just a quickie how often do you guys need to change your plugs?????

when it does not work

I normally end up changing mine at about 3 gallons as routine maintenance as I only have very few go bad. If you tune properly and use good fuel they last a long time.

I use mine for 1 gallon or so and change even if they still work.

how do you get that long out of one glow plug?? i run OS no.8 and a5 plugs with 20% nitro AT RACING brand fuel, which brand of plug do you use?i'm lucky if i get 1-2 litres out of one plug...and yes i have tried different tuning settings and still can't get that much...

I guess I should have been clearer I have only 2 1/2 gallons on my buggy and so far same plugs I have about a gallon each 1 1/4 really a little more on my OS RG with OS plugs and my STS D21B with a RB plug. On my Savage I run HPI plugs and get between 2 to 3 gallons. On he Savage I have WELL Over 7 plus gallons and only used 2 or 3 plugs if that. Then on my HPI MT I run either an OS 15 CV-RX that I have at least 8 gallons on it with OS plugs get 2 to 3 gallons on them. On my OS 18 TZ but only have about a gallon on it but original OS plug. I have others but get about the same on them as well but these are my primary 3. Most of the times I end up replacing them out of guilt more so then them going bad. People at our track that just closed say then have never seen me change a plug in any of them.

I generally only change my plugs when they start to give trouble or if they start to look bad. I can't remember ever having much trouble with plugs, I would guess that in my cars I change them every 3 gallons or so and in my planes they seem to go forever.

i don't use O.S plugs , i run Megatech Q series in my engines. the O.S plugs are a thread shorter then other plugs and should only be used in OS engines.. using OS plugs in a RB engine or similar all you are doing is lowering the compression of the engine , make tuning more complicated and will blow plugs more easily especially when your not running the right plus heat VS nitro content VS weather condition.

lower compression will lower the temp of the fuel being combusted plus with the plug not potruding into the combustion chamber like it should it will give a irregular burn of the fuel mixture.

I agree and I only use OS plugs in my OS engines.

I agree OS plugs in OS engines. The only time I really have glow plug problems is when there is a tuning issue. If a plug gets fouled pull it out and let it dry and put it back in. If a plug gets run to lean, it burns up and if you are lucky it stays in one piece and you can replace it. If not the coil falls out, and your motor chews on it if you're unlucky. If you're REALLY lucky it gets spit out the exhaust. Plugs do wear though. The coil will not work as well on a really old plug compared to a brand new plug. I believe it has more to do with making the motor easier to start and the plug more durable as far as abuse (not breaking the coil due to extreme heat) on a newer plug compared to a older plug. It doesn't hurt to change a plug after a gallon or so. Maybe even sooner.

Roger

well that sheds some light on my glow plug trouble, i never knew that os plugs were only really suited to os motors. i run a ported force engine in my caster zx1 when bashing and a rossi axe when running at club meets, what plug do you guys recommend?? a friend told me to run the rossi plugs in both what you think?

OD odonnell PLUG is the best general purpose plugs

Rossi, Novarossi, RB, O'Donnel, McCoy all make great plugs.

Based upon what criteria?