2eighTZ4me Posted November 6, 2011 Share Posted November 6, 2011 (edited) Freshly built stroker turbo motor. I have a turbo oil pump and one of the Wolf Creek adjustable pressure springs. It's cranked nearly all the way in. I get ridiculous pressure when the car is cold. At 2500rpm - it'll spin the gauge to 100+ psi and peg it. Once the oil warms up, it drops to about 10psi per 1000rpm. I still believe in my gut this is a little low. Bearing clearances all checked out perfect. Running Mobil 1 10w30 synthetic. At the track today, after about 5 laps, it dropped to around 20-30psi at 5000rpm. Was able to run three laps on the next session once the car had cooled 40min, and then back to near nothing for pressure. 50 - 40 - 20psi per lap. I can't understand the massive fluctuations in pressure. My NA stroker makes about 40psi at 2000rpm. I have an Oberg oil filter. I cleaned it this evening and it was pretty plugged up on the small screen. Again - motor has maybe 200 miles on it. My "supposition" is that the filter clogged so hard that it hit the bypass valve and diverted the oil. I'm running my mechanical gauge in the stock sending unit position on the block. Not exactly sure where that comes in to the loop - so that's the ONLY thing I can think of - i.e. the oil that was bypassing the filter was also bypassing the gauge out of the block. I say this, as I also noticed my oil temp gauge was not reading squat, and it happens to be just downstream of the Oberg unit. Even with the filter clean, I still think my pressure is a bit low. Would a high volume pump (vs. high pressure) suit me better? But in the end - high volume does equate to higher pressure, so I'm not sure if any benefit would be derived from swapping. Can anyone confirm or deny my suppositions? I did beat up on a LOT of cars today. Video to come in the Car Talk section soon..... Edited November 6, 2011 by 2eighTZ4me Quote Link to comment Share on other sites More sharing options...
2eighTZ4me Posted November 7, 2011 Author Share Posted November 7, 2011 OK - upon viewing the video, oil temp was at 220 at the beginning of the run, had 50psi at 5K rpms. As the laps progressed, temps dropped considerably, as did pressure. I have to believe that oil was being diverted back into the block directly and bypassing the temp and pressure gauges. What I need to find out is where the pressure sending unit comes into play, and if I was bypassing the filter, would the pressure at the gauge fitting on the side of the block show a decrease? Knowing that I had decent pressure early on, leads me to believe that I had good pressure throughout the run even if it was being diverted through the bypass valve and perhaps missing the pressure gauge. I'll dig out the ol' FSM here in a sec and see if I can figure this out. Anyone want to chime in though - I'm all ears. Quote Link to comment Share on other sites More sharing options...
johnc Posted November 7, 2011 Share Posted November 7, 2011 Back off the adjustable oil pressure spring. You're probably bypassing all the time. Quote Link to comment Share on other sites More sharing options...
Noddle Posted November 7, 2011 Share Posted November 7, 2011 ..... Would a high volume pump (vs. high pressure) suit me better? But in the end - high volume does equate to higher pressure....... I disagree with this statement, if the "regulator value" has not been changed, you would not get higher pressure. Nigel Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.