oil delivery

[TorAtle]

(Also posted to the sevens list. Slightly edited)

 

http://www.se7ens.net/archive/sevens.w3archive/200001/msg00827.html

Peter C wrote a lengthy piece on the differences between apollo and dry

sump.

 

From what he writes I think you can make a drysump-ish system out of the wet

sump/apollo configuration like this:

* Vent the top of the apollo tank to air (atmospheric pressure).

* Install a 2nd oil pump in series with the bottom/output hose from the

apollo. A pressure relief valve returns oil to the top of the apollo tank.

 

Will the apollo tank be large enough? I dunno. Anyone know the capacity of

the dry sump tank?

 

One thing I'm unsure of is how you maintain the oil level in the apollo tank. During sure conditions the tank will empty, so I guess this means the 1st oil pump must pump more oil than the 2nd. So what to do when the tank is starting to fill up?

 

At the moment I'm just interested to hear if it will work (bored at work),

but at some point I'd like to get the oil-delivery issue solved. Even if I

bought the Caterham dry sump system at 1500 pounds I'd still have some

engineering to do as my alternator is where the 2nd pump is supposed to be.

 

Tor Atle

 

[Peter Carmichael]

I just re-read what I wrote back then.

 

My conclusion was that all this effort ended up with a dry sump system, poorly designed and using inappropriate individual components - a purpose-designed scavenge pump is better than using the existing pressure pump as a scavenge pump.

 

The cost of a dry sump system can be a lot less than the Caterham solution, but you just need to avoid using the bellhousing tank.

[TorAtle]

Any idea if the apollo tank can serve as both the tank and the conning tower?

[Peter Carmichael]

I think you are barking up the wrong tree.

 

The Apollo tank is only two litres. You need ~5 litres to make a good dry sump tank. A fabricated tank shouldn't cost very much and will have specific baffling plates to deaerate the oil and take-offs for venting to a catch tank.

 

I am thinking that a good chat to PACE about pumps and pump mountings might sort you out.

[TorAtle]

Hence my question about the tank capacity, now answered...