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Author
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Topic: How many miles
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Clevo377
Gearhead Posts: 255
From: Blackburn, Victoria, Australia
Registered: Nov 2000
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posted 01-09-2002 06:02 AM
   
do you guys (and gals) do on the non-friction modified oil when running in a new engine?Paul
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Just Strokin
Gearhead Posts: 179
From: Tuscaloosa, Alabama
Registered: Dec 2001
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posted 01-09-2002 07:26 AM
Are you referring to a non-detergent oil that many use to use when they first rebuilt an engine?Now days, I put the oil I am going to run in it and then change it around 750-1500Kms (500-1000 miles) the first time. You definately don't want to break in the motor with synthetic oil from what I read. But, I have never run any, so, I don't know for sure on that.
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Dave_C
Gearhead Posts: 432
From: Gadsden, Al
Registered: Aug 99
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posted 01-09-2002 10:42 AM
The last time I freshened my engine I switched from regular to Total Seal gapless (2nd) rings. They said to run them either 25 drag passes or 500 street miles before switching from regular oil.I ran it on straight 30W non detergent for the 25 passes (and return road trips + warm ups etc) then switched to Mobil 1 synthetic. No problems, good ring seal since. Later, David Cole
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blown 351
Journeyman Posts: 31
From: Seattle, Wa. 98258
Registered: Dec 2001
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posted 01-09-2002 04:08 PM
consider that whatever oil you break the engine in with will be changed at what?? about 300-500 miles??
I used a detergent 30 weight and ran it pretty hard after the initial 30 minutes of running/tuning. Take it out and get the rings to bite into the walls and seal.
Why spend the money to just throw away fiction modified oil after 500 break-in miles? The initial oil is going to wasted with metalic particles anyway. Use a very high quality oil filter, then chuck it whenyou change the break-in oil. (Cut it open and run a magnet through it if you're interested.)
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Clevo377
Gearhead Posts: 255
From: Blackburn, Victoria, Australia
Registered: Nov 2000
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posted 01-11-2002 04:59 PM
Thanks.
Paul
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kid vishus
Gearhead Posts: 1994
From: huh?? what? who? ME!?!?!?!
Registered: Oct 2000
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posted 01-11-2002 05:05 PM
I break my race motors in while in the garage. Normally run them about 30-45 minutes varying the rpm and even running them in gear against the brakes to load the motor. I then dump the petroleum oil and put synthetic in. It might not be enuff actuall run in time, but it seems to work for me.
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74merc
Gearhead Posts: 727
From: Demopolis AL
Registered: Jun 99
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posted 01-14-2002 03:12 PM
doesn't it need to be under load while broken in?
the cam has to start a polish or wear pattern, thats the initial breakin, but it needs pressure against it to build combustion pressure to force the rings to seat, right?
seems like no matter how long it ran free it wouldn't seat the rings properly...
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Moneymaker
Administrator Posts: 11493
From: Lyons, IL, USA
Registered: May 99
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posted 01-15-2002 12:53 PM
We dyno on petrolium. Break in then change to clean, Royal Purple or Castrol. Then we make 3 part to full passes ont he same dyno oil. Cut open the filter, look at the drained oil, and if all is well (which is always is  )then install the Royal Purple synthetic product and run all season.
125+ 9000 RPM passes on mine and 150+ 6400 RPM passes on Tony's per year with Royal Purple. Bearings and rings look brand new everytime.  ------------------
Alex Denysenko
Co-Administrator and Moderator
NHRA/IHRA/SRA member
NHRA and IHRA SS/LA National Record Holder '00, '01, & '02
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Part time secret agent license #0089
US Class Nationals link
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