henry wrote: ↑
Fri Nov 08, 2019 6:02 pm
saviour stivala wrote: ↑
Fri Nov 08, 2019 2:12 pm
henry wrote: ↑
Fri Nov 08, 2019 10:32 am
In the 2021 regulations there is a schematic of the fuel system, §6.6.1.
The sequence is lift pump > collector pot > primer pump > fuel flow sensor. It is the primer pump that would generate any pulses.
So pressure in the collector is not the issue, constant or otherwise.
I cannot comment on what is going to be used in 2021 as I am not privy to the information you posted. These on here conversations/discussions are about the system that is being used at present, A system that have been used from at least the NA 2.4L V8 era, where the 'collector-pot (looks like a soda bottle upside down) is pressurized with fuel (low pressure) by the lift pumps, this low pressure fuel passes through the fuel sensor/meter on its way to the mechanical high pressure pump intake normally driven by an inlet camshaft. this system have no 'primer pump' between collector-pot and fuel flow sensor/meter so there is no pulses through the fuel flow sensor/meter. It is interesting to know that according to you in 2021 by the addition of a 'primer pump' into the system,in between the collector-pot and the fuel flow sensor/meter there is going to be generated pulses through the fuel flow sensor/meter.
The 2021 regs are here https://www.fia.com/file/105636/download/29731
At a cursory look the PU specs have changed little, but one of the additions is the fuel system schematic. This diagram is necessary because it identifies pipework which is also now prescribed in the 2021 regulations.
My supposition is that this simply brings into the regs controls that are currently identified in TDs.
Can I ask why you think the system is currently as you describe?
I searched on the web for a diagram or at least some useful specifics of the current fuel system in F1, but haven't found anything so far. The only piece of information that might be worth mentioning is the recent FIA invitation to tender for standard fuel system for 2021. The vague impression I got from the wording of it is that the intention was to standardize the system that is currently used, and therefore the diagram in the TRs of 2021 could be representative of the current system too.
The official text of the invitation is no longer available on the FIA legal webpages. Here follows an extract of it (I think I took it from motorsport.com, but it is also on several other sites).
“The aim of single source supply is to retain current levels of Formula One fuel system performance for all cars at a reduced cost for the competitors whilst also removing the requirement for competitors to design or source their own fuel system components.”
“The components can be carried over between seasons, which removes the need for costly continuous performance development”.
“Fuel flow limitation enforcement is key to the fairness of the competition, and common fuel system components shall contribute to a fair regulation of the competition by the FIA.”