Today's Message Index:
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1. 12:24 PM - solid top versus thread top spark plugs (Dennis Thate)
2. 01:06 PM - Re: solid top versus thread top spark plugs (Bob Comperini)
3. 02:12 PM - Re: solid top versus thread top spark plugs (FLYaDIVE)
4. 07:22 PM - Re: solid top versus thread top spark plugs (Guy Buchanan)
Message 1
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| Subject: | solid top versus thread top spark plugs |
I'm told there is no safety benefit to using solid top spark plugs Br8es versus
threaded top in my 503 DCDI Rotax engine on my Kolb Firestar. Is this correct
? Why or Why not ? :?
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Both optimists and pessimists contribute to our society. The optimist invents
the airplane and the pessimist the parachute. ~Gil Stern
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=382336#382336
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| Subject: | Re: solid top versus thread top spark plugs |
>
>I'm told there is no safety benefit to using solid top spark plugs Br8es versus
threaded top in my 503 DCDI Rotax engine on my Kolb Firestar. Is this correct
? Why or Why not ? :?
I personally do believe there is a benefit to using the solid top plugs. I have
personally had several of the other "screw on" ones become loose (even when using
various methods to try to secure the threaded top to the plug). With the
solid top, there is no worries.
--
Bob Comperini
e-mail: bob@fly-ul.com
WWW: http://www.fly-ul.com
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| Subject: | Re: solid top versus thread top spark plugs |
Dennis:
Good question.
The solid top does not unscrew.
The solid top has good heat transfer.
The screw on top has a poor wire attachment system since there are no
locking mechanisms for the threaded top/nut. Of course you could add your
own star washer. Or replace the supplied top with two nuts and lock
washers.
Back to the solid top - They can also be an attachment problem after a long
time of inspection use. I have NEVER seen a builder/pilot use dielectric
grease on the plug boot. Failure to use it causes the boot to dry out and
stick to the tower of the spark plug. THEN when you pull and jerk on the
boot as you remove it you distort the snap connection where the boot makes
electrical connection to the spark plug top.
So, in either case there is a lesson to be learned: Do it right or either
case will have its own failure mode.
And, if you use the screw top in a solid top configuration - Make sure you
use a pair of pliers to tighten on the top.
I prefer Solid Top. But that is my opinion. And opinions are like
ass-holes; Everybody has one and they all stink.
Barry
On Mon, Sep 3, 2012 at 3:23 PM, Dennis Thate <retroman@frontier.com> wrote:
> retroman@frontier.com>
>
> I'm told there is no safety benefit to using solid top spark plugs Br8es
> versus threaded top in my 503 DCDI Rotax engine on my Kolb Firestar. Is
> this correct ? Why or Why not ? :?
>
> --------
> Both optimists and pessimists contribute to our society. The optimist
> invents the airplane and the pessimist the parachute. ~Gil Stern
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=382336#382336
>
>
Message 4
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| Subject: | Re: solid top versus thread top spark plugs |
On 9/3/2012 12:23 PM, Dennis Thate wrote:
> I'm told there is no safety benefit to using solid top spark plugs Br8es versus
threaded top in my 503 DCDI Rotax engine on my Kolb Firestar. Is this correct
? Why or Why not ? :?
>
It always appeared to me that the material of the solid top was much
harder than the screw top. The screw on tops were made of incredibly
soft aluminum which my caps would chew through. Never had that problem
with the solid tops. However I never had a screw top unscrew, which is
the usual caution.
Guy Buchanan
Ramona, CA
Kitfox IV-1200 / 912-S / Warp 3cs / 500 hrs. and grounded
Now a glider pilot, too.
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