compression

[GTIR1000]

did a ompression test today and got


1:140psi
2:140psi
3:140psi
4:145psi

is this good or bad i noticed most peoples were up in the one fiftys and sixtys

 

[MarkTurbo]

Mine were all about 160 psi across all 4 cylinders but i dont reckon you've got anything to worry about there

Their all pretty even, which is the main thing.

 

[GTIR1000]

do uprated engine internals make a difference ie pistons and cams or head

 

[ard1ey]

Don't think anyone really mods the head, and cams shouldn't affect the compression. Different pistons could affect the C/R but TBH I'd look at the head gasket - there are several thicknesses easily available which would definately make a difference.

On the upside - lower compression = more boost

 

[mattygti-r]

ive got a compression test receipt from when teh previous owner had it (shortly after import)

think mines been rebuilt then

cos this receipt shows wayyyyyyyyy less than 140 across all 4

that was 2yrs ago thou and had no worries with teh engine 8)

 

[chris-b]

hay matty- it may have low comp pistons or h/gasket, and runnig std boost like you do would explain things!
put it up and over 1 bar!

 

[GTIR1000]

ok cheers for that it has got a metal head gasket on it an apexi one quite thick it was done about a year ago

 

[mattygti-r]

ok cheers for that it has got a metal head gasket on it an apexi one quite thick it was done about a year ago

my compression is somin silly like 112 across the board ?

ideas?

:shock:

 

[ard1ey]

You must have low compression pistons or a head gasket thats the thickness of an encyclopedia

 

[GTIR1000]

think i might have to turn the boost up a bit me thinks

 

[mattygti-r]

lol well i think ive just found out ive a little unknown engine

pistons and uprated headgasget nice :lol: 8)

 

[Sweeny]

Ive got a 1.8mm headgasket and JE Pistons and its fetching 120 which i guess is ok :? .

 

[Dooie Pop Pop]

lol well i think ive just found out ive a little penis HO HO HO

pistons and uprated headgasget nice :lol: 8)

maybe 2mm then. dont assume you have both :roll: take a spark plug out and shine a torch down there and look :!:

WARNING! this will possibly involve getting your hands dirty (you may even brake a nail :shock: )

 

[MarkTurbo]

WARNING! this will possibly involve getting your hands dirty (you may even brake a nail :shock: )

PMSL :lol: :lol: :lol: :lol: :lol:

Has Matty got girly hands and afraid to get them dirty then? :mrgreen:

 

[Dooie Pop Pop]

PMSL :lol: :lol: :lol: :lol: :lol:

Has Matty got girly hands and afraid to get them dirty then? :mrgreen:

Student hands, never swung a spanner their life imo :lol: probably a few minor calouses from all the typing and clicking. as for getting DIRTY pmsl...i was halfway through putting his wheels on for him and i thought like WTF AM I DOING! had too finish em off though didnt like the idea of 2 of his wheels being torqued up to 15lb ft... bless him :lol:

regards, stu

 

[mattygti-r]

PMSL :lol: :lol: :lol: :lol: :lol:

Has Matty got girly hands and afraid to get them dirty then? :mrgreen:

Student hands, never swung a spanner their life imo :lol: probably a few minor calouses from all the typing and clicking. as for getting DIRTY pmsl...i was halfway through putting his wheels on for him and i thought like WTF AM I DOING! had too finish em off though didnt like the idea of 2 of his wheels being torqued up to 15lb ft... bless him :lol:

regards, stu

last time i offer you a cup of tea! :lol:

erm no i dont tend to do the maintance on my car :lol:

im willing to learn but to be honest worried i would just break it lol :lol:

 

[Dooie Pop Pop]

PMSL :lol: :lol: :lol: :lol: :lol:

Has Matty got girly hands and afraid to get them dirty then? :mrgreen:

Student hands, never swung a spanner their life imo :lol: probably a few minor calouses from all the typing and clicking. as for getting DIRTY pmsl...i was halfway through putting his wheels on for him and i thought like WTF AM I DOING! had too finish em off though didnt like the idea of 2 of his wheels being torqued up to 15lb ft... bless him :lol:

regards, stu

last time i offer you a cup of tea! :lol: you make decent tea too, bitch

erm no i dont tend to do any maintance on my car :lol: :shock:

im willing to learn but to be honest worried i would just break into a sweat trying lol :lol:

fresh air,country walks and a night on the piss, thats what you need

 

[JamesB]

just a note- different cams WILL affect your compression depending on how wild they are.

I know of an mk1 escort with fomula ford spec motor that only managed 120 -125 all round within 5000kms of the build. It had 10.5:1 compression but the compression test showed bugger all.

This is mainly cause all your valves are open for a longer duration. Just something to keep in perspective with warm+ motors

 

[chris-b]

STU-your a funny guy!
:lol:
yeah thanks 4 fitting that kickplate trim back properly!
hah ha :roll:

 

[Dooie Pop Pop]