No oil pressure in the 1st 8 seconds, How to get turn of the key oil pressure Options

[Vietnam6871]

Engine is brand new 2.3 liter stroker that runs great except no oil pressure in the first 8 seconds then it runs fine with 30 lbs at idle and 60 lbs at highway speeds. Temp runs at 180 degrees normally with 210 being the hottest on very hot days. Any ideas on why it takes 8 seconds? Validated on dashboard guages and a mechanical guage. I can't drive this until I get pressure with the turn of the key.

[technicalninja]

I BELIEVE in Accusumps.

I think they should be a part of every serious build.

I ALSO believe in the electronic remote shut off valve.

Jump in the car, hit the Accusump release and see oil pressure BEFORE the crank moves.

You betcha! (IMG:style_emoticons/default/ninja.gif)


Having said that...

I think you have an actual problem that needs to be diagnosed FIRST.

From what I understand the T4 does not operate like a 911 six in that ALL of the oil goes through the pressure side of the pump before it feeds the cooler and the cooler returns it to the oil galleys.

Normal wet sump operation with the addition of 16+ feet of hose and the front oil cooler.

This system SHOULD NOT drain rapidly when turned off. The pump itself closes one end off and the engine oil clearances close the other end.

Does your build include 911 style piston squirters?
Those might create a drain path.

Do you have an oil thermostat?
If this will be used on the street you should.

Either way I'd try removing the oil cooler (looping line on engine) and see if that made a difference.

I'd check my oil level directly after a fully heated up drive and then recheck it 12 hours later.
Did it go up much?

I think you have a minor leak on the suction side of the system (internal in the engine) and the pump/pickup tube drains overnight.
Even this really shouldn't need 8 seconds to prime.

Excessive bearing clearance might be a culprit, but it would have to be BAD.

On installing the Accusump.

I'd want it feeding the engine as far from the oil cooler return as possible.
A big Accusump is 2 quarts and I'm betting your oil cooler and lines are more than 2 quarts.

I'd want my Accusump feeding the engine and not the cooler...

One thing that came up during my research into T4 mods/improvements.
The oil pumps suck big balls...
There can be a serious difference in pump quality and diameter between all of the different variants. It's EASY to end up with an internal leak between the case and pump that you cannot see/diagnosis easily.
Some pumps come with recessed O-rings specifically for this purpose.

The oil pump looked like it required extra care in selection and application to me.

 
I'm interested in how this progresses.