Quote:
Originally Posted by Vegas69
Definitely over square...been through this whole analysis.
|
Over square is where the bore is larger than the stroke
Quote:
An engine is described as oversquare or short-stroke if its cylinders have a greater bore diameter than its stroke length - giving a ratio value of greater than 1:1.
For example an engine which has 100 millimetres (3.94 in) bore, and 80 millimetres (3.15 in) stroke has a bore/stroke value of:
100 mm / 80 mm = 1.25:1
|
Since my bore is 4.165 and my stroke is 4.250 the engine is really Under Square.
Quote:
An engine is described as undersquare or long-stroke if its cylinders have a smaller bore (width, diameter) than its stroke (length of piston travel) - giving a ratio value of less than 1:1.
For example an engine which has 90 millimetres (3.54 in) bore, and 120 millimetres (4.72 in) stroke has a bore/stroke value of:
90 mm / 120 mm = 0.75:1
|
That's from Wikipedia.. but I double checked a few places. it's under square.
But these days that's pretty common. Take the Tall Deck RHS block. The max bore is still 4.165 but you can go 4.600 on the stroke and that's WAY under square.
I'm comfortable with the .977 ratio of my bore/stroke ..
Will be interesting to see how the two builds play out and how they compare to the 1.00 square 440 I just finished.
And keep in mind.. I'm NOT and engine building expert.. I just know lots of smart people to brain pick.