Dooie' s compression test results

[Dooie Pop Pop]

Can someone please tell me if iv done this right? have followed procedure here: http://forum.gtiroc.com/phpbb2/viewtopic.php?t=27468

with engine cold no time to do hot test got to go to work

pot1=165psi

pot2=165psi

pot3=165psi

pot4=165psi

:shock: :shock: :shock: :shock: :shock: :shock: :shock:
have i done something wrong :?: at tops there might be .5 psi variation at the absolute maximum but without a digital readout i cant say.

what say you lot? the pots were clean, ie no oil.

my shitbox :lol:

 

[JIMMYBACK]

thats seems a bit high .maybe cos it was cold :shock:

 

[arry]

really need to do a warm test

 

[MarkTurbo]

Those results are spot on, your engine must be in good condition

I got nearly identical results (on a warm engine) that was with standard compression pistons and a 1.2mm hks headgasket

 

[Dooie Pop Pop]

Those results are spot on, your engine must be in good condition

I got nearly identical results (on a warm engine) that was with standard compression pistons and a 1.2mm hks headgasket

8) cheers mark, nice to hear something good for a change. work meant no time to warm car properly before test so did it cold. am gonna do it on a warm engine tomorrow.
bought the car last sept from runcorn the guy said the engine was well sound, it was. so i bought it cant understand why pressures so good :? if he' d had it a year and iv had it just over (which is bad for any car)and its 11 yrs old altogether shouldn' t it be lower :? dont doubt i' ll get a different story tomorrow :roll:
not sure how much difference it' ll make, i know some metals expand with heat differently to others, i decided to try both cos im curious like that. gotta admit i got a few butterflies about it (blessed in my ignorance and all that :lol: ) not being very experienced dont help but tbh id rather do it myself and learn

stu

 

[Mr GTiR]

165 on all four pots is good

let us know what you get when you do the compression test with a warm engine.

 

[Dooie Pop Pop]

165 on all four pots is good

let us know what you get when you do the compression test with a warm engine.

when i parked it up after its 'warm up :twisted: ' the oil temp was on 85 degrees C

just finished, no pics no time am well confused now cos ive got an avarage of 170psi across all pots, more :shock:

according to instructions suggests valve clearence or contamination which could explain because 2 of my spark plug seals are not very good and i got a little bit of oil on the probe end a couple of times cos i was trying to rush :x i did clean it off :roll: have i shagged my comp tester?

i did the test 3 times on all 4 pots and the highest i got was 171 and the lowest was about 169.

with each test i turned the engine over till the oil pressure light went out + a couple of secs for good measure.

engine oil is clean, no crap in it and radiator water is clean too. my ic is spotless and so is my dv

gave it 7000rpm in 1st, 2nd and 3rd in front of a mates mondeo yest :lol: he said exaust was smoke free...till he thought about it and then decided to say he couldn' t see where he was going the smoke was so thick :roll: :lol:

regards, stu

 

[MarkTurbo]

Thats the same compression tester i've got :lol:

I usually test mine when the oil temp starts to register on the gauge, but i did do it once just after i'd driven the car and i got over 170 psi too

 

[Dooie Pop Pop]

Thats the same compression tester i've got :lol:

I usually test mine when the oil temp starts to register on the gauge, but i did do it once just after i'd driven the car and i got over 170 psi too

once again thanks for replying mark a friend who' s a trained mechanic explained to me today quite logically that, i am 'a plonker' and 'you dont heat parts to measure tolerences on the bench do you?' stands to reason doing it on a cold engine should show the lowest compression and best indication of wear. he said he was tought to do the test cold

am now lookin for a light on a stick so' s i can see down into the pot and hope for nice things 8) before i get excited is that normal results then for an 11 yr old R' s engine?

next test matty' s :twisted:

cheers, stu

 

[JIMMYBACK]

o u can do mine as well then

 

[Dooie Pop Pop]

o u can do mine as well then

:shock: talk about the blind leading the blind :lol: better get my blindfold and 3 in 1 ready then.
next week at matts after 2pm. day tbc, matty' s tea bitch you can make me laugh and hold me nuts.

stu

 

[Fast Guy]

a friend who' s a trained mechanic explained to me today quite logically that, i am 'a plonker' and 'you dont heat parts to measure tolerences on the bench do you?' stands to reason doing it on a cold engine should show the lowest compression and best indication of wear. he said he was tought to do the test cold

stu

You're not a plonker :roll:..... Your mechanic friend should also know that most metal part measurements should be given at ISO conditions part of which is 20degsC So temperature is important

Anyway.......

The first line in the manual says Warm the engine, and it does say remove all the spark plugs, (remove centre ht lead, release fuel pressure and do it with a wide open throttle etc etc)

 

[Toady]

have no worries mate your engine is spot on!! from those results you need not worry unless you engine is smoking! mines all btween 150-160 (i think...cant really remember) but the ring lands have gone so it smokes like a biatch! 8)

 

[MarkTurbo]

before i get excited is that normal results then for an 11 yr old R' s engine?

If its been looked after then yes

My engine has never been rebuilt and its done 124,000 miles now and i still get over 160 psi across all 4 cylinders 8) I did the headgasket at 114,000 miles and when i looked at the bores they were hardly even worn

 

[Dooie Pop Pop]

a friend who' s a trained mechanic explained to me today quite logically that, i am 'a plonker' and 'you dont heat parts to measure tolerences on the bench do you?' stands to reason doing it on a cold engine should show the lowest compression and best indication of wear. he said he was tought to do the test cold

stu

You're not a plonker :roll:..... Your mechanic friend should also know that most metal part measurements should be given at ISO conditions part of which is 20degsC So temperature is important

Anyway.......

The first line in the manual says Warm the engine, and it does say remove all the spark plugs, (remove centre ht lead, release fuel pressure and do it with a wide open throttle etc etc)

i will earbash his unprofessional ar5e tomorrow thanks :evil: another test then :roll:

have no worries mate your engine is spot on!! from those results you need not worry unless you engine is smoking! mines all btween 150-160 (i think...cant really remember) but the ring lands have gone so it smokes like a biatch! 8)

this is a really wierd and wierder thing cos every now and then only for few secs but only a few and only rarely it does, a little tinsy bit....smoke :shock: :shock: :shock: :shock: :shock: :shock: :shock: there i said it only noticed it couple of weeks ago.
left it sitting outside matts ticking over for 15mins and it didn' t do it :? i give it 7K rpm in 1st, 2nd, and third in front of someone and it didn' t do it :? it taunts me with its little oily plumes :roll: vodka. as stated earlier ic is cleaner than a nuns crutch could an improperly plumbed catch tank cause it? catch tank to inlet disconnected already :? have been advised to cap the rocker cover to plenum breather too.

any suggestions?

problem sorted. the old t28 was on its last legs :roll: i found some oil on the exhaust tubine when i split it from the elbow, no smoke since

 

[Toady]

yeas the standard beather system is a bit poo! you could try a different one and see if that helps, either that or it could just be a puff of unburnt fuel or something? tbh mate it doesnt sound like anything to worry about!