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Model Forum / Radio Controlled / Land Models / August 2006Glow plug life
When I bought my car the guy at the store said I'd go through a glow plug while running in the car. He said it had a "4" in there but after run in I should use a "5". What does this numbering mean? Anyway, a friend told me that glow plugs don't last too long and generally wear out and that once you have troubles starting your car you should replace the glow plug. Not sure if this is fact or myth? After my experiences on the weekend I think the trouble from starting came from the glow starter battery going flat, not from the glow plus wearing out. Anyone got any experience or recommendations when it comes to glow plugs? Ta Dean > When I bought my car the guy at the store said I'd go through a glow > plug while running in the car. He said it had a "4" in there but after [quoted text clipped - 13 lines] > Ta > Dean They do sometimes die - moreso during break in. I've had a couple of experiences of dodgy running been caused by a half knackered plug. 4 and 5 will be different models of plug, depends on the make so I can't tell you the difference. Personally I just use OS A3 glow plugs, they seem to work in all weathers here in the UK and give better performance, but in Oz you may well need something cooler such as an OS Number 8.  SignatureDan - on his PC Okay thanks. Do you know what the general life expectancy is? eg. 10 tanks of fuel or 5 hours of use. Ta Dean > Okay thanks. Do you know what the general life expectancy is? eg. 10 > tanks of fuel or 5 hours of use. > > Ta > Dean Totally random as far as i can tell mate, I once broke 3 in a weekend, then never broke another with that engine after that. Always carry a spare just in case. SignatureDan - on Laptop > Okay thanks. Do you know what the general life expectancy is? eg. 10 > tanks of fuel or 5 hours of use. > > Ta > Dean Plug life really varies so it's hard to give you a number. I average 2-3 gallons per plug, but have had a few puke after a few tanks. In a .21, run OS A3's (HOT) or OS #8's (medium-hot). The OS A5 (medium cool) will be a bit too chilly for a .21, although some .25's and .28's like em'. Doc Okay, thanks. I'll ask about that next time I go to the hobby shop. So by your comments I'm guessing they don't really degrade in quality through use. When the blow, then replace them. Is that the philosophy? Dean > Okay, thanks. I'll ask about that next time I go to the hobby shop. > So by your comments I'm guessing they don't really degrade in quality > through use. When the blow, then replace them. Is that the philosophy? > > Dean That's <my> philosophy. Every plug that has died on me......has died due to coil separation up inside the top of the plug, so when you go to relight it, it doesn't light up. Doc > Plug life really varies so it's hard to give you a number. I average 2-3 > gallons per plug, but have had a few puke after a few tanks. In a .21, run > OS A3's (HOT) or OS #8's (medium-hot). The OS A5 (medium cool) will be a > bit too chilly for a .21, although some .25's and .28's like em'. > > Doc Actually I did mean to ask, when you say "hot", medium, etc. what are you referrring to? I know, beginner questions but I guess I have to learn sometime. Ta Dean >> Plug life really varies so it's hard to give you a number. I average 2-3 >> gallons per plug, but have had a few puke after a few tanks. In a .21, [quoted text clipped - 10 lines] > > Dean Ok, glow plugs come in different temps. The temps affect ignition timing (hotter plug advances ignition, cooler plug retards ignition). As a general rule of thumb, you'll need hotter plugs in cooler weather and cooler plugs in hotter weather. Every engine is different and the plug plays some part in the overall tune. As a beginner, you can't go wrong with OS #8 (medium hot), get the tune right, then play with different temped plugs once you're an accomplished tuner. Doc Thanks mate. Dean |
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