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Old July 31st, 2012, 05:44
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cruiser54 cruiser54 is offline
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Location: Prescott, Az
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Re: Looking for two build threads...unibody swap and engine swap

Originally Posted by Outlander560 View Post
so you would swap over a renix to a HO? That case no it would be a downgrade. Depending on what year "newer" xj you get depends on a few things as well as what axles you currently have you would need to give more info on this...
Not a downgrade. HO means Highly Overrated.

Only 8 HP difference between the two, and mostly because of the exhaust manifold and bigger throttle body. Most, if not all the 8 HP, is at higher RPM. Torque is the same.

If you use your HO manifolds and sensors along with the eexhaust manifold, you wouldn't know the difference.

For those of you considering swapping an HO into your Renix because you can't find a low mileage Renix around, here's how to do it. I've done 3 so far.

Any questions, post them up.

Cruiserís HO into Renix Swap
This swap is easier than some will lead you to believe, generally those who have never done it. Those of us who have done it, like myself, will share with you the things that need to be done for a successful swap. Just think of it as swapping in a long block.
The HO and Renix have some differences but none that canít be overcome very easily.
Any HO engine from an XJ or ZJ through 1998 can be used. One running change was that the rear of the head was no longer drilled and tapped for the temperature gauge sender beginning in the 96 model year. The sender can be relocated to the threaded hole in the thermostat housing taken from the HO engine. Youíll have to extend the wire to that location. Some brave souls even drill and tap the HO head for the sender.
You will be using the intake and exhaust manifolds from your Renix, along with all your sensors and wiring. Since the intake ports of the HO are slightly different, you use the Renix gasket. Exhaust ports are identical.
You will need to use your Renix distributor as it is different than the HO because they use different fuel management systems. The flywheel or flexplate from the Renix must be used so your CPS gets the correct signals. The valve cover from the Renix allows you to keep your CCV system intact and requires no modifications.
The HO block will have a plug in the coolant galley on the driverís side of the block, closest to the front, which needs to be removed so your Coolant Temp Sensor can be installed in itís place just as it is on the Renix. It requires a 5/16" square drive or a modified 3/8" drive that has been ground down to fit. Do this before installing the engine.
As for the knock sensor, which is located just above the oil pan on the driverís side of the engine about mid way, all the blocks Iíve seen are threaded for it. If not, Iíve heard they may be drilled but not tapped. Tap the hole if thatís the case.
Revised 07/24/2012
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