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frankOne 03-28-2013 12:52 PM

Engine Breakin Question
 
I am getting ready to breakin a pontiac 400 engine in a 71 firebird with an auto trans. I was told that to minimize the load on the engine I should not connect the torque converter to the flexplate for the first start up and 20+ minute breakin process. Is this reasonable and is it a safety issue with the flexplate turning 2500 rpm so close to the stationary torque converter. Thanks for any comments.

gearheadslife 03-28-2013 01:38 PM

break in, would be better under some load..
last one I did, the car was on stands(rear) and it in gear with ebrake on.. to limit wheel movement but still spin.. with someone in car in case it happened to fall off stands, (better safe than sorry)
I like having three people.. one in car, one looking for leaks and keeping it from over heating, as I keep the rpms at 1500-2000 and adjust the timing/etc while it's running if need(glowing headers)

NastyRat 03-28-2013 04:46 PM

Break in
 
Do the break-in at 5 minute intervals and let cool as not to over heat the oil. Also this heat cycles the GSKTS and is a good time to re-torque things. Main concern is the cam after that break in the rest of the Engine will seat in, in the first 350 miles then change oil and good to pound on after that. Slider cams must have high ZINC additives added during beak-in and all other oil changes.

cobalt327 03-28-2013 07:33 PM

Quote:

Originally Posted by frankOne (Post 1661159)
I am getting ready to breakin a pontiac 400 engine in a 71 firebird with an auto trans. I was told that to minimize the load on the engine I should not connect the torque converter to the flexplate for the first start up and 20+ minute breakin process. Is this reasonable and is it a safety issue with the flexplate turning 2500 rpm so close to the stationary torque converter. Thanks for any comments.

Connecting the TC will not be an issue. Bolt it up and proceed w/the break in.

Info on cam break in
First start up

Cam break in requires no load on engine. That's later on when you're breaking in the rings, etc. the rest of the way.

DO NOT break in the cam w/the wheels turning while up on stands. Put the trans in Park, choke the wheels. A large fan in front of the radiator can help, be sure the timing isn't too retarded.

KyleG 03-28-2013 09:10 PM

My dad has built more motors than most has seen. He starts it up, lets it run for aproximently 30 minutes. During this 30 minutes, he adjust the rockers, checks for leaks, and sits around. Then, after that he drives it how he plans on driving it for the rest of its life. Has not failed him, yet.

cobalt327 03-28-2013 11:50 PM

As long as the engine never idles during the cam break in period- unless it's a roller cam- that's fine.

painted jester 03-29-2013 12:29 AM

Listen to cobalt!!!!!!! :thumbup:

"Connecting the TC will not be an issue.Bolt it up and proceed w/the break in":thumbup:


"DO NOT break in the cam w/the wheels turning while up on stands." NEVER :nono: !!!!!

Jester

painted jester 03-29-2013 01:23 AM

In case you installed new springs? (Roller or flat tappet cam valve springs need to be heat set)


Flat tappet cams should be broke in for at least 20 minutes between 2,000 and 2,500 rpm and with no-load, I usually run mine for 45 minutes!

And after that if I installed new springs I run a spring break in procedure called a "Heat set" Upon start-up, limit rpm to 2000 until the temperature has reached operating levels (30 minutes of cam break in if springs and cam are being done at the same time). Shut off the engine after cam break in and allow the springs to cool to room temperature, Then run again about 20 min. and cool again to room temp. Do this a several times!!! This will help eliminate premature failure and prolong valve spring life. Some springs are already heat set at the manufacturer check the tech sheet or call the spring manufacturer to be sure! Like The new Lunati LS Dual Valve Spring Kits the springs are already heat set!

Jester


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