Renault Power Unit Hardware & Software

[uniflow]

So perhaps an HCCI system that can raise the compression to 20 to 1 and run on petrol and control combustion point could be useful then?

[uniflow]

Are the F1 cars placing the combustion chamber under the exhaust valves and using load/pressure (heat) to intiate HCCI? Hot exhaust valve ignition using squish to help control point of ignition?

[Tommy Cookers]

Compression ignition with burn rate limited by controlled fuel admission (diesel cycle) does not produce greater thermal efficiency, in fact the opposite is true - Otto cycle is more efficient than Diesel for a given CR. The higher CR possible with controlled-rate combustion is one part of the diesel's efficiency advantage. .........

afaik .......
road 'diesel' vehicles always had and still have high-speed CI engines
(not slow speed CI engines, the cycle that was patented by Dr Diesel, this adds its heat at constant pressure)
the high-speed CI so-called 'diesel' adds some heat at constant volume and some at constant pressure, so its cycle is known as the mixed cycle
mixed-cycle CI seems now to have equalled Diesel CI in efficiency (in larger high-speed CI engines and in medium-speed CI anyway) ?
despite its CR not being as high

in slow-speed CI (eg 50 rpm) combustion delay is an insignificant part of the time window and fuel rate gives perfect/full control of combustion rate
to enable higher rpm CI engines a different treatment may be/have been necessary, but appears to allow compensatory benefits ?
though these may be partially forgone by lowering CR again to lower peak cycle temperature and so lower NOx production

[carisi2k]

I think EGR option is very limited because there is no variable valve timing or valve lift allowed.

Anyway this last race I saw a Renault Engine powered car overtake a Williams. Renault is definitely over 900hp now. Cannot be denied anymore. I am looking forward to the upgrade for sure.

This was assisted by DRS, Tyre performance and in the case of Hamilton a severely damaged car. From what I have read, the off season performance upgrade for Renault was 50hp which might put Renault at about exactly 900 horses. But it seems that both Mercedes and Ferrari have about 950- 960hp given that Renault think there 30hp Canada update will halve this number.

In any case for whatever reason that Renault failed last year, they seemed to have learned their problems and atleast in the RB12 a car is quick with there engine inside.

[ReoPTy]

960hp? nope !

would renault get 890hp , ferrari around 920 and merc around 930hp at best , around 4% delta !

don't know if power added could halve the delta, in china it was 0.5s Q3 and 0.2 race, 35hp + hcci is 0.5s

[carisi2k]

960hp? nope !

would renault get 890hp , ferrari around 920 and merc around 930hp at best , around 4% delta !

don't know if power added could halve the delta, in china it was 0.5s Q3 and 0.2 race, 35hp + hcci is 0.5s

930hp was last years numbers for Mercedes. So far in 2016 it is 960hp and maybe more in Qualifying.

2016 Ferrari is probably close to 960HP but with the reliability issues they have probably only been able to get about 945hp so far. 2015 Ferrari engine is about 910-915hp and this shows up on most of the speed traps where the Torro Rosso's are faster then Red Bulls by about 3km/h.

This ties in nicely with the Renault having about 900HP. They have fixed the reliability issues from last year and found at least 50HP with the current engine. Canada spec is supposedly about an extra 30hp which they believe will halve their deficit to Mercedes which is where my figure of 960hp for Mercedes is coming from.

Honda has about 880HP and are at the bottom of the speed charts but at least they are able to use the 880hp during the lap. They also have an engine upgrade for Canada but no info is available as to how much extra performance is provided with this update as of yet.

[ReoPTy]

so mercedes ICE is 800 hp? at 100kg ahour feed flow?

gives 'em a nobel price!

speculating fanboyos and real numbers are different ! and a gap of 0.5s Q3 is rated around 40hp,
as is it speculed here

http://parsherald.com/red-bull-ready-ch ... ines/5468/

renault could close the gap over this year!

[Zynerji]

Has there been any definitive news about the tech to be introduced at the Barcelona test?

[NL_Fer]

Will Redbull run the engine also?

[Zynerji]

Will Redbull run the engine also?

With the teams only allowed one car at test sessions, I would expect Red Bull would be begging for the upgrade to test to gather the most data possible, and maybe even have some influence on the performance mapping to help balance their car with the changes...

[Blackout]

Motorsport says both teams will test the engine.

[ME4ME]

For the sake of Renault, Red Bull and F1, it better be good.

Hopefully the test goes so well that they'll be able to introduce the new engine at Monaco.

[lio007]

As Renault used 1 token in Russia, does anybody know what kind of update this token was?

Edit: Renault did a filming day recently. Maybe this was a pre-test of the B-spec PU before BCN's test.
(just speculation)

[lio007]

http://www.motorsport-magazin.com/forme ... es-killer/

http://www.motorsport.com/f1/news/renau ... 36876/?s=1


Some interesting facts about the update from Renault's Taffin:
- they are not gonna introduce any prechamber ignition on the canada-update nor in the near future (because it complicates CFD-analysis in the chamber)
- they'll have an updated chamber
- a new 2015-Brazil-spec based cylinder head
- the update is only on the chamber / ice, no external parts
- the update costs 6-8 token (they are still in discussion with FIA)

[PlatinumZealot]

That Total fuel must be crafted really well if they can run mixtures nearly as lean as Mercedes with only cylinder head upgrade without the TJI.