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Author Topic: Glad it wasn't a beehive spring.  (Read 6021 times)

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johnsachs

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Glad it wasn't a beehive spring.
« on: July 01, 2018, 06:23:14 PM »

2 sets of heads came in last week for mods.
Upon disassembly of 1 set this is what I found. Installed height within specs. Valve spring open and closed within 7 psi of specs.
I bet the owner never realized he had an issue with the springs. NO other damage. Put the shoe on the other foot, what do you think would have happened if it were a beehive spring ?  >:(
John
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Yellow09SERG

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Re: Glad it wasn't a beehive spring.
« Reply #1 on: July 01, 2018, 10:33:18 PM »

John you have just about convenienced me it time to get the beehives off the heads.
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MCE

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Re: Glad it wasn't a beehive spring.
« Reply #2 on: July 02, 2018, 11:31:23 AM »

Do you still get on airplanes?
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johnsachs

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Re: Glad it wasn't a beehive spring.
« Reply #3 on: July 02, 2018, 04:55:03 PM »

Yes, just so long you're not the pilot. ;D
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HD Street Performance

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Re: Glad it wasn't a beehive spring.
« Reply #4 on: July 02, 2018, 05:58:34 PM »

Lol
Good thing it was a double.
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Yellow09SERG

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Re: Glad it wasn't a beehive spring.
« Reply #5 on: July 02, 2018, 10:38:59 PM »

Do you still get on airplanes?
Yep, but not built any of them lately either.
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grc

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Re: Glad it wasn't a beehive spring.
« Reply #6 on: July 03, 2018, 08:38:10 AM »


Yes, the dual springs have that safety factor, if one breaks the other can reduce the chances of a catastrophic failure.  But, as you can see by this example, the straight wound spring obviously can break just like the conical beehive spring.  Looks to me like the quality of springs in general could use some improvement.  Either that or there is something in the setup of the heads that's over-stressing the springs.

Perhaps we should go to desmodromic valve control?

Jerry ;)
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Para Bellum

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Re: Glad it wasn't a beehive spring.
« Reply #7 on: July 03, 2018, 01:18:00 PM »

Yes, the dual springs have that safety factor, if one breaks the other can reduce the chances of a catastrophic failure.  But, as you can see by this example, the straight wound spring obviously can break just like the conical beehive spring.  Looks to me like the quality of springs in general could use some improvement.  Either that or there is something in the setup of the heads that's over-stressing the springs.

Perhaps we should go to desmodromic valve control?

Jerry ;)
You trying to completely confuse the same HD engineers who couldn't properly design an oiling system, compensator, etc.?    :huepfenlol2:
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Twolanerider

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Re: Glad it wasn't a beehive spring.
« Reply #8 on: July 03, 2018, 01:39:55 PM »

You trying to completely confuse the same HD engineers who couldn't properly design an oiling system, compensator, etc.?    :huepfenlol2:

Perhaps they should have bought Ducati after all.  Learn from someone that uses them.
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prodrag1320

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Re: Glad it wasn't a beehive spring.
« Reply #9 on: July 04, 2018, 08:26:40 AM »

Do you still get on airplanes?


not any that have valve springs

MCE

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Re: Glad it wasn't a beehive spring.
« Reply #10 on: July 09, 2018, 10:58:18 AM »

Yes, just so long you're not the pilot. ;D

I have over 200 flight hours in my log book. So far, so good (I'm still here).

But I'd take a turbine over a piston engine every time given the choice.
« Last Edit: July 09, 2018, 12:42:34 PM by MCE Performance »
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HD Street Performance

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Re: Glad it wasn't a beehive spring.
« Reply #11 on: July 13, 2018, 11:35:31 AM »

Fixed a set of heads a few nights ago with a broken beehive. Both valves bent and piston struck.
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Yellow09SERG

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Re: Glad it wasn't a beehive spring.
« Reply #12 on: July 13, 2018, 02:36:25 PM »

Fixed a set of heads a few nights ago with a broken beehive. Both valves bent and piston struck.
Just imagine if you had been in an airplane
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Twolanerider

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Re: Glad it wasn't a beehive spring.
« Reply #13 on: July 13, 2018, 04:46:49 PM »

Just imagine if you had been in an airplane


Commercial carriers don't let you run machine tools in coach.
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TorqueInc

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Re: Glad it wasn't a beehive spring.
« Reply #14 on: July 16, 2018, 10:17:06 PM »

Fixed a set of heads a few nights ago with a broken beehive. Both valves bent and piston struck.
Factory beehives ?
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