Go Back   EcoModder Forum > EcoModding > EcoModding Central
Register Now
 Register Now
 


Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 03-18-2008, 01:26 PM   #1 (permalink)
Efficiency freak
 
Bearleener's Avatar
 
Join Date: Mar 2008
Location: Berlin, Germany
Posts: 58

Frugolf - '96 VW Golf wagon
90 day: 40.36 mpg (US)
Thanks: 0
Thanked 14 Times in 6 Posts
Intake manifold heater

Cold starts suck! One good solution is a block heater, but that doesn't work for the drive home (no outlet at work). A Prius-style Thermos for the coolant would be cool, but that's complicated and requires a mighty big Thermos (or several of them) if you want to heat the entire engine quickly, and the system would probably need to be under pressure.

How about only heating the intake manifold? I read that condensation of fuel on the cold manifold passages is one major reason for high gasoline consumption when cold. Indeed, my manifold has a small electric heater as standard equipment, but that's too ineffective. I'm thinking of something like a bag (hot water bottle) contacting (lying on top of) the aluminum manifold. This hot water (not under pressure) would be stored in a Thermos overnight and pumped into the bag right after a cold start.

Somewhere I read about a warm air intake. Is this for quicker warmup or for improved steady-state efficiency? What's the heat source?

Thanks!

__________________

You ever notice that birds pulse & glide, too?
  Reply With Quote
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 03-18-2008, 01:32 PM   #2 (permalink)
Administrator
 
Daox's Avatar
 
Join Date: Dec 2007
Location: Germantown, WI
Posts: 11,153

CM400E - '81 Honda CM400E
90 day: 51.49 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
Mitsubishi
90 day: 56.69 mpg (US)
Thanks: 2,457
Thanked 2,523 Times in 1,522 Posts
I would think you would have much better results by dumping that hot water directly into the engine as coolant.

On modern cars with fuel injection there isn't much time for the fuel to cause condensation and cool the intake manifold. Thats IF the fuel even touches the intake manifold. Most designs have the injetors mounted in the head, so the fuel is injected after the manifold.
__________________
Current project: A better alternator delete
  Reply With Quote
Old 03-18-2008, 03:43 PM   #3 (permalink)
Depends on the Day
 
RH77's Avatar
 
Join Date: Nov 2007
Location: Kansas City Area
Posts: 1,761

Teggy - '98 Acura Integra LS
Sports Cars
90 day: 32.74 mpg (US)

IMA - '10 Honda Insight EX
Team Honda
90 day: 34.76 mpg (US)

Tessie - '06 Acura TSX Base
90 day: 28.2 mpg (US)
Thanks: 31
Thanked 41 Times in 35 Posts
Quote:
Originally Posted by Bearleener View Post
Somewhere I read about a warm air intake. Is this for quicker warmup or for improved steady-state efficiency? What's the heat source?
For me, the warm air intake is both for warmup and FE. The air is sourced near the exhaust manifold -- in Winter, this helps keep the intake air within ranges that are more efficient, and gets that sensor input better suited for the ECU's decision for most efficient operation. I've found my engine to operate most efficiently at 90-110F IAT. Nearly all manufacturers (and sometimes between different models) react differently to this mod. It takes some testing...

As far as heating the intake, I'm not sure if that would net you significant gains, as the rest of the vehicle's components have to 'warm-up' as well...

RH77

__________________
“If we knew what we were doing, it wouldn't be called research” ― Albert Einstein

_
_
  Reply With Quote
Reply  Post New Thread


Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
glow plug based coolant heater Coyote X EcoModding Central 23 09-11-2018 07:36 AM
2003 Toyota Matrix Block Heater Daox EcoModding Central 25 11-03-2012 09:59 AM
Winter mod - heater blower integrated with engine kill switch MetroMPG EcoModding Central 3 12-31-2007 11:31 PM
850 watt tank style coolant heater - installed in the Blackfly MetroMPG EcoModding Central 4 11-28-2007 03:10 PM
Trying out an aftermarket Intake on a VX TomO EcoModding Central 0 11-14-2007 04:41 PM



Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2021, vBulletin Solutions Inc.
Content Relevant URLs by vBSEO 3.5.2
All content copyright EcoModder.com