Top end re-build

iangray100 · Jun 5, 2008

Darren , There are many trains of thought on this but the engine builders in the US I read and actual spoke to (one top builder) the phone ( i'm UK based through but brought some parts from him ) said ...to run the 964 engine is it needs to be run in quickly, after the rebuild run quite hard through the rev range ....due to the way the [link=http://www.google.co.uk/search?hl=en&rls=GGLJ,GGLJ:2006-47,GGLJ:en-GB&sa=X&oi=spell&resnum=0&ct=result&cd=1&q=nikasil+bores&spell=1]nikasil bores[/link] work, and the way the rings have to be bed in or they will tarnish up and then smoke over time or break...don't potter around in 4th gear at 2K revs for 3K miles ;-)....use the gears and the rev range but not like a boy racer ......fast but gentle ;-) Its not quite like a "normal run in" is all I can say I'm pretty sure I have something on my link below or just search the Pelican boy for a run "in thread"

snake1 · Jun 5, 2008

Hi all

I have taken the plunge and spent way too much money having the top end of my car's engine re-bulit. The reputable specialist that maintains the car has undertaken the work.

As much as I tried to live with it, that persistent oil patch on the garage floor was slowly driving me mad.

My question relates to running in as I have both read and heard different schools of thought as to what to do for the best.

I would be grateful for any (further) advice offered.

Thanks

Darren.

Alexander_Drobik · Jun 5, 2008

I looked at this when I had my engine done. I was told: 1. first 250 miles - be very gentle - don't go over 5000 revs, and don't race the engine. Let the engine get warm. 2. to 500 miles - keep to under 5,000 revs but start t rev the engine a little more like normal. 3. to 2500 miles - still don't crank it up as fast as you can - gentle acceleration etc. But - use the full rev range every so often - I would not go above 6500 until the first service. Don't sit on the motorway at 70 in top. If you have a long trip better to make sure you go between say 2500 and 4000 by changing speed or gears. Best is cross-country runs. You are trying to avoid a groove at one rev position. The running in polishes new bearings, rings and the like and it needs to run at different loads, revs etc. 4. At 2500 you will have the first service - tappets done, new oil etc. Only after that can you use the engine fully - although it will be 'stiff' for probably another 5000 miles.