Installing This Has No Drawbacks, Except for Your Wallet - Dry Sumps Are Awesome, Here's Why...
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So how does a dry sump system achieve vacuum in a crankcase? By sucking everything out.
So instead of a traditional wet sump that stores all the engine oil….we are going to have a very shallow sump or oil pan and then instead of an internal oil pump we will have a belt-driven pump hooked up to the crankshaft pulley. So the pump runs whenever the engine runs and pump speed and pressure increase as engine rpm increases ,just like a conventional oil pump. This external pump scavenges or sucks oil out at multiple spots in the shallow oil pan and sends it into an external oil reservoir. At the same time, it takes oil from that reservoir, pressurizes it and feeds it back into the engine. These are called pump stages. The first one will almost always be pressurisation and the remaining ones will be scavenging or suction. The more stages we have the higher the vacuum we can create.
Ok….this looks like a lot of additional parts, hoses and complexity just to achieve crankcase vacuum? Is it worth it? Yes it is….because crankcase vacuum is just one of the many benefits that a dry sump achieves.
The next important benefit is that a dry sump makes the life of the crankshaft much easier. In a conventional wet sump system the oil drains from the rotating assembly down into the sump through the force of gravity. As the oil falls down it of course passes by the rapidly rotating crankshaft, which then acts like a blender and creates a chaotic tornado of air and oil. So the counterweight edges travelling at 200km/h have to push through this environment of air and oil droplets all the time. This of course, is another power-reducing loss. But a dry sump system does. In a dry sump system the oil does not stream down from the rotating assembly via gravity….it is actively sucked out of the engine. In other words it doesn’t spend enough time and it’s not present in a sufficient quantity in order to be churned up into a froth by the crankshaft and because we create a vacuum inside the crankcase, the crankshaft doesn’t even have to fight any air resistance.
But this is still just the beginning of the benefits of a dry sump system Another very important thing it achieves is that it makes the engine run cooler. An example, of engine temperature control using the increased capacity provided by a dry sump system are classic air-cooled Porsches. There we had air-cooled flat-six engines with a displacement of 2 to 3.8 liters at the back of the car. To ensure they didn’t overheat they had oil capacities of 9-14 liters. The more oil we have the harder it is to overheat it. Since it has a remote reservoir a dry sump system makes it possible to carry vritually any amount of oil.
We are still not done with the benefits. Something else that the dry sump system can do is to increase your redline. One more major benefit. A lower center of gravity. This one is pretty straightforward. If you get rid of the tall we sump and install a shallow pan then you can easily mount your engine lower which of course leads to a lower center of gravity and improved handling.
Ok, so many many benefits. What are the drawbacks? To be honest, none. Other than added cost and complexity.
Ok so it’s basically all benefits. Why are dry sumps pretty rare, then? On cars you will find dry sumps from the factory only on stuff like Ferraris, Some Z06 corvettes, GT3 Porsches, Lexus LFA, The V10 BMW M5, certain V10 Audi R8s and so on….basically cars of that caliber….and the reason is that regular cars simply don’t see the g-forces needed for a dry sump and the increase in cost simply doesn’t justify the increase in power or improved handling from a lower center of gravity. Most normal cars also simply aren’t developed with prolonged high rpm abuse or racing in mind and will spend their intended life perfectly fine with a conventional wet sump. Dry sumps are a lot more common on motorcycles, especially on high-revving sport bikes and dirt bikes. In sport bikes we have extremely high rpm and lean angles that justify a dry sump whereas on dirt bikes we may have jumps, tough landings, aggressive climbs, wheelies as well as acrobatic maneuvers that can justify a dry sump system.
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#d4a #drysump #enginebootcamp
00:00 We want vacuum
01:17 Blowby and PCV limits
03:20 Reduced Crankcase Pumping Losses
04:51 The Parts
06:15 Reduced Windage Losses
08:11 Improved Ring Seal
10:02 Temperature Control
12:47 Engine Protection
14:34 Higher Redline
16:38 Lower Center of gravity
17:03 Drawbacks? Receive SMS online on sms24.me
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