Outer Limits 4x4 Board

Sometimes a failing engine will seize from heat caused by lack of lubrication. The parts grow in dimension until there is no clearance available for rotation. This often happens when pistons seize - the engine won't restart, but after it cools down, there is enough clearance for it to rotate and ...

6G72 SOHC 12v with 8.9:1 CR is non-interference. 6G72 SOHC 12v with 10:1 CR and all DOHC and/or 24v variants are interference design.

Frank

Have your radiator rodded, check/replace the thermostat and fan clutch.

Frank

I haven't looked at my transmission pan in a while - you might have to remove the mount and jack the transmission from the rear to gain clearance.

It's a good habit to drain fluids after a fresh startup to flush engine crud that might have been loosened and/or missed during the rebuild.

Frank

1. Do I need to bleed the oil cooler at the top banjo joint (there is zero oil left in it) when i start the motor up?


No.

2. Do i need to bleed the auto cooler after startup?

No.

3. What is the best way to determine if oil supply is sufficient after cranking the motor for some time on the ...

The OE bolts on my '89 were M12 x 50mm 10T. I replaced them with M12 1.25 x 60mm in order to accomodate extra shims and the longer nylock nuts.

Frank

I replaced all of mine with grade 10.9 and nylock nuts. If you can find the fine thread, be sure to use them. I have a bag of extras, but shipping from the States might be a bit rich. Let me know if you need it that badly.

Frank

they say the stock cams are 182, lift 0.394. The RPW stage 1 cams are 258 with 0.360 lift.

Their information is wrong. Here are the Gen1 3.0L cam specs:


Intake open = 19°BTDC
Intake close = 59°ABDC

Exhaust open = 59°BBDC
Exhaust close = 19°ATDC

Intake Duration = 258°
Exhaust Duration = 258 ...

Got hold of RPW, they recommend the following: Stage 1 cams, rebored throttle body and plenium, free flow exhaust, extractors and a piggyback ecu. Anyone done the same? Does it make an improvement?


Of course they recommend those things - that's what they sell. :lol:

The cams probably increase ...

My Gen1 SWB 3.0L A/T with a fresh engine returns 20mpg or ~12L/1100km. In order to get that level of mileage performance, it's necessary to keep speed at 65mph or 105km/hr since the Gen1 has the aerodynamics of a refrigerator.

If you have an early transmission, there may be a slight mileage benefit ...

If you s/c your motor, I would have to say you need to rebuild the engine, with lower compression pistons. 8 or 8.25:1 max.

That depends on the amount of boost, cam choice and what pistons are used. I'm running 7psi boost with the Diamante cams and forged Wiseco pistons. My static CR is 9.05:1 ...

Paj, are you running the stock cams? I installed the Diamante SOHC cams and didn't get the expected results, so I'm considering changing back to stock cams to see if the results are better.

What type of dyno did you use? I used a Mustang eddy current dyno that factors wind resistance and weight ...

I "think" the new engine work is complete - now I need to do some tuning:

http://img120.imageshack.us/img120/3001/img4102eb8.jpg
http://img245.imageshack.us/img245/6858/img4107vq7.jpg
http://img404.imageshack.us/img404/3049/img4109bp5.jpg

The engine is a mixed breed..... SOHC Diamante block ...

Yes, sorry - I have a 3.0L 12v and think the world revolves around that engine.

If you have a 24v engine, they should fit.... at least the ports match - can't say about the length and turn. If you have CAPS, you could check for a cross-reference.

Frank

They are not the same:

http://www.rage.co.nz/pdf/flanges-Mar06.pdf

Frank

Thanks, fellas - I've found the info and bought a Diamante/Magna engine - will build a new S/C engine on that block - minus the 10:1 pistons, though. I do like the knock sensor and the longer duration cams.

Cheers,
Frank

Would anyone have the engine specs for the Mitsu/Australian-built station wagon that was sold in the US between '92 and '95? It was called a Diamante here - not sure what it was called at home in Oz.

I'm particularly interested in the 6G72 3.0L SOHC 12v variant:
1) HP
2) Torque
3) compression ratio ...

Nice work!

I'm also interested in the fuel pump replacement...... I'm looking for a Gen1 3.0L direct fit that will support 250HP at 55psi max...... 1 bar rail pressure about 40 psi.

I'd like to hear about the EMS ECU also - we have a supplier here, but I don't know much about the EMS units.... am ...

Thanks for the suggestion. The original crankshaft pulley certainly did create a problem, but some of the problem was eliminated via a factory TSB with a new crankshaft pulley bolt and a revised torque value. Still, I don't blame him for being concerned, since the dished pulley design puts a lot of ...

I hope you don't mind if I post some pictures on this thread - thought you might be interested in the way I've now reworked the fuel rail and installed a new 1:1 vacuum/boost-referenced regulator:
http://i80.imagethrust.com/t/1173499/img3668.jpg

http://i79.imagethrust.com/t/1173500/img3670.jpg ...

as you know it is a costly exercise with more money being spent on development as well as a lot of head scratching as you said every problem solved creates another.

Ain't that the truth! :lol:

I'm rebuilding another engine for a friend and can't get into my (blown) engine until I finish his ...

Congratulations! Most probably don't realize the head-scratching work necessary to do this.

I see you're feeding the rear of the fuel rail, but it looks like the regulator is fed via the rail front. What fuel rail routing are you using?

I originally tried to fit one of those Nissan blowers, but ...

If possible, identify the source of the noise and filter that component's output. If I couldn't identify the source, I would first try a noise filter on the power leads to the radio. If that didn't work, I'd try an alternator filter next. A marine supply may be your best source, if you're near the ...

"Better" is in the mind of the owner.

Centrifugal units are sometimes easier to install, but try finding a place to mount one on a Gen1 Montero/Raider/Pajero. At one time, I believe RIPP offered a unit that mounted outboard of the alternator. Centrifugal units build boost in the upper RPM range ...

....we do not know what boost ect we will get at this stage is 2.2-1....

If you're saying the pulley ratio is 2.2:1 and if the crankshaft pulley is the same diameter as mine (5.75"), then I assume you have a 2.6" blower pulley. That should turn the blower 13,200 rpms at engine redline and give ...

i assume an aftermarket ecu is a must?

I didn't think so if a rising rate regulator (FMU) was used. That lets you use the OE MAF and ECU, but I can't say for certain it would have been ok even if the fuel rail issue was corrected. The OE ECU ignition map on '89 US models runs from a low of 15 ...

Hi Mark,

Yes, I've done it.... sorta.....and in the process, I've managed to blow up a freshly rebuilt 3.0L. :lol:

Here's a picture:
http://i84.imagethrust.com/t/930222/img3439.jpg

Here's the design/build thread on 4x4wire:

http://www.4x4wire.com/forums/showflat.php?Cat=&Number=888365&page=0 ...