Compression Test Results, update: new comp test results Options

[elvasoshexai]

hm.. this is kinda both engine and FI question... but i think i'll just put it here:

I had a compression test done today just to see how my engine is doing...
1st-150
2nd-150
3rd-140
4th-150

brand new engine would be approx 180 or so psi... but my numbers are still acceptable right?

i think anything above 100 is fine for stock engine and anything above 130 is fine for turbo engine?

my engine has about 100000miles on it...

even though these numbers are acceptable... is it necessary to take a further look into it?

with these numbers would it be safe to go FI?

This post has been edited by elvasoshexai: Sep 26, 2006 - 6:04 PM

[Bitter]

open or closed throttle, in my experiences, makes almost no difference.

The wet compression check is a follow up check useful to determine the condition of the piston rings. Some perform it every time they perform a compression check, others do not. I perform it when I see lower than expected readings, especially if it is only one cylinder. The common instructions are, "pour one teaspoon of oil into the cylinder and test". Frankly, I always spill oil all over when I try to pour it from a tea spoon into a spark plug hole and, then to compound the problem, always get caught trying to sneak the wife's teaspoon back into the house. Then, I learned a better way. Get one of the pump type oil cans and find out how many strokes of the plunger it takes to fill one, level teaspoon full. Then, you can insert the spout of the oil can and depress the plunger the required number of times without making a mess. Insert the oil into number one spark plug hole and repeat the compression test on that cylinder, note your reading under the "wet" column and repeat for the other cylinders. The wet compression check will, in most cases, be higher than the dry compression check. This is because the oil creates a better seal against the top of the piston rings and the cylinder bore. The LOWER the difference in readings between the dry and wet checks, the better the condition of the bores and rings.

http://www.custompistols.com/cars/articles/compression.htm