O-ring oil pump, Picture needed Options

[Chad911sc]

So on my new 2056 I have been getting low oil pressure numbers after the oil gets hot. I have 85 lbs at start up, but after it gets to 220, I’m only getting 5lbs at idle and 45lbs at rev to around 5grand. I do have an external filter/fan combo that could be contributing to my issue. After it gets past 190 the valve opens up and lets the hot oil into the external fan cooler combo. I changed out the 26mm oil pump to the 30mm offered on LN engineering, but still same problem. The reason I ask about O-ringing my pump is because when I changed out the pump to the bigger one, I noticed that my case was gouged in 2 places where the pump press fits into the case. I’m thinking that this could be my culprit. That the oil is just pushing back into the sump from those digs in the case halves. I also ordered the piece from Tangerine racing to replace my oil valve spring inside the case, as I still am using the stock spring as of now. I’m going to pull the pump back out of the case this weekend and I will post a couple pics of the gouges in the case.
I was wanting to know exactly where this o-ring would go on the pump, so I can take it to my machine shop and have a grove beveled into it. One more thing out of the equation to solve this problem.

[cgnj]

I'm going to pm you about this.

[JamesM]

1. Which 30mm pump?

2. Were the clearances in spec?

3. Have you replaced/fixed/upgraded your oil pressure relieve valve?


https://tangerineracing.com/shop/ols/produc...re-relief-valve

[Superhawk996]

All T1 pump bodies are undersized vs proper T4 pump and are basically a built in leak path regardless of gouges. This leak path is right at the inlet/outlet of the t1 pump and the case and represents a leak before any oil pressure even gets out of the pump. Well documented so not going to rehash it here in detail.

How big of gouges are we talking about?

If you have gouges not sure how much help you’re going to get from an O-ring.

Regarding o-ring pumps - not recommended to install once the case is assembled:

“Info about O-Ring oil pumps.
You can not install a "O" Ring pump after the motor is assembled. The two case hafts must be placed around the pumps "O" Ring seal. If you try to install the pump you will damage the "O-Ring".
If you have any questions or need help please call or send us an e-mail”

https://www.lowbugget.com/oil_pump.html

[Chad911sc]

Yes I ordered the Tangerine racing oil relief valve already. I will put that in first and see if it is the problem with my system. If it doesn’t work, I will pull the engine, take it back apart, check my bearings, and proceed with an o-ringed pump. The pump in there now is a 30mm Schadek pump from LN engineering.

[Geezer914]

I have a 26 mm pump from CB performance. 80 lbs.cold and 40 lbs. at 190° , 3500 rpm cruising speed. External oil cooler opens at 180°.

[cgnj]

@Geezer914 Did the CB pump require any prep work before installation. I have one in a box. I just measured the diameter of the and it was in the middle of the tolerance.

[Chad911sc]

That’s what I had in my engine when I built it, the CB maxi-pump 26mm. Changed it out due to low pressure. Obviously that wasn’t the problem because the 30mm is not providing the pressure when hot either. Hopefully the Tangerine valve will fix it. I always wonder if the oil level is correct on my dip stick. It shows full, but if the oil is draining back into the sump after it is turned off, my oil level is actually low due to the hoses and cooler itself.

[Superhawk996]

Obviously that wasn’t the problem because the 30mm is not providing the pressure when hot either.

That’s some faulty logic there - if you have a leak between the pump and case - a bigger pump doesn’t mean more pressure at the oil pressure sensor - it just means more volume bypassing and/or escaping back to the sump due to the clearance between the case and the oil pump which doesn’t change between a 26mm and a 30mm T1 pump - both will be undersize OD.

You’re on a good path to replace the relief valve with the Tangerine setup.

If that doesn’t do it - you’re right back to dealing with the shitty T1 pump situation.

[Chad911sc]

You are correct as usual!
At the time when I replaced the 26mm, the car had not left the build spot. It never ran more than 20mins sitting still, so it never even reached hot temps. I just noticed that the oil pressure would drop by quite a bit when it got warm. The pump had a pretty good leak from the gasket between the pump and the case, so I thought while I had it out, I would just put in a larger one due to the extra hose and cooler.
I guess I’ll find out in a week when I get the Tangerine part.