Keith20EH Posted November 6, 2020 Report Posted November 6, 2020 I just got my preheater out of summer storage, about $25 in materials, takes about an hour when below freezing. 2 2 Quote
HRM Posted November 6, 2020 Report Posted November 6, 2020 I suggest caution, a Heat Gun is not a hairdryer. The concentration of heat put out by a gun is phenomenal and could ignite the engine. A small, high quality ceramic space heater would serve you better, you want gentle, controlled heat. 2 1 Quote
GDGR Posted November 6, 2020 Report Posted November 6, 2020 This does the trick, and I’m in Canada. -20 C and it’ll heat the engine and cylinders to room temperature. I have it on a wifi timer and set it for 2-3 hours before I fly. 3 1 Quote
whiskytango Posted November 6, 2020 Report Posted November 6, 2020 58 minutes ago, HRM said: I suggest caution, a Heat Gun is not a hairdryer. The concentration of heat put out by a gun is phenomenal and could ignite the engine. A small, high quality ceramic space heater would serve you better, you want gentle, controlled heat. +1 on caution using a heat gun. A significant risk is heating electrical insulation to the point that it softens. Any electrical conductors that are in contact with other conductors, or metal in the airframe could eventually ground out. If the resulting fault current isn't enough to trip the breaker you could have localized high-resistance heating, leading to a fire. 2 Quote
N9405V Posted November 7, 2020 Report Posted November 7, 2020 I’ll chime in from the warm and sunny South. You might want to consider throwing some heat into the cabin. The plastic trim can get really brittle when it gets cold and the avionics can use some loosening up.Sent from my iPhone using Tapatalk 1 Quote
kmyfm20s Posted November 7, 2020 Report Posted November 7, 2020 The most basic Reiff heat strips are $209 which gets the heat to the most critical part, the oil. You just JB weld them to the oil pan. 1 1 Quote
Tcraft938 Posted November 7, 2020 Report Posted November 7, 2020 I have an EZ-heat pad, very easy to install and comes with paperwork, about $150. For real cold also a red dragon propane heater that was fortunate came with the plane. Again if very cold, I run a space heater in the cabin while i'm getting things ready and preflight. Always have a fire extinguisher at the ready. Thing can go wrong and have seen it happen to a friend's plane. The fabric covered plane next to him didn'tdo well either 1 Quote
Shiny moose Posted November 7, 2020 Report Posted November 7, 2020 Ez heat is a great cheap way, simple to install, simple to plug in, cover cowl with old sleeping bag that zipper has been removed. Just remember its not a cold start, anymore kinda half a hot start. 1 Quote
Jim Peace Posted November 7, 2020 Report Posted November 7, 2020 Come down to the creek....there are homes for sale and no preheating..... 1 1 Quote
M20F Posted November 7, 2020 Report Posted November 7, 2020 On 11/5/2020 at 1:13 PM, Hank said: Tanis also works well, a heater pad on the oil pan. REIF is cheaper and better in my experience. Either will do the trick. A set of rings and pads is fast and more importantly heats everything evenly. If you are going to fly in the winter seems to me @$1000 is pretty cheap protection on a $30K+ engine versus using Rube Goldberg contraption. 1 Quote
Derrickearly Posted November 8, 2020 Author Report Posted November 8, 2020 With my 500w inverter, I can only push a maximum of 100W into the heat gun. The exhaust temperature is 62 C on a 24 C day. I'm thinking this is reasonably safe to try; although it may take way too long. Quote
carusoam Posted November 9, 2020 Report Posted November 9, 2020 That picks up a few different challenges... 1) Low output of heat... 2) Your car engine is good at putting out heat, do you want to run it for an hour to do this? 3) inverting DC power to AC, to run a heater... is a high tech work around for a system that doesn’t care... 4) Get 12V space heater, plug it in... 5) get HF generator, and use it instead of the car... 6) Don’t think about using the car’s exhaust as a source of heat... too much other chemistry being blown with it... 7) To get the engine started... heat the intake tubes sufficiently... that will evaporate the fuel... (especially for an M20C) heat the cylinders sufficiently... keeping the fuel evaporated in the chamber works wonders... 8) Warm the oil... this is for the health of the engine during the first few minutes of running... 9) Don’t heat the fuel... this would give you the hot start challenges at a time that is really unwanted to have additional challenges... PP thoughts only, not an electrical engineer... Best regards, -a- 1 Quote
Ragsf15e Posted November 9, 2020 Report Posted November 9, 2020 15 hours ago, carusoam said: That picks up a few different challenges... 1) Low output of heat... 2) Your car engine is good at putting out heat, do you want to run it for an hour to do this? 3) inverting DC power to AC, to run a heater... is a high tech work around for a system that doesn’t care... 4) Get 12V space heater, plug it in... 5) get HF generator, and use it instead of the car... 6) Don’t think about using the car’s exhaust as a source of heat... too much other chemistry being blown with it... 7) To get the engine started... heat the intake tubes sufficiently... that will evaporate the fuel... (especially for an M20C) heat the cylinders sufficiently... keeping the fuel evaporated in the chamber works wonders... 8) Warm the oil... this is for the health of the engine during the first few minutes of running... 9) Don’t heat the fuel... this would give you the hot start challenges at a time that is really unwanted to have additional challenges... PP thoughts only, not an electrical engineer... Best regards, -a- Agree, but in addition to the oil, heating the cylinders & pistons is good if it’s really cold and the clearances are reduced by the contraction. If you heat the oil long enough and cover the cowl with a blanket, I bet it warms the top of the engine too. 2 1 Quote
Bravoman Posted November 10, 2020 Report Posted November 10, 2020 I would bite the bullet and just get a Tanis or Reiff installed. When on the road you just plug it in and you don’t have to worry about carrying extra equipment except maybe a moving blanket for the cowl. 3 1 Quote
HRM Posted November 19, 2020 Report Posted November 19, 2020 On 11/8/2020 at 10:16 PM, carusoam said: 2) Your car engine is good at putting out heat... Just going to throw this out and keep in mind I'm an EE who is thermodynamically challenged, but has anyone thought of running a hose from their car exhaust up into the engine compartment of their Mooney? Of course, we are talking outside of the hangar or with the door open. Sit in your car and stay toasty while it warms up the engine. Quote
Derrickearly Posted November 19, 2020 Author Report Posted November 19, 2020 25 minutes ago, HRM said: Just going to throw this out and keep in mind I'm an EE who is thermodynamically challenged, but has anyone thought of running a hose from their car exhaust up into the engine compartment of their Mooney? Of course, we are talking outside of the hangar or with the door open. Sit in your car and stay toasty while it warms up the engine. I read previously that folks are concerned with moisture and corrosive combustion products. At this point, I'm sold on the Reiff preheat system. 1 Quote
Hank Posted November 19, 2020 Report Posted November 19, 2020 (edited) 33 minutes ago, HRM said: Just going to throw this out and keep in mind I'm an EE who is thermodynamically challenged, but has anyone thought of running a hose from their car exhaust up into the engine compartment of their Mooney? Of course, we are talking outside of the hangar or with the door open. Sit in your car and stay toasty while it warms up the engine. Lots of water in engine exhaust. The primary exhaust gases are CO2 and H20, plus other fun things like CO, NOx, etc. Not the best thing to pump into your cowling or exhaust pipes. Edited November 19, 2020 by Hank Quote
RLCarter Posted November 19, 2020 Report Posted November 19, 2020 34 minutes ago, Hank said: Lots of water in engine exhaust. The primary exhaust gases are CO2 and H20, plus other fun things like CO, NOx, etc. Not the best thing to pump into your cowling or exhaust pipes. I’ve always heard that for every 8 gallons of gasoline burned 1 gallon of water is produced Quote
jaylw314 Posted November 19, 2020 Report Posted November 19, 2020 1 hour ago, RLCarter said: I’ve always heard that for every 8 gallons of gasoline burned 1 gallon of water is produced I had to think about that one, that initially made no sense to me. 8 gallons of gas should turn into 9 gallons of water (and about 150 lbs of CO2). I suspect if people say that, they are subtracting the initial volume of gas from the amount of water produced (which makes no logical sense but does make sense intuitively)? 1 Quote
Ragsf15e Posted November 19, 2020 Report Posted November 19, 2020 29 minutes ago, jaylw314 said: I had to think about that one, that initially made no sense to me. 8 gallons of gas should turn into 9 gallons of water (and about 150 lbs of CO2). I suspect if people say that, they are subtracting the initial volume of gas from the amount of water produced (which makes no logical sense but does make sense intuitively)? I’m asking because I’m no chemist... if 8 gallons of gas (~48lbs) get burned, how does it turn into ~213lbs of byproduct (150lbs CO2 & 9 gallons water)? Is it combining with that much O2 while burning? My simple mind says the weight in vs weight out should be similar... Quote
EricJ Posted November 19, 2020 Report Posted November 19, 2020 53 minutes ago, Ragsf15e said: I’m asking because I’m no chemist... if 8 gallons of gas (~48lbs) get burned, how does it turn into ~213lbs of byproduct (150lbs CO2 & 9 gallons water)? Is it combining with that much O2 while burning? My simple mind says the weight in vs weight out should be similar... 1 gallon of gasoline produces 18-20 lbs of CO2.https://climatekids.nasa.gov/review/carbon/gasoline.htmlhttps://blueskymodel.org/gallon-gas A gallon of gasoline produces slightly more than 1 gallon of water:http://www.applet-magic.com/watervapor01.htm Quote
clh Posted November 19, 2020 Report Posted November 19, 2020 I’m asking because I’m no chemist... if 8 gallons of gas (~48lbs) get burned, how does it turn into ~213lbs of byproduct (150lbs CO2 & 9 gallons water)? Is it combining with that much O2 while burning? My simple mind says the weight in vs weight out should be similar... in simplest terms, each molecule of gasoline(octane C8H18) uses 17 molecules of Oxygen and produces 8 molecules of CO2 and 18 molecules of Water. so the 8 gals of gas has approximately 40.5 lbs of pure C atoms and 7.5 lbs of H. The 40.5 lbs of C consumes 216 lbs of oxygen the end result is what you get. 1 Quote
Ragsf15e Posted November 19, 2020 Report Posted November 19, 2020 Just now, clh said: I’m asking because I’m no chemist... if 8 gallons of gas (~48lbs) get burned, how does it turn into ~213lbs of byproduct (150lbs CO2 & 9 gallons water)? Is it combining with that much O2 while burning? My simple mind says the weight in vs weight out should be similar... in simplest terms, each molecule of gasoline(octane C8H18) uses 17 molecules of Oxygen and produces 8 molecules of CO2 and 18 molecules of Water. so the 8 gals of gas has approximately 40.5 lbs of pure C atoms and 7.5 lbs of H. The 40.5 lbs of C consumes 216 lbs of oxygen the end result is what you get. Ahh, thanks. That’s a lot of oxygen consumed! Quote
EricJ Posted November 19, 2020 Report Posted November 19, 2020 1 hour ago, Ragsf15e said: Ahh, thanks. That’s a lot of oxygen consumed! Consider the stoichiometric air/fuel ratio is pretty high for vaporized fuel, and the displacement of an aircraft engine is quite high and moves a LOT of air volume through in every two revolutions, but does not use much fuel in just two revolutions. It takes a lot of O2 to burn a little fuel, so it's a significant contributor to the output. It's also an interesting example of how high the energy density is in gasoline. There aren't many things that come close that are easily portable. 3 Quote
PT20J Posted November 20, 2020 Report Posted November 20, 2020 Oh man, this is making me travel back in time to chemistry class. I hated balancing equations, but his one is pretty simple. Avgas is a complex brew of hydrocarbons and other chemicals, but to use the octane example, complete combustion would combine the octane with just enough oxygen to result in the production of only carbon dioxide and water. 2C8H18 + aO2 =bCO2 + cH2O Balancing carbon: b=16 Balancing hydrogen: c=18 Balancing oxygen: 2a = 2b + c, or a =25 I'll let someone else figure out the weights Skip Quote
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