what is the best way to break in new motor
#2
Originally Posted by matcount63
i just got done rebuilding a 4.2 how do you break it in and to seat the rings the right way and such
technically 3 warm up periods and the rings should have expanded and contracted enough to seat in. but to set the wear patterns that will take many many miles.. but id suggest some highways trips and set cruise
#3
#4
i have broken in many of my race mx bikes, and also a couple motocycles now and well differant machinces i believe the break in is the same. it takes a couple drives of varying speed. not constant 55 and also dont keep the engine or rpm in any extremes. i would say drive faster then 30 mph ( except where law prohibits of course but try not to stay in the city for a long time) and less then 75mph. dont run at highway speeds the whole time. and when u take off from say a stop light by all means dont baby it! but also dont redline it either. i would say 4k max personally i would try to keep it around 2500-3000 while accelerating on my break in period, after about 3000 miles or 3 months which ever comes first (unless u put on 20 miles in 3 months be reasonable, that ur truck is broken in. if ur going to drive it hard i would still not shert can it everywhere until 8k-10k. i wouldnt haul anything like a decent sized boat til after 5k. my 2 cents from expeirence.
#5
Get out there and floor it! The way to get the rings to seal properly and not burnish the bores is to load the engine down, and the way to do that is to get on it. Babying the engine during breakin is of no value. If something is not right with the engine assembly, babying it will only prolong a bad situation. If it's gonna break, it's gonna break, whether you baby it or not.
Now don't abuse it, but don't be afraid to floor it either.
For more info on breakin procedure and why it is important to load the engine, go to mototuneusa.com, or if that is not the correct site, do a search for that site.
Later, and good luck.
Now don't abuse it, but don't be afraid to floor it either.
For more info on breakin procedure and why it is important to load the engine, go to mototuneusa.com, or if that is not the correct site, do a search for that site.
Later, and good luck.
#7
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we put a rebuilt 390 in a '74 F-100 way back then...
live in mass...
started it up on sat morning hooked up the trailer...
changed the break in oil when we got to oxford planes dragway in maine...
after towing the race car and gear all that way with zero miles on it...
just go for it!
(after all its under warranty)
...zap!
live in mass...
started it up on sat morning hooked up the trailer...
changed the break in oil when we got to oxford planes dragway in maine...
after towing the race car and gear all that way with zero miles on it...
just go for it!
(after all its under warranty)
...zap!
#12
Yeah, definately run it hard (not too hard, mind you), and I personally would run through a semi-urban area with stoplights but a 55MPH seppd limit. That allows you to get in ur stops & Goes, yet allows you to get up to around 60 MPH with no police worries...That's what I've done with my 2 bikes, and they run fantastically.