Whats the logic for when you need to dry sump a car thats a dedicated track day car?

Is it based on the engine, the car (and or the engine) or the type of G's your pulling through the corners via slicks etc

cheers
sean

 

It's for a couple of reasons I believe.

It's mainly because of the oil going to one side of the sump on hard cornering but baffled sumps can sort of stop this and for more power because the crank doesn't have to cut through the oil.

That's how I see it

Paul

 

and you can have the engine lower for better C of G due to the smaller sump

 

That's also true. A mate races in some club 750 thingie and his engine looks tiny because it's so low It's only a 1300cc crossflow but I've seen bigger lawmower engines

 

I understand there are options to combat it, but im more interested on what basis you need to do something...

The options i'm aware of are:

Baffled Sump - a kit doesnt exist for my pug 16v
Dry Sump - I can get a PACE system for about 1k
Apollo Tank / Accusump - someone's looking into these for pugs

 

There are three main reasons for dry sumping a competition engine:

1- As stated above, it reduces the chance of pressure loss due to oil surge during hard cornering, and in the case of rally cars hard jumps & landings.

2- It massively decreases the amount of drag/impact stresses on the crank & rod assembly, as there is no longer a huge turbulent fluid surface for the crank to have to hit & cut through, this in turn means you can have a lighter crank assembly, which you can then rev harder. If regs preclude dry sumping, a windage tray is fitted to try to keep the fluid surface from affecting the crank.

3- As Bob T says you get to lower the engine in your chassis, in fact prodrive got the engine so low in the final mondeo touring cars that the offside drive shaft ran through the valley of the V6 with the inlet trumpets running either side of it This is not such a major reason in a rally car though, as you have to avoid the crank hitting the ground on hard landings

 

Can't you get one made? I asume the sump's alloy? Get someone to weld baffles in Sorted!

 

Ive done that for scoob sumps..



David

 

Done what? Dry Sumped it or Baffled it?

 

baffled

 

I'm easily baffled

 

There's a suprise........................................... ...........NOT