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Collari .30 Warning!!!!!!!

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something else had to be wrong. if you take the head off of any engine you will see that the combustion chamber is recessed inside the head/button. even with a plug that protrudes from the hole a little bit, it will not be enough to contact the piston. if your friends engine was idling, there is no way there was phyical contact happening.

there was definately something wrong with his motor, and werks should replace it for him, i wont argue that. but the motor does require a std plug like a McCoy or odonnell. the OS plugs you refered to as STD are actually short plugs.
 
The glow plugs filament was blown into the plug, and the top of the piston had a very large amount of hit marks.
Unless the longer plug created so much more combustion??
I'm not the smartest guy, but I know enough not to use a long plug in that engine.
And you learned me one, on the OS being short.
 
i think corrado psi is right, i think that something else is wrong. it just doesn't really make sense. i run mccoy MC-9 plugs in all my .21 motors and never had any problems... ever! and even if that is the case, why couldn't you use 2 glow plug shims instead of 1, that would solve the problem. and also a mc-59 plug is a hot plug. you should be using a medium-cold plug. like the mc-8 or mc-9. that could also be causing some problems
 
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well ratzo, id image that something else was wrong with the motor. maybe a blown bearing or when the con-rod let loose, parts got into the combustion chamber. its very common for this to happen when a motor lets go. anything getting into the chamber will push the element into the plug, I'm surprised it was even still there. but that motor does require a long plug, just as werks said. however it would seem there was something wrong with it right out of the box. and i would send it back for replacement.

if you want to see some really scary blown motor pics I'm sure i can dig some up for you. main bearing balls embeded into head buttons and all.
 
Okay, reading the above posts, some say the Collari .30 is supposed to use a long plug, other posts are saying its supposed to use the short plugs.

So, where do we find out the "truth"?

The parts diagram paper that came with my Collari .30 states "Plug type: Std". So, I assumed that means a standard length plug vs. a long....
 
I'm using an MC-8 and it has just a tad over 15 tanks on it.
 
The plug is never in direct contact with the piston, Having a long plug or a short plug would not cause a con rod to snap. The engine would run like poop with the wrong plug but It could not kill the engine. I don't think that it would have much of an effect on compression between the 2 plugs. Ratzo I think it was a bigger problem with your buddies' engine.

A way to check and see what plug it uses it to take off the head/button, and screw your glow plug in all the way. When its all the way in it should be flush with the inside of the combustion chamber. If it does not reach the edge, or if it goes past then you know its not the correct plug. Just my .02
 
And, if you could see "multiple" hits on the piston, thats not the glow plug, because the glow plug stays in one spot. If the glow plug was hitting the piston, you couldnt turn the engine over.
 
He didn't put the shim in.
I was with him this morning and he pulled me aside,
He said he thought he put it in, but found it on his work table, (where he put the plug in).
The parts sheet still says to use a standard length plug.
I don't know what hit what.
But something hit something.

And Corrado, thanks for your help.
 
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Man, that sucks.

Why does the first post say "Forget it"?

I had a friend of mine blow an OS 21 RG with less than half a gallon run through it. The best we can figure is that he was running to rich and running a hot plug combined with a 45 degree day. With the hot plug it was firing to soon, to rich caused hydro lock, cool day caused lowered running temps. Con-rod shattered which bent the sleave and shattered the piston.

I was there for every run he made with that engine. I helped him break it in as he was new to the hobby. That was almost 2 years ago and I'm still running the same OS 21 RG I had then. Except my crankshaft broke and he gave me his dead engine to fix it with in october.
 
a std. length plug is a MC-8, MC-9, MC-59, any novarossi or RB plug, odonnel plugs, etc. OS plugs are short plugs. there is also a "LONG" plug out there too. last one i saw was made by Fox. you will know it if you see it. the tip extends below the thread a good 0.100" and it will hit your piston. its typically used in airplane engines and i dont see many shops that stock them.
 
he didnt leave a screw driver down there did he, would exsplain the multi hits on the piston LOL
 

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