GHurn
Member
Registered: 15th Jan 05
Location: magor, south wales
User status: Offline
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no i mean older engines, 50.60.70's
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Dave A
USER UNDER INVESTIGATION - DO NOT TRADE
Registered: 10th Dec 03
Location: County Durham
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Most motorsport companies use the hard and fast run in method, MT motorsport (a company I work with) uses the method in the link on their race engines, standard engines, engines in their new cars, engines they have rebuilt for themselfes for road use, their customers engines.... never use anything else.
personally I use a 50/50 method, run engines in hard initially to bed the rings in and Knock the peaks off the hone marks on the bores, change the oil and then drive normally but not too hard for another 500 miles, gradually building up load and rpm's. its the first 30 mins of running that is all important.
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Scotty C
Member
Registered: 6th Nov 05
Location: Kidderminster Drives: 1.6 16v Sport
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Did mine completly wrong then 
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caseboy
Member
Registered: 3rd Dec 08
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i belive in this its ture in my job i am an agricltural mechanic an if cutomers treat ther new tractor easy for the firs 250 hours thin its gutless ,but if theythrash it its a lot more powerfull 10-15% this is on diesel engines but the theory is the same
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BarnshaW
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Registered: 25th Oct 06
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thread digger lol
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Tom G
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Registered: 4th Aug 08
Location: Cheshire
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How did he find this thread, been trawing throught the pages?? or the releated thread thing??
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BarnshaW
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Registered: 25th Oct 06
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must have been the related thread thing i bet
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Tom G
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Registered: 4th Aug 08
Location: Cheshire
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i was going to say this must b like 100 pages back
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crazybrightman
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Registered: 30th Mar 09
Location: leicestershire
User status: Offline
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hmm a good old opinion thread.
well from my perspective if you have rebuilt an engine (ie not brand new) then theres only one part to run in the piston rings. all other components withing the engine shoudl be running on a film of oil so dont require running in!
the only expectption to this is if you have fitted new pistons or cams aswell but unlikely. therefore you want to bed the rings in as fast as possible do this by using lots of vacum and pressure, (engine braking and full throttle) but this wants to be at relatively mild revs. massive revs = increased piston speed and therefore too much friction and heat going into the rings.
all this should be on a running in or mineral oil for 100+ miles, normaly a good 500 but the first 100 are very important.
then change to synthetic and off you go.
a engine will take a few thousand miles to fully loosen up though from new, and with modern engineering tolernaces and improved material quality bedding in is not as essential as it used to be.
how ever thats all imho and everyone has a different theory on it. the safest bet is always to tell people to drive carefully.
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Kurt
Member
Registered: 23rd Oct 05
Location: Hi
User status: Offline
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Im pretty sure it would be run in by now
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sand-eel
Member
Registered: 15th Mar 07
Location: carluke/braidwood--IRNBRULAND
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Well your fucked anyway if you buy a new car as it will have 20odd miles of driving out the factory and off and on car transporters which isn't full throttle in my book.
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Kurt
Member
Registered: 23rd Oct 05
Location: Hi
User status: Offline
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I said that 2 years ago 
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