Oil pressure

[Edmundas]

Hello,
I have just rebuilded my engine and the oil pressure at hot idle is 0.3 kg/cm2
and at 3000rpm it is about 2.3kg/cm2.
Will oil pressure this low wouldn`t do damage to the engine?

 

[gottadiesel]

From what I have read on this forum, that is not abnormal at all, a couple of factors are weight of oil being used and is that with a stock gauge, notorious for reading low, but I do not think those readings are low, they are higher than mine, but I run 5w20 oil.

There is a link on here somewhere to a 6 page essay from an oil engineer that really makes it clear as to weights of oil and their performance benefits and downfalls.

Just remember this - Flow it more important than pressure, of course must have some pressure otherwise would point to a major issue, but IMO it would not take long for something to start knocking if pressure was way too low...

 

[gottadiesel]

Oh by the way for others in my neck of the world - that is 4.3 psi ilde and 32.7 psi at 3k

 

[Failure14]

Yea "Jdub", Read this stuff right here, i know your probably
thinking like jeesh thats alot to read but its definetly worth it
and i guarentee you learn alot.

http://www.supramania.com/aehaas/

 

[Supracentral]

Most mechanics who are familiar with (for example) GM motors will tell you she's gonna blow when you've got 5 psi of oil pressure at idle.

Believe it or not 4.3 psi (0.3 kg/cm2) or higher is the factory spec for this motor at idle.

It's normal.

 

[radiod]

Factory spec on the pressure is >30psi @ 3000rpm, so from what I see you're fine. And like Supracentral already pointed out, your idle pressure is fine as well.

0.3kg/cm2 = 4.3psi
2.3kg/cm2 = 32.7psi

Calculator:
http://www.onlineconversion.com/pressure.htm

 

[gottadiesel]

Thanks Failure14 for listing link, I knew I had seen it before... I thought it was well written to help those looking for a good explanation of oil properties and what you need to know... I know after reading it, I run lighter oil than I used to depending on time of year

Radiod - Thanks for that conversion link also, I guess I should have listed it... same one I used, as I had no clue until I converted as to what his oil pressure really was...