Post by: Steam Technology on August 08, 2020, 05:46:07 pm
Post by: Swift Fox on August 08, 2020, 10:46:43 am
Quote from: RedRyder
Hi Swift Fox, and thank you for your insight. It is not lead that fouls spark plugs. If this were the case it would not be deemed suitable for aviation use. Improper fuel/air mixtures and weak sparks are the main culprit with fouled plugs. A little clean burning 100 LL in my opinion, when used in a tiny hit and miss engine, is likely considerably better to breath than than poison we burn in our automobiles. Still.... all gas engines big and small should be run in a properly vented area or outdoors. Aircraft fuel blends also have greater evaporative qualities in cool environments than automotive fuels.
Gil
Combustion chamber temperature also plays a role too, as that was the reason i mentioned it as i assumed these engines had quite a low combustion temperature which could possibly have an effect but on thinking it over i guess given the short times they actually run it wouldn't have much of an effect at all. I'm quite familiar with 100LL since it what fuels the aircraft i fly. I agree modern automotive fuels that contain ethanol and other additives are quite bad.
Glad to hear you run yours in a well ventilated space or outdoors.
Post by: RedRyder on August 08, 2020, 10:16:29 am
Quote from: RedRyderYou can also use 100 LL which is 100 octane low lead aircraft fuel
poisonous additives
Technically Avgas 100LL has poisonous additives, namely TEL. Even thought it is 'Low Lead' it still contains it, so i do hope you run these engines in a well ventilated place when using 100LL Gil. Plus i'm surprised you haven't had any issues with lead fouling the spark plugs on these engines when using that fuel.
Hi Swift Fox, and thank you for your insight. It is not lead that fouls spark plugs. If this were the case it would not be deemed suitable for aviation use. Improper fuel/air mixtures and weak sparks are the main culprit with fouled plugs. A little clean burning 100 LL in my opinion, when used in a tiny hit and miss engine, is likely considerably better to breath than than poison we burn in our automobiles. Still.... all gas engines big and small should be run in a properly vented area or outdoors. Aircraft fuel blends also have greater evaporative qualities in cool environments than automotive fuels.
Gil
Post by: Swift Fox on August 06, 2020, 12:49:52 pm
Quote from: RedRyder
You can also use 100 LL which is 100 octane low lead aircraft fuel
poisonous additives
Technically Avgas 100LL has poisonous additives, namely TEL. Even thought it is 'Low Lead' it still contains it, so i do hope you run these engines in a well ventilated place when using 100LL Gil. Plus i'm surprised you haven't had any issues with lead fouling the spark plugs on these engines when using that fuel.
Post by: RedRyder on August 06, 2020, 10:23:46 am
What fuel is used for these engines? Can Coleman fuel be used?
Hi Paul, All of these small model engines should be run on Coleman fuel mixed 15 to 1 with Marvel Mystery Oil. You can also use 100 LL which is 100 octane low lead aircraft fuel also mixed with Marvel Mystery Oil. There are other pure fuels that are good to use.
It is not OK to use automotive gasoline and any other products with ethanol and other poisonous additives designed to be pushed through a catalytic converter at 1400 degrees. While the engine could run, you make an awful mess and risk your health.
Post by: yozhek on August 05, 2020, 04:33:52 am
Kind regards
Ade
Post by: Belugawhaleman on August 04, 2020, 09:07:28 pm
Post by: RedRyder on July 31, 2020, 06:59:09 am
Post by: Steam Technology on July 30, 2020, 08:18:59 pm
Post by: RedRyder on July 29, 2020, 06:46:19 pm
Playing with a tall stack.
[attachimg=1] [attachimg=2]
Post by: RedRyder on July 29, 2020, 06:13:17 pm
I removed the rear plate covering the crank case end and bored two .080" holes straight through from the other side.
This lined them up perfectly to allow oiling the piston skirt with a long needle oiler when it is at bottom or top dead center.
Gil
[attachimg=1]
[attachimg=2]
Post by: RedRyder on July 29, 2020, 05:19:29 pm
I reversed them to give us a look at them and to hide the rounded Allen screw heads from visual range.
Gil
[attachimg=1]
Post by: RedRyder on July 29, 2020, 05:16:04 pm
M12 Camshaft & Drive Gear
Enjoy!
https://youtu.be/4lpPLVVOG8M
Post by: RedRyder on July 29, 2020, 10:59:41 am
You have got that sorted ok
Runs well
Cheers
Dennis
Thanks, Dennis!
Gil
Post by: RedRyder on July 29, 2020, 10:59:12 am
Thanks, Gil. I'm going to revisit my little M12, and try some of your fixes. Awesome job.
Thanks, Benny. I'm looking forward to hearing more on yours!
Gil
Post by: Scorpion2nz on July 28, 2020, 11:46:28 pm
Runs well
Cheers
Dennis
Post by: Dr.Rev.DelmarMacReady on July 28, 2020, 10:46:40 pm
Post by: RedRyder on July 28, 2020, 06:27:09 pm
Enjoy!
Gil
https://youtu.be/jKONL-uarKU
Post by: RedRyder on July 28, 2020, 06:01:16 pm
I am uploading a video documenting the first 2 running sessions and some adjusting on the little M12.
Enjoy,
Gil
[attachimg=1]
[attachimg=2]
[attachimg=3]
[attachimg=4]
[attachimg=5]