Yes, remove the heads to tap. I used the CM6 10mm plugs and the Excel twin ignition ($100.00) from CH. Fits and looks great. I Really like this motor, always say if it dies I would put it on a piece of mahogany and set it on the mantle ) Good luck, red

Anyone ever run a 49cc mac on gas/glow ? was wondering about the stock carb intake no room to open it up but might not need it?I was talking to a couple of guys today they said they have worked on small engines all there lifes and you cant put a glowplug in them to run .I tride to tell them about advanceing the timing and all that,they wouldnt hear of it lol.

I guess they have been wrong all their lives cause it does work, i too was surprised when i removed power to the glow plug and the engine kept running, even a nice low idle, this was on a 21cc weedeater engine on 1 part glow fuel / 2 parts premium gasoline. As long as there's something to ignite the mixture, some compression and the mixture will burn, it will run, actually quite well on the glow/gas setup, i'm a believer.

yea one of the guys has a lawnmower shop so I guss he might have never worked on a engine? mabie mabie not .one races lawnmowers one races two stroke gokarts with a big walbro carb and does use diophram So i guss they know it all lol.I think what part made them mad was me knowing what they didnt.I should have them work on a engine lol.I kinda think alot of the lawnmower and small engine shops dosnt like stuff they have never seen or know about.I took a big bore carb to a small engine shop one time and they wouldnt sell me a rebuild kit for it.it was a walbro 11 mm.I know they had to know what would work.but they didnt like the idea it was for rc use i guss.Thats one reason I use carbs off of other engines like chainsaws for weed eaters.There used to be a good shop not to far from me they guy would let you go in the back and check stuff out.but he was bought out by one of the guys I was talking about. wont sell you a rebuild kit for weed eaters or anything.need to find another good engine shop for parts.Other then the bad stuff I am about done with my 1/4 cub with the nitro/gas 25cc homie put on the side windows the other day and played in the yard.I did end up using full time glow.I could be done in about an hour but the cold weather with snow turned to mud today babie when I start to see some good days Ill get done and go fly it!!!!!

i have actually run a gas/glow setup with NO nitro and NO onboard power!!![X(]
yes i did lose power but the idle was great, but as i didn't use any nitro the acceleration was stuttery and slow and thje top end had dropped off some.
but the fact is that it works
shaun

thisoldman: Help me understand..., You have an engine designed for glow operation, which uses a walbro carb. You state that you know you can use gasoline. Insides have bearings not bushings?
Why go to expense of drilling and threading the heads to put in a heavy sparkplug and add additional weight of an EI? By switching to 4 stroke plugs and mixing up a gasoline and glow mix and try running it without the extra mucking about. I would suspect that a head designed for glow plug would be alot more efficient than those of us that have to use adapter in a spark plug hole to mount a glow plug that ends up recessed up into the adapter. No change in designed compression would be a benefit as well.

I like your handle. So fitting for so many of us.

To find the Answer...one must go and read all the data about both versions. Tarton Twins came in 2 versions. Did the gas version have different heads?? I will look into it. Capt,n

[quote]ORIGINAL: mikenlapaz

thisoldman: Why go to expense of drilling and threading the heads to put in a heavy sparkplug and add additional weight of an EI?

True...you do not need to install the bigger spark plugs, but when running a twin cylinder electronic, ignition is not like glow. With glow a dead cylinder can happen. With spark ignition a dead cylinder (and maybe a crash) should never happen. Capt,n

everyone needs this while working on their engines or are on this forum
www.tropicalglen.com

Ken: Jute Box...love it. www.tropicalglen.com Best Regards capt,n

RIGHT ON[sm=thumbup.gif]

can you use gas/glow in a smaller engine like say a tower .40 or a normal glow engine? i HATE that mucky stuff that gets all over the wings/fuselage/myself.

The answer is yes but no. The engine would run, but would shortly fail due to lack of lubrication. The gasoline engines we are doing Gas/Glow with have needle bearings on the rod, and therefore can survive with much less oil content in the mix than a glow engine with it's bushing rod. You could run an engine on Gas/Glow, but you would have to increase the oil content, and you would still have the mess on the airplane. The only thing you would gain would be better fuel economy, at the cost of a little power.

Note that when glow engines are advertised as having bearings, they speak of the main bearings, not the rods which are bushed.

AV8TOR

dang. oh well it was worth a shot, eh?

You can try ONLY if you make a gas/glow mix with 18% of oil in it. DO NOT RUN standard glow engine on 3% oil or you will ruin the engine in no time.

Additional things not mentioned by AV8TOR:
1. You will have probably a hard time addjusting the mixture with stock carburator.
2. you neet to monitor the head temperature. Gasoline is burning hotter than methanol but cooling fins on standard glow engine are very small. If you overheat the engine you will ruin it faster, than you can say "Why this engine is running so hot?" .

I have lots of props in the 11" diameter and smaller sizes....was wondering whether anyone here has tried a tandam prop arrangement. The Lazair ultralight used this set-up. I know some boats are also running this configuration also. http://lazairforce.central5.com/

http://mypage.direct.ca/h/highland/Lazair/stkengine.jpg

So what is the advantage of stacking them on top of each other?

Conventional wisdom would be to set them at right angles to each other.

howdy. im new to the hobby being 18 next month and haveing little disposable income. so im in to saveing money. and i am in the middle of salvaging an old 25 cc weedie that iv used for about maby six years. i forgot what i was searching for when i stumbled on this thread. so i started reading and reading and reading to about page 7 maby then i decided to skip to the end because i was tired of reading about the exact molecular structure of different alcohols and how to test a spark plug with your toung lol and other off subject but useful topics. so i think i have enough info to tinker out on my potential toy. now yall started off with three to four ingredient mixtures now yall are useing one part glow fuel to 2 parts gasolene 87 oct. i presume. so is this best mix for the conversion of a magnet ignition 2stroke gas engine to a glow plug type ignition. when i first started reading i am inspired to try deisle fule cause when i think glow plugs i think powerstroke 250! but i have doubts because deisle requires a very high compression ratio. now has anyone played with strait up ethanol ar can yall not get your hands on it. being that it is a grain alcohol buying it can bee next to impossible. but there are alternatives like that invisible intoxicant everclear. lol but with a little research and some ingunuity and 1/4 in soft copper and an old pressure cooker you can jimmy rig a still to produce a non-food grade ethanol. but i wouldnt sugjest drinking it. and definitely dont even think about selling it in that form. that is why its called denatured in the stores. and might i say there are a lot of helpful folks on here. and very intelligent. keep on thinking keep on tinkering thanks

Sometimes it's better not to skip ahead.
Especially after only just 7 pages.

We have had this wall worked out for some time now. We just love to keep talking about how good we have done lol

Paul

THANKS FOR THE HELP GUYs!! there were a lot of different setups discussed and there was a lot of bull discussed also

i was just asking which on worked out the best so i dont end up blowing up an engine in my face but since i cant get a straight answer to a single question that wouldnt take one ofe you smart guys who understand this aqbout one and a half minuets just goes to show what kinda people are on this site.

and ralphbf sorry i dont have enough time to devot to reading 79 pages of info the is scattered few and far between.

now if there is someone out there who is willing to help me please do instead of being like theese guy. the least you could do is give a page number or a link.

i dont really think this is a topic that can be summed up in one question and answer. get a spark/glow adapter, 4 stroke glow plug, and 33% 10/10 nitro and 66% gas... fire it up and see how it runs. now as far as tuning goes you will have to go searching, just like i did

The tuning isn't so tough either. Tune it just like a regular gas engine. In doing so, you will notice that the idle mixture will need to be a bit richer than normal for a good transition. Usually, that's it.

On a very few I have done on Gas/Glow, I needed to adjust the regulator to get the carb to flow a bit more fuel. The regulator is under the thin metal plate with a hole in it on the carb. Under this cover is a diaphragm, and under the diaphragm is a metal lever. Raise this lever a very small amount; about .015", and try your carb again. Do this mod only if you can't get the carb to run rich enough as it comes originally.

When you get ready to start your engine on Gas/Glow, turn both carb mixture needles in until they are lightly seated, and then back them out 2 1/2 turns. This will likely be quite rich, but that's ok to begin. Let the engine warm up for at least 2 or 3 minutes before attempting to fine tune the needles. You can rough set them while it's warming up, but make sure the engine is fully warmed up before attempting to fine set the mixtures. These things take a very noticeably longer time to warm up than the little glow engines many are used to, so keep that in mind.

Now this is something I do get tired of repeating; the fuel mix:

The mixure that works, and that we recommend, and that has been successfully in use for well over a year is as follows:

1 part of 10% OIL and 10% NITRO glow fuel to 2 parts of HIGH TEST gasoline.

Good luck, and most importantly, have fun,
AV8TOR

Av8tor

You should just take what you just sent and save it to a file. When we get a now commer that is wanting to try gas/glow and ask how to do it then just cut and copy.

It is a good thing. I know that it sucks haveing to go over it agian and agian but gas/glow is getting biger and biger. There is a lot of people at my club that is asking a lot about it. they are waching me and my engines to see if they want to try it or not. No one yet but I am giveing them time.

Paul