Re: Corsa No Compression on 3

Iceviper <keith@xxxxxxxxxxxxxxx> wrote:
<snip>
compression. On all of them when the piston was going up a build up of
air could be felt on the hand and when the piston was going down it
created a vacuum on the hand. I have checked and there is nothing
obvious on the head or engine block. Any suggestions would be
gratefully appreciated

Have it excorsised.

Fit a bigger flywheel, and enjoy the fuel economy :)

Seriously though.
As the pistons seem to be sort-of-sealing, there should be at least some
compression, especially as you'd probably feel a fraction of a PSI with
your finger in the plug hole.
There are only two possible causes, AIUI.
Well, they boil down to one.
A valve is staying open all the time - maybe not the same one.
If it wasn't, then you would at least feel something.
Even with no head gasket, I'd expect to feel something.

(probably better ways)
Connect a vacuum cleaner on suck to the exhaust.
Turn it over slowly by hand.

Do you feel the sucking through the spark plug only when you should?

Repeat, with set to blow on the air inlet.

Otherwise I'm back to the 'made from metal dug up from a viking burial
ground hypothesis.'
.

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