warren.huisman Posted November 22, 2018 Report Share Posted November 22, 2018 The engine would stumble on the right mag. This is what I found while troubleshooting this. It appears that the globe of metal is shorting the plug. Looks almost like solder. What causes this to happen? Sent from my iPhone using Tapatalk 1 Quote Link to comment Share on other sites More sharing options...
Marauder Posted November 22, 2018 Report Share Posted November 22, 2018 The engine would stumble on the right mag. This is what I found while troubleshooting this. It appears that the globe of metal is shorting the plug. Looks almost like solder. What causes this to happen? Sent from my iPhone using Tapatalk That would be lead. And it is caused by not leaning aggressively enough on the ground. Sent from my iPhone using Tapatalk Pro 1 Quote Link to comment Share on other sites More sharing options...
EricJ Posted November 22, 2018 Report Share Posted November 22, 2018 Looks like lead fouling. Keep it lean on the ground and in the air and keep idle at or above about 1k rpm on the ground. Quote Link to comment Share on other sites More sharing options...
Guest Posted November 22, 2018 Report Share Posted November 22, 2018 Lead fouling, but really rare for a fine wire plug. Clarence Quote Link to comment Share on other sites More sharing options...
N201MKTurbo Posted November 22, 2018 Report Share Posted November 22, 2018 If you scrape at that glob you will find that it is lead oxide. The surface was reduced to pure lead, but it is just a thin layer. Just trivia because it will still short your plug. Quote Link to comment Share on other sites More sharing options...
carusoam Posted November 22, 2018 Report Share Posted November 22, 2018 Great pic, Warren! often, with the lead build up, you can get small balls that settle in the bottom plugs... Lead build up occurs when the cylinders are cold, and the mixture is rich... Often, people lean aggressively on the ground... less free lead to deposit, cylinders heat up quicker... less CO to breath... all good... PP thoughts only... -a- Quote Link to comment Share on other sites More sharing options...
Hank Posted November 23, 2018 Report Share Posted November 23, 2018 On the ground, I pull the mixture about 2/3 to Idle. The engine runs fine, but will stumble if I advance the throttle to taxi uphill. Haven't had lead on my (massive) plugs for at least the last 8 years. Fine wires should be more resistant to lead fouling. 2 Quote Link to comment Share on other sites More sharing options...
FloridaMan Posted November 23, 2018 Report Share Posted November 23, 2018 11 hours ago, Hank said: On the ground, I pull the mixture about 2/3 to Idle. The engine runs fine, but will stumble if I advance the throttle to taxi uphill. Haven't had lead on my (massive) plugs for at least the last 8 years. Fine wires should be more resistant to lead fouling. This, though I can't get much past 1/3 to idle. Also, a very good idea to lean very aggressively on the ground so you cannot apply takeoff power without remembering to enrichen the mixture. 1 Quote Link to comment Share on other sites More sharing options...
Yetti Posted November 23, 2018 Report Share Posted November 23, 2018 In warm weather I am 1/3 of mixture. In cold weather more like half mixture. I was taught to keep the rpms between 1100 -12000 when not taxiing. Looks like you also need some anti sieze on your spark plug threads. Quote Link to comment Share on other sites More sharing options...
RLCarter Posted November 23, 2018 Report Share Posted November 23, 2018 41 minutes ago, Yetti said: In warm weather I am 1/3 of mixture. In cold weather more like half mixture. I was taught to keep the rpms between 1100 -12000 when not taxiing. Looks like you also need some anti sieze on your spark plug threads. 12000? Turning it a little tight ...... 1 Quote Link to comment Share on other sites More sharing options...
Yetti Posted November 23, 2018 Report Share Posted November 23, 2018 1 minute ago, RLCarter said: 12000? Turning it a little tight ...... Did you not get the turbo prop mod on your A1A? 1 1 Quote Link to comment Share on other sites More sharing options...
RLCarter Posted November 23, 2018 Report Share Posted November 23, 2018 3 minutes ago, Yetti said: Did you not get the turbo prop mod on your A1A? STC, 337 or just a logbook entry? 1 Quote Link to comment Share on other sites More sharing options...
Yetti Posted November 23, 2018 Report Share Posted November 23, 2018 6 minutes ago, RLCarter said: STC, 337 or just a logbook entry? No spar was cut, so just a minor mod, sign of by A&P 2 Quote Link to comment Share on other sites More sharing options...
FloridaMan Posted November 23, 2018 Report Share Posted November 23, 2018 I keep my RPMs as low as possible and lean aggressively on the rocket. That little vortex is sucking up all sorts of shit into your prop. 1 Quote Link to comment Share on other sites More sharing options...
carusoam Posted November 24, 2018 Report Share Posted November 24, 2018 Water makes for some interesting tracer studies...! A great way to visualize airflow as it is strong enough to drag water around with it.... And dirt and stones... Aunty M, Aunty M, it’s a twister! Thanks for sharing that vid! Best regards, -a- 1 Quote Link to comment Share on other sites More sharing options...
320KPH Posted November 27, 2018 Report Share Posted November 27, 2018 (edited) was that a two blade tornado or a three blade tornado? Edited November 27, 2018 by 320KPH Quote Link to comment Share on other sites More sharing options...
FloridaMan Posted November 27, 2018 Report Share Posted November 27, 2018 16 hours ago, 320KPH said: was that a two blade tornado or a three blade tornado? 3 blade on the Rocket Quote Link to comment Share on other sites More sharing options...
FloridaMan Posted November 27, 2018 Report Share Posted November 27, 2018 On 11/23/2018 at 10:49 PM, carusoam said: Water makes for some interesting tracer studies...! A great way to visualize airflow as it is strong enough to drag water around with it.... And dirt and stones... Aunty M, Aunty M, it’s a twister! Thanks for sharing that vid! Best regards, -a- Thank @cujet for noticing and filming it. 1 Quote Link to comment Share on other sites More sharing options...
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