Saxo Problems & Queries If you're having problems with your Saxo and you're after a bit of advice, check this forum out... |
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1st April 2018, 13:52
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#1
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Established Member
Join Date: Jun 2009
Location: west mids (dudley)
Posts: 1,201
Car(s): cammed 106 flatty
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ZERO psi on compression test wtf???
Just done a compression test and heres my weird results.
Dry test
cylinder 1 = zero
cylinder 2 = 190 psi
cylinder 3 = 160 psi
cylinder 4 = 150 psi
Wet test
cylinder 1 = zero
cylinder 2 = 220 psi
cylinder 3 = 210 psi
cylinder 4 = 200 psi
so clearly i have a HUGE hole some where in the system for cylinder 1 to not create compression.
could this be related to timing? im guessing its got to be something with a stuck valve? even with bad rings, it would still produce some compression...
thoughts??
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1st April 2018, 16:28
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#2
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Frequent Poster
Join Date: Apr 2012
Location: Doyncaster
Posts: 783
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Has it just happened or part of a rebuild?
Broken valve spring, I'll go for.
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1st April 2018, 19:10
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#3
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Established Member
Join Date: Jun 2009
Location: west mids (dudley)
Posts: 1,201
Car(s): cammed 106 flatty
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part of a rebuild
i never saw this engine run however ive just replaced seals lapped valves etc
defo thinking its something to do with valves because even with a bad head or rings, id still get compression even if very low.
wish i had the means to do a leak down test but i dont
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1st April 2018, 21:38
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#4
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Frequent Poster
Join Date: Nov 2009
Posts: 576
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Bring it to tdc and blow air down the plug hole, you'll soon see where it's going.
Did you drain the followers?
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1st April 2018, 22:28
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#5
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Saxperience Forum Bum
Join Date: Jul 2010
Location: South Wales
Posts: 3,074
Car(s): ZX 16v, 205 GTI, 309 Goodwood, 405 MI16.
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8 or 16v?
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2nd April 2018, 01:08
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#6
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Established Member
Join Date: Jun 2009
Location: west mids (dudley)
Posts: 1,201
Car(s): cammed 106 flatty
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16v
gunna try rig something with a small air compressor tomorrow to see where my leaks at before i rip the head back off.
i didn't drain followers.
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2nd April 2018, 18:45
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#7
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Saxperience Forum Bum
Join Date: Dec 2012
Location: Perth
Posts: 3,663
Car(s): Peugeot 106 1.1 Turbo
Peugeot 106 1.5D Turbo
Peuge
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Does the piston move in the bore? lol
__________________
The rain kept a trollin'
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6th April 2018, 20:41
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#8
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Established Member
Join Date: Jun 2009
Location: west mids (dudley)
Posts: 1,201
Car(s): cammed 106 flatty
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lol xD
yes it does,
ive managed to do more diagnosis and have came to the conclusion it HAS to be top end causing me the issue. i tried a head with no cams in and it produced 60psi on that cylinder!! yet this other head with the cams in makes;
cylinder 1 - 0psi
cylinder 2 - 210psi
cylinder 3 - 200 psi
cylinder 4 - 200 psi
thinking either severe warpage or a big crack some where..
gunna wack those cams in the "good" head time it up and hopefully i have a result.
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6th April 2018, 23:36
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#9
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Frequent Poster
Join Date: Nov 2009
Posts: 576
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Put a cylinder leakage tester on it, you'll see where it's going straight away.
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The Following User Says Thank You to Chipwizards For This Useful Post:
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7th April 2018, 10:10
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#10
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Saxperience Forum Bum
Join Date: Dec 2012
Location: Perth
Posts: 3,663
Car(s): Peugeot 106 1.1 Turbo
Peugeot 106 1.5D Turbo
Peuge
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Quote:
Originally Posted by stevo1600
lol xD
yes it does,
ive managed to do more diagnosis and have came to the conclusion it HAS to be top end causing me the issue. i tried a head with no cams in and it produced 60psi on that cylinder!! yet this other head with the cams in makes;
cylinder 1 - 0psi
cylinder 2 - 210psi
cylinder 3 - 200 psi
cylinder 4 - 200 psi
thinking either severe warpage or a big crack some where..
gunna wack those cams in the "good" head time it up and hopefully i have a result.
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That's bound to be a visible crack if it's going that fast. that would be one hell of a warp, check it with a straight edge?
Quote:
Originally Posted by Chipwizards
Put a cylinder leakage tester on it, you'll see where it's going straight away.
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Pretty much this.
__________________
The rain kept a trollin'
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The Following User Says Thank You to MartinObviously For This Useful Post:
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7th April 2018, 14:36
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#11
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Established Member
Join Date: Jun 2009
Location: west mids (dudley)
Posts: 1,201
Car(s): cammed 106 flatty
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If only I had access to air!!
My valve lapping skills are atrocious
Just checked the valves and noticed if I looked down into the intake port I can see bloody daylight so was like errrrrr ok
Chucked some water in the port and in went straight past the valve seat and out the other side. 3 valves clearly not seated on that chamber 🙁 hence no compression!
Go ahead and say it guys, I’m a feckin idiot lol ah well live and learn I should have checked it with the water method before hand I guess.
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7th April 2018, 17:06
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#12
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Saxperience Forum Bum
Join Date: Jul 2010
Location: South Wales
Posts: 3,074
Car(s): ZX 16v, 205 GTI, 309 Goodwood, 405 MI16.
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sounds like you have bent valves from a fitting error, I haven't lapped any valves for years, however I have had them 3 angle cut and they seal beautifully.
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