Newly built 440 with low oil pressure

[khryslerkid]

Just try adding a washer to the spring. Nick added one after cam break in. It was idling in the 20s and after adding a small washer the engine had 42 psi at idle.

At the 31:00 min mark

 

[RJRENTON]

With a HV pump oil pan capacity is important, 7qt.

Not necessarily.....consider using GLYPTAL paint to coat the internal parts of the blocks interior surfaces to aid the oil drain back.....or....with the factory windage tray installed, and standard oil pan, and standard oil dip stick, i over fill by one quart....when the oil level gets to the full mark on the stick, I add a quart. I've not had an issue with oil starvation or oil foaming due to crankshaft interference.....but to each his own.....
BOB RENTON

 

[Bee1971]

In the paperwork you posted

M63HV Melling Oil Pump

Your already running the High Volume Oil Pump on that motor

 

[Bee1971]

One more thing

I did not see bearing clearances listed on your paperwork

 

[SlinktRR]

The only problems I see are the pictures of the gauges of the first post and that build sheet. The pressures you listed in the first post, I wouldn't be concerned at all as those are pretty normal numbers. The gauge in the picture though is showing 10psi, which I might be worried depending on the rpm/engine temp and in gear/park. Could also not be an accurate gauge throughout the range.

That build sheet looks like it was written on a post it note, I haven't seen that from an engine shop. Not nearly enough info on it. Is this using a 7qt pan like a milodon or is it a stock pan? You can change oil with something higher viscosity and see how it does, a 10w40 for classic cars may give you bit more idle pressure when hot, Gibbs sells that. Valvoline has the 20w50 vr1 as well which will increase it more.

 

[max340]

You dont have to change the pump for higher pressure, just put a stiffer spring in it

 

[Bob Benson]

Hello, I have a 440 in my GTX that was just built by a very reputable builder.
It was broken in and runs great.
At cold stat up 70lbs of oil pressure
Took on a 25 min ride on highway at 55 oil pressure is at 30-35 lbs when you come to a stop with car in gear it’s low I attached a pic. When you get on it alittle the pressure will rise to 60lbs. I’m lost. ? In park it’s 20lbs. Any suggestions would be greatly appreciated.

View attachment 1347662

What weight oil are you running in it???? Actually those pressures are not bad, even at low idle. But oil type and weight are part of what one considers in looking at pressure and RPM/

 

[RJRENTON]

The thread title said low pressure.

Mopar Performance BIG Block Oil Pressure Relief Spring P4286571 383 426 440 BB | eBay

Delivered pump PRESSURE and VOLUME Are inversely proportional. The pressure will rise as the volume is decreased. Conversely, if the volume needed is high, the pressure delivered will decrease..... if the relief valve spring were shimmed solid, and the volume needed exceeded the pump's capacity, the pressure will not increase...... the pump is a positive displacement device and is capacity limited by design and is rated at specified GPM (GALLONS per minute) at a specific pump RPM (of the pump not the engine). Just my opinion of course.
BOB RENTON

 

[INTMD8]

^ He certainly didn't read your post as it makes no sense to respond "The thread title said low pressure"

 

[440 PHIXX]

Delivered pump PRESSURE and VOLUME Are inversely proportional. The pressure will rise as the volume is decreased. Conversely, if the volume needed is high, the pressure delivered will decrease..... if the relief valve spring were shimmed solid, and the volume needed exceeded the pump's capacity, the pressure will not increase...... the pump is a positive displacement device and is capacity limited by design and is rated at specified GPM (GALLONS per minute) at a specific pump RPM (of the pump not the engine). Just my opinion of course.
BOB RENTON

I know one of the things the factory did on the Hemi, and perhaps the Max Wedge is increase the pickup tube passage to 1/2”. Obviously to allow more volume.

 

[Q360]

2 issues not mentioned, sticking pressure relief valve in the oil pump, air leak in the pick up tube connection (block pipe thread, or pickup screen). Oil pressure seems erratic. Remove the pump, check the relief valve. Even a fleck of metal will stick a relief valve, DO NOT radius the cut outs, they need to be sharp, minor scoring can cleaned up with Crocus cloth and kerosen. Idleally 20 psi at 750 rpm at idle, 10 psi acceptable (20 better) 10 psi per 1000 rpm are what these engines were designed for. Max oil temp, figure 250F on synthetic, 15W-50, peak oil temp is 50F over pan temp, so 300F. 180F thermostat and a good radiator, and good water pump will keep condensate out of the oil. Ideal oil temp is between 180-220F.

Hope that helps.

 

[Q360]

Part duex ,

If the engine has full grooved main bearing, stock was half groove, and large rod side clearance (radius fillet as opposed to grooved crank), then expect a 10 psi drop at idle. Early mopar engines 352/392 hemis all used full grooved mains, the modern, LA, RB,R engines all used 1/2 groove. This was done for improved oil control an not flooding the cylinder wall with oil, as posted earlier a HV pump helps but a high pressure spring does not increase flow UNLESS the pump can deliver it. A tight engine an hipressure/HV oil pump can blow a filter on a cold morning is you don’t let it warm up gently. Another bit of data is mopar gauges are regulated to 5 volts so the reading is independent of fluctuation in battery voltage. Cheap aftermarket electric gauges are not voltage regulated, cold tired battery start at 10 volts versus hot battery charge at 14 volts is a 40% swing on an electric gauge. Good to run mechanical or stepper motor driven electrical.

 

[Q360]

Oops 354 hemi, don’t shoot the messenger.

 

[RJRENTON]

I know one of the things the factory did on the Hemi, and perhaps the Max Wedge is increase the pickup tube passage to 1/2”. Obviously to allow more volume.

Always a good idea, as it reduces the pump's suction pressure losses (by allowing more flow) increasng the ability to provide more volume delivered up to the pump's design criteria.....its called NPSHr or Net Positive Suction Head required. Just talking out loud......
BOB RENTON

 

[Q360]

Always a good idea, as it reduces the pump's suction pressure losses (by allowing more flow) increasng the ability to provide more volume delivered up to the pump's design criteria.....its called NPSHr or Net Positive Suction Head required. Just talking out loud......
BOB RENTON

Good point. The hemis used the 1/2 pipe thread, wedges used the 3/8...the boss on the wedge engine is not as big so tapping to the larger size is a little tricky (use a tapered reamer first!!!). NPSH is an issue at high RPM but not at idle. Most hi volume pumps are a crutch for poor clearances, in general, but they are great in a loose engine. The HV pumps just use a Ford gerotor (tells you how loose ford engines are). With stock pan and a high-volume pump on a road course it is very easy to empty the pan.... hemi pan on a streetcar is a good compromise

 

[Kelly Seely]

Hello, I have a 440 in my GTX that was just built by a very reputable builder.
It was broken in and runs great.
At cold stat up 70lbs of oil pressure
Took on a 25 min ride on highway at 55 oil pressure is at 30-35 lbs when you come to a stop with car in gear it’s low I attached a pic. When you get on it alittle the pressure will rise to 60lbs. I’m lost. ? In park it’s 20lbs. Any suggestions would be greatly appreciated.

View attachment 1347662

Ya neither gauge looks that good to me, I would definitely keep an eye on the oil pressure for sure

 

[Archie Duiker]

Hello, I have a 440 in my GTX that was just built by a very reputable builder.
It was broken in and runs great.
At cold stat up 70lbs of oil pressure
Took on a 25 min ride on highway at 55 oil pressure is at 30-35 lbs when you come to a stop with car in gear it’s low I attached a pic. When you get on it alittle the pressure will rise to 60lbs. I’m lost. ? In park it’s 20lbs. Any suggestions would be greatly appreciated.

View attachment 1347662

Typically 10 psi per 1,000 rpm is normal for a stock build. 190 - 200 degrees is also ok.

 

[ka0mek]

Hello, I have a 440 in my GTX that was just built by a very reputable builder.
It was broken in and runs great.
At cold stat up 70lbs of oil pressure
Took on a 25 min ride on highway at 55 oil pressure is at 30-35 lbs when you come to a stop with car in gear it’s low I attached a pic. When you get on it alittle the pressure will rise to 60lbs. I’m lost. ? In park it’s 20lbs. Any suggestions would be greatly appreciated.

View attachment 1347662

oil pump? try a high flow oil pump

 

[BSB67]

oil pump? try a high flow oil pump

He already has one.

 

[RJRENTON]

oil pump? try a high flow oil pump

What do you think a HIGH VOLUME IS??
BOB RENTON