Try our new info resource - "Aladdin's Cave" (Main menu)Just added a separate link to Ash's Dropbox thread (shortcut)
For no real purpose I find it interesting, along with other's views as that is how we acquire knowledge or exhamine our own.All discussions are good I feel.I was idly wondering recently about tbe famous Pink Floyd album cover that is clearly of Refraction, when if you were to be generally hanging around the Dark side of the moon, then would probably be seeing Diffraction, which wouldn't look like that.
Quote from: Moorey on January 20, 2024, 10:04:31 AM Typically mc fuel pumps delivers 3psi. Float valves are generally overcome at approx 4.5 / 5psi. 1ft head of water gives 0.433psi do the maths. One thing many don't think of is that in use float valves open very tiny amounts so the smallest of debris is likely to stay in the valve and never be flushed through unless the carb is drained or stripped and cleaned properly. Anyone wanting to check simply put a airline with a pressure reg on a upside down carb on the carb inlet and see at what point the valve leaks air when using leak detector spray. Isn't that accumulated figure 0.433 psi going downward under sea level ? Usually at one atmosphere for each 10.06 mtrs (33ft) effectively the accumulation of the ocean above you.In air, and by lifting 1 ltr, then its nothing like that surely. I'd doubt much difference between a tank say at 20 ltr sitting just above the carbs, in comparison to 1 ltr at 6 ft higher.
Typically mc fuel pumps delivers 3psi. Float valves are generally overcome at approx 4.5 / 5psi. 1ft head of water gives 0.433psi do the maths. One thing many don't think of is that in use float valves open very tiny amounts so the smallest of debris is likely to stay in the valve and never be flushed through unless the carb is drained or stripped and cleaned properly. Anyone wanting to check simply put a airline with a pressure reg on a upside down carb on the carb inlet and see at what point the valve leaks air when using leak detector spray.
Quote from: K2-K6 on January 20, 2024, 02:55:49 PMQuote from: Moorey on January 20, 2024, 10:04:31 AM Typically mc fuel pumps delivers 3psi. Float valves are generally overcome at approx 4.5 / 5psi. 1ft head of water gives 0.433psi do the maths. One thing many don't think of is that in use float valves open very tiny amounts so the smallest of debris is likely to stay in the valve and never be flushed through unless the carb is drained or stripped and cleaned properly. Anyone wanting to check simply put a airline with a pressure reg on a upside down carb on the carb inlet and see at what point the valve leaks air when using leak detector spray. Isn't that accumulated figure 0.433 psi going downward under sea level ? Usually at one atmosphere for each 10.06 mtrs (33ft) effectively the accumulation of the ocean above you.In air, and by lifting 1 ltr, then its nothing like that surely. I'd doubt much difference between a tank say at 20 ltr sitting just above the carbs, in comparison to 1 ltr at 6 ft higher. The volume of petrol in either tank is not the issue here that would only alter the flow level if both tanks were of the same depth.My previous sums were out by a factor of two as a 66 ft water tower would represent 2 Atmosphers about 60 psi not 30 psi - so a foot of water is around 0.9 psi the total volume of fuel in either the bike tank or the temporary one is irrelevant. So at 6 ft above the existing petrol tank of say 1-ft the pressure would rise from 0.9 psi with an increase of 6 x 0.9 = 5.4 making the total pressure at effectively 0.9 + 5.4 = 6.3 psi. This does not take into account the difference in density between water & petrol , all pressures are based on sea level.
Quote from: McCabe-Thiele (Ted) on January 20, 2024, 03:45:49 PMQuote from: K2-K6 on January 20, 2024, 02:55:49 PMQuote from: Moorey on January 20, 2024, 10:04:31 AM Typically mc fuel pumps delivers 3psi. Float valves are generally overcome at approx 4.5 / 5psi. 1ft head of water gives 0.433psi do the maths. One thing many don't think of is that in use float valves open very tiny amounts so the smallest of debris is likely to stay in the valve and never be flushed through unless the carb is drained or stripped and cleaned properly. Anyone wanting to check simply put a airline with a pressure reg on a upside down carb on the carb inlet and see at what point the valve leaks air when using leak detector spray. Isn't that accumulated figure 0.433 psi going downward under sea level ? Usually at one atmosphere for each 10.06 mtrs (33ft) effectively the accumulation of the ocean above you.In air, and by lifting 1 ltr, then its nothing like that surely. I'd doubt much difference between a tank say at 20 ltr sitting just above the carbs, in comparison to 1 ltr at 6 ft higher. The volume of petrol in either tank is not the issue here that would only alter the flow level if both tanks were of the same depth.My previous sums were out by a factor of two as a 66 ft water tower would represent 2 Atmosphers about 60 psi not 30 psi - so a foot of water is around 0.9 psi the total volume of fuel in either the bike tank or the temporary one is irrelevant. So at 6 ft above the existing petrol tank of say 1-ft the pressure would rise from 0.9 psi with an increase of 6 x 0.9 = 5.4 making the total pressure at effectively 0.9 + 5.4 = 6.3 psi. This does not take into account the difference in density between water & petrol , all pressures are based on sea level.Where do you get 0.9psi from for a column of water 1ft high.
What, can't have this. Everyone's in agreement! Quick, someone start an oil thread... 👍