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Messages - Moorey

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16

  For less than a tenner on Aliexpress you can buy a complete front master cylinder with lever and a  hose. Just pump it out whilst at your
  bench without all the huffing and puffing. Save that for doing something else.  When done just put it back in the drawer with all your other tools. I
  bet he spends more on gloves.
  And I am a Yorkshireman

17
CB750 / Re: Head Bolts
« on: January 21, 2024, 10:30:44 AM »
What, can't have this. Everyone's in agreement! Quick, someone start an oil thread... 👍

   Who's to say I've done yet.  I might want to throw Specific Gravity into the equation just to complicate matters. ;D
 
   Anyone for ATF vs Fork Oil.   ;)

18
CB750 / Re: Head Bolts
« on: January 20, 2024, 11:01:07 PM »
     

     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.


19
CB750 / Re: Head Bolts
« on: January 20, 2024, 10:54:02 PM »
     

     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.


No just as a column of water lift the tank 10 ft and you will have 0.433 psi X 10 = 4.33psi at the pipe end. Volume in the tank is irrelevant.

A quick Google
What is the pressure exerted by a 1 foot column of water equal to?
Using Water as a Guide for Determining Pressure – Math for ...
0.433 psi
The relationship between water, height and pressure is constant. If we were to take a column of water 1 foot high and use a pressure gauge at the bottom to measure the pressure it would read 0.433 psi. This is our constant when dealing with water and it remains consistent as we add more water.

20
CB750 / Re: Head Bolts
« 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.
     

21
Misc / Open / Re: Fuel tap size.
« on: January 19, 2024, 06:30:46 PM »

  There are plenty on Aliexpress for a couple of quid 34mm centres

22
  I've had them for years sizes  from 6" to 18" and only ever broken one and that was with total abuse using a 4ft length of 2" pipe on A 15" one I
  had cut an extra tooth on the movable jaw enabling it to open wider than they are designed to do. Carrying a 10" and !5 " on your belt was a very
  common practice in pits to save carrying a heavy bag of spanners for miles. I must still have 7 or 8 of them in varying sizes.

23
New Member Introductions / Re: Greetings from the Wirral !
« on: January 14, 2024, 07:49:39 PM »


    Welcome to the forum another 350f owner here. ;)

24
Anorak's Corner / Re: Tyre Changing Jigs
« on: January 12, 2024, 08:06:11 PM »


  I must be doing Ok then as I still do my own and carry a pair of levers under the seat in case of punctures.

25
Misc / Open / Re: Old Dealer Stickers
« on: January 10, 2024, 09:48:13 AM »
 

    I have an old roll of  Alan Watson Motorcycles, Dewsbury somewhere. Honda dealer on Bradford rd Dewsbury  it was just down the road from
    Padgetts

26
CB750 / Re: Free Spares
« on: January 05, 2024, 09:39:04 PM »

   Don't give up and don't take a backward step Phil. I was given 1 to possibly 4 years, now on 12 years 4 months and I do keep count. Nothing is
   set in stone. Stay strong it's not the easiest of rides.

27
New Member Introductions / Re: New member from Somerset
« on: January 02, 2024, 11:03:38 AM »
     

          Welcome to the forum

28
CB500/550 / Re: Chasing large diameter internal threads
« on: December 31, 2023, 04:32:51 PM »

  The ends on a lot of thread files but not all are made for doing internal threads.

29
CB350/400 / Re: CB350F headlight diameter
« on: December 31, 2023, 03:50:33 PM »
   Just to add the one on mine that I bought from you James has a OD 7 1/8th  182mm  and the headlight adj on the RH side as sat on the bike. USA
   .model

30
New Member Introductions / Re: Hi from Somerset UK
« on: December 30, 2023, 11:10:44 AM »
       

            Welcome to the forum.

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