How long for break in? - Chevelle Tech
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post #1 of 14 (permalink) Old Jun 6th, 20, 9:33 AM Thread Starter
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How long for break in?

Been reading a lot of different opinions on break in time and would like to get some opinions. A lot of people say 20 minutes at 2000 rpm and some people say 2 ten minute cycles. Going to be firing my motor off in another 2 hours from now so I would like to break it in correctly. Motor is a 454, 30 over with a hydraulic roller cam. I am using the comp cams break in oil also. Any suggestions?
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post #2 of 14 (permalink) Old Jun 6th, 20, 9:52 AM
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Re: How long for break in?

Most the time the main reason to have a good break in, is to break in the cam right. If I read your post correct, you have a roller cam. It is the flat tappet cams then, it is so important to break in correct. I would just do a short break in, and then change oil and filter, and be good to go,
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post #3 of 14 (permalink) Old Jun 6th, 20, 11:49 AM
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Re: How long for break in?

Roller cam doesn't need the 20 minute/2000 rpm flat tappet cam break-in cycle.

Just fire it up, rpm around 1400-1800 or more if you like to get good oil and water movement and run until it is good and hot. Shut it off, let it cool, check bolt tightness on things and you're good. Proceed to timing and carb tuning.
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post #4 of 14 (permalink) Old Jun 6th, 20, 1:12 PM
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Re: How long for break in?

Then go & hammer it to make sure the rings are seated.
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post #5 of 14 (permalink) Old Jun 6th, 20, 5:41 PM
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Re: How long for break in?

Mark,
Like the others said a hydraulic roller cam does not need that type of break in. What is more important is to get the timing set, make sure the fluids are good and then go drive it to get the rings broken in. The rings need a load to properly break in and the longer you just run it without driving it the worse it could be.
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post #6 of 14 (permalink) Old Jun 6th, 20, 6:53 PM
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Re: How long for break in?

x2 load those rings up..get it in a higher gear if possible run it up rpm (not too high but dont baby it) then let decel back down, rinse repeat a good dozen times or so.

Drive it as you normally would for about 50 mi, dont lug it.

Dump your oil, check the filter for bad stuff, then go run her hard.
Lugging isnt good for any engine....on another forum some brag how low they lug their stuff convinced they are "saving" it. Nope
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post #7 of 14 (permalink) Old Jun 6th, 20, 8:34 PM
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Re: How long for break in?

Dont mean to derail but curious what does the term 'lugging' mean ?

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post #8 of 14 (permalink) Old Jun 6th, 20, 9:15 PM
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Re: How long for break in?

Quote:
Originally Posted by pduncan View Post
Dont mean to derail but curious what does the term 'lugging' mean ?
Pulling the engine down in RPM under load. Almost to but not quite to the point of stall--> just headed in that direction.

One of many articles:

https://www.roadandtrack.com/car-cul...ad-for-engine/

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post #9 of 14 (permalink) Old Jun 6th, 20, 9:15 PM
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Re: How long for break in?

Low RPM chug-a-lugin, Levon I think we were typing at the same time
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post #10 of 14 (permalink) Old Jun 7th, 20, 9:47 AM
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Re: How long for break in?

New engine break-in procedure for a flat tappet engine. There are those who will probably not agree as this is all old school but it has never failed for me and my customers . For the cam proper oil new wix filter make sure dizzy in right so it will fire right up, cooling system as full as can be 1/8th hole in thermostat for air pockets . Assuming everything ready start engine bring to 200 rpm for ten minutes then start changing between 2 and 3000 rpm varying the rpm but never below2000 for another ten minutes then back to 2000 for five more 25 minutes total. If the cam lifters and all the other stuff was right you should be good. shut engine drain oil and filter refill. now for the ring break-in . Assuming good rings proper honing procedure for the ring type. take the car out on the highway bring it up to 60 / 70 mph let off the throttle coast back down to 25 / 30 mph floor it back up to 60 / 70 mph and let off again . if you do this7 or 8 times you should be good to go with the piston ring technology they have today. Go about 500 miles and drive as you normally do don't baby it, then change the oil and filter again. Now you are all set for 1000 miles at this point do another oil change and filter from that point follow your normal change time 2500 /3000 miles . Some will disagree saying its a waste of oil very old school and not needed but I disagree. If the parts machine work and proper roil were all up to snuff you will have a happy motor for many years and miles to come and will serve you well. thank you .Alex
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post #11 of 14 (permalink) Old Jun 7th, 20, 10:58 AM Thread Starter
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Re: How long for break in?

Well the fire up went well... finally got ahold of the engine builder and he said.. “ No synthetic oil until after break in . What you have to do is start the engine and keep it at a raised idle 1600rpm for 20min. Don't worry about tune up until after 20 min break in. After the break in set timing and carb adjustments. Do not idle after that. The car must be driven for about 400 miles varying speed but no full power. At that point it will be fine to beat on .Change oil at 600miles. If it idles it for too long, the cylinder pressures are too low for break in and the hone on the walls will glaze over resulting in excessive oil consumption”. With that being said, I started her up and kept he between 1500 - 1800 rpms for 20 minutes with a couple of quick revs in between. Temperature varied between 180 - 210, was using the infrared gun and shot the intake manifold, block and front of the cylinder head. Timing was roughly 16-18 degrees without the vacuum advanced hooked up, was outside so was a little to bright to get an accurate reading with the timing light. All in all went well with only some leakage coming from the carburetor dual feed. Now to finish everything else and get her registered and insured, that's is the dmv opens anything soon. Thanks for all your input.
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post #12 of 14 (permalink) Old Jun 7th, 20, 12:16 PM
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Re: How long for break in?

Wow. Beautiful ride ya got there. Love the blue.

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post #13 of 14 (permalink) Old Jun 7th, 20, 12:41 PM
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Re: How long for break in?

You'll probably still see some smoke or oil consumption for the first 500 miles until the rings fully seat especially if you use chrome rings.


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post #14 of 14 (permalink) Old Jun 7th, 20, 8:57 PM
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