<VV> Arcing wires in the dark (Now arcing damper.)
r.gault at sbcglobal.net
Wed Aug 6 00:57:28 EDT 2008
I'd speculate that this rather tiny current is grounded through the throwout
bearing is a std trans car - lower resistance than the main bearings.
FWIW, in my previous life as an ion implanter designer, while chasing a
mysterious bearing/grease failure problem, I ran a series of experiments
running low currents ( about a milliamp) through some grease filled ball
bearings. The resistance was almost unmeasureably low, leading me to
believe that the energy in any sparking was too low to vaporize the metal
surface. As it turned out, the spalling failures I was seeing were caused
by the high vacuum rated silicone grease I was using - terrible film
strength at low speeds (300 rpm in my case). The problem only occured when
under vacuum and I was testing at atmospheric pressure so I could see what
was going on. Of course, nothing was going on at atmospere. I didn't know
if my boss was going to kill me before or after I went insane. I finally
tracked down the designer of the grease (who had quit the grease supplier
over their selling of the grease without a warning about the low speed
problem) and he explained the problem to me. Changed grease, all was well.
They didn't even fire me. ;-)
----- Original Message -----
From: <RoboMan91324 at aol.com>
To: <virtualvairs at corvair.org>; <FrankCB at aol.com>
Sent: Tuesday, August 05, 2008 11:14 PM
Subject: <VV> Arcing wires in the dark (Now arcing damper.)
> If the aluminized paint dries brittle or becomes brittle with age, it is
> likely to crack across the gap where the inner and outer sections of the
> move independently. The arcing will start across the cracks in the paint
> until the paint is eaten away and the same issue remains.
> Here is a poser for the gang ..... If the static electricity in the outer
> ring of the damper travels to the inner ring and then goes to ground
> the crankshaft to the block, is it arcing from the crankshaft to the
> and causing long term damage? I know that this sort of thing is a
> mode in roller bearings. Perhaps the engine oil is conductive enough to
> the electrical charge through without arcing. Perhaps the large surface
> between all of the bearings and the crank (plus the area of the camshaft
> proximity to the block) is sufficient to last the normal life of the
> despite arcing.
> Inquiring minds want to know.
> 60' Corvette, 61' Rampside, 62' Rampside, 64' Spyder coupe, 65'
> 66' Canadian Corsa Turbo Coupe, 67' Nova Super Sport, 68' Camaro Ragtop
> In a message dated 8/5/2008 6:05:28 P.M. Pacific Daylight Time,
> virtualvairs-request at corvair.org writes:
> Message: 9
> Date: Tue, 5 Aug 2008 19:53:31 EDT
> From: FrankCB at aol.com
> Subject: Re: <VV> Arcing wires in the dark
> To: dmonasterio at megared.net.mx, chartzel at comcast.net,
> virtualvairs at corvair.org
> Message-ID: <bfb.418110d9.35ca41fb at aol.com>
> Content-Type: text/plain; charset="US-ASCII"
> Why not just run a few stripes of conductive paint (aluminum paint?)
> the rubber separator so that it touches both the inner core and outer
> Frank "likes easy to implement answers" Burkhard
> In a message dated 8/5/2008 7:15:25 P.M. Eastern Daylight Time,
> _dmonasterio at megared.net.mx_ (mailto:dmonasterio at megared.net.mx) writes:
> Never before thought on this fact which must happen on dry weather only.
> The outer part of the harmonic damper is isolated from the engine body
> bonding rubber and rubbing against the belt all the time, acumulating
> electricity. If the outer portion of the dampener becomes close enough
> know it happens) to the timing housing the sparking will occur. Worst
> scenario: Dry weather + outer edge of dampener too close to engine +
> leak... ????
> Daniel Monasterio
> PS. Will solder a small copper wire between both parts of dampener in
> my vairs... just in case.
> **************Looking for a car that's sporty, fun and fits in your
> Read reviews on AOL Autos.
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