I wanted to share what I found wrote by Massive
Hey All
Engine run in theory ala Massive
Please do not believe anything i say. please consult any good racing engine builder to confirm what im saying here. if they dont confirm what i say please find a better engine builder to consult.
Lets pretend we are all fantastic at tuning and have absolutely no faults occour outside the engine. If you run a new engine hard from day one and it pops in the first litre of fuel, there is a good chance that engine would have popped sooner or later because it has a material fault. Ask any engine builder that builds race engines full scale. Once its built they start it , warm it up, then cane the crap out of it, if it dosent pop then its right to race, if it pops they rebuild it. Why do they do that ? so it dosent fail them during a race .
Interesting thing i read in a manual for a 1984 BMW 328 is . and i quote
"Cold start engine please start and drive immediately !! do not idle engine for warm up "
Why do they state that ? because in Germany or Bavaria in winter they know that metals contract in the cold , in order for the engine to last it has to heat up , the quickest way to heat up an engine is to drive it or put load onto it. If you idle a cold engine you are prolonging the time it is exposed to being cold and contracted. Once its hot and expanded all the engine internals can work easily without stress because they have expanded.
Internal Combustion engines LIKE HEAT they thrive on it
In the case of ABC non ringed engines the engine relies heavily on heat to expand the case and sleeve. People normally equate heat with running lean. Thats what we have to get our heads around, that heat does not nessesarily mean an engine is lean. An engine is lean when it starves for fuel. Thats lean Bogging, thats bad for an engine.
If you run an engine say for the first litre of fuel at 100 deg c the case and sleeve will expand for that temp. after 1 litre of fuel the engine will have done on average about 960,000 revolutions. how i calculated that is
average 8 mins per tank @ an avearge of 15,000 rpm
125 ml tank
1 tank = 8 x 15,000 = 120,000 revolutions x 8 tanks = 960,000
By the time you have done almost 1 million revolutions the piston and sleeve would have bed in to the fit, goverend by the heat expansion @ 100 deg c. What happens when you start to race the engine ? you start to get to 110 c 120 c 140 c 160 c ... What happens to the piston seal at TDC when the case and sleeve expand further than what the engine is used to ?
the answer is, an engine that runs like a piece of doggy doo doo .. Not to mention that a newly squared piston top smashing into an un expanded sleeve.
Can you imagine bouncing on a trampoline at 15,000 jumps per minute with a concrete celing 1 foot above your head ? After close to 1 million jumps your head would be flattened , your knees and spine would be shot , then you are expected to run a marathon at the olympics... Its not gonna happen.
This is what kills rods and rear bearings. its like a jack hammer pounding these parts. then when you run them hard they pop because the damage was done during the run in period.
So !
When you run in an engine run it how you would in racing from day 1
Thats dosent mean run it lean, who on earth runs a race engine lean !? run it at a correct tune so that the engine is happy and consistant. get the engine used to what you want from it from day 1 then the poor thing wont get confused later in its life and throw all the toys out of the cot.
MASSSIVE