"3/10th is what we have been told, so a huge amount IMO for a motor that was said to be very equal "
This may sound like a big advantage in lap time but it is only an advantage if everything else is equal. Take two drivers of equal ability on identical chassis/set-up, same tyro pressures etc.
In theory, the driver with the better motor should gain 3 seconds over a 10 lap race.
In real life you are going to have drivers deciding on different sprockets, tyre pressures etc. Some may be able to replace their chassis every few races, others may have the chassis checked after every race
Imagine your local club had a system of pressure pads built into the track on the perfect racing line (or two sets to allow for a wet line). There is then a screen that shows a green light when the kart is on the racing line and a red light whenever it is off the line.
Now, if you believe that your driver could do 10 or 20 laps keeping the light mostly green then you may well want the engine with the 3/10 advantage. If your driver is likely to be mainly on red lights then the engine would not make up the difference.
It would be fantastic if an engine manufacturer could produce exactly equal engines but I doubt in even Mercedes can do that for their own F1 cars, let alone for the other teams they supply and I bet you would get a lot of kart engines for the price of an F1 engine.
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