LUVTruck.com

ok. ive heard from many sources that the truck and the impulse g200s had different compression ratios.

since ive got the impulse motor in my truck, what gives the impulse motor more compression? is it the pistons or the head that give it more compression than a truck motor?

and another question.

whats the differences between the g180 and the g200 head?

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"but its that gut feeling of you're drawn to what feels right for yourself and what you're passionate about..."

Id say the pistons.

I think they were 8.2 and 8.9 or something for the EFI.

Theres a few cheap impluses up on eBay at the moment.


Bob.

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Current project, 1979 KB Isuzu Ute.

Daily driver, '86 Rodeo Spacecab.
Chasing parts for Isuzu Impulse.

The info I have says 9.2:1 for the Fuel Injected Impulses, and I can't find specific info on the truck motor.

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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

sweet deal then. i had a guy on isuzupup.com that the truck motors ha dished pistons, and the impulse had flattops.

so being that a rebuilt kit for the g200 is only 210bux, id say im just gonna stick with the 4 banger... lol

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"but its that gut feeling of you're drawn to what feels right for yourself and what you're passionate about..."

It makes sense really, the FI motor has spark control and a knock sensor to cut out detonation. On carb motors they can't counteract the effects of varying fuel octane, so a drop in compression lets you pretty much ignore detonation at the expense of a little power.

Hmm, I should check the CR on the 2.3L impulse motor vs the Trooper. Could be they did the same thing, I know the Imp motor has a better flowing head and longer duration cam, so a higher compression ratio wouldn't be a surprise. I know it gave that heavy Trooper enough more kick that even my trusty butt-dyno could clearly feel it.

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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

well im runnig my carb intake and weber on the impulse motor, so i dont have the knock censor hooked up to do anything. i also used the dist out of my truck motor in the impulse motor, so i dont have any computer stuff to deal with.

did the impulse g200 have a different cam then the truck? im thinkin about using the cam from my old motor for a core to send to delta.

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"but its that gut feeling of you're drawn to what feels right for yourself and what you're passionate about..."

I don't know on the G200, but I know for sure on the 4ZD1 the Imp motor has 6 degrees more duration on the cam. Best way to find out would be to go into the forums/bulletin board over at http://www.4x4wire.com and look in the Isuzu forums for JLEMOND. He is a treasure trove of Isuzu parts info. I think he posts over at http://www.planetisuzoo.com too. Most of the other guys there are only up on the 4Z series or V6s, but I bet Jerry would be able to answer that question.

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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

Damn 800xl...one of these days we are going to have to take up a collection around here to get your fingers gold-plated....lol

You are truly a one-of-a-kind fountain of info on Luv's.

I humbly bow to you abilities sir.

I'm not worthy..I'm not worthy...I'm not worthy...

From all the books etc ive got here all the motors from G161Z to 4ZD1 (including 4ZC1 turbo) have the same grind cam and then the 2.6L motor has its own special profile.

But then i dont have books on the G200 and 4ZD1 impluse motors.


Bob.

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Current project, 1979 KB Isuzu Ute.

Daily driver, '86 Rodeo Spacecab.
Chasing parts for Isuzu Impulse.

mkay.

another question.

am i gonna have any problems putting a g180 head on my g200 block? im not gonna be doing anything to the head other than maybe a cam swap. ill more than likely use the stock impulse g200 cam anyways. ive heard that the water jackets dont line up and stuff like that.

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"but its that gut feeling of you're drawn to what feels right for yourself and what you're passionate about..."

As far as I know the heads will swap OK and if you are going to have you G200 cam reground...it will be done to your spec's which IMHO would be better than the stock Impulse cam anyway.

If you call them and tell them what you have and what you want...they will produce the cam best suited for your needs pretty cheap...as long as you don't get ask them to do anything too exotic.

yeah i was thinin about havin my cam done by delta to match one of those crow cams. thing is, i dont wanna go to crazy cuz i dont know anyone other than crow cams that has aftermarket valve springs to match a big cam.

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"but its that gut feeling of you're drawn to what feels right for yourself and what you're passionate about..."

What?!
Hes full of rubbish!

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1980 LUV 4x4, going under re-construction...

Ooooh...I'm telling!

lmao!

But seriously... you want to use new lifters, pushrods, valve springs, and cam bearings when you put in the new cam...and do a valve lash adjustment or you will be sorry.

You never want to use old parts when you put in a new high performance cam in any engine...because it will create a whole new set of problems later on down the road.

Ummm its a SOHC G seires Isuzu engine, the only bit its actually got that you mention replacing is valve springs.


I think there is a small water passage difference with the G200 to the two smaller motors but its no drama. The G161 head on a G200 is a common swap to boost the comp ratio.

The G200 uses a different timing chain tensioner setup to the G180 even though both motors are the same deck height. No drama here again.


Bolt on fit. Do the cam when you do the head, its near on easier to pull the motor right out so you can get the timing cover all sealed up again properly.

Cheers, Bob.

_________________
Current project, 1979 KB Isuzu Ute.

Daily driver, '86 Rodeo Spacecab.
Chasing parts for Isuzu Impulse.

Thanks for the correction...don't know what I was thinking.

See what happens when you are typing a post while talking to a customer on the phone...lol

But anyway...it will fit without too much bother.

And he's right - doing it all with the engine out would be my choice.

Yeah whatever you kilt wearing psycobilly. Of course to you that is a compliment.

As for taking up a collection, maybe I should put a paypal link in my sig for donations.

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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

so would that make you an information whore?
But anyway, when you drop in a cam its a good idea to replace everything that comes in contact with the cam also. Such as bearings and rockers. Also line boring would be a good idea. As stated before new springs is a must. That then brings up the fact that these engines like to stretch timing chains with high lift cams so you might as well invest in a new timing set...
Then you may as well shave the head for more compression and probly bore the block out and rering it too. Then you will probly also want to give the dog a hair cut as well. Dont question me, cutting the dogs hair is a good idea and will make the LUV run alot better...

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1980 LUV 4x4, going under re-construction...

I prefer to think of myself as an information pimp. I send it out on the street and it comes back to me with some extra. Like this thread, I pimp out the ho, you all pay me back with more info than I started with.


On the G series motors there isn't a lot besides the springs to replace in the valve train, but the timing chain would be a very good plan. If it is old and sloppy the extra stress of a higher lift cam might just push it over the edge. I know I would probably just run the rockers I have, but http://www.rockauto.com did carry them last I checked.

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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

Id run the ones in it too provided they check out ok.

If the motor has had a hard life its a good idea to check the end of the lash screws in the rocker arms. Ive seen a few of these pretty chewed up on Isuzu motors.

If your timing chain (belt in the case of a 4Z) has broken or come adrift, take care to check the arms for cracks ive seen them busted in half.


Bob.

_________________
Current project, 1979 KB Isuzu Ute.

Daily driver, '86 Rodeo Spacecab.
Chasing parts for Isuzu Impulse.