Warren G
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Registered: 14th May 06
Location: Kent
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most 1.6 x16xe's have (from what ihave tested) between 200-240 psi compression
my 1.4 had 190-200psi
now the 1.6 has 180-190 psi (due to the port and polished head??)
its already been skimmed, but is there alot more power available with another skim??
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andyc1234
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Registered: 7th Nov 06
Location: Lancashire
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ported head shouldnt chage compression unless its had the chamber side worked on
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Warren G
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Registered: 14th May 06
Location: Kent
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lots of chamber work done
i meant in the combustion chamber
[Edited on 28-03-2008 by warren.g]
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Vaux Lad
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Registered: 15th Dec 04
Location: Stoke-on-Trent
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Did you measure the chambers before and after?
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andyc1234
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Registered: 7th Nov 06
Location: Lancashire
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if its had combustion chamber done then yea it will be slighty lower. not sure if you wont notice it though without having a silly spec relying on high compression
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Warren G
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Location: Kent
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quote:
Originally posted by Vaux Lad
Did you measure the chambers before and after?
erm, no!
quote:
Originally posted by andyc1234
if its had combustion chamber done then yea it will be slighty lower. not sure if you wont notice it though without having a silly spec relying on high compression
well will be reving high, and that 30psi of compression could = more power
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Vaux Lad
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Location: Stoke-on-Trent
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More compression will mean you may have to run high octane fuel though, and have it mapped to run that fuel.
You should have measured the chambers, and worked out the proper compression ratio.
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Warren G
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Registered: 14th May 06
Location: Kent
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say i did, what difference would it made
theres only two ways of raising it back up
but dont realy want to skim it again uptill it needs it
and im 100% not skimming the block! lol
yet i know sound one else who has a chamber polished and ported but he has 250psi 
how much power difference would that make?
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Dave A
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Registered: 10th Dec 03
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compression and compression ratio are 2 very different things, compression ratio can be massively affected by working the combustion areas on the head but compression itself wont be affected by more than a few PSI.
to measure cylinder compression leakage, use a leakdown tester. rather than getting a reading that is affected by compression ratio, you will get a reading of cylinder leakage which is a far more accurate measurement
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Warren G
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Registered: 14th May 06
Location: Kent
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quote:
Originally posted by Dave A
compression and compression ratio are 2 very different things, compression ratio can be massively affected by working the combustion areas on the head but compression itself wont be affected by more than a few PSI.
to measure cylinder compression leakage, use a leakdown tester. rather than getting a reading that is affected by compression ratio, you will get a reading of cylinder leakage which is a far more accurate measurement
the cylinder head you sold gavin had 250psi compression
a tyical standard 1600 has 225psi
how did you get it higher when all the combustion chamber works been done?
so, it could be my rings if what your saying?
how do you work out compression ratio without taking the head off and cc ing it?
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Warren G
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Registered: 14th May 06
Location: Kent
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ttt
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RCS
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Registered: 26th Jan 05
Location: Lichfield/Dundee
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Compression test only measures how well a cylinder seals. To an extent it has an affect on performance. But it doesn't indicate true cylinder pressure. If you want to compare performance using cylinder pressures use BMEP.
Easiest way to work out compression ratio is to cc it.
And yes more compression does mean more power.
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Warren G
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Registered: 14th May 06
Location: Kent
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just seems although its down slighty
although nothing wrong with it, just woundering what has caused it and weather its right or not
as most are 30-40psi more
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RCS
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Registered: 26th Jan 05
Location: Lichfield/Dundee
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Will be down to wear on the engine.
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Warren G
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Registered: 14th May 06
Location: Kent
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done 56k
and when stripped look perfect tbh.....
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RCS
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Registered: 26th Jan 05
Location: Lichfield/Dundee
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It's nothing to worry about if you're not burning any oil.
There are lots of variables that effect the results of these tests.
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Warren G
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Registered: 14th May 06
Location: Kent
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i am
but thats not related
stem seals, gonig to remove the head and get the head pressure tested
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sand-eel
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do those heads not have squish zones then?
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Warren G
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Registered: 14th May 06
Location: Kent
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say what 
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RCS
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Registered: 26th Jan 05
Location: Lichfield/Dundee
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They do.
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