Strange oil consumption issue.
07-31-2011, 12:21 PM
#1
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Join Date: Nov 2005
Location: Michigan
Posts: 263
Strange oil consumption issue.
I just rebuilt my engine and had it bored .030 over with new reman GT40P heads, forged pistons, comp stage 2 cam, new ford lifters, scorpion rockers ect... Now it is 2500 miles old and it is still burning about a quart of oil every 200 miles or so. Two plugs were totally shot and covered in oil. (cylinders two and seven) Always smoke on high rpm decell or after full throttle. I pulled the heads off to check everything and I found the lower intake to be loose. I figured that was the issue. I still pulled the heads to clean them and I lapped all valves too. Everything appeared perfect (new seals, good guides, good seat contact pattern, etc...) I put it all back together very meticulously and I still have the same issue. Lots of smoke on a high rpm decell and plugs two and seven oily. I did a compression test too, all within 160-170 psi. I pulled the PCV hose out of the back of the block and plugged it, and went for a quick drive. That did not appear to help. There was what I would consider a lot of blowby coming from the breather on the valve cover (also carried some oil with it) with the PCV hose disconnected. I am really stumped on what exactly is wrong here. Could it still be rings on those two cylinders even though they did ok on a compression test? Maybe I somehow didn't notice that two of my valve guides were bad... Any ideas??
I'm going to begin taking it back apart again and i'll let you know if I find anything unusual...
Thanks!
I'm going to begin taking it back apart again and i'll let you know if I find anything unusual...
Thanks!
07-31-2011, 05:46 PM
#5
2nd Gear Member
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Join Date: Nov 2005
Location: Michigan
Posts: 263
MJR - I put sealed power moly rings in it
Well, I took the valve covers off along with the lower intake and both of the cylinders that have wet plugs have intake runners that are wet with oil. Even the injector caps on those cylinders are wet with oil. The top of the two valves have some oil on the top of them also. The whole intake and PCV valve are a bit oily, but that may be normal with a PCV system but I am not sure... I do have a new pcv valve, new screen, and a breather on the passenger side valve cover. The valve seals are still in place, so it looks like I may need to add additional breathers or there is a bigger issue with valves or rings. Still pretty stumped here
Well, I took the valve covers off along with the lower intake and both of the cylinders that have wet plugs have intake runners that are wet with oil. Even the injector caps on those cylinders are wet with oil. The top of the two valves have some oil on the top of them also. The whole intake and PCV valve are a bit oily, but that may be normal with a PCV system but I am not sure... I do have a new pcv valve, new screen, and a breather on the passenger side valve cover. The valve seals are still in place, so it looks like I may need to add additional breathers or there is a bigger issue with valves or rings. Still pretty stumped here
Last edited by DJ19895.0; 07-31-2011 at 07:13 PM.
07-31-2011, 09:11 PM
#7
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Join Date: Nov 2005
Location: Michigan
Posts: 263
Ok, I am now thinking it is probably the PCV system after a lot of reading considering the intake is covered in oil. I will probably either install another PCV valve or vent them all to atmosphere. It may also be a bad guide that I somehow missed when installing the valves.
08-10-2011, 09:16 PM
#9
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Join Date: Nov 2005
Location: Michigan
Posts: 263
After a few expert opinions, I tore the engine down. Apparently it is not possible to draw that much oil past the valve guides. Glad I did because i found four sets of oil rings that were not in the correct positions and four broken lower compression rings. Hopefully I will be able to re-hone, re-ring and go!
