So I was just thinking, all the expense and weight of a dry sump setup. Its nice, and has a lot of advantages, but its complicated, can leak, and is heavy. Oh and expensive.
What if you just used the external dry sump pump? I know the biggest reason I want a dry sump is the OE oil pump isn't the most reliable piece at high rpms. So what if you used the oil pan sump as a storage area, and just used the external pump to scavenge and pump the oil. At that point an oil cooler would be easy to plumb and not have too much of a pressure loss.
This comes from helping my friend/boss run the lines on his dry sump setup. It has a huge 2-3?gallon tank behind the passenger seat, and the feed/return lines run between the driver and transmission tunnel (with a gaurd). It really adds a lot of weight, and there are a lot of failure points. The cooling and capacity is great, but it is a lot to consider.
Or maybe I'm just trying to simplify a proven setup. IDK, what do you think GRM?
~Alex
Sounds like they are using an Accusump?
Some advantages of a dry sump:
1) No worries about sucking air and losing oil to the bearings during high G situations.
2) Keeping the discharged oil away from contact with rotating parts reduces foaming and saves horsepower.
3) System oil capacity can be much greater, which keeps oil temps lower, takes advantage of 'oil cooling' of engine and parts (eg Porche 911 is 'oil cooled')
4) Scavenging oil directly from areas such as cylinder head eliminates issues with drainback, and accumulation of oil in those areas.
5) Dry sump swirl tank allows de-aeration of oil, capture of debris, and additional cooling.
A 'damp sump' system as you have described it only gives #1.
And that can probably be accomplished easier and cheaper with an Accusump.
Not saying you shouldn't.
I envisioned a 'damp sump' system where the pickup to the stock oil pump was plumbed into an external oil tank.
A single large scavenge pump would keep the stock sump nearly dry, discharging into a swirl at the top of the external tank.
Requires only a single scavenge pump, maybe COTS (see french fry oil pumps in McMaster, or 'cartridge style' as used on later model Lima blocks).
The Oil storage tank is still required, but number of lines, fittings, etc. is reduced.
Achieves some of the advantages of a true wet sump.
Carter
Billzilla built a dry sump system from two SBC oil pumps running off a common shaft. That was then driven off a belt from the crank pulley. I forget if it was a regular V belt or a cogged belt.
