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Ok I've got an 80' 4x4 with a 1.9 out of an 86' pup. I'm looking to rebuild or possibily replace. Is there any advantage with the 1.9 over the 1.8. I know it's for the most part the same motor. If not I'll proll just build the 1.9 back.[/b]

If it came out of a Pup, then it's more likely a 2.0 G200 -because the 1.9 G200Z motors were only put in Impulses.

The 1.8 put out around 75 stock hp and had air injection nozzles in the head. The Pup 2.0 put out around 90 stock hp, had bigger valves, and no air injector nozzles in the head to plug/block off. The Impulse 1.9 put out around 90-125 depending on whether it was turbo'ed or not.

The Impulse 1.9 had a little bit bigger than stock cam, taller flat top pistons, and a little bit stiffer valve springs.

The Impulse 1.9 and the Pup 2.0 will handle a weber 38/38, but the 1.8 has to use a weber 32/36 due to the smaller valves.

All can use the same transmission, electronic distributor/ignition module, coil, exhaust header, intake, etc - and used the same crank and rods, and were pretty much basically the same block - they just were bored differently and used different pistons.

Hope all of that helps ya!

Yea the guy I bought it from said it was the 1.9 so that is what I went off of. Is there any way to tell for sure? Thanks for the help.

Look on the block behind the alternator and the should me a marking either ...G180 for 1.8 or G200 for 1.9

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If when you take the head off you see taller than usual flat top pistons, it's an Impulse 1.9. If not, then it's a pup 2.0. Other than that, I have no idea.

The difference between the bores is not very much, and both are around 2000 cc's. The 1.9 is just a hair over 1900, and the 2.0 is just a hair over 2000.

If you want the exact spec's, I have an Impulse manual and a Pup manual and I can look them up for ya, but both have g200 on the block - so it's kinda hard to tell them apart.

I have an Impulse 1.9 in my '78 stepside, a friend of mine has a Pup with a 2.0, and the engines both look the same to me externally. If you had the VIN # of the '86 Pup you got the engine from, it would tell you, assuming that it was the original engine for that truck.

Since few people even know Impulses exist and that their engine will fit in a Luv, and their engines are not as easy to find as a Pup engine is, if I were a betting man, my money would be on it being a 2.0. Especially since it came from an '86 Pup and that was their stock G series engine for that year.

You will want to be sure what you have before you order any parts to rebuild it though, because there is a bit of a difference between the two internally.

Edit: Here are the spec's from Chilton on both the Impulse 1.9 and the Pup 2.0.

The spec's for the carbed Impulse 1.9's are: 1949cc's, 90 net hp @ 5000 rpm, 146 ft lbs of torque @ 3000 rpm, 3.47 X 3.29 bore and stroke, 9.2:1 comp ratio, 57 psi of oil pressure@1400 rpm.

The spec's for the carbed Pup 2.0's are: 2049cc's, 82 net hp @ 4600 rpm, 101 ft lbs of torque @ 3000 rpm, 3.42 X 3.23 bore and stroke, 8.4:1 comp ratio, 56 psi of oil pressure@1400 rpm.

I hope that helps ya!

Some thing is wrong on the spec's. The 1.9 is listed with a bore of 3.47 and a stroke of 3.29. Then the 2.0 is listed as a bore of 3.42 and a stroke of 3.23. How can a bigger stroke and bore be less cc? Also this would mean the cranks are different. The spec's for the 78 engine is 3.31 bore and 3.23 stroke.

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Certified pilots, looking down on people since 1903.

That was taken straight from a chilton's isuzu manual. I was a bit confused too because it appears that the Impulse 1.9 has more cubic inches of displacement than the Pup 2.0. The Impulse 1.9 has taller flat top pistons though, which is why it's compression ratio is higher than the Pup's 2.0 is.

I don't know if it's a typo, but it says the same for each year that both engines were used.

I have a factory Impulse and afactory Pup manual too, so I'll check them to cross reference these spec's and post what I find out.

On the Impulse stuff make sure you don't confuse the 1.9L G200 with the 2.0L 4CZ1 Turbo motor. The G200 is basically like the LUV G180 block and came only Fuel Injected but the 4CZ1 is a different animal and was what they stuck the turbo on. Close in displacement, but really different in construction.

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95 Isuzu Trooper Daily Driver
86 Isuzu Trooper reliable backup
77 LUV 2wd stock beltway blaster (resting)
79 4x4 LUV project: 2.6L, 5spd, 31s (eventually)

MEPR: Man, my 4x4 makes all other LUVs look good

Ok so the block is stamped g200. and it is a carbed motor, so is it the 1.9 or the 2.0 I'm gonna rebuild and want the buy the right parts. how much can I look at spending on rebuilding it to stock?

My best suggestion would be to invest a few bucks in a GM factory, Haynes, Isuzu factory, or Chilton manual. Then when you pull it apart, and check the specs for what you have with what is in the book, you'll know which engine you have and what parts you need to get.

With various versions of the same basic block being available at most junkyards, and you not knowing for sure specifically which version was stuck in there by the last owner, that is probably the safest way I can think of to be sure you are going to be able to figure out how to get the right parts.

As for prices, there has been quite a few folks around here that have rebuilt them, and a quick search here should find that info.

Will the Impulse motor bolt up the same, since the truck is a 4x4?

Yep...as far as I know.

The bolt pattern should be the same and all similar G180 and G200 Isuzu engines have a plate attached to the rear of the engine to match up to whatever transmission you are using and you can interchange them, so it should work fine.

You might have to use the Impulse's clutch parts, but you will want to replace them anyway - so that's no big deal because the Impulse had a decent clutch, pressure plate, and flywheel.

But just remember to look for the Impulse 1.9 G200 non-turbo'ed engine - then everything should be OK.

I believe an oil pan swap will be required also. Can someone please confirm?

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FIAA!

SFPP!

Yep...I forgot that.

It's oil pan is different shaped.