rodgling
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| posted on 16/6/12 at 09:47 PM |
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Running in new big-end bearings
Do big-end bearings need running in? I've just replaced mine, should I nurse the car for a few hundred miles or just get on with it? I
don't see why they would need it, after all they shouldn't be in contact with the crank, but better safe than sorry?
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Chippy
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| posted on 16/6/12 at 10:20 PM |
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As long as they are getting oil they are the best they will ever be, so, no just run them as usual. IMHO Ray
To make a car go faster, just add lightness. Colin Chapman - OR - fit a bigger engine. Chippy
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mookaloid
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| posted on 16/6/12 at 10:24 PM |
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big ends don't actually make contact with the shells due to the oil layer so running in shouldn't be necessary. just make sure there is
oil pressure before starting up.
"That thing you're thinking - it wont be that."
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rodgling
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| posted on 17/6/12 at 04:18 PM |
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Oil pressure is good, solid 40 psi at 2k rpm and 10 at hot idle (normal numbers for this engine I think). Cooler is keeping oil bang on the middle of
the gauge (about 90 something degrees). So the new bearings should be happy. I installed them with assembly lube and spun it without plugs in until
the idiot light went out so first-start oil pressure was fine.
I spotted a momentary dip in pressure (about two seconds while idling) when it first got hot and the oil thermostat opened so the air in the hoses to
the cooler came into play but not sure how you could avoid that, it's impossible to completely fill those?
I kind of agree, can't think of a reason they would need running in, except possibly if I've buggered something up and it lets go in the
first few hundred miles, I'd rather it did it at running-in revs than at the redline. But obviously that's not going to happen, have to
try and think positive with engine #3...
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