Go Back   EcoModder Forum > EcoModding > DIY / How-to
Register Now
 Register Now

Reply  Post New Thread
Submit Tools LinkBack Thread Tools
Old 11-17-2007, 03:48 PM   #1 (permalink)
Dartmouth 2010
SVOboy's Avatar
Join Date: Nov 2007
Location: Hanover, NH
Posts: 6,447

Vegan Powa! - '91 Honda CRX DX
Team Honda
90 day: 66.52 mpg (US)
Thanks: 92
Thanked 122 Times in 90 Posts
Send a message via AIM to SVOboy Send a message via MSN to SVOboy Send a message via Yahoo to SVOboy
DIY - Thermostat Install

Replacing the thermostat is one of the easiest, cheapest, and most imperceptible ways to increase fuel economy. Stock thermostats, which generally open at around 180 degrees, are a compromise between performance and fuel economy. If you're treating your engine kindly you can get away with installing a 195 degree thermostat in order to push your fuel economy up ever so slightly. Since most radiator fans will not turn on until a 210+ degree condition is reached, you should be fine under normal conditions.

Take a look at this graph relating fuel trim to engine temperature in Hondas. This offers some theoretical evidence of the savings, though it is generally so small that testing would be nearly impossible:

Purpose: A hotter engine runs more efficiently. By increasing the coolant temperature a few degrees we can improve the efficiency of the engine very slightly.

Time: 30 minutes

- Socket Wrench
- Basic Metric Socket Set
- Pliers

- 195 Degree Thermostat
- Thermostat Gasket
- Coolant to replace that which you spilled

1. Take a look at your damn engine compartment. Find the thermostat housing. It's in the middle of this picture, with the big hose going to it:

2. Get your pliers on the big clamp, move it off, and take off the big hose going to the thermostat:

3. Take the one side of the housing off (two 10mm bolts) and expose the thermostat.

4. Yank the old thermostat out with some pliers. Now you realize where all the spilled coolant will come from!

5. Put the gasket or new gasket on the new thermostat.

6. Put the thermostat back in and replace the housing. Tighten it down not to much, but just enough. Torque specs help!:

7. Look at your completed work.

Note: I will likely be undoing the 195 degree swap in the future for various reasons, but still, here ya go.

  Reply With Quote
Alt Today
Popular topics

Other popular topics in this forum...

Old 11-16-2008, 05:12 PM   #2 (permalink)
Driving God
WTFM8's Avatar
Join Date: Mar 2008
Location: Atlanta, GA
Posts: 31

Yoko - '97 Honda Civic HX
90 day: 40.04 mpg (US)

Big Red - '91 Honda CB750 Nighthawk
90 day: 46.29 mpg (US)

Fiddy - '01 Honda SR 50 Elite
Last 3: 97.85 mpg (US)

Trolly - '01 Trek 7200 Multitrack Hybrid Road
90 day: 22.14 mpg (US)
Thanks: 0
Thanked 1 Time in 1 Post
Why would you need to undo the 195F thermostat?

  Reply With Quote
Old 11-18-2008, 03:32 PM   #3 (permalink)
EcoModding Lurker
Join Date: Jul 2008
Location: US
Posts: 76

sukisuki - '00 Suzuki Grand Vitara 4wd
90 day: 21.88 mpg (US)
Thanks: 1
Thanked 15 Times in 6 Posts
Probably putting an electrical one so he can change the temperature when he wants? Just guessing.

  Reply With Quote
Reply  Post New Thread

Thread Tools

Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Content Relevant URLs by vBSEO 3.5.2
All content copyright EcoModder.com