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Old 10-11-2019, 02:52 PM   #1
stupidringlands
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Default Any tips on new motor break in?

Just had a shortblock replaced and the engine overhauled, valve lifters etc done. I was wondering what I should do for break in, and should I put the cobb tune on it during break in?
Thanks in advance!
It's a 2010 WRX
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Old 10-11-2019, 03:03 PM   #2
WRXnick16
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You'll get all kind of opinions on this subject.

DSPORT has a great article on the topic:
https://dsportmag.com/the-tech/educa...the-right-way/
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Old 10-11-2019, 03:07 PM   #3
WRXnick16
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You should also adhere to the suggestions/guidelines of your engine builder. They may have a specific break-in process to follow in order to maintain a "warranty" on their work.
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Old 10-12-2019, 04:26 AM   #4
stu
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CHANGE OIL, CHANGE OIL, CHANGE OIL, REPEAT. and lots of decel
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Old 10-12-2019, 09:21 AM   #5
Jay11STI
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Ultimatly you should be asking the person who built the engine and your tuner on recommendations for this. I personally would break in the engine the same way the factory recommends. Lots of down shifts, and variable speeds. Dont stay cruising at the same rpm and speed (i.e. highway driving). Try and perform as many drive cycles as possible. I wouldnt go past 4K rpms until 500 miles and then continue to go up higher in revs up untill you get to 1000 miles on the engine. Then change the oil and let er rip.
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Old 10-12-2019, 11:37 AM   #6
subaru_gc8
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I was told my by builder to do basically rev tyhe engine up to 3000 and decel to 2000 for 1000 miles. it was pretty annoying, but my engine seems to be doing well. but I do second listineing to your builder and doing what they say
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Old 10-15-2019, 01:54 PM   #7
car_freak85
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I went the "hard" break-in route with my EJ205. I stayed out of boost (don't remember how long) but lots of acceleration up to about 4k rpm, and a whole lot of zero-throttle deceleration in-gear.

I burn zero oil, even on extended OCIs.
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Old 10-15-2019, 03:08 PM   #8
rtv900
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Quote:
Originally Posted by car_freak85 View Post
I went the "hard" break-in route with my EJ205. I stayed out of boost (don't remember how long) but lots of acceleration up to about 4k rpm, and a whole lot of zero-throttle deceleration in-gear.

I burn zero oil, even on extended OCIs.
^this sounds like you did a proper break in, not at all the hard/non break in.

The hard break in asylum escapees recommend WOT immediately after warm up straight to red line over and over. Basically, no break in at all and blind faith that no internal finishing needs done to run in parts. Zero logic and reason.

If you held off on blowing past 4,000 rpm's then it sounds like you chose to actually run the motor in correctly.
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