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3rd May 2019, 06:51 | #1 |
This is my second home
Rover 75 Saloon & Tourer Join Date: Sep 2012
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running in an engine, is it a myth?
when I was a teenager someone once said to me about running in an engine, run in fast, always fast. Is this a myth?
I was also told run an engine in gently.... handbooks used to say similar Race engines, I think they get thrashed from day 1 which fits with run in fast, always fast but they have a short life macafee2 |
3rd May 2019, 06:57 | #2 | |
Gets stuck in
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Please Pass - Running In. I had a couple of those signs in the back window back when. So always slowly ( or as slow as a hormonal teenager with a pretty girl in the passenger seat and a 2.0s Capri could drive ) Ahhhh...happy days. |
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3rd May 2019, 07:43 | #3 |
Precise
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It used to be, not to exceed 2000 rpm, always gentle acceleration and first oil + filter change at 500 miles.
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3rd May 2019, 08:41 | #4 |
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I remember the signs "Running in please pass" and the ones "Running out please push"!
My old dad used to shout "No mechanical sympathy" when anything was being thrashed.
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3rd May 2019, 09:12 | #5 |
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Too many variables for a quick reply.
Maker--materials used--factory tolerances--etc, etc the list goes on and on. Generally though take it easy for the first 1,000 miles or so if you want long life. Those racing engines last only a few months.--- |
3rd May 2019, 10:16 | #6 |
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but what about run in fast always fast, is it true or rubbish?
macafee2 |
3rd May 2019, 10:22 | #7 | |
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Agreed. Also, change the engine oil after the first 1000 miles in order to remove the suspended particles resulting from the running in process. |
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5th May 2019, 09:22 | #8 | |
I really should get out more.......
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race engines are for winning races, they are stripped down at the end of each race and each component is examined under the microscope!. Last edited by grivas; 5th May 2019 at 09:24.. Reason: additional info |
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5th May 2019, 20:38 | #9 |
Posted a thing or two
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Really? Only the money no issue, no engine rules formula. Most people racing couldn't afford rebuilds after each meeting, let alone each race.
Running in for one of my race engines would be as many warm up cycles as you could get in, wide ranging rpms, no idling (does more damage than anything), check everything possible - leaks, tightness etc, drop the oil and filter, replace then away. Rebuild when it had an issue. Now, if this were a BDG or similar for a customer, the builder would life it, in hours, a bit like you describe above. But that would be because the potential cost of a failure would be many times the cost of a rebuild. I guess what I'm saying is the rules are there are no rules... |
6th May 2019, 09:59 | #10 | |
I really should get out more.......
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