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> Engine gurus, Where do I go next? Tore down 2270, Burning lots of oil
DNHunt
post Jan 29 2005, 03:33 PM
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914 Wizard? No way. I got too much to learn.
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I drove 160 miles Wednesday trying to seat the rings. I used 3 1/2 quarts of oil. I would have made a Navy destroyer proud.

So, today I went looking for reasons. There was a small leak at the oil pump so, I resealed that and a little oil on the bottom of the oil filter. Neither could explain my oil consumption so off with the heads (and PCs too).


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rick 918-S
post Jan 29 2005, 04:59 PM
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Hey nice rack! -Celette
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Air cooled is not my thing but, who did the heads? Check the stem to guide clearance. Do the type IV heads have oil seals on the top of the guides?
That's a serious burn deposit on the piston tops and combustion chambers!

The other possibility is the crank case venting. Check the inside of the far end of the vent tubes to see if there is raw oil coming through. I attempted to modify my crank case venting once. The method I used caused the vent hose to act like a drinking straw. I had a clear line for a vent hose and you could actually see the oil move through the line just as a huge plume of oil smoke came rolling out the exhaust!

Also, The scuffing on your pistons skirts could have come from the early injection problems you were experiencing.an over rich condition could have been washiing out the oil control ring.

One problem I see is too many modifications going on at one time. You have a freah big bore motor with the potencial to have many issues that will need to be worked through, then you attempted to install an untested injection system without a good solid base line function. (IMG:http://www.914world.com/bbs2/html/emoticons/screwy.gif) I admire your drive and persistence. Hang in there you'll get it! (IMG:http://www.914world.com/bbs2/html/emoticons/clap.gif)
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DNHunt   Engine gurus, Where do I go next? Tore down 2270   Jan 29 2005, 03:33 PM
DNHunt   The engine goes like a bat outa hell but, it smoke...   Jan 29 2005, 03:35 PM
ws91420   Not knowing your level of expertise my first thoug...   Jan 29 2005, 03:36 PM
DNHunt   Cylinders 1 and 2 with oil in them.   Jan 29 2005, 03:37 PM
DNHunt   Cylinders 3&4   Jan 29 2005, 03:38 PM
DNHunt   Carbon buildup in chambers. Total mileage is 359 o...   Jan 29 2005, 03:39 PM
DNHunt   Carbon on pistons. The rings have moved since I in...   Jan 29 2005, 03:41 PM
DNHunt   The only thing I could see was all the skirts show...   Jan 29 2005, 03:43 PM
Series9   Wow! http://www.914world.com/bb...   Jan 29 2005, 03:55 PM
TimT     Jan 29 2005, 04:01 PM
Jake Raby   Dave, that looks very odd, almost like the engine ...   Jan 29 2005, 04:10 PM
Reiche   Sorry to see that Dave. Wish I was an engine guru.   Jan 29 2005, 04:16 PM
Jake Raby   I'm also sorry to see it, but its one of the q...   Jan 29 2005, 04:20 PM
9146986   I guess I'd start by checking the following: p...   Jan 29 2005, 04:41 PM
Jake Raby   All the things mentioned in the last post were che...   Jan 29 2005, 04:51 PM
Bleyseng   Dave, pull off a set of rings and use feeler gauge...   Jan 29 2005, 04:55 PM
Jake Raby   That was a full kit of mine. As for too many mods...   Jan 29 2005, 05:07 PM
Bleyseng   It ran pretty much smoke free with the test carbs ...   Jan 29 2005, 05:12 PM
Jake Raby   Thats what I was just thinking... I think that fu...   Jan 29 2005, 05:40 PM
Mueller   a little late now, but you think it has anything t...   Jan 29 2005, 05:44 PM
Jake Raby   Damage is done now. The pics of the rings look mor...   Jan 29 2005, 05:47 PM
DNHunt   Here's the top ring #1 .017 at the base   Jan 29 2005, 06:31 PM
DNHunt   Same ring and cylinder at the top .018   Jan 29 2005, 06:32 PM
DNHunt   2nd ring #1 .020   Jan 29 2005, 06:42 PM
DNHunt   Here's the best I can do showing the wear on t...   Jan 29 2005, 06:43 PM
914GT   Correct crosshatch pattern on those cylinders? Di...   Jan 29 2005, 06:48 PM
DNHunt   This isn't exactly the way I wanted things to ...   Jan 29 2005, 06:48 PM
bondo   I'm not quite an engine guru, but it seems to ...   Jan 29 2005, 06:55 PM
DuckRyder   You got Jake on the job, so I'm sure the botto...   Jan 29 2005, 07:01 PM
Jake Raby   Crosshatch pattern was set up and left from the Ni...   Jan 29 2005, 07:21 PM
Bleyseng   So he can just re ring? of course clean up the mes...   Jan 29 2005, 07:28 PM
SirAndy   dave, do you still have the oil from the motor whe...   Jan 29 2005, 07:39 PM
Jake Raby   With Nikisil its not quite that simple.. You can...   Jan 29 2005, 07:42 PM
TimT  
  Jan 29 2005, 07:45 PM
Jake Raby   The new rings probably would yet again have a hard...   Jan 29 2005, 08:07 PM
newdeal2   I'm sure glad I did my first rebuild on a simp...   Jan 29 2005, 08:14 PM
newdeal2   BTW...I'm no expert [yet] but shouldn't th...   Jan 29 2005, 08:19 PM
Jake Raby   This is odd with one of my kits.. In fact its a fi...   Jan 29 2005, 08:50 PM
J P Stein     Jan 30 2005, 09:12 PM
Jake Raby   jwalters, Call me out if you want but there aren...   Jan 30 2005, 09:47 PM
Bleyseng   There is the "right way" to do things in business ...   Jan 30 2005, 10:10 PM
Jake Raby   Exactly.   Jan 30 2005, 10:15 PM
newdeal2  

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