RE: Glow Plug Coil
 

Allrighty then William.
Wrong. All engines, with the exception of a very few European engine are
set to run on up to 15% nitro.

Wrong. !5% nitro has been the standard in the US since the sixties. 5 and
10 % fuels for the Euros was not common.

Wrong. Everyone used 15%. Higher %'s in the YS and helos.

Wrong again.

Wrong again. 15% nitro (not a coming trend) will not over compress
standard r/c (non Euro) engines. The only thing that can "over compress"
an engine is to modify the engine and change the actual compression ratio.
Raising the nitro content from 10 to 15% will not, and can not, and never
has had anything to with the compression ratio of the engine. Changing
the nitro content can indeed change the chamber temperature, but it
cannot change the compression.


These last 2 paragraphs, read carefully by an experienced engine man
shows your lack of understanding of engines in general.

Simply running out of fuel can overheat and ruin a plug, when there is
"nothing wrong".

Any engine set to run on 15% can and will run just fine on a a hot or medium plug.
__________________________________________________ ____________

I have seen you repeatedly tell begineers running 15% nitro is harmful
and dangerous, and their engines will have to be modified, ect.

I'm calling BS on you Mister. Let me underscore this BS line one more time.

Shall I continue, William ?

MB.

>>EDIT: Put the quotes in boxes, John. Hope you don't mind. Also got rid of the "up" in front of "coming," that combination makes me upchuck.wr.

RE: Glow Plug Coil
 

John:

Thanks for the reply, but some of your rebuttals aren't. And some just miss the mark completely. The "Overcompression," for example. You should understand he's talking about effective compression, not the mechanical compression ratio except in referring to shimming the head.

One thing I do tend toward agreement with you on is the nitro percentages. My regular fuel has been 15% since 1990, or somewhere around there.

But it's time for the other side of the debate.

Dar? Care to respond?

Bill.

RE: Glow Plug Coil
 

William,

About the popular nitro percentages, I may be wrong.
In the eighties everyone used 10%.

Since I am reporting from Israel, where 90% of the commercial fuel purchased is 5% nitro, from various manufacturers,
Byron, Morgan and Model Technics (UK) being popular brands.
I may be wrong in identifying exactly when the shift toward 15% actually occured in the USA.

I didn't think it could have been as early as 14 years ago.
Clarence Lee and Dave Gierke have apparently 'missed the train' and are still using 10% nitro for their engine reviews.

Aren't the fuel manufacturers forcing the use of greater amounts of more expensive fuel?
When using more nitro, you must also use more fuel.
Also, the lower compression ratio used causes the engine's efficiency to decline - still more fuel used.

I have had one dead stick, from a mis-adjustment, in 3 years, with 5% fuel. So the 15% is not really needed for reliability.
Power? I don't think there is a large difference. Higher efficiency (through a higher compression ratio) allows an engine to utilize more of the lower BTUs of a less potent fuel, making the actual power very close.

Other claims made? Preposterous.

RE: Glow Plug Coil
 

I only use 5% nitro in my two strokes and concur with Dar, reliability is a non issue when using 5% nitro. And you don't need to be a fidgit tuner when using 5%, just set it and go.

RE: Glow Plug Coil
 

All:

Actually, the thing about nitro percentages that's relatively new is putting the percentage labels on the jugs.

Let's go back to 1960, see what we find. Nitro percentages are approximate.

Our "Everyday" fuel was from zero to 5%, Examples are K&B "Supersonic 100," Fox "Super Fuel." Testor's packaged the "McCoy" branded fuel, others were available too. About $5 per gallon.

And incidentally, the easiest diesel fuel to find was also labeled McCoy.

For those who wanted a hotter fuel others wered available in the 25% to 35% range. Examples were K&B "Supersonic 1000," Fox "Missile Mist," most of the Francisco fuels were in this range also. These were more expensive, running about $3 per quart. My opinion? These fuels were bought by people who thought they were getting better performance, but in most cases all they got was higher fuel cost and consumption.

If you flew c/l speed or free flight and could make use of truly hot fuels they were available also. "Franny's Fuel" and "This is It" were both in the 50-60% range, and you could order whatever you wanted from Francisco.And these fuels, 45 years ago, ran $20-$25 per gallon. Plus shipping.

With the rise in popularity of RC, it was found that throttled engies idled a lot better (or were more easily adjusted) with more nitro, that's when the average percentage started rising, in the middle to late 1960s.

I would guess that by 1975 the 15% fuel had become just about standard. Still many exceptions of course, it is definitely not universal even in the USA where it's not too expensive.

Bill.

RE: Glow Plug Coil
 

Rather abusive aren't you motorbrain.

WR I thought that sort of abuse was going to be precluded from these forums.

Denis

RE: Glow Plug Coil
 

You can only pile the bull so high, someone will yell "timber" ! :eek:

MB.