2025/2026 Hybrid Powerunit speculation

[johnnycesup]

No no no.

The previous rule set is 100kg per hour of fuel flow maximum. (Or about 4350 MJ per hour of energy flow or 1620hp of fuel power) The previous power units made 1050hp or so with ICE plus Electric motor. 840hp plus 160hp.

The previous engines thermal efficiency is 840hp/1620hp. Or about 52% to 55%

These new engines will be stripped of two major efficiency boosters... The MGUH (heat recovery turbine) and 18:1 compression ratio down to 16:1. Their efficiency WILL GO DOWN. No matter how you slice it even without doing the numbers.


Now...
MGUK is now 350KW. Or 470hp.
This leaves 530hp for the ICE if the 1000hp rumour is true. (I doubt it based on reports).
Total fuel input power is 3000MJ/hr or 1,117hp
Efficiency is 530hp / 1117hp = 47%

So you see now? Thermal efficiency will be lower.

I think the real figure will be lower.

Look, we are talking past each other. FW17 said that 470kW for the ICE in the 2026 regs would mean over 56% efficiency, which is true even in your calculations (just divide 470 kW = 630hp per 1117 hp).

Now I'm not saying that they will produce 470kW, I even said in the initial post that 56% was high ("A bit optimistic IMO"). Anything close to 400kW (48% efficiency) should be considered a major success IMO. And of course I know that the ICE only needs around 400kW for the whole system to have 1000hp peak power, not 470kW.

I mentioned the 1000hp thing to calculate the efficiency of the 2014-2025 engines (with MGUH), not 2026 ones.

We are not disagreeing at all.

[wuzak]

Tombazis said a while ago that the peak would be about 1,100hp, which would mean 470kW.

Renault said they had passed the initial power goal for the PU, which would have been about 400kW.

Before they abandoned the project, of course.