Dry sumping a Rotary?
Originally posted by chairchild
The oil will heat up quicker than the water will -if anything, it'll cool it down more during startup (BAAD!!)
The oil will heat up quicker than the water will -if anything, it'll cool it down more during startup (BAAD!!)

But what flow-rates are needed for a 12a?
so @ 10000rpm that would be like 12 gpm
so a 25gpm @ 10000rpm scavanging pump should be about right, yes ?
what are you using for an oil tank ?
are you using the stock oil filter ?
as much of what you have learned would be wonderful.
specs on your sump cover ?
{that $700 oil pump shoots your setup down for me, I MUST find a cheaper way or give up on the idea.
}
are you using the stock oil filter ?
as much of what you have learned would be wonderful.
specs on your sump cover ?
{that $700 oil pump shoots your setup down for me, I MUST find a cheaper way or give up on the idea.
}
Oil Tank: 6 quart dry sump tank
Oil filtration: I use 2 one in line after the scavenge, and the stock. There are many theories into where you put the filter on these sort of systems. I've gone belt and braces for now.
As to a cheaper solution it very much depends what you are trying to achieve. Certainly the external scavenge and stock pressure pump system has been proven on many engines and I don't see a good reason why it wouldn't work on a 13B. But likewise the accusump is also a way of doing it.
One thing I haven't looked into is the potential flow increase by putting the cooler in the scavenge line so freeing up the stock pump to give more flow into the engine. And before anyone asks I am well aware that there is also considerable debate as to whether it is better to put the cooler in the low or high pressure side.
Bill
Oil filtration: I use 2 one in line after the scavenge, and the stock. There are many theories into where you put the filter on these sort of systems. I've gone belt and braces for now.
As to a cheaper solution it very much depends what you are trying to achieve. Certainly the external scavenge and stock pressure pump system has been proven on many engines and I don't see a good reason why it wouldn't work on a 13B. But likewise the accusump is also a way of doing it.
One thing I haven't looked into is the potential flow increase by putting the cooler in the scavenge line so freeing up the stock pump to give more flow into the engine. And before anyone asks I am well aware that there is also considerable debate as to whether it is better to put the cooler in the low or high pressure side.
Bill
personally I am after ground clearance, trimming the sump to 1" deep will help me a LOT.
what is that wire coming out of the left suction bay in the picture ?
on putting the cooler in the scavenge line, as I understand the way it works the scavenge line does not have a solid stream of pure oil flowing through it, rather it has foam and slugs of air.
this would reduce the effectiveness of the cooler dramatically, eh ?
I think a stage of the pump drawing on the tank, looping through a cooler, and dumping back into the tank at the pressure suction would probably work better and more consistantly.
what is that wire coming out of the left suction bay in the picture ?
on putting the cooler in the scavenge line, as I understand the way it works the scavenge line does not have a solid stream of pure oil flowing through it, rather it has foam and slugs of air.
this would reduce the effectiveness of the cooler dramatically, eh ?
I think a stage of the pump drawing on the tank, looping through a cooler, and dumping back into the tank at the pressure suction would probably work better and more consistantly.
Which one? The white bundle is the temporary igntion wiring until I get the MS rotary ignition code working (had to move coils to get pump to fit in westfield.)
Putting the cooler in the scavenge line does reduce cooling performance. Putting it in the pressure line increases the chance of leaks and reduces the flow capacity of the pump. However in the defence of suction side cooling, a correctly designed oil cooler will de-aerate the oil to a degree. Having the filter where I have it also helps.
Your proposal is interesting, but has never, to my knowledge been done. At the end of the day its all down to the set of compromises you make. If once I'm running my oil temps get to high I can always reroute the cooler or add another one
Bill
Bill
Putting the cooler in the scavenge line does reduce cooling performance. Putting it in the pressure line increases the chance of leaks and reduces the flow capacity of the pump. However in the defence of suction side cooling, a correctly designed oil cooler will de-aerate the oil to a degree. Having the filter where I have it also helps.
Your proposal is interesting, but has never, to my knowledge been done. At the end of the day its all down to the set of compromises you make. If once I'm running my oil temps get to high I can always reroute the cooler or add another one
Bill
Bill
just hanging there ?
heh, it looked like there was a fitting attaching it to the sump plate, I even fancied I saw a setscrew, to secure it in place
it DID look like a silly place for a temperature probe, and even sillier for a pressure probe.
heh, it looked like there was a fitting attaching it to the sump plate, I even fancied I saw a setscrew, to secure it in place
it DID look like a silly place for a temperature probe, and even sillier for a pressure probe.
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