Ry_B
Banned
Registered: 1st Dec 05
Location: Solihull, W Mids Drives: 45BHP beast!
User status: Offline
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http://www.mototuneusa.com/break_in_secrets.htm
I know it's an old site but never really knew what to believe.
I know after you've rebuilt an engine you run it in, but say on a new car if you rag it from day one is this guy telling the truth? 
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Robin
Premium Member
Registered: 7th Jan 04
Location: Northants Drives: Clio 182 Cup
User status: Offline
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he speaketh the truth
if you run a car in HARD, it will make more power, but the engine wont last as long
a lot of motorbikes are caned from the start, cos they dont cover many miles, and the extra power outweighs the rebuild frequency
when i run my new engine in, i will be abusing it, from the start
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mazdaspeed
Member
Registered: 8th Jan 05
Location: Darlington
User status: Offline
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Well my new piston rings say that you drive from 35 to 55mph but don't stay at same RPM for 20 minutes and drive normally after that!
But yes, when my engine is back together I will give it full throttle at low revs for 20 miles or so, then change the oil.
[Edited on 30-05-2006 by mazdaspeed]
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Dave A
USER UNDER INVESTIGATION - DO NOT TRADE
Registered: 10th Dec 03
Location: County Durham
User status: Offline
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quote:
Originally posted by mazdaspeed
Well my new piston rings say that you drive from 35 to 55mph but don't stay at same RPM for 20 minutes and drive normally after that!
But yes, when my engine is back together I will give it full throttle at low revs for 20 miles or so, then change the oil.
[Edited on 30-05-2006 by mazdaspeed]
if u are fitting new con rod bearings at the same time as the rings then try not to labour the engine during the running in. i.e dont drive at low revs with your foot on the floor, just give it as much throttle as it needs.
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Jamie Walby
Member
Registered: 15th Nov 04
User status: Offline
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I know with the engines for the radio controlled planes if you dont rag them from day one the seize up.
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broster
Premium Member
Registered: 6th Dec 02
Location: Drives: E39
User status: Offline
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ir an mine in over 1000miles, gently at first then gave it more and more abuse as time went on never gave it loads of stick tho
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mwg
Member
Registered: 19th Feb 04
Location: South Lakes
User status: Offline
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I would do as Broster. Run in gently and increase revs gradually as the miles clock up.
Rather have a little less power and increased engine life in a road car
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broster
Premium Member
Registered: 6th Dec 02
Location: Drives: E39
User status: Offline
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my engine has limited life anyway, due to the nature of the engine.... and high revs, but i was advised by the engine builder this was the best way to go...
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