Busting The Engine Break In Myth | MC Garage

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  • Published on:  Monday, November 12, 2018
  • How to break-in a new engine is an extremely contentious topic. In this video from the MC Garage we bust the engine break-in myth by building up two engines, breaking them in using drastically different methods, and then tearing them down and comparing the components at the heart of the discussion.

    Engine Break-In Specs

    Engine 1, “By The Book Break-In”
    Installed at 1,828 miles, removed at 2,861 miles
    Break-In Notes: Ridden gently. Didn’t exceed 50% throttle or 5,000 rpm for the first 600 miles, and didn’t exceed 75% throttle or 7,000 rpm until 1,000 miles. Didn’t experience WOT until 1,000 miles was accumulated. Ridden with constantly varying engine speed and load, no easy task on a slow bike in a busy, urban environment! Oil and filter changed at 600 miles.
    Piston OD: 2.9910” at install, 2.9910” after 1,000 miles
    Cylinder ID: 2.9925” at install, 2.9930” after 1,000 miles
    Top Ring End Gap: 0.0130” at install, 0.0145” after 1,000 miles
    Compression: 235 psi hot after 1,000 miles
    Leak Down: 4% hot after 1,000 miles




    Engine 2, “Brutal Break-In”
    Installed at 2,861 miles, removed at 3,890 miles
    Break-In Notes: Went to WOT within moments of first starting up, and was ridden hard for 1,000 miles. Did everything we’re told not to—lots of throttle and high-speed droning at steady throttle. Oil and filter changed at 600 miles.
    Piston OD: 2.9910” at install, 2.9910” after 1,000 miles
    Cylinder ID: 2.9925” at install, 2.9930” after 1,000 miles
    Top Ring End Gap: 0.0130” at install, 0.0150” after 1,000 miles
    Compression: 235 psi hot after 1,000 miles
    Leak Down: 4% hot after 1,000 miles


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  • Source: https://youtu.be/xpoglovyy_8
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Comment

  • Cosmonauteable

    Cosmonauteable

     yesterday

    Dude what the fuck have you been doing

  • Pacificbaitchunk

    Pacificbaitchunk

     2 days ago

    Similar story from Charles Lindbergh during WW2 in the pacific the fighters had a limited range. He figured out he could run much leaner F/A ratio and not damage the cylinders like Pratt an Whitney said they would an extended range by 200 miles for our fighter planes. Called "running lean of peak"

  • Octavius Maximus

    Octavius Maximus

     3 days ago

    That Honda CB 300F looks very similar to my Honda CB 250 TWISTER. (not sold in the U.S Market)

  • Kelly Farina

    Kelly Farina

     4 days ago

    Get well soon mate.

  • Rearm

    Rearm

     4 days ago

    Well i got my new bike but before i can get it home they warm it up then red rev line it for 10 secs damn

  • Ovi H

    Ovi H

     5 days ago

    Get well soon...bro..

  • Neito Kradavish

    Neito Kradavish

     6 days ago

    Did you have the oil analyzed? That would tell you if one engine had more or less of a certain material (ring, piston, cylinder wall, bearing etc.) and be a more accurate measurement of wear. Just curious.

  • Parabola

    Parabola

     6 days ago

    Dang you looked like you got fucked up

  • Not Vladimir Putin

    Not Vladimir Putin

     7 days ago

    Thx.

  • acdii

    acdii

     7 days ago

    This is so true with all modern day manufactured engines. The manufacturing has become so precise that tolerances are nearly identical from one engine to another, machining has improved so much that parts no longer need to wear in. The only ting that does need to be done correctly is to seat the rings, which is done in the first few miles, or in some case, on the assembly line before the engine is even installed. What DOES need to be properly broken in, not so much on a bike, but in cars and trucks is the transmission and final drive. Ring and pinion do need to be broken in properly of they would get abnormal wear patterns, become noisy and eventually fail. Same goes for manual transmissions, yes kids, they do exist. Overall, I am really glad this video was made, it backs up what I have been saying for years. Just drive it! If it's gonna break, it will break no matter how you drive it from the start. The only exception to this rule would be hand built performance engines that don't use factory parts.

  • Dave Tyler

    Dave Tyler

     14 days ago

    Perryman333 I don’t know where you get your air bubbles but where I get mine they’re made out of the foil seal on oil bottle!
    Weird aye!

  • Brian Stewart

    Brian Stewart

     14 days ago +1

    Great video. Well done. Thank you for taking the time to put this together.

  • Rick Carrarini

    Rick Carrarini

     21 days ago

    When was the last time you saw a pro-stock engine get babied for the first 600 miles?

  • Anthony Moore

    Anthony Moore

     21 days ago

    Awesome video! I’ve always wondered about this and great to have it definitively answered! I’m happy to say that what I suspected to be true was in fact true.

    Omg your injury! I’m sorry to hear!!! 😕

  • puddingbrood

    puddingbrood

     21 days ago

    is this different with 2 strokes ?

  • Bert Style

    Bert Style

     21 days ago

    I knew it..........!!!!!

  • Peter Don't worry

    Peter Don't worry

     21 days ago

    Hard core, after been deshackled for 25 years and want to get my 'Trident' 75 T160 out of moth balls ( depending on what parts are still and are not, mind) I crack on to ya chan, and now ya f.....g off? Nah, bullpiss asside, onya cobber, all the very best and 'I' have no doubt that not only ya neck will be curly swish, whatever you sink ya teeth into next, will be 'Just' as curly. Respect chur

  • LJ Garrison

    LJ Garrison

     21 days ago

    Just do what the manual says - simple. The engineers know how to correctly to break in an engine - as all of the other things have to break in at the same time!
    Also, you have to compare after 10k/20k miles also, as the damage of a hard break in won't show for a few years.

    Edit: Good test though.

  • Sai Ram

    Sai Ram

     28 days ago

    Why???? Take care bro and have a great ahead

  • Eleven X

    Eleven X

     a months ago

    haha, you totally just put foil into your engine. 😂😂😂 4:51