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Which way towards exhaust on this piston?
Posted: Sat Dec 14, 2019 10:29 pm
by Davidsquaredson
It’s a Borgo piston from my s3tv175. I wrongly assumed the crown had an arrow. Can you tell from the skirt which is the exhaust side?
Thx
Re: Which way towards exhaust on this piston?
Posted: Sat Dec 14, 2019 10:34 pm
by Norrie Bodge
Look at the ring pegs
That side goes towards the carb inlet port on your cylinder
Re: Which way towards exhaust on this piston?
Posted: Mon Dec 16, 2019 5:52 pm
by Warkton Tornado No.1
Norrie Bodge wrote: ↑Sat Dec 14, 2019 10:34 pm
Look at the ring pegs
That side goes towards the carb inlet port on your cylinder
Not only that, but the large frame engines have specific piston skirt cutouts that are asymmetric to align with the crankcase & cylinder transfer ports.
I have no idea of the worth to cutting the piston & cylinder so that the edges of the piston cutouts align precisely with those of the cylinder, but I always do so. Every little bit helps.....
