Just put in another built motor this time with a few changes from my previous set up and was wondering what most of the other built motor guys used as break in mileage. I am sitting at 450 miles right now, put that on it over the last couple weeks. The motor hasnt seen over 2500 RPM's yet....The oil looks good and so far no problems. I know some tuners will dyno them shortly after the build with just 100 miles or so. I am not planning on running it until it gets warmer but just curious how long I should go easy on her....Thanks in advance.

550 RWHP
Built motor
KB, CAI
JLP upper plenum
Fuel upgrades
Headers

 

According to VT:
10-15 miles at less than 3500 rpm, change oil and filter.
500 miles at less than 3500 rpm, change oil and filter.
Another 500 miles with some slightly higher rpms for brief periods then change oil and filter.

Use only non-synthetic oil.

I will follow their recommendations when I do the install of my VT LB.

 

My JDM Long Block was at the track with about 10 miles on it. Ran a 10.90 its first pass. I say break it in like you are going to use it. -Mat-

 

ditto mine has about 3k miles on it over the last year and almost all are hard miles

 

Hey Latemodel.....When are you gonna get some time to come up to Florence. Someone from Jasper came up a couple weeks ago for a little action, he was in a black LS1 Z28...it ran pretty good. My truck was broke and I didnt get a shot at him but several others did. If yall come up we could get several together for some good racing....

 

I had my last built motor put in around March. It still doesn't have 500 miles on it. It has maybe 20-25 passes...at most. I haven't actually driven it on the street. Maybe I should...LOL.

The motor before that one I did the 500 mile break in bit. I don't know that it made any difference. Maybe you should ask the folks that built the motor.

 

God Bless you Bro how you made 500 miles without going over 2500 RPM is something I sure couldnt do : o ()

I'm going along with "DRIVE IT LIKE YOU STOLE IT"

I think the most important thing to do on any new motor is NOT stay at the same RPM for prolonged periods. As said ""you need to"" go to higher RPM's even if only for short periods. A few hundred miles is enough for any motor in my opinion. Mercedes Benz seems to agree cause on my SRT8 370 cu in Hemi they tell you to drive it normal "from day one" and after 300 miles it's completely broking in and you can drive it as hard as you like, WOO HOO

I LISTENED

 

the mileage thing is bs. all you really need is two or 3 heat cycles. 1st startup let it idle til it reaches operating temp. 2nd startup either on a dyno or on the street keep it below 3000 rpm's for about 10 mins. after it reaches temp then let it completly cool down. 3rd step repeat step 2 but you can increase rpm's after it reaches temp. run it for 5-10 mins varying rpm. let it cool completly down.

if the rings and seals aren't seated after that than you have some issues with the build. i highly doubt you'll get any different results by driving it 3-500miles. now if you replaced a ring gear than i would follow the 3-500mile rule.

 

God I love watching you Dyno Vid RDY2RAC

 

thanks, the next pull was the one i really wanted to put up but i ran outta room on my memory stick. i've got a few new things coming in the next month or so.

 

LIKE WHEELIE BARS A PARACHUTE I HOPE

 

What I suggest for my motors and trucks I put them in is this... About 500 miles break in, then change oil and filter. Use only crude oil, until 3000 miles, then switch to synthetic if desired. During that 500 miles, no WOT, but hitting low boost levels for short periods is fine. I want the motor to go through a variety of rpm situations. Just no WOT because it's not tuned yet. After 500 miles, change the oil, then dyno tune it. I will usually do the 500 mile break in for the customer before giving the truck back.

I like 500 miles because it gives you the chance to "feel" the new motor before you flog the crap out of it. This way if there are any minor issues with the build, you can find them and take care of them at that point. To put a fresh motor in and hammer it from the get go is really stupid in my opinion. The smallest issue that could have been caught and fixed during breakin, could now wipe out the entire motor the first time you try to push 700 hp through it.

Just my veiws, obviously other people have their ways of doing it.

 

Thanks for the input guys. Several different opinions and logic, thats why I asked on here instead of getting one opinion from any builder.

My motor is a hybrid anyway, JDM heads and cams, JLP bottom end and Several PSP products under the hood.

I was just curious what all you other guys did and how it worked out. I drove it in town, on the highway, both slow and fast with less than 5 psi. I know that JDM puts a Break in tune on fresh motors. From experience JLP puts 50-100 miles on it before the dyno run and then a couple hundred miles before you come and get it. I dont know how aggressive the tune is he didnt say anything about changing it after driving it more.

Thanks for your input SAL, I think we all enjoy the fact that you take time to visit us here and help out when you can.

 

No problem, I am here to help.

 

You can't go wrong with that advise.
Worth checking with the main vendors / tuners involved with your project.

BTW Happy New Year Sal.

George sends his regards to