Belgian1979 wrote:I would like to know more about dry sump systems and although a lot of things are already on the net I haven't found a suitable answer for the following questions :
- what is the chance of a belt being thrown off ? I already had the accessory drive belts being thrown off, so this is at least something I would want to know about.
- With the tank being above the level of the oil pump, doesn't the dry sump tank drain it's oil to the pan when not in use ? How do you deal with that.
- Is it required to prepressurize a dry sump pump with an electric drill or is this because the pan needs to be emptied of the oil that drained into it.
Cubic_Cleveland wrote:Belgian, I think the answers to your oil system issues are easier to find than engineering a dry sump system, and a LOT cheaper. Either way the pan has to come off and the oil pump come out so why not see what you can find first?
Aside from that I am a dry sump fan, but you have to be careful about trash getting into your belt system. Some sort of belt cover, or an enclosed/protected engine bay go along way to prolonging belt service life. It's not pretty when a belt lets go at RPM.
Belgian1979 wrote:Bit of topic here but FWIW : I've been talking to several people about the oil pump issues. So far most are leaning towards the bypass being the culprit. The best answer so far came from Schumann pumps. I asked them what they suggested and basically they suggested a pump which bypasses to the sump instead of to the inlet. Their reasoning is that in a high bypass situation such as in high rpm, the bypass oil stream in the inlet backs up towards the pickup in essence restricting the inlet, inducing cavitation, which ends in a sort of oscillation at the bypass valve.
Belgian1979 wrote:I've had other people that said basically the same thing when they analyzed the pump graph. Canton was not able to help me, other than they said that none of the billet pumps (which are very expensive) fit the pan without reconfiguring the rear wall. The billet pumps are better in that they have more inlet area.
The pump I use now in essence has a capacity to produce around 50 gpm at 6000 rpm. The volume of oil it produces certainly is not the problem.
Belgian1979 wrote:I made a pressure drop calculation and if these calculations are correct, and the limit of 3-4psi is correct, I should still be ok with a pressure drop of around 2,4 psi at 6000. It's close but it might work. I'm inclined to try the external bypass first, maybe even combined with a metered hole in order not to put the internal bypass out of order entirely. If it doesn't work out, it will probably end up with a dry sump.
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