So, what is the best way to run / break-in a new engine??
Is it a bad idea to start it and just rev it?
Or give it a quick tune and take it for a good run??

20 minutes at 2000 - 2500 rpm to harden the new cam lobes. At that rpm it insures that enough oil splash coats the cam and lifters as they seat and harden. Then change the oil and filter. I saved the oil from my break-in process in a Tupperware container so I could examine all the debris in the oil.

I would run it till it warms up good then let it cool down. I did this about 4 or 5 times. This will ensure everything is broken-in and provides time to reset the valve lash and dial in the timing.

Then you can drive it around.

_________________
Aggressive Ted

http://cid-32f1e50ddb40a03c.photos.live ... %20Swinger


74 Swinger, 9.5 comp 254/.435 lift cam, 904, ram air, electric fans, 2.5" HP2 & FM70 ex, 1920 Holley#56jet, 2.76 8 3/4 Sure-Grip, 26" tires, 25+MPG

Ted's procedure is the right one for the cam. This establishes a wear pattern for the cam, it is not a hardening process. Don't skip cam run in unless you enjoy spending money.

Depending on how tight the engine has been built, you will want to avoid WOT for a period of time, and vary engine rpm for a distance.
If your machinist built the engine tight, go at least 1000 miles without flogging it. If it's a grocery getter build, perhaps 500 miles.

There are those that say, "Drive it like you stole it."
I don't subscribe to that sort of thing.

2¢

CJ

_________________
Part of Tyrde-Browne Racing

I'll add to prime the oil by cranking the engine with the starter but without plug on it so compresion doesn't make it harder tu turn, until you read pressure on your oil press gauge, it should be very quick.
Then put the plugs on and do as the others told you to.
Also I change the oil at 500km, 1000km and then 2000km, then on normal basis.

_________________
Martin Zappettini
1974 Dodge Polara RT 318cu.
1965 Valiant III Coronado Slant Six 6-Pack (soon!!)

Drive it like you stole it

Thats my friend suggested to do, He said leaning idlling too low or just reving the motor can cause glazing on the cylinder walls??
I dont know Im not a mechanic!!

Vary the engine speed in highest gear, from almost a lug to free rev a few times will allow the rings to get enough pressure to seat. Other than that drive sensibly. Five or six times on the lug to free rev will do it.

Richard

_________________
Part of Tyrde-Browne Racing

When first starting and running a new engine, the #1 concern is oil pressure. Prime the oil filter & pump, then crank the engine to see if you can get some pressure.
Have a oil pressure gauge or a known working "idiot light", at the least, so you know that there is pressure.

Once the engine starts & runs, take a quick look for any leaks, then check to be sure that all the push rods are spinning and that oil is running down each push rod.
If any of the push rods are not spinning or if oil is not present at the rocker arms, stop and correct immediately... prior to doing any "run-in", re-torquing, valve adjusting or tuning.
DD

I thought I'd post the break-in used by engine guru David Vizard. http://www.stockcarracing.com/techartic ... index.html

_________________
Joshua