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Discussion Starter #1
Did this this morning. Engine warm

Cyl 1 , 120psi first crank, 135psi max
Cyl 2, 100 psi first crank, 135 psi max
Cyl 3, 100 psi first crank, 130 psi max
Cyl 4, 100 psi first crank, 130 psi max

Deviation looks good but overall numbers seem low? I know over 100 is ok but at 30000 miles should these be higher ?

Cylinder 1 where I have the suspected seal oil leak seemed fine or at least in line with the others.

One thing to note, I'm not sure if I could get the comp tester super tight...trying to screw in the thread using a flexi hose wasnt easy!
 

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Discussion Starter #2

Have a video as well (slowed to 50%) and you can hear me shouting stop to my helper at the end haha
 

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Hi Boddle lad, I think the 10% rule applies here with 100 psi being accepted minimum......could do with some other tests completed, I don't have a compression tester otherwise...Lusso folks not Abarth. Cheers
ron
 

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Thanks. Should be same between lusso abarth as blocks the same afaik?

I am within 7% which is fine...was just expecting more like 150psi!
 

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Thanks. Should be same between lusso abarth as blocks the same afaik?

I am within 7% which is fine...was just expecting more like 150psi!
Yes...9.8.1 compression rate....Just checked out a post on his Abarth from "Murat124" back along entitled "Cylinder Compression Test"...he records 1 to 4....162.5, 170,162, 165 and he had some 10000 mls on the clock.....if that helps.
30000 miles mostly balls out around Silverstone will have played some part in your results I would say..... :ROFLMAO:
 

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Discussion Starter #6
Hmmm...I mean it does a lot of short trips and I do get on it when I can but I dont hoon it everywhere.

Eveytbjbg I've read says as long as its 0ver 100 and ideally over 120 then rings are fine and within 10% between cylinders.
 

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Hmmm...I mean it does a lot of short trips and I do get on it when I can but I dont hoon it everywhere.

Eveytbjbg I've read says as long as its 0ver 100 and ideally over 120 then rings are fine and within 10% between cylinders.
Silverstone circuit was my little joke mate.....I would be thinking about rings and oil control ring before that long though, lots of specialist workshops up your way and prices always keen, but I don't see that you about to suffer a failure...So, why check the compression rates now? just nosey.... You said you did a home check with a little helper, any doubts get your local friendly and trusted garage to do a second test maybe. Cheers
ron
 

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Discussion Starter #8 (Edited)
I checked because of my oil consumption. Slightly blackened plug in cylinder 1 plus using 1 lite per 1500 miles currently.

:(

I think compression is ok...a trip to specialist will be happening.

Fresh oil in as well
 

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Did you check your compression with a wide open throttle? Like you should? A compression test typically is not a diagnostic tool for oil consumption. Oil rings scape the cylinder of oil and do not contribute to pressure sealing. Matter of fact, excess oil in a cylinder will raise compression reading. Remember the test for determining worn compression rings? Squirting oil in the cylinder and retesting to see if reading increases?
 

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Did you check your compression with a wide open throttle? Like you should? A compression test typically is not a diagnostic tool for oil consumption. Oil rings scape the cylinder of oil and do not contribute to pressure sealing. Matter of fact, excess oil in a cylinder will raise compression reading. Remember the test for determining worn compression rings? Squirting oil in the cylinder and retesting to see if reading increases?
WOT, warm engine, same cranks each time. Videos to show first crank increase.

No, I realise, however I am trying to gather as much data as I can before taking it somewhere, since I can do it myself. Mainly to make sure cylinder 1 (which always has the fouled plug compared to the rest). Realise oil rings scrape the oil, but there the other ring (compression) is designed to seal (I am pretty sure).

However, compression tests also check valves as well right, so any deviation would have possibly shown something up there...

I didn't do a wet test. I figured the readings were consistent, so if it really is rings, then they are all in trouble!

Next stop will be a specialist with everything I have gathered thus far.
 

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Discussion Starter #12
Will do, thanks for the input, it is appreciated. There was another chap on here about 7 months ago with the same issue - high oil use. His plugs look horeendous, but who knows.

These were my last ones at 6k miles. All but cylinder 1 look pretty good to me.

76490


New ones went in 100 miles ago and look fine.
 
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