Stop in for a cup of coffee

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Hey Ray, how about you curve me up a distributor for my 273? I don't know if those blue dot springs are right for me but sign me up if they are! @halifaxhops

Snappy and hot, pulling to 7k. Don't know what details you need or if I know them myself yet.
 
Old man ray said:
Thanks i usualy have more questions the answers.
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Ummm.....the snow is in the grass. Your are looking at a plowed parking lot as I was buying gas. It is 12 degrees with the sun shining bright.
 
360DartGT66 said:
Hey Ray, how about you curve me up a distributor for my 273? I don't know if those blue dot springs are right for me but sign me up if they are! @halifaxhops

Snappy and hot, pulling to 7k. Don't know what details you need or if I know them myself yet.
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Did you add the tag, @toolmanmike ? Thanks! I know Ray doesn't read back.
 
I went down in the basement and took some measurements and made some oil pressure calculations.

The Melling M72HV I have has a pressure regulator plunger with a diameter of 0.622". That's a cross sectional area of 0.304 in2. The pressure relief opening opens when it is depressed 0.42".

The spring that's in the pump has a spring rate of 35 lbs/in so a spring compression of 0.42" corresponds to a spring force of 14.7 lbs.

14.7 lbs spring force divided by area 0.304 in2 means the oil pressure reaches 48 psi before the relief valve opens. Makes sense.

Now. To increase the oil pressure to 75 psi I would need to increase the spring force to 75 x 0.304 = 22.8 lbs.

This corresponds to a spring compression of 22.8/35 inches = 0.65". That's an increase of 0.23" or very close to 6 mm.

So by adding a 6 mm spacer, I should get 75 psi of oil pressure without buying an $8 kit from Summit and paying $11 in shipping.

Or. I could thread the hole and add a screw and a lock nut to get adjustable pressure. But that would be just showing off :lol:
 
360DartGT66 said:
I went down in the basement and took some measurements and made some oil pressure calculations.

The Melling M72HV I have has a pressure regulator plunger with a diameter of 0.622". That's a cross sectional area of 0.304 in2. The pressure relief opening opens when it is depressed 0.42".

The spring that's in the pump has a spring rate of 35 lbs/in so a spring compression of 0.42" corresponds to a spring force of 14.7 lbs.

14.7 lbs spring force divided by area 0.304 in2 means the oil pressure reaches 48 psi before the relief valve opens. Makes sense.

Now. To increase the oil pressure to 75 psi I would need to increase the spring force to 75 x 0.304 = 22.8 lbs.

This corresponds to a spring compression of 22.8/35 inches = 0.65". That's an increase of 0.23" or very close to 6 mm.

So by adding a 6 mm spacer, I should get 75 psi of oil pressure without buying an $8 kit from Summit and paying $11 in shipping.

Or. I could thread the hole and add a screw and a lock nut to get adjustable pressure. But that would be just showing off :lol:
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It wont be showing off unless it has a knurled knob and a jam nut…
 
With all the rain NorCal had in the last 2 weeks they have another brush fire. Near the beach Monterey/Carmel area. PG&E probly nervous again. Had some pretty stout winds in that neighborhood last night. :BangHead:
 
360DartGT66 said:
I went down in the basement and took some measurements and made some oil pressure calculations.

The Melling M72HV I have has a pressure regulator plunger with a diameter of 0.622". That's a cross sectional area of 0.304 in2. The pressure relief opening opens when it is depressed 0.42".

The spring that's in the pump has a spring rate of 35 lbs/in so a spring compression of 0.42" corresponds to a spring force of 14.7 lbs.

14.7 lbs spring force divided by area 0.304 in2 means the oil pressure reaches 48 psi before the relief valve opens. Makes sense.

Now. To increase the oil pressure to 75 psi I would need to increase the spring force to 75 x 0.304 = 22.8 lbs.

This corresponds to a spring compression of 22.8/35 inches = 0.65". That's an increase of 0.23" or very close to 6 mm.

So by adding a 6 mm spacer, I should get 75 psi of oil pressure without buying an $8 kit from Summit and paying $11 in shipping.

Or. I could thread the hole and add a screw and a lock nut to get adjustable pressure. But that would be just showing off :lol:
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Not entirely true. That only determines what pressure bleeds off. Not how much oil pressure you will have
 
Mopar Tim said:
Not entirely true. That only determines what pressure bleeds off. Not how much oil pressure you will have
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If the system is linear, increasing the spring force by 50% will increase the pressure by 50% but I think some measuring and adjusting is probably needed.
 
So just got home from fighting more snow, I was tired, frustrated and basically just plain whipped. I walked out into the shop, it was warm and had the lingering scent of sage from being smudged yesterday, combined with the smell of oil and gasoline. I turned on some Joe Bonamassa, one of my favorite pickers and poured myself a toddy. Dog curled up in her chair and the shop melted my problems away. Amazing what the spirit and smells of a warm shop can do on a cold wintery day.
 
Well after a couple of toddies I could not resist and posted some religious humor in the origin of life thread. Sticker on beer fridge. Not sure I am man enough to go back in! I can hear the weeping wailing and gnashing of teeth from here! Them boys needed some levity!
 
Sublime one said:
Well after a couple of toddies I could not resist and posted some religious humor in the origin of life thread. Sticker on beer fridge. Not sure I am man enough to go back in! I can hear the weeping wailing and gnashing of teeth from here! Them boys needed some levity!
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Atta boy!
 
Sublime one said:
Well after a couple of toddies I could not resist and posted some religious humor in the origin of life thread. Sticker on beer fridge. Not sure I am man enough to go back in! I can hear the weeping wailing and gnashing of teeth from here! Them boys needed some levity!
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Cheers!

Glen giphy.gif
 
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