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Edward Salem
TryHard
SA
Soarer 2.5GT-T and Commodore VP 1993 as a daily

Posts: 249
Reg: 01-2007

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Wednesday, December 05, 2007 - 06:12 pm, by:  Edward Salem (Sydeward) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Had a day off work today so i thought id give the "sitting beast" a compression test help decide whether or not ill be fixing her after I clear all of the insurance crap over the holidays.

Before testing I turned the car on for a few minutes till she idled at about 1k rpm and proceeded to remove all of the spark plugs.

Note: the idling is still very smooth, the engine harly shakes at all.

Results:

all of the spark plugs showed a moderate amount of dry burnt black residue, fairly even amongst all spark plugs covering the end of the tread all the way up to the head itself.

Warm compression test is as follows - note engine has done just under 190,000kms

CYL 1 - 155PSI

CYL 2 - 160PSI

CYL 3 - 160PSI

CYL 4 - 160PSI

CYL 5 - 158PSI

CYL 6 - 155PSI

The compression is even which is reassuring, especially on a car which has had turbo troubles prior to me owning it.

Just curious as to what other members soarers are holding compression wise and ultimatelly im curious to know how healthy my car is given the ks it has done...

Im on a tight budget but essentially im trying to weigh up either installing the TR44HF turbo kit ive got lying around, or sell it and drop in a fresh 1J engine...
Shane McInnes
Goo Roo
NSW
JZZ30 GT-TL Manual

Posts: 1164
Reg: 07-2005

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Wednesday, December 05, 2007 - 06:42 pm, by:  Shane McInnes (Soarin_tt) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

No idea what compression my engine has.

But i wacked on a set of roller bearing ct12a turbos when my engine had 220,000kms and i had 240rwkw up until 250,000kms from then on ive had 270rwkw and have about 260,000kms.

So aslong as you keep up oil changes the 1JZ is pretty strong.

Thats been on 20psi aswell. But doesnt see 20psi daily but does see 20psi a fair bit, and so far ive had no problems with the engine (knock on wood that continues)

Next time i change spark plugs ill get it tested and let you know what sorta compression i have.
Ben Socratous
Goo Roo
SA
I am the fibreglass/kevlar/carbonfibre king!

Posts: 1614
Reg: 07-2005

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Thursday, December 06, 2007 - 06:20 pm, by:  Ben Socratous (Socrates) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

I've got 2 cylinders running less than 100 psi and the rest less than 150psi!!!

Hence the 2J in the build :-)
Edward Salem
TryHard
SA
Soarer 2.5GT-T and Commodore VP 1993 as a daily

Posts: 250
Reg: 01-2007

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Thursday, December 06, 2007 - 09:31 pm, by:  Edward Salem (Sydeward) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

hey good luck with it mate! so thats why i dont see your little beast on the road eh?

well so far I can conclude my soarer is holding better compression than yours
Scott Ferguson
DieHard
Alberta
Soarer GTT-L

Posts: 891
Reg: 07-2006

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Friday, December 07, 2007 - 01:41 am, by:  Scott Ferguson (Scott_ferguson) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

On a little bit of a tangent what does strong vacuum mean in an engine, ie. what vacuum should the 1JZ be showing at idle and while crusing at say 100 km/h?
Edward Salem
TryHard
SA
Soarer 2.5GT-T and Commodore VP 1993 as a daily

Posts: 251
Reg: 01-2007

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Friday, December 07, 2007 - 09:25 am, by:  Edward Salem (Sydeward) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

are you reffering to rpm?

mine idles at around 800rpm when warm and cruises at 2500 - 3000rpm with overdrive on

nobody else got any compression figures i can reffer to?
Chris Davey
Goo Roo
QLD
Corona

Posts: 1519
Reg: 07-2005

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Friday, December 07, 2007 - 01:19 pm, by:  Chris Davey (Chris_davey) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

I have some but not on hand.

18 mm mercury for me at idle. stock cams.
Braden Murdoch
DieHard
NSW
Cressida 1JZ TT

Posts: 770
Reg: 04-2006

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Friday, December 07, 2007 - 04:00 pm, by:  Braden Murdoch (Ribfeast) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

When I checked mine in august, I got (dry):

178, 176, 178, 179, 170, 178. Not sure why I am down on cyl 5, ran it a few times to make sure it wasn't erroneous.

Make sure you run the compression test when the engine has been fully warmed up to operating temp, and do it with the throttle wide open.

You can drop a little bit of oil down each cylinder and see if the compression goes up, this will help the rings seal a bit better (aka a "wet" test). If it doesn't go up then your valve stem seals might be stuffed.
Danny Dinh
TryHard
Victoria
GT T

Posts: 309
Reg: 11-2005

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Friday, December 07, 2007 - 07:42 pm, by:  Danny Dinh (Xtc) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

mine is

193, 195, 195, 193, 195, 193. and the engine has done 260,000klms. Regular oil change is recommended.
Daniel Clarke
Goo Roo
NSW
TT 2.5L 6 cylinder

Posts: 2710
Reg: 03-2006

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Friday, December 07, 2007 - 07:49 pm, by:  Daniel Clarke (Dieseltrain) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Im gonna do a comp test when i change plugs in the new year. will be curious how my engine is holding up with all the punishment its recieved.
Edward Salem
TryHard
SA
Soarer 2.5GT-T and Commodore VP 1993 as a daily

Posts: 252
Reg: 01-2007

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Friday, December 07, 2007 - 08:24 pm, by:  Edward Salem (Sydeward) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)


Braden Murdoch wrote on Friday, December 07, 2007 - 04:00 pm:

When I checked mine in august, I got (dry):

178, 176, 178, 179, 170, 178. Not sure why I am down on cyl 5, ran it a few times to make sure it wasn't erroneous.

Make sure you run the compression test when the engine has been fully warmed up to operating temp, and do it with the throttle wide open.

You can drop a little bit of oil down each cylinder and see if the compression goes up, this will help the rings seal a bit better (aka a "wet" test). If it doesn't go up then your valve stem seals might be stuffed.



Danny Dinh wrote on Friday, December 07, 2007 - 07:42 pm:

mine is

193, 195, 195, 193, 195, 193. and the engine has done 260,000klms. Regular oil change is recommended.




thanks guys thats a tremendous help.

when I ran my compression test the car was idling at 1000rpm and was 2 bars away from the lowest temperature reading

first cylinder was tested with an open throttle and held 160PSI, 155PSI with the throttle closed so from this I can conclude that my readings wouldnt be much higher if I had tested all cylinders with an open throttle

havent tried a wet test yet, I might instead get it tested at a workshop for piece of mind as im not sure if my guage is 100% accurate...

if the results show up similar to my readings at home i may need to scrap the project and drop in a new healthy engine.

sigh... all this and i warmed it up and cooled it down obsessivelly, and would only give it a squirt one night a week, a couple of times...

ive always changed the oil regularly but i guess theres only so much you can do when the cars a bloody lemon eh =S
Blake Gloyn
TryHard
manawatu
soarer JZZ30 TT

Posts: 189
Reg: 02-2006

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Saturday, December 08, 2007 - 07:52 am, by:  Blake Gloyn (Blakenz) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

edward , one workshop showed i had 155-160, another showed 190-200, so don't worry too much(unless power is low). they are pretty even. Braden, having 1 cylinder at 170 compared compared to the other 5 cylinders average of 178 is nothing to worry about. Drive it like you stole it!oh, sorry... you do already :-)
Ben Socratous
Goo Roo
SA
I am the fibreglass/kevlar/carbonfibre king!

Posts: 1618
Reg: 07-2005

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Saturday, December 08, 2007 - 10:28 am, by:  Ben Socratous (Socrates) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)


Edward Salem wrote on Thursday, December 06, 2007 - 09:31 pm:

hey good luck with it mate! so thats why i dont see your little beast on the road eh?


Nah mate I'm still getting about the place, still need to get to and from work! It just sounds a little on the bogan side. Rocked up to a mates place the other day and his dad made the comment that he heard my bearings before he heard the exhaust!
Edward Salem
TryHard
SA
Soarer 2.5GT-T and Commodore VP 1993 as a daily

Posts: 253
Reg: 01-2007

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Saturday, December 08, 2007 - 05:06 pm, by:  Edward Salem (Sydeward) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)


Blake Gloyn wrote on Saturday, December 08, 2007 - 07:52 am:

edward , one workshop showed i had 155-160, another showed 190-200, so don't worry too much(unless power is low). they are pretty even. Braden, having 1 cylinder at 170 compared compared to the other 5 cylinders average of 178 is nothing to worry about. Drive it like you stole it!oh, sorry... you do already




Im not sure mate. Yes it was tested at home so im not sure if the readings 100% accurate. yes it idles well and dosent shake even at 600-800rpm but with all the bad luck ive had with this car its more the situation of the straw that broke the camels back even the little blemishes are making me sick in the stomach now...

i just want to sell it so that I can make way for my new car.

chuck a turbo on it and fix the panels and she'll be right. its hooked up with a nice exhaust system and only has external body damage, thus the structure of the car is A1.

I will let it go cheap shoot me over an email at
esalem86@bigpond.com if interested!

im also selling the TR44HF 1jz turbo kit for it. check out my thread in the for sale section for more details cheers
Braden Murdoch
DieHard
NSW
Cressida 1JZ TT

Posts: 772
Reg: 04-2006

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Monday, December 10, 2007 - 03:53 pm, by:  Braden Murdoch (Ribfeast) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

As long as there is no more than 14psi difference is it OK.
That is an awesome compression test result Danny! Was that dry, or wet?
My mate has mid 180's across his which I think is pretty good.
Ideally you want the compression to be above 155 or so. I think 128 is where you throw it away.
Edward Salem
TryHard
SA
Soarer 2.5GT-T and Commodore VP 1993 as a daily

Posts: 261
Reg: 01-2007

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Monday, December 10, 2007 - 09:19 pm, by:  Edward Salem (Sydeward) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

well the soarer has now been sold =( so many good memories but it just isnt practical for me to keep it...

will be missed, couldnt bare watching it being driven away but its all for the better

am on my way to importing a better car though so this sure hasnt deterred me from owning an import or toyota as such

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