Breaking in a new engine - Fuelly Forums
Thread Tools Display Modes
Old 05-20-2008, 04:23 PM   #1
Registered Member
Kuripot's Avatar
Join Date: May 2008
Posts: 52
Country: United States
Breaking in a new engine

I'm driving a new Hyundai Accent and trying to break it in correctly. The first tank of gas was used primarily around town and when i did take it on the highway I tried to vary my rpms as much as I could. On the second tank I was using it for my 35 mile trip to work every day and haven't been varying the rpms much. What is the concept behind varying rpm and how does that improve the break-in process on an engine? I read where keeping the engine at a constant rpm during break-in can glaze the cylinder walls and keep the rings from seating properly. Is that everybody elses understanding?

The manual suggests keeping rpms between 2000-4000. Sixty mph is at about 3000 rpms and where I like to drive it on the interstate for the best mileage. I guess I should be running it up to 75 mph and back down to 60 occasionally. That's pretty annoying to other drivers for the first 1200 miles. LOL

2008 Hyundai Accent Manual Trans.
Kuripot is offline   Reply With Quote
Old 05-20-2008, 04:45 PM   #2
Registered Member
GasSavers_RoadWarrior's Avatar
Join Date: Feb 2008
Posts: 1,652
Way I understand it is, you have to load both sides of the rings, acceleration at about 3/4 throttle to modest revs, then engine brake it down to a slower speed again, highest gear that has you at legal speeds. Doing that 30-40 times is meant to be optimal with modern ring packages, before changing oil then settling into steady speed light throttle useage for 2K to glaze them off.

I remember The RoadWarrior..To understand who he was, you have to go back to another time..the world was powered by the black fuel & the desert sprouted great cities..Gone now, swept away..two mighty warrior tribes went to war & touched off a blaze which engulfed them all. Without fuel, they were nothing..thundering machines sputtered & stopped..Only those mobile enough to scavenge, brutal enough to pillage would survive. The gangs took over the highways, ready to wage war for a tank of juice
GasSavers_RoadWarrior is offline   Reply With Quote
Old 05-20-2008, 05:49 PM   #3
Registered Member
kamesama980's Avatar
Join Date: Nov 2007
Posts: 742
Country: United States
Location: Columbus, IN, USA
Send a message via AIM to kamesama980 Send a message via Yahoo to kamesama980
if you've gone through a tank already, don't worry about it. it's too late. IIRC 80% of engine break in takes place in the first 50 miles, and it's like 95% by 150. that's ring break in. the 1200 mile take it easy break in is because of lawers. yes, load it down good and hard from medium-low rpm to fairly high rpm (ie, get in high gear and go from 2k to 5k). I used to have a link to a site of a guy that did motorbike engine building (2 and 4 cycle) for like 30 years and developed his own break in regime that dynod 10-15% better hp and mpg than the mild-moderate break ins. overall, just let it warm up then drive it hard the first 200 miles without lugging, redlining, or going a steady speed.
1991 Toyota Pickup 22R-E 2.4 I4/5 speed
1990 Toyota Cressida 7M-GE 3.0 I6/5-speed manual
mechanic, carpenter, stagehand, rigger, and know-it-all smartass
"You don't get to judge me for how I fix what you break"
kamesama980 is offline   Reply With Quote
Old 05-20-2008, 06:14 PM   #4
Senior Member
BumblingB's Avatar
Join Date: Feb 2009
Posts: 341
Country: United States
Location: NW Florida
I posted a few weeks ago and got mention I wasn't breaking my car in properly. I did say I that I hung in certain MPH range so that may be where that was taken from, we never talked about it much more. It did start quite the discussion about different break-in methods. I've always leaned towards kamesama980's way - did I mention I've owned over 100 cars? Many of which I built the motors for (I come from a car family, auto parts, machine shops, gas stations, body shops, performance shops etc - everyone owns something)

(the thread is here, it was about my new smart)
BumblingB is offline   Reply With Quote

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Incorrect Milage Calcuatlion PatM Fuelly Web Support and Community News 4 07-17-2009 07:21 PM
ECT Analyzer/manual TC lockup GasSavers_Bruce Transmissions and Running Gear 60 04-01-2008 10:37 AM
How far do you drive daily? OdieTurbo General Fuel Topics 56 03-31-2007 01:49 AM
State of the Union address touches on "oil addiction." Matt Timion General Discussion (Off-Topic) 31 02-06-2006 03:38 PM
vegpowered systems GasSavers_Diemaster Vegetable Oil and BioDiesel 2 09-08-2005 04:53 PM

Powered by vBadvanced CMPS v3.2.3

All times are GMT -8. The time now is 06:15 AM.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2016, vBulletin Solutions, Inc.