79formula

I was watching videos of my boat running. I currently have 60hours on my 525sc (468/572hp) motor. No issues at all. I have a new livorsi electric oil pressure gauge and sender, verified with a mechanical gauge. I have a Melling M77HV pump. I have a hot idle pressure of 20-22psi, at 3500 its at 50psi, at 4500 its still 50psi. The engine runs perfect. Would you pull the motor to swap to a 10778 pump?

mike tkach

iTrader: (3)

i would have started with a 10778 because it is a better pump but to answer you,r question,i would not pull the engine now as it will be fine the way it is.what wt and brand of oil are you using?

79formula

Brad Penn 20/50 with a K and N 3002 filter.

Oil https://www.summitracing.com/parts/b...7119/overview/

1MOSES1

Nothing wrong with those pressures at all...

mike tkach

iTrader: (3)

^^^^^i agree,you will be fine.^^^^^^^^^^^

14 apache

iTrader: (1)

Cut the oil filter open look at it and if its clean put new filter on and have a nice day.

79formula

Seems like I should leave it alone. It either gets idled for 10 min out of the marina or run 4000-5000 rpm, not much in between. I am kinda hoping with 60 hours on it, I am in the clear.

79formula

I am running this https://www.summitracing.com/parts/sme-2015 bypass eliminator on the block with this spin on adapter. https://www.summitracing.com/parts/trd-1050
if you look, the left hole on the spin on adapter does not line up with the center hole. I wonder if switching adapter setups would help. maybe to this? https://www.summitracing.com/parts/ctr-22-592/overview/

MILD THUNDER

iTrader: (3)

the standard spring in the M77 pump, is set to internally bypass at 52psi.
Purple spring = 52psi
Black=60psi
pink=70psi.

79formula

It didn't come with any other springs. The 52spring would make sense.