Go Back   EcoModder Forum > EcoModding > Hypermiling / EcoDriver's Ed
Register Now
 Register Now
 

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 07-29-2013, 09:11 AM   #1 (permalink)
In the slow lane
 
songman's Avatar
 
Join Date: May 2013
Location: Southern England, UK
Posts: 47

Civic Type R - '08 Honda Civic
90 day: 38.19 mpg (US)
Thanks: 0
Thanked 9 Times in 6 Posts
Red lining

Hardly a topic for a hypermile forum, I grant you.

I googled the consequences of redlining an engine, and one forum response suggested that the occasional foray into the red actually helped the engine, preventing the build up of carbon deposits. Opinions on this?

I've never done it, and with a red line at 8K and an average rpm of 2K I'm not likely to, but I'm curious. Is it simply a case that incursion over the line simply cuts the engine until revs fall below, at which point the throttle reengages? Is no damage caused?

  Reply With Quote
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 07-29-2013, 10:23 AM   #2 (permalink)
EcoModding Lurker
 
Join Date: Feb 2013
Location: Montreal
Posts: 29

2013 Matrix 2ZRFE - '13 Toyota Matrix
90 day: 38.48 mpg (US)
Thanks: 6
Thanked 3 Times in 2 Posts
I would think that it is plausible.
It is as plausible as those Fuel treatment, injector cleaner and all those products in a bottle that promise 30% increase in fuel economy.

It may work a little bit, but it is not worth to even try.
  Reply With Quote
Old 07-29-2013, 11:07 AM   #3 (permalink)
In the fasting lane
 
RedDevil's Avatar
 
Join Date: Dec 2012
Location: Nieuwegein, the Netherlands
Posts: 3,645

Red Devil - '11 Honda Insight Elegance
Team Honda
90 day: 51.36 mpg (US)

It - '09 Hyundai I10 Active Cool
Team Hyundai
90 day: 30.58 mpg (US)
Thanks: 1,456
Thanked 1,987 Times in 1,273 Posts
I doubt it, but what does work is the long trip for the short commuting car to get it hot every once in a while.
When you only do short trips the engine never gets hot. Over time some water may get into the oil from the vapour in the exhaust gas escaping through the gap in the piston rings.
High water content wil turn oil into a buttery slush, raising internal resistance and possibly blocking lubrication.
Taking that long trip will effectively boil the water out of the oil. Use grill blocks to speed up the process
__________________
2011 Honda Insight + HID, LEDs, tiny PV panel, extra brake pad return springs, neutral wheel alignment, 44/42 PSI (air), PHEV light (inop), tightened wheel nut.
lifetime FE over 0.16 Gmeter or 0.1 Mmile.



Most people are in the longest queue.
  Reply With Quote
Old 07-29-2013, 11:11 AM   #4 (permalink)
Master EcoModder
 
cbaber's Avatar
 
Join Date: Feb 2012
Location: Missouri
Posts: 540

Lean and Mean - '98 Honda Civic HX
Team Honda
90 day: 46.69 mpg (US)
Thanks: 30
Thanked 190 Times in 110 Posts
It's perfectly safe to allow the car the redline occasionally. The redline is determined by where the engine develops its peak HP, and the mechanical limits of the drivetrain. Most cars employ a rev limiter, which cuts fuel beyond a certain RPM, usually a couple hundred RPM after the redline. This is a safety feature that will not allow the engine to rev beyond its limits to prevent damage.

As far as cleaning out carbon, I would argue that you don't really need to go all the way up to redline to accomplish the goal. A few brisk accelerations up to about 60-75% of the rev range will work just as well. There are plenty of products like seafoam that are designed to do the same thing, without potential damage to your engine.
__________________
1998 Honda Civic HX - My Project Thread

  Reply With Quote
Old 07-29-2013, 11:22 AM   #5 (permalink)
Eco-ventor
 
jakobnev's Avatar
 
Join Date: Oct 2010
Location: sweden
Posts: 1,221

Princess - '92 Mazda MX-3 GS
House of Tudor
Team Mazda
90 day: 53.54 mpg (US)
Thanks: 51
Thanked 420 Times in 265 Posts
Send a message via MSN to jakobnev
I like to think it does good, that way i don't feel bad about hitting 65MPH in 2nd every now and then when i have a highway onramp to myself.
__________________




2016: 128.75L for 1875.00km => 6.87L/100km (34.3MPG US)
2017: 209.14L for 4244.00km => 4.93L/100km (47.7MPG US)
  Reply With Quote
Old 07-29-2013, 04:13 PM   #6 (permalink)
EcoModding Newb
 
redpoint5's Avatar
 
Join Date: Aug 2010
Location: Oregon
Posts: 7,518

Acura TSX - '06 Acura TSX
90 day: 28.07 mpg (US)

Lafawnda - '01 Honda CBR600 F4i
90 day: 47.32 mpg (US)

Big Yeller - '98 Dodge Ram 2500 base
90 day: 21.82 mpg (US)

Prius Plug-in - '12 Toyota Prius Plug-in
90 day: 57.64 mpg (US)

Mazda CX-5 - '17 Mazda CX-5 Touring
90 day: 23.74 mpg (US)
Thanks: 2,452
Thanked 2,957 Times in 2,194 Posts
My uneducated opinion is that it will do little good, but couldn't hurt. I've hit the rev limiter on my car a few times at around 7,500 RPM. Maybe I average once per year. There is never a need to go all the way to the limiter though, unless you're racing.

It is possible to go over the limit in a manual transmission by shifting into a low gear while traveling too fast for that gear. I've never done it, but I'm sure someone has. It goes without saying, this could cause catastrophic damage to the engine.
__________________
Gas and Electric Vehicle Cost of Ownership Calculator







Give me absolute safety, or give me death!
  Reply With Quote
Old 07-29-2013, 10:29 PM   #7 (permalink)
Master EcoModder
 
Join Date: Aug 2010
Location: Philippines
Posts: 2,169
Thanks: 1,728
Thanked 582 Times in 399 Posts
It doesn't hurt, but it's not necessary. Just a few runs up into the powerband every once in a while helps keep the engine clean.
  Reply With Quote
Old 07-30-2013, 08:55 AM   #8 (permalink)
In the slow lane
 
songman's Avatar
 
Join Date: May 2013
Location: Southern England, UK
Posts: 47

Civic Type R - '08 Honda Civic
90 day: 38.19 mpg (US)
Thanks: 0
Thanked 9 Times in 6 Posts
Quote:
Originally Posted by niky View Post
Just a few runs up into the powerband every once in a while helps keep the engine clean.

So is constant relatively low revving actually bad for the engine? I rarely cruise beyond 2200 RPM, and almost never go beyond 3000.
  Reply With Quote
Old 07-30-2013, 10:30 AM   #9 (permalink)
In the fasting lane
 
RedDevil's Avatar
 
Join Date: Dec 2012
Location: Nieuwegein, the Netherlands
Posts: 3,645

Red Devil - '11 Honda Insight Elegance
Team Honda
90 day: 51.36 mpg (US)

It - '09 Hyundai I10 Active Cool
Team Hyundai
90 day: 30.58 mpg (US)
Thanks: 1,456
Thanked 1,987 Times in 1,273 Posts
I expect that if revving does get rid of deposits and such, there would be evidence around of engines that weren't revved and have that kind of buildup.
Anyone seen that?

I'm willing to believe that the occasional revving helps the engine, just want to understand exactly what's happening.
__________________
2011 Honda Insight + HID, LEDs, tiny PV panel, extra brake pad return springs, neutral wheel alignment, 44/42 PSI (air), PHEV light (inop), tightened wheel nut.
lifetime FE over 0.16 Gmeter or 0.1 Mmile.



Most people are in the longest queue.
  Reply With Quote
Old 07-30-2013, 10:44 AM   #10 (permalink)
EcoModding Lurker
 
Join Date: Feb 2013
Location: Montreal
Posts: 29

2013 Matrix 2ZRFE - '13 Toyota Matrix
90 day: 38.48 mpg (US)
Thanks: 6
Thanked 3 Times in 2 Posts
Actualy yess, I have seen it. There is a groove of carbon deposit at the top of the block cilinder. But it's there because the piston rings don't travel to the very edge of the block. Going 7000 rpm instead of 2000 will not bring the piston closer to the edge so is will not change anything.

I have found that picture online, it is not accurate since the rest of the block is just too clean but it represent where it is. Usualy the groove is smaller than that and form a powder when removed.

  Reply With Quote
Reply  Post New Thread


Thread Tools




Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2020, vBulletin Solutions Inc.
Content Relevant URLs by vBSEO 3.5.2
All content copyright EcoModder.com