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dave
Joined: 22 Sep 2006
Posts: 1382
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 Posted: Thu Dec 07, 2006 7:49 pm Post subject: Spark Plugs BOb can you comment ? |
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Hey Bob and All .
I took a few pics of the different plugs here.
Been a long day so I hope i got it right.
http://www.cfisher.com/ngk.htm
Let me know if I screwed it up .
BTW we got over 12 inches of white stuff today- how long it stays - who
knows.
Dave
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eskflyer(at)lvcisp.com
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| Posted: Thu Dec 07, 2006 8:41 pm Post subject: Spark Plugs BOb can you comment ? |
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Dave Look at the solid cap NGK plugs . NGK told me they do not make a
aviation plug in BR8ES or B8ES , So where are these plugs coming from . I
would guess Rotax is modifying them then ?. Go get Stock number # 3863 and
stock number #3961 and compare these.
Take care fly safe fly low fly slow
John Perry
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aerocontrols(at)clearwave
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| Posted: Fri Dec 08, 2006 8:00 am Post subject: Spark Plugs BOb can you comment ? |
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Dave,
Thaks for the pics.
First... The screw on tip that come with some of the automotive plugs can
wear, as shown in your photos. The problem with this is you now have a spot
for the electricity to arc. (when you remove these types of plugs you can
see a black sooty powder inside the spark plug cap. This is a result of the
arcing. The arcing is responsible for a lot of the "blown" spark plug caps
we see. There is a resistor inside the cap that gets destroyed).
You saved mer a bunch of trouble by posting the differences in the two types
of plugs. Thanks.... It's plainly visible that with the "aircraft" plug you
can easily get it properly gapped at .018 +-
and still have the ground tab parallel to the elctrode. The longer tab on
the auto plugs you do not end up with a parallel gap between the electode
and the tab.
Simply put..both types will work 'cause we know that from experience. The
"aviation" plugs will last longer due to the proper gapping. If you plan
on changing out the plugs frequently I don't think you'd see a
defference.... But seeing as you change out every 75 to 100 hours I'm sure
the "aviation" plugs will outlast the auto plug.
Now.... lets get on to another topic......
regards
Bob
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aerocontrols(at)clearwave
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| Posted: Fri Dec 08, 2006 3:48 pm Post subject: Spark Plugs BOb can you comment ? |
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John,
As stated in another post... These plugs do come from NGK as they
stand....They are configured for Rotax at the NGK factory... Your contact at
NGK is correct... There is no NGK number
for this configuration. and nope..... Rotax is not modifying them.
regards
Bob Robertson
Light Engine Services Ltd.
Rotax Service Center
Aero Control Enterprises, Inc.
St. Albert, Ab. T8N 1M8
Ph: (Tech Support) 1-780-418-4164
Ph: (Order Line) 1-866-418-4164 (TOLL FREE)
www.rtx-av-engines.ca
www.aerocontrols.net
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eskflyer(at)lvcisp.com
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| Posted: Fri Dec 08, 2006 5:16 pm Post subject: Spark Plugs BOb can you comment ? |
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OK now im really confused . NGK says NO WE DO NOT MAKE PLUGS JUST FOR ROTAX
. So where is the part number if Rotax is having them made by NGK ? there
has to be a number for them to order them by . I aint gonna believe NGK
makes them for Rotax until I see a Number or stock number or something from
NGK that proves otherwise. NGK says Rotax must be modifying them themselves
. This is straight from NGK . Somewhere somehow someday we are going to find
out the facts LOL. Just hope its sooner than later .
Fly safe fly low fly slow fly fun fly KITFOX
John Perry
Kitfox 2 N718PD
582 C BOX 2:62-1,clutch included
Hot pink IVO Inflight 68" 3 blade
TD / Straight Floats
580-695-8778
eskflyer(at)lvcisp.com
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aerocontrols(at)clearwave
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| Posted: Sat Dec 09, 2006 8:43 am Post subject: Spark Plugs BOb can you comment ? |
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Perry,
I guess you will just have to wait. I would believe that NGK in North
America do not have all the info and internal goings on of NGK's head
office.
I can only tell you what is passed along to us from Rotax.
regards
Bob R
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eskflyer(at)lvcisp.com
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| Posted: Sat Dec 09, 2006 5:11 pm Post subject: Spark Plugs BOb can you comment ? |
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Bob
It is interesting to note that in all Skidoo,s with Rotax engines
recommended plugs for engines are common stock numbered NGK plugs . One Plug
in particular is used in many of the rotax engines as recommended by Rotax
that is the plug BR8ES Stock number #3961 these plugs have to be gapped by
the owner when replacing them ,they come pre gapped though by rotax or
skidoo when buying a new machine . gaps are anywhere form .016 to .045
depending on the vehicle and machine and how it is to be used . Now when you
go to the dealer they will look up the part by the manufacturer number as in
rotaxes specs it says for 582 Rotax number# 897-055 . and what they hand you
is a NGK part number 3961 gapped to the spec for that application not by NGK
but by someone else. Who is this someone else I guess rotax is taking the
time to gap the same plug and charging us more but there is absolutely no
difference in the plug other than the gap .
John Perry
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