[03_StangGuy]

Originally Posted by mustanginky how the hell would mmr know what rpm range you took it up to? they have no way to prove or disprove that without some sort of electronic device on your car. from all my research, you want to introduce lots of engine breaking and lots of varying rpm/loads to give the rings a chance to seat. don't beat the heck out of it IMO but take it up to high rpm's with moderate load, and get on it alot at low rpm's.

It would be tough to prove an new engine failure either way. I would think that reason to break and engine in and take it easy at first is to make sure everything is working properly. From a dealer a brand new car or bike has been tested to run and brand new engine us different.

Ive read the same thing bout engine break in. Seems like 3-4k rpm pulls with 50-75% throttle are what most people will say.

Originally Posted by mustanginky put fresh dino oil in it off the bat, change it after your initial drive (maybe 5-7 miles of varying rpm and stop and go), drive about 150 more, change the oil, drive 1000 and change it. i'm about to change mine here shortly and i've got around 700 miles on it.

I think 5-7 miles is a little ridiculous. Its not the oil getting dirty so much as the oil filter. Even still 5-7 miles is barely anything. I did my initial breakin/tuning and changed the oil bout 150 miles, then 500 and 1000, all regular dino oil. Proceeded with regular oil changes after that.

[MacDizzle]

Lol ya, I wanted to do this but im being farely nice to my 4.75 from MMR for warranty purpose. But the last person I knew that rebuild his engine, he broke it in by boot fucking the thing for days doing burnout, doughnuts, Linelock burnouts lol, Yet i have to baby my Terminator block and racing pistons for ever? lol I guess if MMR says play nice thats what ive got to do.

Originally Posted by CobraStang161 personally i have found the best way to break in a motor is beat the ever loving piss out of it. Have done that with all my motors i built and they are all running strong to this day

[saxmanJJ]

Originally Posted by dhicks7806 Hey saxman how's your motor holding up after that break in? Run like a raped ape? Have any blow by issues? The only thing I ever to "baby" my motors was keeping boost relatively low for about a 1,000 miles but even that may not be necessary after the rings are seated fully... Sent from my Autoguide iPhone app

After I left the mechanic's place, I beat on it for about 10 minutes so that I could uncover any problems right away. I'd rather break something with 5 miles of the mechanic shop than 3 months later.

I did change the oil right afterwards with dino oil.

Took it to the track that weekend and ran low 12s (trying to get used to the new clutch and flywheel).

Ran 11.49 at 121MPH as a best.
It pulls hard enough (for now).

[CobraStang161]

Originally Posted by MacDizzle Lol ya, I wanted to do this but im being farely nice to my 4.75 from MMR for warranty purpose. But the last person I knew that rebuild his engine, he broke it in by boot fucking the thing for days doing burnout, doughnuts, Linelock burnouts lol, Yet i have to baby my Terminator block and racing pistons for ever? lol I guess if MMR says play nice thats what ive got to do.

Just ninja it, youll be fine

[slow02gt]

for warranty purposes? isnt mmr's warrant 1 yr no questions asked? so that means who cares lol....your not going to break in an engine just cruising it under 3k-4k rpms...needs rpms and a lil heat to get rings seated properly

[03_StangGuy]

Originally Posted by slow02gt for warranty purposes? isnt mmr's warrant 1 yr no questions asked? so that means who cares lol....your not going to break in an engine just cruising it under 3k-4k rpms...needs rpms and a lil heat to get rings seated properly

Cruising is HORRIBLE for a breakin!! But running up to 3-4K rpm at 50-75% throttle will give you plenty of pressure to seat the rings.

[slow02gt]

Originally Posted by 03_StangGuy Cruising is HORRIBLE for a breakin!! But running up to 3-4K rpm at 50-75% throttle will give you plenty of pressure to seat the rings.

correct