Ferrari F10 - angled engine mounting

[Shrek]

i was reading on this website that Ferrari has a new engine mounting to feed the diffuser more air how exactly does it work?
http://www.auto123.com/en/racing-news/f ... tid=115805

[manchild]

That has more to do with fuel tank COG and underbody aero than with engine breathing.

Back of the chassis isn't 90 degrees but with 3.5 dgr. agle, so the engine rises towards rear end.

[xpensive]

Aha, just like Tony Southgate's 1979 Arrows then? Ghastly looking vehicle though.

[sticky667]

i think it was scarbs who posted about it being mounted slightly tilted in order to feed the diffuser more efficiently.

[WhiteBlue]

I don't think so. Link
I read it first at German site http://www.motorsport-total.com

[Giblet]

The Arrows, due the angled engine, had extreme "porpoising" at speed, that never got resolved, but it was also a pure ground effect car.

[RacingManiac]

Didn't Porsche used to do this on 956/962s?

[bill shoe]

A 3.5 degree installation angle on a 20-inch long engine means the rear end of the engine is a little more than one inch above the bottom of the car (~ 30 mm). This raises the engine CG 15 mm. The engine by rule must weigh 100 kg, and the car weighs, what 650 kg?, so this raises the overall car CG by around 2 mm.

There is a 50 mm difference between the main/bottom reference plane and the "step" plane on the underside of the sidepods. I could understand slant mounting the engine if it went up ~ 50 mm so you could better duct air into the infamous "slots" between the planes that feed the upper deck of the double diffuser, but I don't understand how a gap of 25 mm helps feed the upper deck of the diffuser better. Must be something that comes out in a 3-D view.

[manchild]

his raises the engine CG 15 mm. The engine by rule must weigh 100 kg, and the car weighs, what 650 kg?, so this raises the overall car CG by around 2 mm.

If I'm not mistaken, there are two separate rules dealing with engine - minimal weight and minimal COG.

It's not the same if you add weight on engine in order to increase COG to fit regs. or if you reduce engine weight and while maintaining COG by raising the engine, and gaining on fuel tank space, overall COG and aero.

[xpensive]

If the height of engine CoG is set relevant to the "reference plane", engine's position per se shouldn't matter,
Ferrari could build an engine with very low CoG and mount it higher, right?

5.4.2 The centre of gravity of the engine may not lie less than 165mm above the reference plane.

[bill shoe]

If the height of engine CoG is set relevant to the "reference plane", engine's position per se shouldn't matter,
Ferrari could build an engine with very low CoG and mount it higher, right?

5.4.2 The centre of gravity of the engine may not lie less than 165mm above the reference plane.

Good catch xpensive!!

Poorly written rules, but what's done is done. Given the engine freeze they can't do much. I think the rules do allow a small amount of ballast on the engine to exactly hit 100 kg. Ferrari can lower the location of the small amount of ballast to get the CG back down relative to the newly distant reference plane. No CG penalty!!

[Del Boy]

The crankshaft height is set in the engine rules.

[marcush.]

if you slant the engine and keep the bottom of the drysump flat on the floortop,you could carve a wedge shaped tunnel into the sump +if you do the sump in heavy material the CG height meight end where it was before ...as there seems no problem of achieving the min weight and cg height of the lump today I assume
the drawback of having the engine tilted a bit is not as big as the geometry would make you believe.

a carved out wedge sump of course is the reason why you could do this.

[xpensive]

The crankshaft height is set in the engine rules.

This is perhaps what you are referring to?

5.3.3 The crankshaft centreline must not be less than 58mm above the reference plane.

Ferrari can have their engine upside-down if they want to, hope the do actually.

[marcush.]

The crankshaft height is set in the engine rules.

This is perhaps what you are referring to?

5.3.3 The crankshaft centreline must not be less than 58mm above the reference plane.

Ferrari can have their engine upside-down if they want to, hope the do actually.

does this sentence not imply :the centreline of the engine crankshaft has to be paralell to the reference plane??? centreline of crank does not give a starting or end point from where to take measurements,so an angled centreline does indeed
cross the reference plane somewhere...