i have just picked up a couple of enw spark plugs i think i was the one that came with the buggy last time but these say VERY Cold special glow plug- whats the Very cold all about???

its a Navarossi C7-s

different plugs are used for different weather to help spark the fuel and get that engine started and running in the worst of conditions. As for which plugs do what, i have no idea. I do believe that plug you have purchased will work, but it was intended for cold starting. There are many gurus on this forum that have helped me out tons, and i am sure they will clear it up better for you.

I only know what I have read in "The Ultimate Nitro Engine Guide" and this does not mention anything about weather conditions, it is mainly to do with things such as engine size and nitro mix.

Just as the engine is designed with a particular mix of nitro in mind it is also designed with the type of glow plug in mind, its like if you use a more oil rich fuel you would generaly need a hotter plug, also a hotter plug should assist the combustion in a engine with less compresion.

Colder plugs can be used with a higer nitro mix or engines with high compression, the cold plug will need a higher compression to ignite the mix and will also prevent an engine with high compresion and a high nitro mix from combusting to early.

Its a case of suck it an see, however just like the engine manufacturers recomend ceterin %ages of nitro for there engine for optimium performance whilst retaining engine life, they normally also recomend a certain type of glow plug.......

BTW Not wishing to be pedantic but they arn't spark plugs there is a massive difference between a spark plug and a glow plug they draw little comparisons......

haha... i was going to let him know about that one sherak well, that goes once again to show that you learn something new everyday. That helps me out a lot too bro. Thx.

No Problem,

The Ultimate Nitro Engine Guide is the bible of this sport man, it answers ALL question you have regarding the engine/clutch/linkages...... After reading it general engine maintainance and tuning is a breeze. It initialy says you cant tune your engine properly unless you know what going on inside it, knowing what happening on theother side of the needles when you turn them etc.... And I must say afer reading it I whole heartidly agree.......

[link=http://www2.towerhobbies.com/cgi-bin/wti0001p?&I=LXFMW8&P=7]Link to book[/link]

i will be purchasing that book soon bro. Thanks for the link.

can i get a bit more info?

I am gonna be using 16 or 25 % nitro and i am in a hot maybe warm climte!

a cold glow plug is aite for those fuels...basically, high nitro fuels burn more easily at lower temperatures, and a cold plug will help keep temeratures down and therefore help stop the engine overheating, especially as high nitro fuels have less oil in them...nothing to do with weather

Thanks Chex thats what i was lookin for!

I agree with the chex. cold spark plugs and hot spark plugs only to descrip the spark plugs heat range.
the heat range is a measure of the spark plug's ability to remove heat from the combustion chamber. The heat range measurement is determined by several factors.
for examples, ngk bp7hs, data 7, 7 represent this type spark plugs heat range.