26 replies to this topic

[happydude2012]

Ok so did a compression test with me pal this morning 

We checked 4 times on each cylinder - results as follows/

 

 

1) 120

2) 120

3) 140  ??? what the hell

4)  120

 

So on a car that runs sweet as a nut (except for the weird tapping on rockers 1 and 2) and has smooth idol, smooth revving and no major issues - ive got cylinder 3 at 140 with everything else at 120.

 

10% of 120 being 132, im just outside the limit on 3.

 

This was a dry test by the way at normal running temp./

 

Any ideas lads?

Edited by happydude2012, 06 August 2018 - 09:03 AM.

[Steve220]

What were the conditions?

 

Hot or cold?

 

With a drop of oil or not?

[happydude2012]

hotish - did about a mile before the test - with no oil - i mean oil in the car, just not down the bores

Edited by happydude2012, 06 August 2018 - 09:07 AM.

[Steve220]

_{Worth getting a drop of oil in each cylinder and trying it again.}

[Spider]

Personally, I don't rate compression tests (nor leak down tests).

 

There are so many variables and it does not remotely simulate what's happen when the engine is running.

 

I wouldn't loose any sleep over those figures.

[unburntfuelinthemorning]

I presume oil finding its way into number three will give you a higher reading than the others - or it may be nothing.  Have you tried shining a decent torch through the spark plug hole to see what's inside?

[happydude2012]

if i run the engine to running temp and use a drop of oil down the bores - how much oil are we tallking? 5ml?10ml?

ready to do it so if someone could drop me a line with that knowledge ill crack on.

ive enlisted the Mrs to help ha ha 

[happydude2012]

ok - put a nice clean drop of 20/50 down the spark plug bores - results taken immediately as follows.

 

1 = 180

2 = 180

3 = 150

4 = 180

 

then i did 4 more sweeps - all showed the following

 

1 = 140

2 = 140

3 = 140

4 = 140

 

so guess i dont have a major problem here - apart from the cloud of smoke when i restarted the car because i put oil down the holes.

 

pheeewwwwwwwww.

 

now onto the next nonsensical problem that isnt a problem.

[Retroman]

yes Rowan

 

You will have to count the flies in your teeth with mirror hahha

[ACDodd]

If it's not burning oil, it just needs a valve job. Your engines telling you it needs maintenance.


Ac

[happydude2012]

Hi AC , not burning oil to my knowledge - well, no evidence of that anyway - i get a barely noticeable puff on cold start and the its clear all the way.

- valve job? would you explain that in dingbat terms just for me?

 

yes Rowan

 

You will have to count the flies in your teeth with mirror hahha

whos rowan? ha ha - wrong thread??

[ACDodd]

Remove the cylinder head and have the valves re seated to restore the lost valve seal. Engine will run better and with more power once valve seal is restored.

Ac

[russo]

Just sayin, if it ain't broken.....................don't fix it.

[Retroman]

 

 

yes Rowan

 

You will have to count the flies in your teeth with mirror hahha

whos rowan? ha ha - wrong thread??

   Who's that in your armchair on the roof...? Rowan Atkinson...your avatar

[happydude2012]

 

 

 

yes Rowan

 

You will have to count the flies in your teeth with mirror hahha

whos rowan? ha ha - wrong thread??

   Who's that in your armchair on the roof...? Rowan Atkinson...your avatar

 

 

ha ha ha  - of course!