Wow, guys lots of replies. I had to work with a friend yesterday and couldn't reply back. IJ, we don't have a problem with each other! Here is some background on what happened.
My motor got rod knock and I decided to get this block with new pistons and rings but all of my cylinders had good compression and no signs of lean out or detonation. It has NPR pistons and rings, I made a thread about it here recently to see if they were any good. Well anyways I decided to install this new block so I could get to TX2K9, because I worked for 4 months to get the drag racing done for the MK3's. And it was the best MK3 drag racing that I have ever seen and I didn't want to miss it.
I got the motor in and every thing was fine for a while, no leaks or anything, the car ran fine. About 50 miles into it, the car started to miss, kinda like a small vac/boost leak some where (I actually talked to Grim Reaper about it). My vac at idle went from 20-21 to 15-16. I searched all around for vac leaks and couldn't find one! Well the next day I was driving around the car and it was still the same but only at idle. I had a friend come over and look at it and we couldn't find the leak and we looked at the afpr went up to 35psi and I turned it down to 30psi and it seemed to help with the vac and it went to 17. So we decided to head to Houston. About 200 miles away from DFW we pulled over to get some drinks and take a leak. Yotarob was beind me in his car, when we stopped he said that he had little drops of oil on his windsheild and we looked under the hood and saw that the turbo line was leaking just a little bit on the motor mount. The car was missing again at idle when we left. So We were so close to the track at TX2K9 that I decided to get there and check it out.
When we got to the track, my oil was still full and my oil pressure was good! We Looked all around and still couldn't find a leak. The next day the drag racing classes take place. The car only acted funny at idle so I decided to make a pass. First pass was a 12.8 @110 and it was missing at the top end and didn't feel as strong. I talked with a couple people and told them the problems that I was having on the way down to Houston and the pass I just made and decided to change the plugs because they might have been fouled out because of running a little rich. When I changed the plugs they were all wore out, showed them to a couple that were over there while I was changing them and they said the same. But the #6 plug had a little oil on it and we saw a little oil in the Galley so I summed it up as it got a little oil down there. I fired the car up and it was idling at 17 again and it felt a lot better but still not quite as good. I went and made another pass and was missing all the way down the track and ran 13.0 @110. So I brought the car back and we noticed that there was a vac leak at the Power steering line that goes to the intake manifold. I just capped it off for the time being and the car wen up to 17 again at idle and seemed to be running much better but still not quite as good. I made my last pass and ran a 12.8 @ 112.5 and at the end when I let off there was a big cloud of smoke. I parked her and we we took out all the plugs and noticed that #6 was completely coated in oil. we took a straw and noticed that there was about 4mm of oil on top of the piston. We took all my old plugs and tried to change them out and see if we could burn off the oil. But no luck. I didn't want to leave my car in Houston so my friend Trent(super mod on SF) his house was about 100 miles away. Talked with Suprahero and what he went through last year on his way home and then I decided to drive it. I didn't want to leave my car at the track with my wheels and tires and all my tools in the back. We got some oil and had to stop to put it in. About half way there my oil pressure started going down fast about to 15 psi so we pulled over and put 6 more quarts of oil. We were half way there and it's about midnight and I decided to keep going. YotaRob had to stay about 1/4 mile back because of all the oil burning. We had to stop 2 more times to put oil in it. The car stayed cool, no knocking and oil pressure was good until I needed to put more in and we got there. The next day I had to go back to Austin to pick the car up.
I had to drive it into my garage and noticed I still had oil, and my pressure was good, let it idle for a min or so and no knocking.
Me and Rob summed it up as some thing didn't seal right or the piston was bad or something. And on the way to Austin the #6 was running lean because the plug was coated in oil and couldn't spark the fuel going in and made it look like it does in my crappy pics and blew the hole in the bottom of the piston. I think that if I Just left the car at the track and didn't attempt to drive it to Austin the piston wouldn't look like that.
The motor had 500 miles on it when it blew at the track.
I did have my injectors cleaned about 6 months ago as well, and they were all ok.
Sorry for the long post, but didn't want to leave anything out!
