Hi, what would be the best way to start up a new rebuild engine, how would you run it in, and what oil would you use...???

 

Allways use a cheap mineral oil to run it in, never use a good quality sinthetic oil.

When i stated mine i just turned the engine over for about 10 seconds with the plugs out, just to get some oil pressure. Then poped the plugs back in and started her up, held about 2500rpm for 20 mins and your done.

 

if you are running in a new engine that has been rebuilt then the oil want to be the cheapest that money can buy and use graphite grease on all moving parts as when you first start up there is no oil on any of these moving parts ? as for running in dont do as the other guy says as you will just destroy the effort and money spent on having the rebuild you want to run it in on the move when the car is being driven not on the spot for twenty mins you need to do 800 miles at 2500/
3000 revs and no more then drop the oil and filter replace and then use the cheapest oil again and do a further 600 miles at 3000 revs to 4000 revs and no more but the more miles you do the more reliable it will be in the long run the longer it will last you after you have done this use the specified oil listed happy motoring

 

There is no set run in procedure,as zvhturbo says running @2500 for 20 mins at first start is basically to run the cams in alone. Running the engine in can be done on the go as tomsxr3i said. Varied load is advisable so no constant motorway miles. Plenty of oil changes and if you can empty a small ammount into a clean contianer to check for excessive debree. Personally after first run,if there no leaks i like to run my engines in fairly hard,uphill full throttle or high gear from low rpm to high rpm every couple of mile on the motorway. Long periods of idle arent too clever,and change down before the engine labours. Basically if its built right it should be ok. Put some juice in and get cracking

 

any more opinions/methods?

 

FWIW my Cossie engine has never seen mineral oil and was run in progressively harder once the first 50ish miles had passed.

Up to about 4-4.5k for about 600 miles then 6k until 1200. Rev limiter changes after that. All on 1 Bar boost.

 

you are correct in saying to use a mineral oil for initial running in, can help prevent glazing of the bores when using new rings e.t.c
i always initially start up an engine with no coolant for about 30 seconds to get some heat in the head gasket.
crank engine with no spark plugs in till oil light goes out.
when an engine is assemled you should use an assembly lube of all connecting surfaces, bearings, and use plenty of cam lube on camshafts and followers e.t.c

the running in time is greatly over exagerated by many people, a crank is machined to tolerances that dont require running in, camshafts just require about 20/30 at about 2500, NEVER let an engine idle on new camshafts cause the oil pressure is lower at idle.

once run for 30 seconds fill system with appropriate amount of anti-freeze and water, check oil level and tension of all running belts, especially cam belt.

then i do 50miles or an hour driving use 50% revs, 3500rpm ish. then a trip to rolling road to get mixture/timing checked e.t.c and then providing all is well you can then use the engine to its full potential.