Results of the Eurovision Comrepssion Test

[Nova_Tek]

Cheers to Adam & Meritlover who responded to my thread a short while ago regarding the compression test and how to do it.

I just did one and it looks pretty conclusive.

Cylinder 1 = 90 PSI

Cylinder 2 = 95 PSI

Cylinder 3 = 210 PSI

Cylinder 4 = 215 PSI

I did cylinders 1 & 2 again just to make sure I got a proper reading and it was the same.

[Philsutton]

3 an 4 are a tad high lol

[Nova_Tek]

3 & 4 tad high or 1 & 2 tad low?

Whats normal sort of pressure for a 1.2?

[Philsutton]

no they are both out, im not sure what they are supposed to be normally but most engines I have done have been 150ish or there abouts.

Also my corsa is 80 across the board lol

[Nova_Tek]

so this a head gasket problem? Worn valves? Piston rings? Bores?

What is the likely problem seeing as 1 & 2 has the same symptom and 3 & 4 has the same sympton.

[meritlover]

if your sure you did it with a wide open throttle (and choke off of course), then they look low.

repeat the test with about a tsp of oil down each plug hole, if the reading improves by about 10-30 psi then its likely bores/rings, if there is no change its head/valve/gasket related.

but its hard to say properly,
what engine is this exactly?

[Nova_Tek]

12st

[Nova_Tek]

Yeh my dad was at the helm told him to do a wide open throttle and im pretty sure the choke was all the way down as I left it in that state before I got out the car.

Either way whatever they problem is bore/rings or vavle/ gasket its a head off jobbie.

Which Im not going to bother with time to LET it. But im kinda surprised that it went as suddenly as it did seeing as 2 mins earlier it was absolutley fine and it wasnt being thrashed for me to say "yeh thats what made it go".

oh well thats life.

[meritlover]

sometimes engines just break. :(

[mowgli]

piston rings, not worth rebuilding a 1.2, get something bigger

[Adam]

Headgaskets gone in between 1 and 2.
And aye, they can just let go.

[mikey14sr]

yep there's definitly something wrong there, my 1.4 used to give 185 on all cylinders with the throttle closed....

[Nova_Tek]

piston rings, not worth rebuilding a 1.2, get something bigger

Yeh Im gonna start shopping round for LET.


Headgaskets gone in between 1 and 2.
And aye, they can just let go.

I know, its a shame, was such a solid engine kept going even when the big block Cavs ran out of fitness.

Just wasnt expecting it to go especially when it was running spot on. And not like I was thrashing it before it went so it must have just ran out of luck.

Well at least it makes it easier to get rid of the engine now :)

[Adam]

Fit a new HG, cost about a tenner to do.

[chimp007_uk]

£15 for a head gasket set :)

Did one the other day, took 2hours from start to finish and car running :)

[Welsh Dan]

My 1.2 has abour 220psi all round, so dont be worried by your readings for 3+4. Another vote for head gasket here, and you'll cause no further harm by taking the head off to check.

[Nova_Tek]

Yeh I probably could do a headgasket but I have deffinately out-grown the 1.2 now. Time for something a bit more grown up and something that will make driving the car on long journeys easier.

But I might do a headgasket anyway, think I got a headset in the garage from many years ago.