With 25% Nitro, 18SH Engine, tropical weather, what should be the type of glow plug (Hot/medium hot/ or Cold or super cold ) for great stability, acceleration,,,etc ....

I would suggest either a hot or med hot plug, something like an os a3 or #8. I find that most .18 and smaller engines like a hot plug.

i've been waitingyou brother, everytime running car everytime i confuse about too lean or rich...still same LN 2 1/4 out, HN 1 1/4 out with smoke from exhaust..but when i put the water (1 drop) on cooling head, it is not boiled but it smoke...will this be ok brother....and from the fuel tank when i refuel it there is a smoke too..., and when the engine is stop i saw on the fuel tubing, the fuel is back to the tank from carb...

those needle settings sound a little lean to me but as long as its not running hot (water not sizzling on the head) then your probably ok, smoke in the tank after running is normal as is the fuel in the line. Richen (turn counter clockwise) each needle like a 1/4 turn and see if it runs ok.

but when i try to richen above of it a little (1/4), the engine die on 1/2 thortlee...and brother what is mean sizzling....

sizzle is toooooo hot.

smoke coming through when i sweap a water on cooling head, does it mean too hot brother.......

to evaporate is ok, in like 3-5 seconds, to sizzle quickly and evaporate in 3 seconds or less is too hot.

i'm nt sure yet, i'll try again..evaporate less than 3 second mean too hot...i'll count it brother....see you tommorow

i'l suguest a McCoy Mc-59, its what i use and love them

Yea i use the McCoy Mc-59.. its a SWEET Plug....

Me too mc-59

ok, i'll try mc-59..

it said, the smaller engine the hottest it is, and must use the medium or the cold glow plug....is this correct...

actually its the opposite, the smaller the .18 and smaller the hotter the plug, .21 and larger use the med med/cold plugs.

You want to use a hot, med/hot plug

what is the effect or reaction of hot,med,cold glow plug to the engine..., 18 eng if use cold/med/hot

the cooler the temps the less power you will get out of it, if you use a cold plug the ignition will be cooler and there wont be as much power as a hotter ignition.

some people said if the nitro up to 20%, it must use the med or cold/med glow plug, and if the nitro under 20% must use the hot glow plug...what your suggest...

hot for 20%, med/hot for 25% and cold for 30+%

If I'm not mistaken, the MC-59 is too long. It'll stick into your combustion chamber and expose a couple of threads, which leads to hot spots and the carbon that builds up on the threads can strip out the head when you pull out the plug. The SH big blocks, anyway, take the shorter OS plugs.

Best to use a plug that fits.

I run mc-59's in all my motors without any issues right from a 15 to a 28

yeah..yeah...how about yu think brother with my setting HN 1 1/4 , LN 2 1/4...that setting give a full acceleration on my car...trying to turn out even 1/16 both the engine die on 1/2 thorttle...

Abang that sounds way too lean

The only way it would do that is if you didint use the copper washer... and you must use it, i took my head on and it was tight and flush on the under side of the head... so i have no idea what you are talking about... and it was a Mccoy Mc-59 not a turbo pulg (anyways a turbo plug wont fit) and they are no longer than a normal pulg... if it was, the Plug would act like a piston stop... there is so littel head clearence that it would just hit if it was too long...

just to clear it up

than, what should i do brother....trying to richen even a very very little turn out the engine die...