View Full Version : oil pressure?

06-13-2010, 01:00 PM
I was out on the lake yesterday and noticed the oil pressure on my boat was fluctuating between 40 and 80 psi. 40 @ idle and 80 under power running around 25mph. I do not ever recall the psi going to 80. The gauge pegs @ 80.

Is this normal or am I generating too many PSI's.

06-13-2010, 07:44 PM
10-30 PSI is normal on a 351 indmar at idle, 80 sounds like a lot for an hot engine.

06-13-2010, 08:02 PM
I would so normal...

06-13-2010, 08:17 PM
I'm having the same issue and I have the mcx motor. The only thing different I've noticed since this issue is the addition of two more fat sacks. So, I assumed the added weight was putting more strain on the motor. I have an X-9 which holds about 9 persons and lately I've had 6 people, a bow sack and another 750 lb in the center of the boat. Everything else seemed fine; temp and not burning any oil.

06-14-2010, 10:18 AM
My engine in 2001 ps205v is the same thing. 40 under idle, 80 or near 80 at cruising

06-14-2010, 12:57 PM
My LT-1 would read low, 15psi or so at idle, 40psi at higher rpms, and close to 80psi at full throttle. Not sure how accurate it was, but my MCX motor reads similar. I think those guages are more accurate than the idiot guages in our cars and I look at it like this. I've never had a small block Chevy lose oil pressure. I've seen alot of senders go bad and look like no oil pressure, so I figure if the guage is moving, it's good.
I pick the temp guage to stare at!:D

06-14-2010, 04:37 PM
My 1995 5.7L never goes below 40 psi either. I've never really paid much attention to it until a few people started asking questions about the "normal psi". I bought a mechanical pressure gauge ($16 at Autozone) this week and I'm going to check the actual pressure. I'll post it as soon as I check it. Not all sending units and gauges are 100% accurate, so I want to check for myself.

06-14-2010, 10:04 PM
replace the oil pressure sender. Mine went way out of whack with time -- thought I was having engine problems.... With a new sender, everything's back to normal

06-15-2010, 08:40 AM
I forgot to add it's a MCX 350 engine.

06-15-2010, 09:45 AM
don't be surprised if your real hot oil pressure is less than 10 psi. Most gauges won't show your real idle oil pressure so you don't get scared about how low it really is. The gauge is really just there to show if you have pressure or not. A low pressure warning light would really be better, but people like to see a little needle moving around.

06-15-2010, 09:49 AM
Mine pegs almost when I ski my wife tells me. At idol comes down and crusing at 20mph just between the two. I think all is well. I was wondering if maybe there was a slight blockage in the system causing the high pressure but it seems everyone elses here is high so I rest easy enough.