S70-R

That is a big ouch but if you confirm there's no cylinder damage those will be great news! How would a skirt break like that. Defective? If the oil pressure relief valve was stuck (closed) you were supposed to have excessive pressure when revving the engine and normal pressure at idle I think. Right? But that doesn't seem to be the case. It seems more like it opens at low engine speeds when it shouldn't open (stuck open?). They would explain the rod bearings wear but would not explain the skirt issue. Maybe the broken skirt contaminated the oil causing the oil pressure problems through the pump and relief valve.

Hussein, I'm really sorry about the situation. Situations like those are always hard to handle and to manage the feelings. But I agree with the other members. Get a temporarily replacement DD car and fix the XR. After so many years of effort and money creating such a unique car you shouldn't give up only because of a stupid piston/ring/rod/bearing, whatever. You have 99% of the hard job done in your car. I know it takes time and effort but you just need to open the engine and check the damage first and you have the knowledge and skills to do it yourself. If you hadn't it would be a much harder task. If there's no cylinder damage that's "easy", just replace the rod/bearings or piston/rings, whatever created the problem and try to evaluate what caused it so it won't happen again. Even if you need to rebore it or put new sleeves on it, go for it. Like I said, 99% of the hard work you have already done on your car so get the strenght to fix it and get it running again. I'm sure you will be pretty happy to have the XR running strong again and I also think that if you go with other route you'll probably regret of not having it fixed Parting out the car would also takes you a lot of time, effort and dedication (not to talk about loosing at least 50% of the investments you made on your car). And it wouldn't be easy from an emotional point of view as well. So, good luck and I'm sure you can do it! You have our support. Go for it!

Great pulls you have there Hussein!

boxpin, I'm glad you found the problem and the engine is OK. We hope to see the car running strong again!

The inlet and oulet vaccum nipples are in opposite sides of the valve.

One more engine man... that's hard! What a single and small mistake can do! Best of luck for the new build and don't forget to hook up the TCV correctly About the boost fade you were having. Did you check CBV?