Compression testing

[Jamieg285]

What exactly is involved in doing this - just pull all the plugs and turn the engine over a few times, reading 1 plug at a time?

Is this doable at the Fancott, or would it be better to borrow the tester for a while?

[55starchief]

The car needs to be at operating temperature first, then remove all the plugs and test each cylinder 3 times

[Jamieg285]

Quoting: 55starchief

The car needs to be at operating temperature first,

That'll be fun - getting the plugs out from behind hot headers.

[55starchief]

Quoting: Jamieg285

That'll be fun - getting the plugs out from behind hot headers.

yup mechanics gloves for teh win !!!!111111

[Jamieg285]

Quoting: 55starchief

yup mechanics gloves for teh win !!!!111111

Are they all heat resistant then?   I have some, but I didn't think they were?

[55starchief]

Quoting: Jamieg285

Are they all heat resistant then? I have some, but I didn't think they were?

as far as i am aware they are, dont try welding in them though

[Jamieg285]

So, gloves permitting, it could be done in a pub car park (this sunday, for example )

[Roadkill]

I don't remember my tester saying that it needs to be at temperature . . ?

[55starchief]

Quoting: Roadkill

I don't remember my tester saying that it needs to be at temperature . . ?

its done at temperature as the compresion dont matter when its cold at operating temp everything will have expanded etc

[Jamieg285]

You'd get a more accurate reading at operating temp, but I'd expect any major flaws to show when cold too.

[Roadkill]

Quoting: Jamieg285

I'd expect any major flaws to show when cold too.

Exactly.

How accurate does it need to be ?

I did my Hawk cold and it clearly showed #2 as having no compression.

I doubt being warm would've solved that problem !

[EDGE]

i think you have to disconnect the dizy low side and have it at WOT too.. to get a more accurate reading

EDGE