No, why would I?
No headbuttons get damaged from my answer, head buttons get damaged from people torqueing in their glowplugs with 250lb/ft torque.

Nobody should ever tighten any glowplug on these small engines tighter than they can do them up with thumb and weddingring-finger on each end using the cross-tool. Basicly that's all you need to tighten it, and it doesn't matter which engine it is, if you tighten any glowplug much tighter than 8kg/cm, you're going to ruin any button head.

Let's end this flame war please, we're all mature people here :)

Ok .......

I use O'donnels in them all! I'm extra crazy! Has anyone really ruined a head button installing a glow plug? I cant even imagine how much force is necessary :lol: For the record, I only run O'donnel and O.S. plugs in every engine I've had (except for the plugs that ship with the engine, i break in with those) and I've never had a failure of any kind. Hell, I dont think I've ever had a glow plug fail now that I think about it.

I kind of suspect the different taper thing is an urban myth too. The only button I ever stripped was on my first RC - a Savage 25, and I put a new plug in when the engine was still hot. Sttrrrrripppp... So I agree, overtorquing is the danger, especially on a hot engine. Part of me wonders though, cuz I did have an Orion 24 once, bought new from a guy who'd put an OS plug in it. That engine never ever tuned, trying all kinds of plugs - worst engine I've ever had. I always felt kind of suspicious about it coming with an OS plug in it..(then the back and forth with Sirio, Picco, and others..)

Is novarassi 24069 & 24063 carb same but only different in material?

is the R4 rod the same as the R7 rod, assembly wise..??? anyone

this is like the front bearing leaking causing a engine to suck in dirt argument ! ;)

I remember a machinist back a few years measured Brand new motor's and found the Taper to be genuinely different. As to the #'s ive long since forgotten. So Its Not a Myth.

Agreed, when to try to install (tighten), it is not smooth meaning something is not right. For example nova head screw vs brand xx head screw.

That's incorrect. A user on here measured both types of glowplug to the exact same degrees of inclination in the taper, and posted photographic evidence to prove it. Also this is a reputed user who I'm inclined to think knows what he's doing.

MYTH BUSTED (CLICK THIS LINK FOR PROOF) : http://www.rctech.net/forum/offroad-...iscussion.html

So there you go, PROOF given, MYTH BUSTED!!! They're all 60 degree taper. Humble pie, anyone?

Sure, the taper is 60 degrees, but the OP clearly mentions:

"Now I am not saying every brand plug will work in every motor. Os for example does not tap the thread as deep as others in the head button down to the taper. You will notice the Os has what appears to be a shorter taper. It has a smaller dia. between the taper and thread for clearance. So if you try a Nova plug in a Os the threads may bottom out before the taper seals.
I have also heard of problems using a Os plug in a Nova motor and some other brands. I feel that if the Os plug is overtightened it may smash the taper in the head into the chamber some. This is because it has a slightly shorter taper so the force is put on a smaller area. "

What's really important is the length of the tapered portion. Since the OS plug has a shorter taper which results in less contacting area, you can easily cause local damage and plasticity even using the normal amount of torque that would cause no damage or plasticity with a Nova plug. Just based on the pictures in that post, it looks like the tapered area of the OS plug is approximately a half to two-thirds of the tapered area of the Nova plug. This just increased the stress by a factor of 1.5-2 for the same amount of torque used which can easily get us over the yield stress for these aluminum heads, especially locally at the contacting surfaces between plug and head.

So to safely use an OS plug in a Nova head, stop using terms like "gorilla-tighten," and instead you should use about 1/2 to 2/3 the torque value that you normally use when using a Nova plug. This doesn't even take into account the stress concentration that would occur right where the OS taper ends, but I can easily see where what the OP suggests about using an OS plug in a Nova head can "smash the taper in the head into the chamber some because the force is put on a smaller area."

yup what he said... ^^^^^^

so you're moving the goalposts now, first it was "oh the taper is different" to the bitter end, then when that myth is busted, you go "oh but the guy said don't overtighten.."

Which I've said all along, never overtighten any glowplug, in any headbutton, because they will all break, even an OS plug in an OS head button, when overtightened, will distort and be ruined.
Any moron who overtightens his glowplugs is asking for trouble no matter which plug no matter which engine, this applies for all engines and all brands of glowplugs.

The fact remains that this "don't use an X brand glowplug" stuff just comes from people who want to sell their overpriced X brand plugs to people who have bought X brand. You should use the one that works best. I'll leave that up to whoever to decide, personally I choose to run P4 in all my Novas.

So just leave it at that then. Instead of coming back to it again and again and pushing your point :nod: Please, lets stop flooding this thread with pointless flame and get back to the normal conversation y'all were having before the issue of the glow plug came in.