I had a compression check done today on my 97 LS motor with 90k miles, im putting a turbo on and wanted to chek engine condition. I hear these numbers are pretty good. what do u think? I know them all being equal is very good, is 165psi good for a LS motor though? This was done at a honda specialty shop, I didnt trust myself to do it right

1. 165
2. 165
3. 165
4. 165

 

That seems good for a car with a compression ratio like yours.

 

Thats what I was hoping to find out.

 

AH THats what i meant, I was hoping to find out what compression is stock on my engine

 

i got 180 across for all cylinders on my LS motor. only 9,000 miles on the motor.

 

ok, so my compression is a litle low (probably piston rings). BUt with 90k it should still be good for turbo rite?

 

My 1990 LS came out at 190 psi in all 4 cylinders with 154k miles. Your compression numbers sound just fine to me. Its all dependent on the compression tester as well as your elevation. When you test your motor the big thing that you are looking for is your numbers do not vary too much between all the cylinders. And the numbers that you have are well within acceptable range. Your motor sounds to me like its perfectly healthy.

 

165 seems low.

 

165 is fine... Ls's are typically 165-180 elevation and gobs of other factors make it vary a shitload.

-sam

 

after 15k of boost on my LS (~95k on the ticker now) i still get ~190's across the board.

also, if you are gonna be boosting, the mechanical upkeep on the car will be a lot greater than stock. the easiest thing to be able to do will be to do a compression check, it takes 15 minutes and their are any number of people on this board who would be willing to walk you through it. good luck.

Tom

 

How many times did you crank the engine? I konw the instructions i had said 5 but it should be morelike 8-10

--reid

 

I have 170 PSI in all four cylinder (B18B1 94).