Sorry for the long story but might be nessacary for a proper answer.

O.K. heres the senareo. When I first recieved the nitro harley it had no oil pressure, I removed the pump and discovered the o-ring seal was missing on top the pump. I replaced the seal and immediately got oil pressure. If youve followed this bike in step weve also had old fuel problems and also ironed that out. We went for a practice session at the track Sunday All seemed good. We warmed the motor up on alcohol as I was advised on here, then again on 94% nitromethane.

Now heres the problem, on the nitro warm up we had a solid 145 LBS oil pressure. He racked the throttle a few times to run in the clutch and then the oil pressure dropped to 90 LBS and stayed there. The bike was shut off and cooled for about 30 minutes. He was hessitant about the drop in pressure, so we fired it back up. It held at 90 LBS for a couple minutes then dropped to 45 LBS.

We shut it down and blew out all 9 of the oil lines one at a time, cleaned the resivoir, changed the oil, and started it again. The pressure went up again to 120 LBS, after a minute it dropped to 45LBS, then another 30 seconds back to 90 LBS, twenty seconds later back to 40 LBS, then 30 seconds later we were at ZERO. Well I pulled the pump again, The seal had a tear in it but I dont think enough to cause that or if it had anything to do with it to begin with. We cleaned out the system again and just cranked it over, not starting it. Still NO OIL pressure.

This leads to my previous leak down question posted earlier. We are hearing that if the rings are bad there will be NO OIL PRESSURE. That I dont get because it is a mechanical pump ran by the crank gear, and it blasts oil from spinning the shaft, but it will not fill the line to the gauge. I would think it would show some pressure at least, Is this true or will bad rings cause absolute ZERO oil pressure in this situation, and can both cylinders go bad within a few minutes to cause that? It did not sound odd or make any strange noises either.