engine stroke

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GTi_Leo

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is the stock 30cc really a 28mm stroke? by my calculations if its only a 28 stroke and 36 mm bore its only 28.5 cc or is it a 30mm stroke.


reason I ask is because I bought a 4 bolt 30.5cc king motors head and crank case and want to use the stock HY crank and piston
 
I know that a normal 30.5 CY or Zenoah is 28+2mm for a 30mm stroke but is the stock HY crank the same. I ask because I don't want to put it in and have useless compression because there is 2mm less travel and more space to reduce the compression
 
long rod verses stroker cranks.

hi. here i am sorta - kinda off topic --- agan. the cranks we use from the factories are not stroker cranks. they are long rod cranks-- the 30 mm ones. what does a long rod crank do to the approate - correct cyclnder matched for a long rod crank? A long rod crank enables to spend more time before & after top dead center. same story at bbdc & after bdc. slower reving motor-- but this enables it to build power by increasing the amount of time the engine has to pull in fuel mix. but you guys allready knew this--- db
 
would anyone have an extra 30cc crank I can buy off them :) thinking of building both motors up, the HY really seems to be a built of solid construction, even as a 2 bolt
 
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