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> Engine gurus, Where do I go next? Tore down 2270, Burning lots of oil
Mueller
post Jan 29 2005, 05:44 PM
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a little late now, but you think it has anything to do with the plumbing of the crankcase ventilation?

too bad you cannot throw a set of carbs on it to see if that changes anything.....I remember you saying your intake plenum and runners had oil in them, is that correct?

no chances that the dip stick is incorrect and that you had too much oil in the motor??
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Jake Raby
post Jan 29 2005, 05:47 PM
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Damage is done now. The pics of the rings look more and more rough every time I look at them.

You can never have enough crankcase ventilation- never...
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DNHunt
post Jan 29 2005, 06:31 PM
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Here's the top ring #1 .017 at the base


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DNHunt
post Jan 29 2005, 06:32 PM
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Same ring and cylinder at the top .018


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DNHunt
post Jan 29 2005, 06:42 PM
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2nd ring #1 .020


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DNHunt
post Jan 29 2005, 06:43 PM
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Here's the best I can do showing the wear on the rings


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914GT
post Jan 29 2005, 06:48 PM
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Correct crosshatch pattern on those cylinders? Didn't possibly overfill the crankcase before initial startup?
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DNHunt
post Jan 29 2005, 06:48 PM
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This isn't exactly the way I wanted things to go. But, I'm sure it will all work out in the end. This is something I did with my son so now I get to show him how adults handle disappointment (IMG:http://www.914world.com/bbs2/html/emoticons/sad.gif) . I think I'll have a beer or 2 (IMG:http://www.914world.com/bbs2/html/emoticons/beer3.gif) . I gotta admit I'm learning a lot.

Dave
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bondo
post Jan 29 2005, 06:55 PM
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I'm not quite an engine guru, but it seems to me that something must be wrong on the intake side of things for that much oil to be ending up in the intake. Is everything hooked up right in the PCV valve department? Are you running a common pelenum? is it full of oil? I'm just sort of thinking out loud and hoping something will be helpful. It's sad to see bad things happen to a nice engine.
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DuckRyder
post Jan 29 2005, 07:01 PM
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You got Jake on the job, so I'm sure the bottom will be gotten to on this, but:

In order for there to be oil on top of the intake valves and in the intake tract it would have to have such bad ring seal that it was pushing the oil into the intake through the crankcase vent system. The rings don't look that bad from what I can see.

Perhaps there are two issues.
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Jake Raby
post Jan 29 2005, 07:21 PM
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Crosshatch pattern was set up and left from the Nikisil platers, just like the other 60 engines I have built with Nickies- No changes there.


I am confident the fuel washed the lube away early on, wore the rings and things went down hill from there.


He has experienced .005 ring wear since the engine fired up, thats mopre than it should see in 40-50K miles IMHO

Those rings don't really wear at all in the Nickies, something acted as a catalyst- no doubt and I bet it was all the fuel...

As for the oil in the ports- Whenyou have that much oiland crankcase pressure is boosted on cecel/accel the oil will find its way through.
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Bleyseng
post Jan 29 2005, 07:28 PM
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So he can just re ring? of course clean up the mess.
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SirAndy
post Jan 29 2005, 07:39 PM
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dave, do you still have the oil from the motor when you took it apart?
did it smell like gas?

i ask because we took a 2 liter apart last night that looked just like your engine, same symptoms and the oil had a strong gas-smell to it.
the engine had a leaking injector and ran way too rich ...

(IMG:http://www.914world.com/bbs2/html/emoticons/wink.gif) Andy
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Jake Raby
post Jan 29 2005, 07:42 PM
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With Nikisil its not quite that simple.. You can't just re-ring, or atleast I never would..

Stuff is on its way to me, just talked to Dave...
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TimT
post Jan 29 2005, 07:45 PM
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QUOTE
With Nikisil its not quite that simple.. You can't just re-ring


errr why not?

If the Nikasil cylinder meets spec, why cant you re ring?
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Jake Raby
post Jan 29 2005, 08:07 PM
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The new rings probably would yet again have a hard time seating.

Any cylinder should be rehoned before a Re- Ring... The extra roughness scrubs the rings in for a faster and better seal....
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newdeal2
post Jan 29 2005, 08:14 PM
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I'm sure glad I did my first rebuild on a simple 2.0. It's helping a lot to listen and see these issues. I just happened to start out on the lean side not noing that a rich mix would cause problems like this.

Sorry it happened my friend. It's no fun having to take her apart and find that mess (IMG:http://www.914world.com/bbs2/html/emoticons/sad.gif)
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newdeal2
post Jan 29 2005, 08:19 PM
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BTW...I'm no expert [yet] but shouldn't the plugs be checked a few times durring break in just to gauge air/fuel mix, etc? That's what I have been doing ever since working thru carb issues on my GT6. I had some fun with "color tune" . It was pretty cool.
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Jake Raby
post Jan 29 2005, 08:50 PM
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This is odd with one of my kits.. In fact its a first to my knowledge.

I have supplied a 15 year old with a kit and he assembled it and now it has 70K miles on it...

In the world of mechanicl things you never know what the next turn of events may be..

Try fighting issues like this as a life- it sucks!
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J P Stein
post Jan 29 2005, 09:06 PM
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QUOTE (Jake Raby @ Jan 29 2005, 06:07 PM)
The new rings probably would yet again have a hard time seating.

Any cylinder should be rehoned before a Re- Ring... The extra roughness scrubs the rings in for a faster and better seal....

Odd.
With in spec Nikasil cyls (Mahle) the guy that sold me pistons had *very specific* instructions for getting the rings to seat....a bit odd I thought, but it worked.

Clean the cyls throughly (ID, of course) with soap & water.
Install the rings *dry*. Fire it up. & go play. The rings seated in prolly 50-60 miles. Non-detergent oil stayed in for 100 miles. I gotta admit, it was an act of faith.

I have found no one that recommends re-honing Nikasi cyls (till now).l
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