Hi,

 

Just need to verify a few things as I need to check my compression. I've looked at the write up on TT.net - http://www.twinturbo.net/ttnetfaq/FAQpages/compression.html and I've got a couple of question:

 

1. On the instuctions (with the compression tester) it says to remove one plug at a time, then replace, then go on to the next one but on TT.net instructions it says to remove all the plugs - which one is right?

 

2. Does it matter if the balance bar is attached or not?

 

Cheers

 

Vijay

remove all of the plugs - it takes the load off the other 5 cylinder

No, it doesn't matter if the balance bar is attached.

Cheers Guys!!!!

 

Vijay

one more question. When they say "pour a small amount of oil into the cylinder, how much do they mean?

 

Cheers

 

Vijay

A teaspoon full or two at most I would say.

cheers.

get engine to running temp, take fuel pump fuse out and depressurise the system (run till it stalls a few times) take all plugs out and have throttle wide open while testing.

 

I use 2-3ml of oil, but the really important thing is to use exactly the same amount in each cylinder because it occupies some of the compressable volume therefore affects the readings if different amounts are used in each cylinder.

5ml syringes are good for measuring the oil accurately, avail from chemist for about 20p.

 

You only really need to do a wet test if the dry test shows some sort of irregularity between cylinders.

Cheers Jezz.

 

Vijay

One thing to add, disconnect the cas to make sure no fuel is injected, made a difference to my results.