Thread: 4J engine tech - and a crazy idea!

Originally Posted by isuzurover

I am still trying to find that out...

The exhaust is on the drivers side of the 4J motors, but that doesn't seem to be a huge issue.

Have you found out anything about similarity between the 4jb1 and 4jj1? I've just been having a trawl around the net looking for info and have seen that there is a small number of low KM wrecked Colarado's and D-Max's starting to appear at the auctions now and depending on what a wreck goes for it could be a reasonable engine conversion.

The other nice looking diesel atm is the 2.5l Duratec out of the Ranger but I cant see any easy way of sticking that into a LR.

Other than a slight increase in swept volume, what's the benefit of swapping the 4JB1 head over rather than just using the 4JB1-T as it is?

I have the 4JB1-T in my 90 if anyone needs any pics or measurements.

Originally Posted by the_grubb

Other than a slight increase in swept volume, what's the benefit of swapping the 4JB1 head over rather than just using the 4JB1-T as it is?

I have the 4JB1-T in my 90 if anyone needs any pics or measurements.

The 4JJ1 would probably have better head ports and breathe better. Whether this is worth the hassle of trying to make some mechanical injectors fit is another debate.

Originally Posted by the_grubb

Other than a slight increase in swept volume, what's the benefit of swapping the 4JB1 head over rather than just using the 4JB1-T as it is?

I have the 4JB1-T in my 90 if anyone needs any pics or measurements.

Yes - I have more or less decided that it wouldn't be worth the effort - I would probably have to buy two complete engines to do it.

I wouldn't mind having a drive of yours some time if that is possible. (and a chat about isuzu gearboxes...).

I am half inclined to set up a project for the mech/elec eng students to design (and possibly build) a diesel electric conversion for my IIA though instead. However I would need to find a 40+ kVa diesel genset first, that doesn't weigh as much as a house...

Originally Posted by isuzurover

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I wouldn't mind having a drive of yours some time if that is possible. (and a chat about isuzu gearboxes...).

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Sure is, although I am just about to strip her down as she needs a good 'service' plus I robbed the PS box to go on the 110 after it decided to spray its contents everywhere.... Chat's are welcomed anytime

Originally Posted by isuzurover

I am half inclined to set up a project for the mech/elec eng students to design (and possibly build) a diesel electric conversion for my IIA though instead. However I would need to find a 40+ kVa diesel genset first, that doesn't weigh as much as a house...

Is this at Curtin? Some of the mechatronics guys would love that sort of work

Originally Posted by Dougal

The 4JJ1 would probably have better head ports and breathe better. Whether this is worth the hassle of trying to make some mechanical injectors fit is another debate.

So if you were swapping the 4JB1 head over to a 4JJ1 you would still only get the swept volume increase...

Originally Posted by the_grubb

So if you were swapping the 4JB1 head over to a 4JJ1 you would still only get the swept volume increase...

Yes, which is kind of pointless as Isuzu already makes that engine (a mechanical direct injection 3.0). It's the 4JH1 used in Rodeos around year 2000.

A previous employer had a 2003 with the 4JH1, but I don't know exactly when they started or stopped using that engine. The 4JH1 was very refined and went very well in stock form, if you can find one, grab it.