cloudy
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| posted on 30/6/09 at 09:04 PM |
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Calling all engine detectives! Where's my oil going?
As my other one died a death I've been forced into using this spare engine, which I was told had bad rings and used oil.
It's a GSX-R 1100WP (1993) with an overbore kit of unknown size/origin
It used over 1litre of oil going to Newark and back (200 miles) and smokes a little bit. There was a lot of oil on the exhaust side of the engine,
which I originally put down to the oil cooler take offs/oil filter - but the oil seems to be originating higher after removing exhaust
It made a great figure on the dyno, so it doesn't seem to be adversly affecting power
Facts:
Compression Test
Manual states range is 142-213 psi
Difference max allowed is 28psi
Results:
Cyl 1: 219psi
Cyl 2: 214psi
Cyl 3: 223psi
Cyl 4: 214psi
(Max difference 9psi)
Smoke Characteristics
Startup Video:
Vid Link
Smoke visible on dyno run:
Vid Link
Majority of smoke seems to be cylinder 4 (far right when viewed from behind, far left on the first video)
Exhaust valve pics:
Cylinder 1
Cylinder 2 - Looks bad but doesn't smoke?!
Cylinder 3
Cylinder 4
Engine block pics:
[Edited on 30/6/09 by cloudy]
www.warnercars.com
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coozer
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| posted on 30/6/09 at 09:08 PM |
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My old Z used to use a lot of oil, are you getting any smoke on the over run? Thats where mine was going.
I put it down to needing either a bore and hone or new rings. Never bothered though...
1972 V8 Jago
1980 Z750
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theconrodkid
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| posted on 30/6/09 at 09:16 PM |
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looks like valve guides/oil seals,needs a de coke as well,if you are using synthetic or semi it wont smoke as much as mineral but still uses the oil
who cares who wins
pass the pork pies
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nitram38
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| posted on 30/6/09 at 09:18 PM |
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I'd say valve guides/seals too.
If it was worn rings then your compression would be down and blowing oil out of the crankcase breathers.
Looks like you have a good bottom end, so why don't you whip the head off and redo the valve guides etc?
[Edited on 30/6/2009 by nitram38]
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BenB
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| posted on 30/6/09 at 09:36 PM |
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New valve stem seals please........
The burning oil after idling or start-up is the clue....
Of course you could just leave it, it's not going be down on power as a result (whereas it would if the rings were kernackered).
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nitram38
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| posted on 30/6/09 at 09:38 PM |
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It's going to be cheaper to do the seals etc, considering the amount of oil burnt on the way to Newark and back!
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cloudy
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| posted on 30/6/09 at 09:46 PM |
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Martin has a point! Cost as much in oil as it did in petrol!
Certainly i'll do the seals, the guides I believe require specialist tooling, has anyone any experience with them? What does everyone think
about the large amount of oil on the outside of the engine?
Could I swap the head on from my old engine which didn't smoke or use oil at all?
James
[Edited on 30/6/09 by cloudy]
www.warnercars.com
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graememk
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| posted on 30/6/09 at 09:54 PM |
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could you not take the head off the old engine and put it on the engine your using ?
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hughpinder
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| posted on 1/7/09 at 07:21 AM |
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Don't be fooled by a good compression test. I had exactly the same on a subaru - compression was perfect but still burning oil at about the rate
you are. The piston has different rings on it for oil seals and for pressure seals - thats why there's more than 1 ring per piston. It is
perfectly possible for the pressure rings to be ok and the oil seals to be failed.
Regards
Hugh
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MikeRJ
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| posted on 1/7/09 at 07:50 AM |
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quote:
Originally posted by hughpinder
It is perfectly possible for the pressure rings to be ok and the oil seals to be failed.
Agreed! It's also possible to get good compression even if the compression rings are a bit poorly if the cylinder has lots of oil in it.
If the heads coming of anyway, then it's not much more work to remove the barrels and check ring gaps etc.
[Edited on 1/7/09 by MikeRJ]
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cloudy
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| posted on 1/7/09 at 08:05 AM |
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OK, thanks all - looks like it's time to begin surgery. My first time!
James
www.warnercars.com
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