Quote:
Originally Posted by astr
This swap keeps coming up time and time again! Please, someone do it and document it so that I have some one's example to follow.
I have a 4BD1T and a 4BD2T that I am considering swapping into my FJ62 after I finish my SOA (might be a while at my speed). The 4BD1T's came in Isuzu NPR trucks from '86 to '91. They were turboed but not intercooled and were rated at 121 hp @ 3000 rpm and 232 ft-lb @ 1800 rpm. They use an in-line mechanically-controlled injection pump and are direct-injected. The 4BD2T is basically the same block as the 4BD1T but the head configuration is changed to indirect injection. The 4BD2T's came in Isuzu NPR trucks (also re-badged as Chevy and GMC) from '92 to '97. They were rated @ 135 hp @ 2800 rpm and 255 ft-lbs @ 1900 rpm. The 4BD2Ts were intercooled in addition to turboed and I suspect the intercooler was primarily responsible for the increase in hp and torque.
The latter (4HE1TC) engines increased displacement from 3.9 to 4.8 liters, went to an overhead cam configuration and went to electronic controls on the injection. They also swapped the intake and exhaust sides of the engine so they are opposite to that of a LC. These engines were rated at 142 hp for manual transmission models and 175 hp for the automatics.
My understanding is that the bell housings are not interchangeable between the 4BD and the 4HE series engines.
I've been following the various threads discussing installing these engines in LCs but have not come across anyone who has actually done one, although some claim that it had been done. No one seems to dispute that this might be a great swap.
Most people seem to want to mate the Isuzu engine to a LC transmission or to another transmission for which there are adapters to LC TC (ie NV4500). I would like to consider using the stock Isuzu manual 5-speed and mating it to the LC TC, possibly using the Toybox as an adapter. Not at all sure if this is feasible.
The MSA5D 5-speed fully synchro manual transmission that comes with a 4BD1T has a 5.67 1st gear and 5th gear is 1:1 (no OD). Everyone that I know that has experience with these transmissions say they are bullet-proof.
The down side of using the Isuzu transmission is 1) mating the output to a LC TC, 2) setting up a means of shifting as these are not top-shifted but rather use a series of external rods and levers to connect the transmission to the shift lever.
I'd love to see someone undertake this swap project and post their experiences here.
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I may take you up on that ! Looked at a 4BD1T the other day, out of the truck, with the 5spd tranny attached.
I would like to consider a swap of the engine only, and marry it up to the Automatic tranny in the TLC (4 speed overdrive). Same bolt pattern?
This would be a town car of course. not a lot of lift, good efficient tires.