Athena 47.6 piston, no window?

Neil Burgess /

Just wondering if I should add one or not. Was surprised, all my hobbit pistons have the aux port window but not this one. Athena probably knows their stuff- But if there's added benefit....

Thoughts?

Re: Athena 47.6 piston, no window?

on third transfer engines they don't need it, because the booster is fed from the cases. depends on if there is porting from the skirt into the booster or if you add it.

you'd definitely want the top of the skirt open to transfer and the piston scalloped to match it but i cant remember without looking at it if you end up cutting the piston or just scalloping it out.

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