Help with compression test results.

Post by **Vtecmec** » Fri Oct 16, 2015 9:45 am

Drax wrote:just follow the general guide and you wont go wrong

Actually, you will go wrong, the guide is full of errors, read all the comments too before starting.

89 UKDM BA4 4WS (resto job!) · Post by **wurlycorner** » Fri Oct 16, 2015 9:55 am

Post by **Drax** » Fri Oct 16, 2015 10:10 am

Vtecmec wrote:
Drax wrote:just follow the general guide and you wont go wrong
Actually, you will go wrong, the guide is full of errors

it is...?

ATR84 · Post by **ATR84** » Fri Oct 16, 2015 10:30 am

Head Gasket?

Bludge · Post by **Bludge** » Fri Oct 16, 2015 6:20 pm

Drax wrote:
Vtecmec wrote:
Drax wrote:just follow the general guide and you wont go wrong
Actually, you will go wrong, the guide is full of errors
it is...?

Lol, yeah it is. done all the reading and i was prepared to do it just never got around to it. will re-read it all again before tacking it though. im hoping its not the head gasket, got no other symptoms other then i lose water, but its been doing that the whole 2.5 years i have owned it. oil is never milky etc.

benthebratt · Post by **benthebratt** » Fri Oct 16, 2015 8:21 pm

what numbers should we be seeing as did mine only quickly as my battery is on the way out and all cylinders were reading 200

benthebratt · Post by **benthebratt** » Fri Oct 16, 2015 8:22 pm

by the way mine is the 5th gen 2.2

89 UKDM BA4 4WS (resto job!) · Post by **wurlycorner** » Fri Oct 16, 2015 9:15 pm

H22A1/A2/A3, cranking at 250rpm;
Nominal = 185psi, Minimum = 135psi, max variation = 28psi

Benthebratt - the 5th gen manual doesn't specify what engine the specs are for

but the numbers are exactly the same. So that would appear to be common for H22's...

Your figures are obviously higher than that Bludge - I would assume perhaps because cranking at a higher speed than the 250rpm specified in the manual??? (or gauge inaccurate)
Either way, cylinder 4 is way out of maximum variation spec.

gb-lude · Post by **gb-lude** » Fri Oct 16, 2015 9:40 pm

you can get bad compression because your valves are not set right but if it suddenly happens it's the head gasket.
Worn rings normally give a lover indication in all cylinders . Poor a few spoons of oil in the cylinder and do a test straight away. If it's better it's the rings. If not check the valve clearence .. If that doesn't help I'm guessing it's the head gasket .

By the way, you started on the drivers side? So you named the cylinder closest to your distributer 1 and the cylinder closest to the timing belt and camgears 4?? That's wrong...
Because it's normally cylinder 4 where the head gasket goes first. But your lowest compression is on cylinder 1 if it's a RHD.
Please let us know the correct cylinder numbers.

Bludge · Post by **Bludge** » Sat Oct 17, 2015 8:01 pm

gb-lude wrote:By the way, you started on the drivers side? So you named the cylinder closest to your distributer 1 and the cylinder closest to the timing belt and camgears 4?? That's wrong... ]

Yeah got them the wrong way round, so its cylinder 1 with the low compression.

wurlycorner wrote:H22A1/A2/A3, cranking at 250rpm;
Nominal = 185psi, Minimum = 135psi, max variation = 28psi

Your figures are obviously higher than that Bludge - I would assume perhaps because cranking at a higher speed than the 250rpm specified in the manual???

Errr?

How do i know what im cranking at? you know im rubbish at cars right....