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whats the highest compression youve guys seen in a 1.8?
I think it says 170 in the book, that seems like a lot. I just did a rebuild im only gettin 135, up from 90 though.

To get the correct compression you should remove all spark plugs, have a fully charged battery and have the carb at wide open throttle.

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Certified pilots, looking down on people since 1903.

in addition to that.... its considered normal if the lowest compression reading is at least 75% of the highest reading.

I would consider 135 normal...170 seems pretty high to me for such an older engine...

but I am no 1.8 guru tho

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i just did a comp test and the lowest i got is 178 the highest is 183 the two inside pistons were in 178 and i think 179 the outside was like 182 183

I would consider 120-140 normal. If yours is that high it would only be---the head has been planed, much carbon build up, or your gauge is lying to you.

i neve thought about that, the motor was just rebuilt so i could see the head being shaved. anyway its all good cuz all i understand is mo power lol

thats really high, but good for you, more power in the luv the better!!!

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1979 4x4 LUV, rebuilt 1.8 and 27" bald tires

My 80 tests out to 195/200 across all four cylinders, but it looks like a G200 with a G180 head on it.

One other bit to make sure of when you run a compression test is that the valves should be adjusted right. That can bring your numbers way down too.

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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