psi hot idle and 40-50 at cruising speed.

stock 2000 87,000 mile 4.0 /aw4.
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  #78  
Old August 23rd, 2013, 22:18
Alexia Alexia is offline
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Re: Performance 4.0 build

30 PSI at hot engine idle here on a freshly rebuilt engine.
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  #79  
Old August 24th, 2013, 05:20
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Dr. Dyno Dr. Dyno is offline
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Re: Performance 4.0 build

Hot idle on my 72k mile old stroker is around 25psi, 40+psi at 1500rpm, and 50+psi at 2000+rpm. That's with 10W-40 grade semi-synthetic.
The oil pressure hasn't changed since the engine was new.
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  #80  
Old August 26th, 2013, 22:36
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alex22 alex22 is offline
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Re: Performance 4.0 build

Oil clearances

Mains.
1: .0026
2: .0028
3: .0026
4: .0026
5: .0028
6: .0027
7: .0029

Rods.
1: .0022
2: .0025
3: .0025
4: .0026
5: .0023
6: .0023

A small hole in the front pipe plug for timing chain oiling .022 IIRC.

After a long highway trip with a few miles it will actually dip to about 25psi at idle.

~Alex
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  #81  
Old December 2nd, 2014, 15:21
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alex22 alex22 is offline
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Re: Performance 4.0 build

The first one of these ended up being sold to a guy in Virginia, haven't heard any other feedback on the build.


The next one will be going into my 96 5 speed in a month or so; its basically a carbon copy of this one but the intakes flow about 250 cfm at 28" and it will be using fuel injectors by Marren fuel injection.
My friend (rmx250cfl on ) is finishing this one up for me.




I'll probably end up painting the valve cover gloss black along with the pan. Accessory brackets and timing cover will be aluminum finish.

-Alex
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  #82  
Old December 2nd, 2014, 16:27
Talyn Talyn is offline
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Re: Performance 4.0 build

Quote:
Originally Posted by alex22 View Post
it will be using fuel injectors by Marren fuel injection.
Any thing special about these injectors?
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  #83  
Old December 2nd, 2014, 20:58
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alex22 alex22 is offline
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Re: Performance 4.0 build

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Originally Posted by Talyn View Post
Any thing special about these injectors?
I forgot the part number or flow rate but when Tim was asked about running the usual Neon (or other commonly used injector for the 4.0) he carried on for about 10 minutes about why those were not the correct injector for this engine. That, and my friend bought them for his XJ originally but he ordered the old style plug... so I have em now.

If you're not familiar with the company here is their company info.
http://www.injector.com/

Edit: These are four pintle injectors.

-Alex
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