How much is too much psi?
Thread Starter
|
Senior User
Joined: Apr 2006
Posts: 166
Likes: 0
From: Waco, Tx
How much is too much psi?
So I got the 445 up and going and it runs great. The only thing that concerns me is it holds like 62psi at idle and I cant get into any high rpm yet but cruising down the road it's somewhere around 75-80psi. This seems awfully high. I read the oiling mods word for word to the machinist. I just didnt expect such a difference.
Your thoughts....
Your thoughts....
FE "Freakin Expensive"
Joined: Dec 2003
Posts: 6,461
Likes: 4
From: Smith Mountain Lake, VA
Well are you running an electric Oil pressure gauge? Or a mechanical one ? You might have some tight clearances in the bearings...that will loosen up and drop the oil pressure after break in... and you may have a High Volume /high pressure Oil pump in it instead of just the High Volume ? and what weight of Oil are you running ?
FTE Leadership Emeritus
Joined: Jul 2002
Posts: 42,561
Likes: 423
From: Long Island USA
Around 80 PSI is where the stock oil pump relief valve opens up.
Sounds like you have a high-volume pump, which is going to keep running at or near the relief-valve setting until you get some miles on it.
The 390 I did for my highboy, with high-volume pump, would give almost the exact same readings yours does with a mechanical oil gauge.
That was with 20W50.
Sounds like you have a high-volume pump, which is going to keep running at or near the relief-valve setting until you get some miles on it.
The 390 I did for my highboy, with high-volume pump, would give almost the exact same readings yours does with a mechanical oil gauge.
That was with 20W50.
Thread Starter
|
Senior User
Joined: Apr 2006
Posts: 166
Likes: 0
From: Waco, Tx
Well it had a leak from on top of the filter where the sending units at. So with that fixed it now says 70psi at idle. The pump is the Melling m57hv. So I knew it was gonna be higher I just didnt know how much. The oil is 5w30. The engine builder said it's what he always uses for break in. If I need to run something different lemme know! Good to know that the psi is normal.
Thread
Thread Starter
Forum
Replies
Last Post
torquemeister
Cooling, Heating, Ventilation & A/C
5
Aug 21, 2017 01:51 PM
MagicMtnDan
2017 - 2022 Super Duty
6
Mar 16, 2017 12:10 PM
Resendiz
Pre-Power Stroke Diesel (7.3L IDI & 6.9L)
3
Jan 31, 2017 06:41 AM
BigCountry1978
1973 - 1979 F-100 & Larger F-Series Trucks
3
Jul 8, 2016 04:51 PM
rodneycrow
Cooling, Heating, Ventilation & A/C
2
May 11, 2016 12:10 AM
