Re: 2 Much Sump Pressure
Hi, thinking about your problem a little more and i have a question after your comment about oil on the racetrack.
Is it LIQUID oil coming out of the dipstick or oil vapour, After 1 run and not always? Since i'm not there this might sound silly but is it possible that the churning of the oil might be going up the tube and pushing the dipstick out maybe because of a poor aftermarket windage tray, or the lack of one? or is it actually blowby (vapour looking, not fresh liquid viscous oil) Is it not also noticably chugging vapour like a train from the breather like bad blowby should? leaving oil film under the bonnet and windscreen?
You actually didnt think it was blowby at first, did you, and you might be right.
you should have a breather somewhere, if that is working and clear all the blowby vapour should be coming out of there if blowby is excessive, not the dipstick. If the crankcase blowby vapours havnt been coming out of the breather it could be plugged, a plugged breather wouldnt help the pcv vacuum in the crankcase either and the dipstick might even come out if the breather is blocked.
once you check that out, including the stuff on the previous post and still dont have a solution you should go over what you all checked during the measuring and fitting of the pistons and rings, like ring end gap, ring to land, are compression rings right side up, piston to cyl clearance (that would possibly be heard when cold) possible broken ring on installation, poor ring break in, list goes on... Fastening down the dipstick without solving the problem (if blowby related) would just blow a seal or gasket.
or why dont you just try a run without nitrous, if its blowby due to that extra pressure that would be a quick way to tell. on top of all that , probley wouldnt hurt to make sure ther are no other other external oil leaks. good luck.