will these work ok in regular 40-91 2 stroke glow engines? http://www.ebay.com/itm/H8-NEW-FOX-G...48402088174332



they are dirt cheap for 4 plugs, i gambled and ordered 2 sets

I just bought the last 2 cards. I think they are rated hot plugs and are idle bar plugs. This is fine for me since I will run the plugs in high compression engines with little or no nitro. Here is a link that tells about plugs and their applications:

http://www.rd-rc.org/

Sincerely, Richard/Club Saito #635

so they wont run good with 15% nitro? i guess there is only one way to find out....i clicked on it and it took me a club website i didnt see any plug info

On the club site there is a sidebar that lists good stuff including the glow plug info. Click that. In short, here is what they say about plug types:

RC RULES OF THUMB TO LIVE BY

" Use a hot plug with low nitro (less than 24%), and a cold plug with high nitro (more than 25%).
If you remove the glow starter from you idling engine, and notice an immediate drop in RPM, you may need a hotter plug or more nitro.
If your engine has a tendency to backfire a lot, you may be using a glow plug that's too hot, or you may need fuel with less nitro.
Most hot plugs can take up to 2.0 volts starting power without burning up, while most cold plugs prefer 1.2 to 1.5 volts starting power.info/links. "

So, you should be OK with up to 24% nitro. But use the guidelines to see what heat you should be using. Note that they are 2 volt plugs, I use a lead acid gel cell battery with adjustable current to the plugs through a panel on my flight box, so no problem for me. A 1.2 volt NiCad or NMH glow igniter battery may not heat it up enough.

Another thought: These are long plugs with an idle bar, on some engines (OS) they may be too long and may hit the piston top. Check this carefully before starting or even turning the engine over. If the plugs are too long you might try to use an extra washer or two to "shorten" the plug reach. Others are welcome to comment as I have not tried this myself (yet).

Sincerely, Richard/Club Saito #635

thanks for the great write up Richard.... i fee a lot better now! i have something to disclose....i ordered 4 packs for 26 and change shipped i was embarrassed to admit it at first.... i think i hit the jack pot, even if they only last a few months...ill have a ton.... plus if a flying buddy needs one, it wont be a problem, ill have plenty

I have used Fox plugs since 1953 ( Fox .35 Combat/CL) and only had one failure due to insulator breakdown and leakage. I would have bought more, but they only had two sets left.[]

Sincerely, Richard/Club Saito #635

I have used many varieties of Fox plugs for many years with nothing but good results. While Fox are my usual plug of choice I haver never used the 2 volt plugs. What do you use for a battery?

jess

wow thats a long time!!!!!!!



im gonna bank on a fully charged glow ignitor... i hope it will make it glow enough to start my engines.... as spaceworm mention ed above there are hobby panels that allow you to dial in the voltage on a corded glow ignitor

I use a 7 AH lead acid gel cell battery with adjustable current to the plugs through a panel on my flight box. In addition to providing the necessary voltage/current, the meter on the panel shows if I have a shorted or open plug, or if the engine is flooded. The panel also provides 12 volts for my electric starter and reversible 6 volts for my electric fuel pump. Mine is Hobby Lobby, but Tower still sells an equivalent one.

Sincerely, Richard/Club Saito #635

Fox glow plugs are excellent. I have been using them for so many years I forget when i started, maybe back in the early seventies or later.
The 2.0v plugs work great off of a single lead acid battery cell. I ran those plugs for quite a few years using a single cell myself.
I still have some, but I haven't used them since my last lead acid cell finally gave up the ghost.
I see no reason to buy more expensive foreign glow plugs unless you are competing and need the slight edge they might give you in a competiiton.

You can use the 2 volt plugs with a power panel but may have a problem in lighting them up with a single Nixx cell. A power panel always puts the full 12 volts across the plug for a short time (typically 10 milliseconds every 100 milliseconds) so that it averages out to what a 1.2 volt cell would deliver. By adjusting the pot (it determines the ratio of on/off time the 12 volts is supplied) you can change this effective power a bit when using a power panel.

The Fox RC Long (with idle bar) glow plugs were first developed for use with cross-flow engines with a baffle on the piston to protect the glow element from being splashed with cold raw fuel during idleing thereby being cooled causing the engine to die. With the advent of Schnuerle ported engines in the 70s the idle bar was no longer needed because those engines no longer have a baffle. The idle bar glow plugs still work fine with Schnuerle ported engines as long as they do not hit the top of the piston. I still use Fox RC Long plugs and other Fox glow plugs along with OS plugs in all of my engines depending on what is available and price. Last summer I ordered a Fox Eagle IV .74 engine directly from Fox and because of manufacturing problems, it took 3 months to receive the engine. As a way of saying sorry, Fox included a full card (12 plugs) for free in the shipment. That is enough to fit all of my mounted 2 stroke glow engines for a number of years.

Bruce

I too purchased a Fox 74 last year (really nice engine) and received a free card of 12 RC Long plugs with idle bars. The Fox 74 runs nicely on the Fox plug but I tried them on several of my non-Fox 2-stroke engines with poor results.

When switching from a regular plug to an idle bar plug in the modern engines, I think I usually lost a few hundred rpm on the top end. Not a big deal for sport flying though.

Ernie Misner

In the midst of doing battle with my Super Tigre S90K carburetor I had a stockpile of various branded plugs including a Fox Long Car plug (hot) and a Fox Idle Bar (hot) plug. I tried the Idle bar plug in 3 different engines (K&B .65, TT .46, ST S90K) and none of them would stay running with glow disconnected. The Fox car plug however works rather well. I checked rpms on my S90K and noted a 200rpm drop running the fox car plug vs. my regular McCoy mc59 plugs. If the price is right, I'd use the fox non idle bar hot plugs since everyone's charging $8 or more per plug for mc59's. I can handle 200rpm less if the plug costs $6 or less.

I have been using Fox 2 volt longs, without idle bar, for many years. I have a 2 volt 5 amp hour lead acid gell cell. You can get them used from a company which sells emergency lights. (Also new from Batteries Plus.) Mine have lasted many years. I use a six foot piece of extension chord. A nicad will work in an emergency.

The Fox idle bar plug is a medium heat plug, not hot. I think it is slightly cooler than their non idle bar plug.

I think their gold series plug is hotter than both the RC long and idle bar plug, and their #8 is colder.

I dont have the little package it came in handy, but the idle bar plug was labelled as hot. I wouldnt have bought it if it wasnt a hot plug. I dont know the coil's composition but the Idle bar plug has the same size recess for the coil as the fox hot car plug and look identical when lit... Either way, even if it werent as hot a plug as a non idle bar plug, it should still have at least ran without glow power on it.

I'll have to dig up that little sleeve that the I.B plug came in. It had been at the hobby shop for awhile - it was dusty! lol.

Perhaps you are right. Here is a list of many manufactures plugs and heat ranges. This shows the Standard as hot and RC as mildly hot. I suspect the idle plug is the same as the standard but with the idle bar.

http://www.scootworks.com/rdrc/gloplugs.html

I have a full card of them and no where on the packaging does it give a heat rating. I have been using them for 35 years and in my experience I would classify it as medium to medium hot.

Bruce