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 Damn ka compression.

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greendefender123
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PostSubject: Damn ka compression.   Sun Jul 24, 2016 12:12 pm

Just serviced my partners KA it's had a misfire for most the time we've owned it. Changed and checked everything. Its got abit of a rattle noise which sounds like piston rings breaking up. Here's the before and after service compression results.

Before

D 1, 40 W 70
D 2, 70 W 85
D 3 75 W 105
D 4 80 W 85

After Service

D 1 40 W 120
D 2 135 W 145
D 3 145 W 155
D 4 150 W 165

Its fine under load but rubbish on overun and misses abit keeping at a constant steep and lost power. I'm gonna drive it till it stops as iv spent alot on this car. Drives much better after the service.

Cheers Steve
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Justwatching
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PostSubject: Re: Damn ka compression.   Sun Jul 24, 2016 2:06 pm

Interesting.

So, the improvement in compression is on account of the oil change?
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greendefender123
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PostSubject: Re: Damn ka compression.   Sun Jul 24, 2016 2:09 pm

Tappets im guessing.
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Justwatching
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PostSubject: Re: Damn ka compression.   Sun Jul 24, 2016 2:41 pm

Didn't think the ka had hydraulic lifters(?).
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greendefender123
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PostSubject: Re: Damn ka compression.   Sun Jul 24, 2016 2:44 pm

Its an old pushrod engine based on the old crossflow engine.
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Justwatching
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PostSubject: Re: Damn ka compression.   Sun Jul 24, 2016 4:30 pm

Then I'm still a little confused as to the compression gain. You adjusted the valves during the service?
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greendefender123
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PostSubject: Re: Damn ka compression.   Sun Jul 24, 2016 4:49 pm

No you adjust the tappets. Like on all old vehicles. This engine is based on a engine from the the 40s or 50s. Its very straightforward you have to get certain valves rocking and adjust the others. I done it nearly 3 years ago when we got the car. Its all part of the routine service on these but get neglected. Basically the valves wernt opening and closing as efficiently as they should. I done my landy afew years ago but with doing low miles it dosent need adjusting very often.
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edlithgow
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PostSubject: Re: Damn ka compression.   Tue Jul 26, 2016 6:11 am

IIRC a large "wet gain" is supposed to indicate cylinder bore or ring sealing. Low wet gain implies valves.

I can see why adjusting your valve clearance might improve compression.

I can't see why it would increase the wet gain so much on cylinder 1, which seems to be where the main problem is.

Maybe wet gain is just inherently rather variable.
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greendefender123
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PostSubject: Re: Damn ka compression.   Tue Jul 26, 2016 7:27 am

Its only a ebay compression tester.I don't think this car was serviced much before we got it. It was a mobility car to begin with and we have no history since and it still had a ford oil filter fitted. Think its been ran hot once when the heater valve went on motorway on my partners way to work. Runs fine under load just misses when you take your foot off the throttle and is under powered above 60mph. That's when you notice it anyway. Iv changed loads of bits like the exhaust coil pack sensors fuel filter the lot. Was gonna replace the inlet manifold as theyre plastic but was told to do a compression test as the rings go on these engines and it makes a knocking like noise as you pull away.

Should of scrapped this car at the beginning of the year but little things have gone wrong one at a time so iv just been fixing it for her as she needs it for work everyday. Just fitted 4 new tyres aswell. If it gets really bad I will swap the engine. Easy to do on these. It only needs a little bit of welding aswell. Needs to last atleast another year really.
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Justwatching
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PostSubject: Re: Damn ka compression.   Wed Jul 27, 2016 1:26 pm

greendefender123 wrote:
Should of scrapped this car

I know the feeling. My Rover's got to be welded yet again for this years MoT. Going to need four new tyres soon, too (they're all starting to crack from age). Oh, and the cambelt's due (plus tensioner and water pump). May as well do the thermostat since I'll have it out to back-flush the heater core. Anyway, back to KA...


greendefender123 wrote:
If it gets really bad I will swap the engine.

That's the spirit  Thumb
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edlithgow
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PostSubject: Re: Damn ka compression.   Thu Jul 28, 2016 2:02 am

Justwatching wrote:
greendefender123 wrote:
Should of scrapped this car

I know the feeling.

Me too. Back from Japan and warming up the engine yesterday to re-attack my un-resolved poor running, it blew the top radiator hose.

As always here, it'll be a hassle to source a replacement, so I'll try shortening it first.

This is a hose that I "experimentally" treated with sunflower oil. Maybe not such a great idea, though its an old hose on an old car so its failure doesn't necessarily prove anything.

There's always something, usually more than one thing. I console/kid myself with the thought that with every fix the car gets better, reversing the usual automotive engineering entropy.
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PostSubject: Re: Damn ka compression.   

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Damn ka compression.

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