skatepony

some one told me that u need to break bgi mods like heads and cams in like nto go over 50 for a weekand things liek that can someone enlighten me

mdvaldosta

slow down, try again</P>

Mach1

I thinks hes asking if you have to break those mods in. What do you mean by 50? 50 mph? How fast your going doesnt translate into engine speed. Just keep the rpms down a little for a few hundred miles.

harvey041

This is straight out of my Auto Diagnosis, Service, and Repair book. This applys to whole new engines and major new parts on the engine:</P>


Proper Break-In</P>


Modern design, materials, machines, and repair procedures make it possible to assemble an engine with highly accurate clearances and controlled finishes. This has eliminated the long, old fashioned break-in period. Despite the fact that break-in is simplified, proper break-in is still of major importance. The first hour or so of engine operation is extremly crictical. Lubrication, rmp, tempurature, and loading are all vital. If these are correct, they will produce proper wearing in of the rings, cylinder walls, and bearings until mating parts are smooth enough to provide proper sealing and to reduce friction to a normal level.</P>


Run the Engine at Fast Idle</P>


When the engine is first started, the choke (on older vehicles) or the electronic control system (on newer vehicles) will cause the idle speed to be higher than normal. This is desirable to ensure an oil pressure and throw-off sufficient to adequatley lubricate the cylinder walls. Run the engine at this speed until normal operating tempurature is reached (usaully 15 to 20 minutes). If the cold idle is not aproximatley 1200 rpm, raise the speed by some means to warm the engine.</P>


Do a Road Test/Break-In Run</P>


Drive the vehical to a spot where you can <U><FONT size=2>safely</FONT></U>reach a speed of 50 mph (80km/h). Accelerate rapidly up to about 50 mph (80 km/h). Immediatley let up on the accelerator and allow the car to coast down to around 30mph (48 km/h). Drive the vehicle at 30 mph (48 km/h) for a block or so and again rapidly accelerate up to 50 mph (80 km/h). Once again coast back to 30 mph (48 km/h). Accelerate and coast fifteen to twenty times. When slowing down wacth for cars behind you. The object of the acceleration is to increase ring loading against the cylinder walls, speeding up the break-in. During the coast period, strong vacuum in the cylinders will draw additional oil up around the rings.</P>


</P>


Thats the majority of it, if anyone wants to read the whole chapter on it e-mail me. Hope that helped out.</P><edited><editID>harvey041</editID><editDate>37915.0186574074</editDate></edited>