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Never seen this before?
Posted: Tue Oct 03, 2017 10:44 pm
by cartmel808
Stripping an old Rally 200 engine down tonight & the old piston has scribed cross hatch markings scribed with a large dot punch to the centre of each - and these are all around the piston (see below pics)... never seen this before & just curious as to what purpose they serve?
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Re: Never seen this before?
Posted: Tue Oct 03, 2017 11:25 pm
by drunkmunkey6969
Old school idea for increasing lubrication. Not often seen anymore.
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Re: Never seen this before?
Posted: Wed Oct 04, 2017 9:56 am
by cartmel808
Cheers for enlightening me Dan.
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Re: Never seen this before?
Posted: Thu Dec 21, 2017 4:30 am
by dirtyhandslopez
Probably not a dot punch, might distort the piston. More like a drill bit. Nice little oil collector spot. Most just have the cross hatch in a smaller pattern.
