Oil Level Dyno Testing (2023 - Episode 50)
HTML-код
- Опубликовано: 12 сен 2024
- Lakes Speed Jr heads back to EFI University to see Ben Strader and talk oil - specifically the four “R”s of oil: the Right Oil, the Right Place, the Right Time, and, the Right Amount.
But if you’ve figured out the oil and where and when it needs to be, how do you know what the “Right Amount” is?
To answer the question, the guys load the Expo LS engine on the dyno and run some tests to see what the right amount is, and what the effect of too much or too little is on horsepower production. (The results might surprise you.)
@EFIUniversity1
Lake is cool ! Cheers from New Zealand 🇳🇿
thanks for the video guys
Our pleasure!
My guess is that (at the lower oil volume where pressure dropped) that a portion of the power gain came from the oil pump's reduced load and from the decreased crankcase windage. When the oil volume was increased above the recommended level the pump pressure was no longer adding or subtracting power, but the crankcase windage loads increased and a more subtle power drag may have come into play in the form of oil aeration allowing some increased friction (maybe not during the very short dyno run though, but likely with extended high rpm it would have). The other thing to try would be reducing and then increasing oil viscosity to see if oil pump pressure load and windage loads could be lessened even more, as long as viscosity remains in the safe acceptable range for this engine's bearing clearances.
It would be nice to know for a fact exactly how much oil pressure is needed to maintain the oil wedge at all RPM. I believe Smokey Yunick said a good rule of thumb is to have 10 psi for every 1,000 RPM up until around 75 psi. I would like to see this put to the test. I have a feeling that once you have about 45-50 psi, that it would maintain the wedge even above 5,000 RPM. Until we actually know for sure, we will err on the safe side and shoot for high pressure and above minimum oil volume and live with the power loss as a safe trade-off.
This test was done on engine masters a few years ago, showing how oil levels and windage kill power
J😊😮🎉e😮🎉😊 9:50 😊😊u
So in a non-OE engine build how do you determine the "proper" amount of oil to use? And is there a way to determine this without specifically testing various quantities on a dyno?
You can measure the depth of the stroke of the crank and rod assembly from the pan rails and the then mark that depth on the inside of the oil pan (but add 1/2 inch) You can then fill the oil pan to that mark and record the volume of oil required to reach that mark.
@@EnginePerformanceExpo So are you saying go 1/2 an inch closer to the pan rails or further away?
@@EnginePerformanceExpo Thanks for the reply! Do you add the 1/2 inch to move the oil level "up" so that you're increasing capacity or "down" so that you're giving extra clearance for the crank/rods and reducing the oil level?
1/2 inch deeper to provide room for the oil to expand as it heats up (and still have clearance).
@@EnginePerformanceExpo Great, thanks for the clarification.
I would observe wear difference, oil pressure might look good/better but I'm guessing air bubbles are bursting left & right in critical areas. 😄
too much oil in pan can hurt engine by aerating the oil.
Absolutely!
Does the engine have a windage tray?
Nope. It’s a NASCAR spec engine road race pan.
Not very useful or enlightening. Should have mentioned at what volume there is rotating assembly interference and even more important should have tried a lesser viscosity oil. And you guys gotta be kidding if you think (oil) pumping losses don't have anything to do with the numbers! Gain 60Hp with dry sump...would have to be a combination of factors if that happened. More than was observed here.