Maybe a stupid idea but all these evap issues wouldnt exist if gas tanks were air-tight bags (inside a metal tank) that expand/shrink with the gasoline. Why is that not a thing? Maybe too hard to maintainIt prevents the gas tank from pressurizing and rupturing. it also reuses the gas fumes, instead of them going out into the environment if you're silly enough to vent it to atmosphere.
I used to design instrumentation for tank farms. PRV's were part of my scope. There was so much to take into account. Especially if venting through a vapor recovery unit or a flare, using blanket gasses etc... In the case of the engine, gasoline has a range of RVP's. Somewhere around 9PSI. So depending on how fast you pump down there could be some negative pressure. On the positive side 9PSI over atmospheric is a lot of pressure over that area too. In essence if you completely plugged the tank you would expect it to develop around 9PSI give or take positive pressure over atmosphere. Over the surface area of the tank a few PSI could be a LOT of force. You would hope the pump would experience cavitation and destroy the impeller or stall the engine due to low fuel pressure before the tank collapsed. Or the gasoline may just boil to maintain the pressure if your rate is low enough. I'm not keen to try it and I don't suggest anyone mess with their evap unless installing a fuel cell with dedicated bladder and / or breather designed for the race track with an inversion (roll over) cutoff.It is amazing what a few psi can do, negative pressure included. Which happens first, a collapsed tank to stalled engine? Maybe even a fried fuel pump?
I am Starbucks testing the cup holder over this week. It is a racing bike bottle holder. Seems to be doing the job! Available all over eBay and sold with the weight as the primary feature. The only drawback is that there is a little lip at the top that requires trimming to work with normal cups.Where did you get that cup holder? I might want it
If I’m not mistaken the McLaren F1 has this type of fuel tank, and yes, it needs to be replaced every ~8 years or so.Maybe a stupid idea but all these evap issues wouldnt exist if gas tanks were air-tight bags (inside a metal tank) that expand/shrink with the gasoline. Why is that not a thing? Maybe too hard to maintain
Chapeau.More weight reduction starting. RPF1
Yeah, stocker seats with leather are somewhere around 38 lbs each. I just sent off an inquiry to Eltech. My Italian is crap but a single skin seat from them is shocking light. However I can't tell if the weight they advertise is with or without pads. So I can't say 100% what the delta will be. I was really interested in the Tillet B5 but they are 10 lbs vs 5 lbs for the Eltech and lack FIA and homologation ratings. Plus they cost like 50% more. Too bad because I prefer their more subtle style and the Tillet appears to seat the driver about 1” (or more) lower. I have also heard that they are super comfortable for those who are of narrow girth.Thanks for the mirror specs. Node. Alas too rich for me with shipping and import.
Same issue as with lighter bonnet/engine lid and plastic windscreen, otherwise I´d have had those 10+ kg of lightness added years ago
50 lbs on the seats is WOW! Neat!
I have been looking for aluminum tracks somewhere. It seems nobody makes a good set. I have seen a few lightweight tracks but they are really designed for bottom mount seats. The lightest and lowest seats all seem to be side mount. At this point my plan is to cut up a set of OE tracks and use some steel tabs to attach to the side mount points. Im not really happy with that solution since it would be heavier than direct mount brackets and will also require re-tapping the mount points in the floor.I left some 5 kilos or so on the floor with the choice of rails. ´On the floor´ being a key thing. It is in the centre and on the floor so even though 5 kg is 5 kg, the location made me give more weight to functionality.
Whishing you lightness, whatever the choice will be.