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after an engine overhaul

Discussion in 'The Garage' started by aknight_sa, Oct 27, 2005.

  1. aknight_sa

    aknight_sa 1/2 ton status

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    hi guys,

    i just finished an engine overhaul, my question is... how long do i have to give it before i can go offroad again???
     
  2. BIG*RED

    BIG*RED 1/2 ton status

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    i wouldn't untill it was fully "broken in"

    when i put the brand new crate motor in my k5, i waited for at least a 1000 miles before i went romping on it, and taking it off road.
     
  3. Cornfield creations

    Cornfield creations 1/2 ton status

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    I babied my 327 when I built it, until about 1000 miles. Then someone told me that you should break it in the way you are gonna drive it. Does anyone else agree with that?
     
  4. Robert D

    Robert D 1/2 ton status

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    With the Porsche's I grew up wrenching on and paying to have wrenched on I've heard different opinions... Some people say to 'break-in' the motor by driving low-speeds and not being too aggressive for a thousand to two-thousand miles. Other resources have told me to just drive the stink out of it and that break-ins don't matter. When we rebuilt the 912E motor for the third time (2 ruined camshafts from webcams) we tracked it the next day and it still runs perfectly fine now....so I still have no clue... :confused:
     
  5. aknight_sa

    aknight_sa 1/2 ton status

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    what do you mean by "breaking it in" ???

    some people here told me to drive it for a 1000km then i can go offroad..

    the mechanic who did the engine said the same plus he asked me to bring it back so he can balance the volves..

    another guy said he overhauled his engine twice (once every 230,000 miles) and he didnt do what was told.. he drove it the same day on a freeway on a speed of 120miles/hour..
     
  6. pauly383

    pauly383 Daddy383 Staff Member Moderator

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    People believe different things , myself included . I personally believe you just drive it normally without romping on it for 500 miles . Then change the oil and drive it normally from then on out .
     
  7. Robert D

    Robert D 1/2 ton status

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    By "break-in" I mean driving it for ~1000-2000 miles without driving aggressively or taking it to too high a speed.
     
  8. aknight_sa

    aknight_sa 1/2 ton status

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    i cant wait for 1000 miles!!!

    what about during this period... will the engine drive smoothly??

    i am asking alot of dumb questions here.. as i am not use to overhauling engines.. i had two new cars before my Jimmy
     
  9. wildbilzrydn

    wildbilzrydn 1/2 ton status

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    If you ever watch any of those shows on the tube where they build an engine and then "dyno" it, the only run the engine about 20-30 minutes at varying speeds until the cam & lifters break in. Then they do the pulls, and they really romp on it to get the max out of it. I would say based on that that that you need to drive it sanely, but not baby it, for about 1/2 hour and then you should be fine.
    When I did the 350 that was in my K20, I ran it long enough to set the timing, and then I did some hard city driving with it for about 40 min. Everything went fine.
     
  10. theperfectgarage

    theperfectgarage 1/2 ton status

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    Do you know how to break in a cam? that is VERY important.
     
  11. beater_k20

    beater_k20 Banned

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    the first engine i built in any of my drivers, i didnt even break in the cam properly. i let it idle for 20 minutes in the garage, changed the oil and filter, and proceded to give it hell from the get go. looking back it was probably stupid, but i know for a fact that at 50K, when i tore it down to regasket it, the cam and lifters all looked great, as did the bearings. last i knew it had another 20K on top of it without a hiccup. my next one will definitely be broken in by the book. generally they say break the cam in, change the oil and filter, drive 500 mi, change oil and filter again. then 1500 change O&F, then start with 3mo/3000mi changes.
     
  12. JEBSR

    JEBSR 1/2 ton status

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    I always break the cam in properly. After that I drive it the way you normally would drive with one exeption. I keep the RPM's below 4500 for the first 500-1000 miles depending on how tight you set the tolerances when it was built.
     
  13. aknight_sa

    aknight_sa 1/2 ton status

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    how do you break the cam in??
     
  14. Russell

    Russell LB7 Tahoe Status Premium Member GMOTM Winner

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    Right after you finish building the engine, start it up, and run it between 2 and 3 thousand RPM for at least 25 - 30 minutes. Vary the RPMs a bit throughout that time. If you can, do it with full exhaust on. Then, if you hear something starting to knock, or tick badly, you can kill the engine and investigate. Its fine to stop the engine, and start it back up again, but absolutely do not let it idle until after the break in.
     
  15. thfonz98

    thfonz98 1/2 ton status

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    when i went through hell and rebuilt my s10 2.8l i was easy on it for the first 500miles. then change oil.
     

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