EcoModder Forum Block heater in the summer time

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 05-31-2015, 06:31 PM #1 (permalink) EcoModding Lurker   Join Date: Mar 2015 Location: Finland Posts: 17 Jazz - '11 Honda Jazz Elegance Team Honda 90 day: 44.64 mpg (US) Thanks: 5 Thanked 16 Times in 9 Posts Block heater in the summer time Where I'm from the summer mornings are pretty cool. Typically when I go to work I'd expect maybe 10C (50F) in the morning. I've noted that the small 1.3l engine of Honda Jazz takes about 1,5km (1 mile) to reach the level of "not-so-terrible" efficiency. During that distance it consumes twice the gas it usually does. I lose about 5l/100km worth of efficiency for that distance when the engine is cold. So that got me thinking how to reduce that distance - to zero even? And now I have! This morning I plugged in the 550W block heater and had it on for about 2 hours. When I got in the car the engine coolant was already at toasty ~50C, instantly giving me good mileage. Doing the math: Electricity: 550W * 2h = 1,1kWh = 0,11 euros Gasoline: 5l/100km * 1,5 km = 0,075l = 0,11 euros (1,5€/liter) So in my case 2 hours is the break-even point. At 2 hours it doesn't really make a difference if I use electricity or gas to warm up the engine. More tests will follow to see if I can find an optimal time for pre-heating. There might be a sweet spot somewhere around 60-90 minutes? I'm also interested to see the impact at the fuel pump.
 The Following User Says Thank You to mixu- For This Useful Post: 101Volts (01-25-2016)
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 05-31-2015, 07:13 PM #2 (permalink) ...beats walking...   Join Date: Jul 2009 Location: . Posts: 6,191 Thanks: 179 Thanked 1,519 Times in 1,120 Posts Same "efficiency" works here in Arizona...use heater in A.M. to ensure immediate warm-up and highest vehicle MPG...right from the start. As you mention, the only question is "how long" warm-up is needed and is it cheaper than the gasoline savings.
 The Following User Says Thank You to gone-ot For This Useful Post: 101Volts (01-25-2016)
 06-01-2015, 11:23 AM #3 (permalink) Administrator     Join Date: Dec 2007 Location: Germantown, WI Posts: 10,803 CM400E - '81 Honda CM400E 90 day: 58.68 mpg (US) Daox's Grey Prius - '04 Toyota Prius Team Toyota 90 day: 49.53 mpg (US) Daox's Insight - '00 Honda Insight 90 day: 64.33 mpg (US) Swarthy - '14 Mitsubishi Mirage DE 90 day: 46.78 mpg (US) Thanks: 2,145 Thanked 2,284 Times in 1,379 Posts Yep, block heaters even in the summer can produce great results, especially for those with short trips. __________________ Current project: Help me kill my alternator - it is stubborn and won't die
 The Following User Says Thank You to Daox For This Useful Post: 101Volts (01-25-2016)
 06-01-2015, 11:55 PM #4 (permalink) Custom User Title     Join Date: Oct 2009 Location: New York State Posts: 1,133 Nut Wagon - '91 Honda Civic Wagon DX Team HondaWagons 90 day: 67.84 mpg (US) CRXFi - '88 Honda CRX XFi Untitled Insight - '00 Honda Insight Team HondaGen-1 Insights Thanks: 547 Thanked 496 Times in 284 Posts I use my block heater all year! __________________ Best tank with the Honda so far is 81 MPG.
 The Following User Says Thank You to Gasoline Fumes For This Useful Post: 101Volts (01-25-2016)
 06-02-2015, 01:32 PM #5 (permalink) That VX guy!     Join Date: Nov 2007 Location: Mini Soda Posts: 824 Odie2 - '04 Subaru Impreza WRX Wagon 90 day: 20.5 mpg (US) Thanks: 74 Thanked 75 Times in 49 Posts I use the EBH on my subaru quite often in the summer as well. __________________
 The Following User Says Thank You to TomO For This Useful Post: 101Volts (01-25-2016)
 06-02-2015, 02:17 PM #6 (permalink) Master EcoModder     Join Date: Dec 2011 Location: Vermont Posts: 3,111 Gaptooth - '00 Honda Insight Team HondaGen-1 Insights 90 day: 55.63 mpg (US) Such Fit - '07 Honda Fit Sport 90 day: 41.27 mpg (US) Velomobile - '13 Sun Seeker EZ-TAD SX Last 3: 2142.86 mpg (US) Thanks: 1,075 Thanked 1,201 Times in 773 Posts I use my block heater when I have opportunity. Warmup time on the Insight's 1.0 is pretty short because it has a water jacket over the header, but the math still works out in favor of using it. Does anyone know if there's any point in using a block heater with a daily driven Prius, due to its hot water reservoir? __________________ 2000 Insight TLC & Build Thread HCH1 Ecomodding
 The Following User Says Thank You to Ecky For This Useful Post: 101Volts (01-25-2016)
 06-02-2015, 02:36 PM #7 (permalink) Administrator     Join Date: Dec 2007 Location: Germantown, WI Posts: 10,803 CM400E - '81 Honda CM400E 90 day: 58.68 mpg (US) Daox's Grey Prius - '04 Toyota Prius Team Toyota 90 day: 49.53 mpg (US) Daox's Insight - '00 Honda Insight 90 day: 64.33 mpg (US) Swarthy - '14 Mitsubishi Mirage DE 90 day: 46.78 mpg (US) Thanks: 2,145 Thanked 2,284 Times in 1,379 Posts Yes, it still helps a fair amount. The Prius has a pretty horrific cold start penalty. You can't EOC and other things unless its warmed up. __________________ Current project: Help me kill my alternator - it is stubborn and won't die
 The Following User Says Thank You to Daox For This Useful Post: 101Volts (01-25-2016)
 06-02-2015, 03:24 PM #8 (permalink) Master EcoModder     Join Date: Sep 2011 Location: USA Posts: 419 Frogger - '00 Honda Insight 90 day: 64.35 mpg (US) Scooby Lue - '03 Subaru Forester X 90 day: 24.8 mpg (US) Thanks: 13 Thanked 193 Times in 107 Posts Another one to point out is a heater pad on the oil pan. I did this recently and noticed even further improvements in MPG on my short drives, as well as better idle. I plug my car in every night and have a timer setup to warm up my car for about an hour or so before I leave. Anything more than this doesn't give much benefit in heat. (though, I should do another graphing session on these temps for VS ambient temp, that would be interesting...)
 The Following User Says Thank You to NoD~ For This Useful Post: 101Volts (01-25-2016)
 06-13-2015, 11:52 AM #9 (permalink) EcoModding Apprentice   Join Date: May 2011 Location: Oregon Posts: 100 Thanks: 0 Thanked 24 Times in 20 Posts I had an oil pan heater on my previous car. I connected it to an X10 circuit so whenever I got up in the morning, the first thing I would do was to push the button turning on the heater. By the time I got out to the car it had had about enough of a warmup. This is another thing I need to get done for my current car. __________________
 The Following User Says Thank You to PaulB2 For This Useful Post: 101Volts (01-25-2016)
 06-23-2015, 04:09 PM #10 (permalink) EcoModding Lurker   Join Date: Mar 2015 Location: Finland Posts: 17 Jazz - '11 Honda Jazz Elegance Team Honda 90 day: 44.64 mpg (US) Thanks: 5 Thanked 16 Times in 9 Posts I've been collecting data via the OBD2 port for the past month now, and here are some interesting results. I'll let you make the conclusions. I filtered out all trips shorter than 5 kilometers. Last edited by mixu-; 06-23-2015 at 04:11 PM.. Reason: More info
 The Following User Says Thank You to mixu- For This Useful Post: 101Volts (01-25-2016)