Is this worth doing?

 

I've had the one done on my radiator and being advised to do one where my spark plugs go to check engine compression.

 

They want to do this before i get the turbos replaced to make sure the smoke isn't engine problems.

 

Is this correct???

 

i have no idea what it all means and if it is a good idea how much should i pay? and what compression should our cars be running?

 

Also what does this test actually test?

They want to do this before i get the turbos replaced to make sure the smoke isn't engine problems.

 

Is this correct???

 

AFAIC you are being advised correctly. A compression check on each cylinder will give a very good indication of the general health of the unit.

All the plugs need to be removed and the compression tester screwed into each cylinder and a reading taken after cranking the engine.

Straightforward stuff and shouldnt take long/cost much.

Ask some of the engine experts on here what a good figure would be.

Ryan at Z Tech or Mark/Topless at Zen garage, or any other member with engine building experience.

I reckon if you've never had it checked it's a good idea anyway, let alone if you're having big work done too!

 

The cost will be minimal.

 

Do a search for "compression test", you'll find some good stuff. Here's one with a bit more info...

 

http://www.300zx.co.uk/forums/showthread.php?t=54707&highlight=compression+test

good good, i'll be getting that done then.

 

Thanks guys

good good, i'll be getting that done then.

 

Thanks guys

QUESTION? WHOS REPLACING YOUR TURBOS THEN AND HOW MUCH AND WHAT ONES ARE YOU HAVING .PLEASE INFO BECAUSE IM STILL SAVING FOR MINE.

When you say crank the engine, what do you mean (stupid question I know).

 

Dave G

When you say crank the engine, what do you mean (stupid question I know).

 

Dave G

 

you turn it over without starting - open the fuel filler cap and remove the pump relay is, i think, the general consensus...

 

usually worth testing 'wet' to avoid erroneous results - drop of oil in the cylinder.

 

HTH Rich

QUESTION? WHOS REPLACING YOUR TURBOS THEN AND HOW MUCH AND WHAT ONES ARE YOU HAVING .PLEASE INFO BECAUSE IM STILL SAVING FOR MINE.

 

I'm getting it done by a company called turbo technics but the turbos i'm having fitted wont be for sale for a while.

 

Have a word with one of the traders Topless at ZenGarage will sort you out, speak to him.

how much is a compression test?

"usually worth testing 'wet' to avoid erroneous results - drop of oil in the cylinder" ( Rich )

 

This is incorrect, adding oil into the cylinder will give incorrect readings and hide any piston ring probs, adding oil is only done if you have low compression and want to distinguish between rings and valves causing a problem.

 

Baz

done my comp test myself on sunday i got 135 lbs on all cylinders on a cold block and no oil