Hey Guy I just rebuilt my motor new bearings (rod and main) new piston and rings water pump head gasket etc................ I was wandering how Long should I break-in my engine before i can WOT it??? Thankx

 

about 500-1000 miles of normal driving...

 

break it in on a dyno..

 

http://www.importbuilders.com/breakin.html

 

1000 miles good to go

 

Beat the crap out of it once you get the motor in.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by .nate &raquo;</TD></TR><TR><TD CLASS="quote">Beat the crap out of it once you get the motor in.</TD></TR></TABLE>
ummmmm........

 

yeah you need to take it to a dyno asap

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by athoughts &raquo;</TD></TR><TR><TD CLASS="quote">yeah you need to take it to a dyno asap</TD></TR></TABLE>

the dyno is the best way to break in a motor. the whole "let it idle for a whole day" or "take it easy for 1500 miles" is a myth. if you dont have access to a dyno, rev the motor up and fluctuate rpm speeds and do not let it go below 1500 rpm. after the motor is warmed up, rip it up and down the street several times, change the oil and you're done! good luck!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Matt5745767 &raquo;</TD></TR><TR><TD CLASS="quote">
ummmmm........</TD></TR></TABLE>

ummmmm get educated before you run your mouth. We break in motors all the time like this.

DO get to a dyno and get it tuned though

 

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by AllMotorRandy &raquo;</TD></TR><TR><TD CLASS="quote">

the dyno is the best way to break in a motor. the whole "let it idle for a whole day" or "take it easy for 1500 miles" is a myth. if you dont have access to a dyno, rev the motor up and fluctuate rpm speeds and do not let it go below 1500 rpm. after the motor is warmed up, rip it up and down the street several times, change the oil and you're done! good luck! </TD></TR></TABLE>



My motor which most here have seen (over 10,300 miles on her now and 350 dyno pulls)
was taken to 9000 rpm withing 4 miles of driving and dynoed the next day..
I'm now a firm beliver in the beat it like you stole it method(as long as your first few trips your making the nessasary fuel adjustments needed)
I will note that I run gas ported pistons though.

 

I kind of mixed up the hard/easy breakin on my motor. Within a few miles, I had taken it to about 6k (mostly because I was so excited, being without a car for 8 months). I wouldnt beat on it all the time, but probably once a day or so.

I'm now approaching 7,000 miles with zero problems.

 

beat on it.. I did and it works. I choose to stay off the interstate for the first 1000 miles to be sure to vary the rpms.

 

dont the cylinder walls only have like a few min o roughness to wear down the rings to the cylindrs right?

 

i drove the car for 50 miles and then did wot pulls until 5k and let it coast basically let the rpms come down to slow the motor down, did that about 3-4 times to give the motor some load and so far it doesnt smoke but im not done with tuning so cant really comment.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by projectTeG &raquo;</TD></TR><TR><TD CLASS="quote">dont the cylinder walls only have like a few min o roughness to wear down the rings to the cylindrs right?</TD></TR></TABLE>

it take very little time for the rings to seat..... rev it up to like 4k and hold it for a few min

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Tbone &raquo;</TD></TR><TR><TD CLASS="quote">



My motor which most here have seen (over 10,300 miles on her now and 350 dyno pulls)
was taken to 9000 rpm withing 4 miles of driving and dynoed the next day..
I'm now a firm beliver in the beat it like you stole it method(as long as your first few trips your making the nessasary fuel adjustments needed)
I will note that I run gas ported pistons though.</TD></TR></TABLE>

I did the same with my engine. Built it myself, broke it in hard. Still was making awesome power when the head was removed to upgrade the valvetrain and do some other upgrades.

 

looks like i will be do n a hard break n as well. i guess i'll do the hard break n while im street tuning the car with uberdata after i rebuild it. i was gonna do the slow 500 mile break in but after reading this i think im gonna do a hard break in

 

http://www.hastingsmfg.com/Ser...e.htm

BREAK-IN PROCEDURE
1. Make a test run at 30 miles per hour and accelerate at full throttle to 50 miles per hour. Repeat the acceleration cycle from 30 to 50 miles per hour at least ten times. No further break-in is necessary. If traffic conditions will not permit this procedure, accelerate the engine rapidly several times through the intermediate gears during the check run. The object is to apply a load to the engine for short periods of time and in rapid succession soon after engine warm up. This action thrusts the piston rings against the cylinder wall with increased pressure and results in accelerated ring seating.
2. Following the breaking-in, turn the vehicle over to the owner or operator with the following suggestions:

PASSENGER CAR AND LIGHT TRUCK
Drive vehicle normally but avoid sustained high speed during the first 100 miles

if you do not have a wideband O2 sensor or a way to tune your vehicle upon startup you should go to a dyno. if you feel that you dont want to run your motor into higher RPMs until you put more miles on it then get it tuned for narrow throttle settings and then drive within those parameters.