compression = power?? - Corsa Sport - for Vauxhall and Opel Corsa B, Corsa C and Corsa D

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Warren G

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Registered: 14th May 06
Location: Kent
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28th Mar 08 at 18:57

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??

andyc1234

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Registered: 7th Nov 06
Location: Lancashire
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28th Mar 08 at 19:00

ported head shouldnt chage compression unless its had the chamber side worked on

Warren G

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Location: Kent
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28th Mar 08 at 19:02

lots of chamber work done

i meant in the combustion chamber

[Edited on 28-03-2008 by warren.g]

Vaux Lad

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Registered: 15th Dec 04
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28th Mar 08 at 19:09

Did you measure the chambers before and after?

andyc1234

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Location: Lancashire
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28th Mar 08 at 19:22

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

Warren G

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Location: Kent
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28th Mar 08 at 19:25

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

Vaux Lad

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Registered: 15th Dec 04
Location: Stoke-on-Trent
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28th Mar 08 at 19:35

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.

Warren G

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Registered: 14th May 06
Location: Kent
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28th Mar 08 at 19:41

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?

Dave A

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Registered: 10th Dec 03
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28th Mar 08 at 20:07

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

Warren G

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Registered: 14th May 06
Location: Kent
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29th Mar 08 at 12:54

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?

Warren G

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Registered: 14th May 06
Location: Kent
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2nd Apr 08 at 17:41

ttt

RCS

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Registered: 26th Jan 05
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2nd Apr 08 at 20:34

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.

Warren G

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Registered: 14th May 06
Location: Kent
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2nd Apr 08 at 21:16

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

RCS

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Registered: 26th Jan 05
Location: Lichfield/Dundee
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2nd Apr 08 at 21:46

Will be down to wear on the engine.

Warren G

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Location: Kent
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2nd Apr 08 at 21:50

done 56k

and when stripped look perfect tbh.....

RCS

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Registered: 26th Jan 05
Location: Lichfield/Dundee
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2nd Apr 08 at 21:55

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.