why does this happen ?
Aug 14, 2009 | 05:58 PM
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From: warrington
why does this happen ?
took my dumpvalve off the other day went for a drive and my oil cap kept poppin off , so i bought a brand new 1 and it still does it , so today i put my dumpvalve back on and its fine , why is it only blowing off when i dont have my chav valve on ? cheers
Aug 14, 2009 | 07:16 PM
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From: warrington
also put a new oil breather on and a checked all breather pipes for blockages
Aug 14, 2009 | 07:34 PM
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From: blackburn
your dumpvalve may be leaking a bit and letting a bit of pressure off the system, that's all i can think of.
Aug 14, 2009 | 09:11 PM
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From: Suffolk
Yeah, which if all your breathers are clear means your piston rings are fried!
Aug 14, 2009 | 09:56 PM
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From: warrington
dont say that , will a get a compression test done asap see what the rings are like
Aug 15, 2009 | 12:08 PM
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From: warrington
bad news , just had a compression test done 3 are showing 160 psi and 1 is showing 75
i take it this means i need a rebuild then
Aug 15, 2009 | 05:31 PM
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From: Suffolk
Oh dear! Yes mate
Aug 15, 2009 | 05:43 PM
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From: blackburn
bad news, that would be the problem.
Aug 15, 2009 | 06:25 PM
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From: hertfordshire
Quote:
Originally Posted by
ste45
bad news , just had a compression test done 3 are showing 160 psi and 1 is showing 75
i take it this means i need a rebuild then
160psi? thats like 10.7:1 comp ratio is yours a rs turbo engine?
Aug 15, 2009 | 08:21 PM
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From: warrington
Quote:
Originally Posted by
morph
160psi? thats like 10.7:1 comp ratio is yours a rs turbo engine?
yes rs turbo mate , can the rings just be changed or will i need a rebore ?
Aug 15, 2009 | 08:43 PM
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From: Croydon
Nearly 11:1 Compression ratio on a turbo lump is a wee bit high.
Either way, sounds like the engine is fubared.
Aug 15, 2009 | 08:59 PM
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From: Earth most of the time
Quote:
Originally Posted by
morph
160psi? thats like 10.7:1 comp ratio is yours a rs turbo engine?
eh wtf,u cant tell CR from a compression test
Aug 15, 2009 | 09:24 PM
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From: Croydon
Quote:
Originally Posted by
JamboRST
eh wtf,u cant tell CR from a compression test
Of course you can. As a rough guide 1 atmostphere is equal to 15psi.
So 160psi/15psi= 10.6 Atmostpheres
So its 10 times atmostpheric pressure. 10.6:1
Aug 15, 2009 | 10:37 PM
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From: Earth most of the time
Quote:
Originally Posted by
MadMac
Of course you can. As a rough guide 1 atmostphere is equal to 15psi.
ill repeat,u cant tell CR by doin a comp test.
a previous thread,post 8 by a man thats knows his stuff
https://passionford.com/forum/ford-e...ipping-it.html
Last edited by JamboRS; Aug 15, 2009 at 10:48 PM .
Aug 16, 2009 | 07:47 AM
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From: warrington
Quote:
Originally Posted by
MadMac
Nearly 11:1 Compression ratio on a turbo lump is a wee bit high.
Either way, sounds like the engine is fubared.
i thought about 160 psi was good compression for a rs turbo engine ? any way can i just replace the rings on the piston thats only showing 75 or shall i change them all ? will my block need rebore or can i simply just change the rings ? cheers
Aug 16, 2009 | 08:19 AM
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From: Buxton
Depends on how badly worn your bores are, my friend rerung his and fitted new shells and it became a good engine producing 150 bhp with only an exhaust and filter
Aug 16, 2009 | 01:52 PM
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From: Lancashire
160psi is about right for a good condition standard engine, which is 8.3:1 CR.
Aug 16, 2009 | 03:53 PM
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From: Suffolk
Quote:
Originally Posted by
JamboRST
eh wtf,u cant tell CR from a compression test
A big
+1 lol
Fresh engine should be around 170psi so 160psi is fine, just a shame about the other one
Aug 16, 2009 | 04:49 PM
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From: GLASGOW
Aug 16, 2009 | 09:35 PM
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From: hertfordshire
Quote:
Originally Posted by
JamboRST
eh wtf,u cant tell CR from a compression test
thats what i have allways been told on what the compression is.
Last edited by morph; Aug 16, 2009 at 09:39 PM .
Aug 16, 2009 | 10:27 PM
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From: Earth most of the time
Quote:
Originally Posted by
morph
thats what i have allways been told on what the compression is.
you've been mis-informed then
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why does this happen ?
dont say that , will a get a compression test done asap see what the rings are like
