Hi, what could cause little knocking sound when starting cold engine, and when its colder it takes little bit longer when it shut's up :D on summer time when it's about 15 degrees celsius it takes about 15secons little knocking and then shuts up as engine starting to warm up.
all started last year, when I built m20b28 stroker, m52b28 crank, m20b20 rods and m20b25 pistons, after about 15000 km's was driven on that engine, it started to do this thing.
then engine was disassembled for winter rebuild, nothing wrong was noticed, just piston rings were pretty worn out (honed block, but didn't changed rings, not smart, but, done that :D), thought that rings was the reason.
So changed all bearings, piston rings etc, but already at first start at winter sound was still there.
rod small end bushings looked ok. rockers are dialed in 0.25, valvetrain sounds smooth and silent.
only thing was 2 rockers, that had liiitle more play than others, they both had one streak from one side thru to other, but I don't think, that that could cause that.
Form me, It feels like sound comes from bottom end, but from where...
all started last year, when I built m20b28 stroker, m52b28 crank, m20b20 rods and m20b25 pistons, after about 15000 km's was driven on that engine, it started to do this thing.
then engine was disassembled for winter rebuild, nothing wrong was noticed, just piston rings were pretty worn out (honed block, but didn't changed rings, not smart, but, done that :D), thought that rings was the reason.
So changed all bearings, piston rings etc, but already at first start at winter sound was still there.
rod small end bushings looked ok. rockers are dialed in 0.25, valvetrain sounds smooth and silent.
only thing was 2 rockers, that had liiitle more play than others, they both had one streak from one side thru to other, but I don't think, that that could cause that.
Form me, It feels like sound comes from bottom end, but from where...
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