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TOPIC: Speedometers

Speedometers 10 May 2019 14:51 #95330

  • RickG
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Marc, I added another image to the first post on that second page here.

A lot of what you'll read about bleeding suggests that it should be done when you first put the boat in the water to equalize the pressure that, at least theoretically, results from submerging the pickup. I was curious about this and tried putting a pickup on my test gauge and submerging it. In 16" of water (...the deepest source I had handy), my gauge didn't register. I've read that this could be as much as .2 PSI (...sorry, too lazy to do the math, but for the sake of argument I'll accept it). This isn't enough pressure to noticeably move the needle on any of the speedometers I've worked on. Also, while on plane, your pickup won't be anywhere near that deep so I'm thinking that this really won't have much of an effect on accuracy, at least for our recreational purposes. When you bleed the system in the water you're also moving the air-water interface up into the tubing since water will enter up to the 'at rest' waterline. I'm guessing that there may be some benefit to this in smoothness of operation, but I'd need to do do some testing to see if that's really a thing or not.

If I were to install a bleed valve, and I might for ease of maintenance, it'd be a good quality 3-way toggle valve. Installed out of sight at a high point of the tubing run (...under the dash maybe?), it would allow you to quickly and easily bleed, drain, or even blow out the line, while shutting off the path to the speedometer head. If you inadvertently left it open while underway, you might get a little wet, but wouldn't damage anything but your pride. ;).

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Last edit: by RickG.

Speedometers 09 May 2019 22:12 #95309

  • HawkEyes
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Rick what thread did you say you put the most recent Airguide information at? Also, do you have a picture of a modern bleeding valve I would need? I am just understanding I have to bleed the line every time the boat goes In the water?

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Mercury Marc, No trailer Queen here! 1958 Hawk II, 1961 Merc 400
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Speedometers 01 May 2019 04:25 #95094

Hey Rick,
Any updates on the tuneup?

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Ray

"Every man takes the limits of his own field of vision for the limits of the world."
Arthur Schopenhauer

1956 Vagabond I - 50 HP Johnson
1950 Flyer - 50 HP Evinrude
1/2-195something Flash - KG7
1956 Golden Rocket, Sawzall Special

Speedometers 01 May 2019 01:03 #95088

Hey Guys -

I wanted to show another example of Rick's outstanding work.

Here's a before picture of a Muskegon speedometer that I sent him:



And here is the "after" picture:



Very reasonable prices and awesome work!

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Speedometers 20 Apr 2019 00:04 #94864

Sounds good Rick. No hurry here.

- Mark

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Speedometers 19 Apr 2019 14:08 #94856

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Mark and Ray, Your speedometers have arrived, and I hear there's another on it's way here. Since I'm doing more of these, I'll be upgrading my calibration rig a bit, so these will take a few extra days while I wait for some parts to arrive mid-next week.
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"Kiss my ass, I bought a boat; I'm going out to sea." - Lyle Lovett
'54 Vagabond - '55 Mark 55
'59 Crestliner Jetstreak - '60 Merc 300
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Speedometers

Speedometers 16 Apr 2019 03:21 #94705

Yup, clear your bench...mine is on the way as well. :)

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Speedometers 16 Apr 2019 00:59 #94701

  • BigBadJon
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Great thread. The skill level here is incredible.
My supervisory expertise is expanding daily.....B)
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Speedometers 15 Apr 2019 22:23 #94697

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I'll clear the bench. ;)

BTW, my supply of compression fitting nuts came today. The lathe makes short work of modifying them. I'll send some back with your speedometer.

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"Kiss my ass, I bought a boat; I'm going out to sea." - Lyle Lovett
'54 Vagabond - '55 Mark 55
'59 Crestliner Jetstreak - '60 Merc 300
Etched Panels & Plates
Speedometers

Speedometers 15 Apr 2019 21:58 #94692

Hey Rick,
Another Speedo on it's way!
Thanks
Ray

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Ray

"Every man takes the limits of his own field of vision for the limits of the world."
Arthur Schopenhauer

1956 Vagabond I - 50 HP Johnson
1950 Flyer - 50 HP Evinrude
1/2-195something Flash - KG7
1956 Golden Rocket, Sawzall Special
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