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Discussion Starter · #1 ·
Guys whatplug wouldyou recomend for a wasp 26.?





Sonic
 

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I used an os#8 with no probs. For more compression you could use a long plug, but i would stick with the os#8's
 

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I use McCoy MC-9 (cold Plugs) with good results or I would prefer to use OS A5 Med-cold plugs or even OS R5 cold plugs. But the McCoys have been pretty good to my Wasp.


***Caution*** (Sorry Husky) I wouldn't try a longer plug...there more for motors with turbo buttons or heads. Using the long ones could damage your piston. I've seen it happen before.
 

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OS A5 - I use these with 25% Nitro and they are sweet. Slightly cooler than the OS#8.



What Nitro % are you using as this may have an impact.



Thanks,



Chris
 

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When you break it in i reckon you should use something like an An OS A3 and then switch to an A5 after break in.
 

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Toiletduck uses long plugs in his picco and it runs very well, i tried
OS R5's and had bad results. Its like 10 degrees outside here these
days(Melbourne) so i would be using the OS 8's but the best thing to do
is prolly to but a range of plugs and give them a go(although can be
expensive if brought at LHS for $13 a pop
)
 

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Nitro %age has a big impact on what 'temperature' plug to use.

OS#8 is very good for 15% nitro in an average engine. Higher nitro (esp 25%) or race motors may prefer a colder plug, as suggested by everyone else.

I've got an RB engine with Novarossi plugs, they are a lot longer (30% longer?) than the OS 8 or 5 plugs - carefully check piston clearances before trying a longer plug, at least make sure you can turn it over by hand as easily as with the standard plug.

Let us know your results too - I've only read about plugs, never had much chance to experiment.

Cheers, Oggy.
 

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Im assuming you want to know what plugs to use on cmeflys truck. He has
been using 16% nitro and im pretty sure he uses the os #8 plugs. Why
would you want to change what the engine has allways been used to?



The novarossi plugs do have enough clearance if you want to try one though.
 

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Discussion Starter · #9 ·
Ok i did buy a OS #8 $9.90.I started the truck ran for 5 min than stopped,checked the plug & it was blown.Thats y i'm wondering maybe change to another brand? Also i'm running 16% nitro





Sonic
 

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If your only running 16% then just get another OS 8...that should do fine. Although the Wasp engines run there best on 30% Nitro and a cold plug.


I sell the No.8s for $10...plus discounts for bulk buys.
 

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Me thinks if the motor has a history of blowing plugs then there are other 'issues' to sort out as well.


How many plugs has it blown?
 

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My new Wasp (3 litres old) has blown about 3 plugs. I'm not sure how
long people usually get from their plugs but I've always had to change
them every 1 to 2 litres. Sometimes I'll put one in and it'll be dead
in a minute - then I'll put another plug in and run for the rest of the
day.



I run 25% (Same fuel as AUSRC) and OS A5's.



Temperature of the new engine is between 95-120c generally.
 

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jerrah said:
My new Wasp (3 litres old) has blown about 3 plugs. I'm not sure how long people usually get from their plugs but I've always had to change them every 1 to 2 litres. Sometimes I'll put one in and it'll be dead in a minute - then I'll put another plug in and run for the rest of the day.

I run 25% (Same fuel as AUSRC) and OS A5's.

Temperature of the new engine is between 95-120c generally.

Now that surprises me... my original S25 motor had the same plug in it from new until I cracked the engine case (about 8 litres) and my new Picco went for about 4 litres on its 1st plug.


I thought if you were regularly blowing plugs it meant that there was a problem somewhere in the system.
 

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My wasp never blew a plug. They would wear out and eventually not burn
as bright but never blown. You may have gotten a bad plug(very
possible) , tuning could be way out who knows. Try another OS#8 from a
different shop and if it happens again there is something wrong.
Chances are it was just bad luck.
 

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Discussion Starter · #15 ·
So far just one,but i noticed that the top of the piston is pitted,what does that mean ?






Sonic
 

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My piston looks brand new. The plugs don't come out burnt or blown
apart. By blown I just meant they're not glowing enough to keep the
engine running.



The engine always starts easily and runs perfectly. Then if I go to use
it the next day - I'll check the plug for glow before I attempt to
start it and it won't glow enough to get that really hot red look.



*shrugs* Sometimes they last, sometimes they don't. I figured they must
be variable in quality and it was given you'd go through a few in the
life of a motor.



Skidd's experience is outstanding, I haven't met anyone who's managed
to keep the one plug through the entirety of a motors life. Several
litres sure, but...
 
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