In reply to a message from BruceHarless sent Thu 27 Jan 2011:
So how long is ‘‘too much’’ for that initial slow-speed
running? How much literal time can/should I run the new
engine with no load, just sitting in the driveway?
Bruce,
My opinion is less is better. My advice would be to wait until the
tank is in place, then start it, test for leaks, set the timing and
idle, and then drive it. There really is no point in running it at
idle, especially if it is going to sit for any length of time.
If you read the window sticker than came from the factory,
the ‘‘break in’’ period was several thousand miles. ‘‘Do not exceed
2500 rpm for 1000 miles, 3000 rpm for 2500 miles and only use
minimum throttle openning’’. My opinion is that this was warranty
and liability driven and is not the best strategy. My preference
is to fill up with a good non sythetic oil, prime the oil system
with pressure or cranking without plugs, fire up the engine, make
the basic setting and get it under load with a minimum of idling.
Many sources say no idling for the first 20 minutes for cam break
in, you probably don’t have a new cam or pushrods, but that is not
bad advice for other reasons. What is a ‘‘good oil’’ today is a real
debate. Once the engine is warm, do not drive it around under
minimum throttle openning, vary the throttle opening under load to
help seat the rings. Keep the rpm between 1500 and 3000 and avoid
higher rpm for at least a few hundred miles. Change the oil and
filter at 500 miles.
The way to build confidence in a new rebuild is to take
progressively longer trips. Start with a few miles in circles and
work up to 10, 20 and 50 mile trips. The important thing is to get
it hot and drive it under load so you can make the little
adjustments that will make it a delight to drive. Good luck.
Paul–
The original message included these comments:
Roger et al, I am starting with a completely new engine –
new liners, pistons, rings, etc. The car has fired up one
time, just long enough to pump 4 qts of oil onto my
driveway. I think it is ready to actually RUN now. So,
assuming that happens, and properly, I will be able to
connect and (partially) fill the newly-lined tank with
little fanfare.
So how long is ‘‘too much’’ for that initial slow-speed
running? How much literal time can/should I run the new
engine with no load, just sitting in the driveway? What is
the magic solution to the question of how to drive the car
–
PS
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