Compression Test

[tm_r33]

Before some one says it, Yes i did search this first but can someone tell me how exactly an engine is compression tested and and give me a ruff idea on what sort of price i would be looking at for an rb25det.

also what sort of firgures are good. im guessing about 150 or higher or lower??

[4drftn]

not real sure on price, but one of my mates got one done at pro auto. i know in the end it cost him lots of pennies to get his motor rebuilt again...

[rollin_on_18_strong]

id say about 1 hour labour, with labour costs rangine from 55 to 95 dollars an hour,

i suppose 150 psi across all cylinders. with less than a 10% difference between readings

[tm_r33]

yer i thought about 150 was right... really its just for my piece of mind.

[rollin_on_18_strong]

yeah hopefully they dont break any coil pack connections............

[philmak]

what does an engine with mean? With a dry test.

1 - 125

2 - 125

3 - 100

4 - 100

5 - 100

6 - 100

It seems really low if the standard is about 150 :S....I know i should be looking at it in terms of varience, rather than the numbers themselves but 25 is a pretty large difference between some of the cylinders.

Edited November 18, 2007 by philmak

[mesmerized]

http://www.aa1car.com/library/compression.htm

from memory, think mine cost $130-$150??

Edited November 18, 2007 by into oblivion

[R34GTFOUR]

what does an engine with mean? With a dry test.

1 - 125

2 - 125

3 - 100

4 - 100

5 - 100

6 - 100

It seems really low if the standard is about 150 :S....I know i should be looking at it in terms of varience, rather than the numbers themselves but 25 is a pretty large difference between some of the cylinders.

yeah i wouldnt be too happy with those results. The actual figure doesnt really matter, its the varience between each cylinder that is a real indicator as long as each one doesnt read 0 haha.

a drop of 25psi is a tad too much in my books, how does the car run/idle? and whats the history of the engine ie kms etc?

the results show a tired engine, but not a broken one.

Edited November 19, 2007 by R34GTFOUR

[HUAWEI]

4-Cylinder:

two places quoted me for $80 and took around half an hour.

6-Cylinder:

three places quoted me $120 and took about 45 minutes.

You could get a kit for around $50 and do it yourself.

[VB-]

what does an engine with mean? With a dry test.

1 - 125

2 - 125

3 - 100

4 - 100

5 - 100

6 - 100

It seems really low if the standard is about 150 :S....I know i should be looking at it in terms of varience, rather than the numbers themselves but 25 is a pretty large difference between some of the cylinders.

too much variance. drop some oil down the cylenders and see what happens

[R34GTFOUR]

^^^

just make sure its literally a drop or two of oil, otherwise theres a good chance that you'll blow the comp gauge up lol

[Stinky Rooster]

Or, you could spend about $80 (cheapies start at about $30 from supercheap etc, but I don't trust them myself) on a quality compression gauge, disconnect the coilpacks, pull the sparkplugs and do it yourself?

why would you pay more than the gauge costs to get someone else to do it?