I have a new update on Party Gras, I took it out yesterday & my water pressure lines are plugged up with the fine silt that is in the water so I need to find a different place for that. But on the down side I have a oil pressure problem that starts @ 5000rpm. The boat runs & cruises fine, a little slow out of the hole but nothing to cry about. My oil pressure on the port engine runs40-50psi cruising, yesterday I pushed the sticks forward to 5000rpm & the port gauge dropped to around 15-20psi & was fluctuating rapidly. Pull back the stick & it jumps right back up to 45psi steady. I did this three times shortly & the exact same thing happened, back to the trailer. No odd noises everything tight all connections good, no oil loss or oily smell. Plan on installing a manual gauge with a t to verify oil pressure and verify gauge. I can also jump the wires to see if the gauge changes with the other engine. A friend suggested a restrictor failed & is pumping too much oil to the top of the engine, don't know but why would it only do it @5K &go back to normal once slowed down & right back to the same once 5K again. Any Ideas? I'm hoping it is something simple but right now I am at a loss. Could use some help if anyone has experienced this problem before. Thanks in advance, Randy

Sending unit?

Gonna install a manual gauge tomorrow & see how things go. Talked with the builder today & he seems to think the sending unit went out & also had me check the oil level which is a punch mark on the stick above the full mark. Both are full to the punch mark. I really hope it's something simple. I am also going to change the oil tomorrow, cut the filters open & see if anything bad is lying around in there. If all is well after that then I can address the prop slip issue of 22.9% If I can get it down to around 10% the boat should do close to if not over 90mph. I will be wishing for some luck in this department as a lot has happened in the last couple of weeks & months. I will post my results. Randy

Randy.. Been following the thread.. VERY well put together. Thank you for sharing, I can't wait for you to get your 90... That would be some real fireworks on the 4th of July. Best of luck.

Thanks o2bafloat, everything that has been done under the bonnet I pretty much learned from people on this website doing similar work on their own boats so I need to give some thanks to a bunch of people who have shared their work here. Without the people here who give their experience & knowledge to others I never would have attempted a project like this. Randy

Your oil pan is running out of oil at higher rpm. What kind of pans do you have?

Sending Unit, too much oil and getting aerated or not enough oil.

If the water psi hoses are in the block drains, the will constantly plug on the river.
What I did to help was to drill out the inner hose fitting so the hose would through it and into the block an inch or so. It still clogged once in a while. That was on my Pantera.
On my AT, the fittings are in the intake and they have never clogged.

Peyton, Black Baja, Griff, I think my oil problem is indeed a sender problem. After changing oil & filter, cutting open the old filter & finding nothing bad in there,( there was a minute amount of powdery stuff in both filters) I installed my manual gauges in both engines & they both ran 65-70psi @ idle til warm. I used a infrared gun on the filter to determine temp, @150 degrees they read 50-55psi @ idle. At 3-4-5000rpm they were both @60psi & steady while electric gauges read lower & fluctuating some. Griff, I have a spare fitting on the intake to mount my pressure gauges to so I hope that cures that. The 4th was a fun day with the wife & friends,and the grandson even brought the puppy dog. He graduated to big boy boats today. I have new sending units ordered so I hope that cures the problem. Thanks for your responses, I'm glad it wasn't anything serious. Randy

Well I replaced the oil senders in both engines, they both read close to equal but approximately 20 psi lower than my manual gauges. I guess I should call Livorsi & see if there is a resistor to put in line to make them more accurate, at least I know there is 20 psi even if the gauges are close to 0. I said earlier in this thread if I have any problems with my mounts I would give Sam (The Deep) first dibs on telling me "I told you so". I was looking things over last night & saw the mount nuts had worked loose, Sooo I pulled the drives, checked the alignment, still good, so I cranked the nuts down & did what I should have done and double nutted all 4. I also found a small oil leak, it feels like a fitting down at the block adapter so I will have to get a mirror down there for a better look. I have a friend that wants to try my shorties & he has stock length XRs so I think that is next to figure out my slippage issue, he also has some 30p 5 blade hydromotive (I think that's the name) props to try so stay tuned to my adventure in trying to find the big 90. Randy

Randy--- black baja could be right
I've had the same oil issue--- builder used stock pan and hv pump drained oil out of pan until it was sucking air. Then it blew a filter line rated for 2500 psi and by the time I got it shut down spun a bearing
Not sure what size pans you have but make sure they are big!