1.1 SPI, 78K

Cylinders 1 to 4 respectively: 140, 150, 200, 220

All done on warm engine with all plugs out. tested each three times.

Not done a wet test.

It's not really using much coolant at all and all the plugs look the same and a decent colour.

The reason for the test was a lumpy idle when first started and a bit of hesitation when giving it some when cold.

I was hoping it was plugs, leads or coil packs, but looks like the HG is going?

Wonder how long I can drive it without fixing it before it dies totally? I should start a sweep stake

Kristian

i'll go for next tuesday

Could be a day, could be weeks.

When I killed the HG on my old 1.1 SPI it showed similar results, then it had an 'attack' on the motorway (I was driving a bit quick) where it reduced power further.. still drove mind.

Did 3 and 4 pump up straight away and 1 and 2 wobble a bit?

Cheers

D

dronenrs said:

i'll go for next tuesday

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Not long enough

arc said:

Could be a day, could be weeks.

When I killed the HG on my old 1.1 SPI it showed similar results, then it had an 'attack' on the motorway (I was driving a bit quick) where it reduced power further.. still drove mind.

Click to expand...

Good stuff...if it goes I'll need it to get me home. I have never had breakdown

rallycinq said:

Did 3 and 4 pump up straight away and 1 and 2 wobble a bit?

Cheers

D

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Yeah, pretty much. What does that suggest?

Cheers,

Kristian

If it wobbles doesn't that mean bad piston seal? Eg bores have worn more than the rings can seal?

Thanks

X

Well I have a leak down tester I can use to check where the leakage is and give me more accurate results. If I can be arsed and can locate a compressor that is

I have a small hobby compressor :d.

Thanks

X

may do the trick. What pressure can it go up too?

Not sure, it was enough to push paint through an airbrush so maybe 30-50psi.

Thanks

X

All back together, new plugs and leads installed. I'll either fix it when it dies totally or next month sometime. Keep me on edge and make driving that little bit more exciting lol

chances are it will be the head gasket failed between the water jacket and no1 combustion chamber in the head

like this:


luckily, the head gasket on these engines can be changed by a chimp with a torque wrench

Indeed, but on two cylinders is a bit odd.

Trust me, i've done enough head gaskets and stripped enough FIRE engines to write my own workshop manual. I just can't be too arsed at the moment

I was going to run it for the year and then scrap it off, as it was only cheap. The mot runs out in august though, so it's either see if it lasts, or spend a bit of cash (defeats the purpose of a cheap run about). Could always dump the 1.4 in there for a few months lol.

Kristian

My best guess is that it's gone between 1 and 2. Still, a skim, new gaskets, a valve re-cut and a shim should leave change from 100 squid. Still a cheap runabout.

The fact that you have two ajoinng cylinders showing low and that they 'pumped up' as the test was being carried out, and the poor idle, but better performance at higher engine speeds suggests that the gasket has failed between 1 and 2.

While this will not seem to cause a problem if you keep above idle (the gas speeds are far higher and less chance to leak across) the cylinder head is probably being eroded by the exposure to combustion, so an early resolution to the problem is prefered.

Cheers

D

kritip said:

Good stuff...if it goes I'll need it to get me home. I have never had breakdown

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when the 1242 went into the water jacket though it was undriveable around 30 seconds after it popped;