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Would you feel comfortable racing it with the pressure described above?

  • Yes

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  • No

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Discussion Starter · #1 · (Edited)
this car only races, doesn’t get driven on the streets

K24a2 tsx block, k20a2 head, DC 3.2 cams w/Supertech head package

Oil: Valvoline VR1 20w50

Fuel: X85

It is a fresh build and on a cold start it’ll idle around 30-40 psi (have AEM Xseries gauge) but after running it, and getting it warmed up, the pressure drops to 15-20psi when idling at 1,000rpm. When I get back on the throttle it rises back up to normal 70-80psi (ish). Any guesses? Normal? Suggestions?
Thanks and Happy Thanksgiving everyone.
 

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Idle pressure is on the low end, especially for a 20w50 oil. but i wouldn't be concerned about that on its own.

The real question is why is it low? Worn oil pump? Excessive bearing clearances? Inaccurate pressure Gauge?

If it's built with large bearing clearances then id just stick with the 20w50 and send it.
 

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Discussion Starter · #7 ·
Idle pressure is on the low end, especially for a 20w50 oil. but i wouldn't be concerned about that on its own.

The real question is why is it low? Worn oil pump? Excessive bearing clearances? Inaccurate pressure Gauge?

If it's built with large bearing clearances then id just stick with the 20w50 and send it.
brand new type S oil pump, brand new AEM Xseries gauge and sensor. Not sure about the bearing clearance. Going to go run it tomorrow tonight and see what happens
 

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Check the sensors behind the head or filter in the front.. might wanna get the seal in the back of the head incase it tears.. but try cleaning that one first.. if not ur gonna need to took down cam bolts better or resurface the head on the top and oil pump resurfacingat machine shop..they can repair them .. if all fails on ur build.. but I would go there because u can check rod bearings when oil pump is dropped..
 

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...on a true cold start it will idle fine (60-70ish) and one it gets warmed up it’ll idle 30-40 psi
I see no issue with these values. Mine has a 5W30, cold idle = 2.5 bar, 88 °C idle = 1.3 bar, 9000 rpm and 88 °C is 3.2 bar. The engine is fine with it. No single wear indications up to know after 35 h tuning and analysis operation, which is really hard. The bearing clearances are on the higher end of the 5W30 specification. Oil flow is more important then a high oil pressure only. If you know it flows well, lower pressures are acceptable.
 
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