Dave A
USER UNDER INVESTIGATION - DO NOT TRADE
Registered: 10th Dec 03
Location: County Durham
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move to tutorials?
http://mototuneusa.com/break_in_secrets.htm
been speaking this week to a lot of tuning and motorsport companies about running in engines, the whols subject is surrounded by confusion and lots of different methods are used. However all companies I have spoken to agree with the above method.
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Robin
Premium Member
Registered: 7th Jan 04
Location: Northants Drives: Clio 182 Cup
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None of this poncing about for 1000 miles then?
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All Torque
Member
Registered: 17th Nov 05
Location: Milton Keynes Drives: Ford Focus TDCi
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Interested read 
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GHurn
Member
Registered: 15th Jan 05
Location: magor, south wales
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i was told this method by the guy building the engine for my ka!
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willhouse
Member
Registered: 11th Jul 06
Location: Sheffield
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a mate or mine ran a freshly rebuilt engine that we did (new pistons, rings etc and full head rebuild- no modifications to standard) quite steadly for 100 miles, then gave it death for the rest and it has been absolutely fine and performs a hell of alot better than before.
agree completely with what the link says
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Daniel_Corsa
Premium Member
Registered: 21st Apr 04
Location: Wigton, Cumbria
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Alot of people I know believe in thrash them from start, none of the fannying on for 1000 miles etc.
April '06' Corsasport Feature Car  | Aug '08' Total Vauxhall Feature Car | Spring '09' Fast Car Feature Car
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davey_jack
Member
Registered: 28th Jan 06
Location: Horley, Surrey Drives: Clio 182
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I let my newly built x14xe warm up, gave it a 20 minute thrash, then changed the oil, then drove it for about 100 miles, changed oil again, then drove for 500 and changed it again, then did the same after 1000 miles. I used 10W40 fully synthetic though, and its been fine,plenty of compression, no smoking, runs very smoothly too.
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Greg_M
Member
Registered: 2nd Sep 03
Location: Grantham, Lincolnshire
User status: Offline
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thrash i from the start by all means.
i will produce marginaly more power, but dont expect it to last as long
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Vaux Lad
Member
Registered: 15th Dec 04
Location: Stoke-on-Trent
User status: Offline
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quote:
Originally posted by Robin
None of this poncing about for 1000 miles then?
That can be bad for a newly rebuilt engine.
You want plenty of overrun(vacuum level is at its max on overrun), which forces the rings to bed into the bores much better. As covered in that link.
Just dont put too much load on the engine.
The whole dont go over 2K for a 1000miles is a bit of a myth tbh.
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Vaux Lad
Member
Registered: 15th Dec 04
Location: Stoke-on-Trent
User status: Offline
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quote:
Originally posted by Greg_M
thrash i from the start by all means.
i will produce marginaly more power, but dont expect it to last as long
Its how a mates 1600 8v was ran in, it still has great compression and doesn't burn oil 50'000miles later 
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Olsrey
Member
Registered: 13th Jan 07
Location: Bradford Drives: LET Vectra B
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So Dave, is this the advice you will be giving people you rebuild engines for?
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P1CK4D
Member
Registered: 19th Jun 06
Location: Around Essex Somewhere
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Did I really read that right?? Abuse practically straight away? Why not do the 1000 mile thing
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stubs
Member
Registered: 30th Jun 02
Location: Bolton
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Re-post
http://www.corsasport.co.uk/board/viewthread.php?tid=141886
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bieransri
Member
Registered: 13th Apr 06
Location: Kidsgrove, Staffordshire
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will you be doing this dave?
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Kurt
Member
Registered: 23rd Oct 05
Location: Hi
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so if its all in the first 20 miles then your screwed really as pdi techs, valeters, salesmen all get your new car before that
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Dan_1.6_8v
Member
Registered: 7th May 07
Location: Gloucestershire
User status: Offline
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back in 2000 when i ran my engine in i just followed the instructions given to me in the literature by the company that built the bottom end. That was the 1000 mile effort, i didnt do it to the letter and gave it abit more than suggested but still within the realms of what they wrote. The engine still goes well now with well over 50k on it as seen in the trackday vids i put up the other week and is tbh abit of a freak when it comes to engines and reliability
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GHurn
Member
Registered: 15th Jan 05
Location: magor, south wales
User status: Offline
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there is no need for 1000 mile run in, it was needed years ago when the tolerences and quality of the matrials used in bearings rings, honing etc wernt great, today though its a completly different story the materials and tolerences are that good that there is no need to break the engine in for 1000miles! a few hundred if that!
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Rick Draper
Member
Registered: 10th Feb 01
Location: Cheshire
User status: Offline
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All you need to do is change the oil often during the running in and you will be fine trashing it.
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wilson_sri
Member
Registered: 31st Aug 04
Location: Dunfermline Drives: Technics 1210s
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good read that, cheers for the info dave.
When i put my rebuilt LET in my old corsa, i ran it in for 1500 miles, changed the oil then ran it for another 500 miles. Always thought thats what you had to do with a turbo engine.
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broster
Premium Member
Registered: 6th Dec 02
Location: Drives: E39
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every engine we build, and we build alot of engines, we recommend that they are run for 1000 miles before given hard abuse.
there are a few methods all of which work, but i will be driving my car gently on its run in, same as last time.
if it was a standard engine then more than likely id give it death from the start but anything thats a bit different id take easy to make sure its all good
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wilson_sri
Member
Registered: 31st Aug 04
Location: Dunfermline Drives: Technics 1210s
User status: Offline
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Would you do the same with a let engine broster?
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Robin
Premium Member
Registered: 7th Jan 04
Location: Northants Drives: Clio 182 Cup
User status: Offline
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quote:
Originally posted by broster
there are a few methods all of which work, but i will be driving my car gently on its run in, same as last time.
Can I run it in? 
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Scotty C
Member
Registered: 6th Nov 05
Location: Kidderminster Drives: 1.6 16v Sport
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So, you've just put new pistons & rings in, new head gasket etc and start it up, let it warm and give it complete death straight away? then change the oil 20 miles later? then the engine is back to normal?
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GHurn
Member
Registered: 15th Jan 05
Location: magor, south wales
User status: Offline
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whats its saying is that there is only a small window in whihc to get the rings etc to seal properly, this is due to the tight tolerences that are used today, un like years ago the bores were honed that rough and bearings wernt to the same quality as they are today that a long running in period was needed to get everything to bed in correctly!
these days its not really needed!
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wilson_sri
Member
Registered: 31st Aug 04
Location: Dunfermline Drives: Technics 1210s
User status: Offline
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so on older engines like c20xe/c20lets you should still run the engine in properly?
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