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running in
Posted: Sat Jul 26, 2008 6:35 pm
by aupickup
ok so have now replaced all main and big end bearings on my engine
so do i have to run it in, if so what oil and what is the best procedure
Posted: Sat Jul 26, 2008 8:02 pm
by bmcecosse
Just RUN it ! And 20W50 oil as normal. Bearings need no running in - it's the rings/bores on new engines that need a bit of care.
Posted: Sat Jul 26, 2008 8:25 pm
by aupickup
ty
Posted: Mon Jul 28, 2008 6:59 pm
by Dominic
Just RUN it ! And 20W50 oil as normal. Bearings need no running in - it's the rings/bores on new engines that need a bit of care.
I'd personally limit it to about 60mph for a few thousand miles, and then change the oil again. I noticed a marked improvement in running, "zippiness"" etc after my new engine had done about 6000 miles. Faulty new main bearings were replaced after 2000 miles. Now it goes like a dream! (At least it will when I've finished rebuilding the braking system, rear suspension etc!)
Posted: Tue Jul 29, 2008 10:38 am
by bmcecosse
Yes - that's when new rings/pistons/bores - bearings need NO running in!
Posted: Tue Jul 29, 2008 10:41 am
by superchargedfool
bmc is correct if only bearings it makes no difference.
either way though use 20/50 as normal and change it early.
If had rings or pistons then yes run it in properly which is still normal oil, 1000 miles driving sensible avoiding using full throttle or high revs then change oil and enjoy it.