Dash Rendar Posted February 23, 2010 Share Posted February 23, 2010 Does anyone know how quickly the oil pressure should build when cranking up the engine on a cold start? What readings would you expect to see on an oil pressure gauge? Should it be up to pressure straight away, or does it take some time? Thanks. Quote Link to comment Share on other sites More sharing options...
SupraHuman Posted February 23, 2010 Share Posted February 23, 2010 Mine is about 4 when cranking then pops up to 7ish.. Quote Link to comment Share on other sites More sharing options...
T2 MSW Posted February 23, 2010 Share Posted February 23, 2010 Same as above, just under 4 when cranking and straigt up to between 7 and 8 when running. Quote Link to comment Share on other sites More sharing options...
Dash Rendar Posted February 24, 2010 Author Share Posted February 24, 2010 Thanks for those figures. Now I'm really confused though! The car fires up so quick, it's hard to see what the oil pressure is while cranking, but it looks to be around 3psi for the second or so that the gauge was stable before rapidly rising. Once the engine starts, the oil pressure rises up to around 90. It then gradually comes down as the oil temps increase. Once the oil is up to around 60 degrees, the oil pressure on idle has dropped to around 25psi. I've never considered this odd, because Matt Harwood and Mark (from Phoenix) fitted the gauge, and they both told me the high pressure on cold start was normal, and that it should come down (as it does) when it warms up. They set the low threshold at 15, which causes the gauge to alarm if the pressure drops below it. The oil pressure never drops below this level, unless it stalls. Ryan G has also checked the oil pressure gauge while mapping, and commented that the values were normal. But what I'm seeing seems totally different to what you guys are reporting for a cold idle! Quote Link to comment Share on other sites More sharing options...
Dash Rendar Posted February 26, 2010 Author Share Posted February 26, 2010 Don't suppose anyone can clear up that confusion for me? Quote Link to comment Share on other sites More sharing options...
SupraHuman Posted February 26, 2010 Share Posted February 26, 2010 Have you tried just cranking the engine and not starting it to see the crank pressure? Quote Link to comment Share on other sites More sharing options...
Dash Rendar Posted February 26, 2010 Author Share Posted February 26, 2010 Er, no. I'm not really sure how to go about that. But I'm also confused as to why my idle oil pressure is so different to what you said yours was (and M5W TT), yet why the likes of Ryan, Mark (Phoenix) and Matt Harwood thought it was okay. Oh, hang on... Is your gauge in bars? That would certainly account for the cold start difference, since my 95psi would be pretty much bang on 7 bars. Quote Link to comment Share on other sites More sharing options...
SupraHuman Posted February 26, 2010 Share Posted February 26, 2010 My gauge is in bar indeed Quote Link to comment Share on other sites More sharing options...
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