How much cc for my bore?

[Dinner]

Hey, i just called to see what my shee is bored to, and the he said its at 75.50, so how many cc would that be?..thanks for all help

[Ducman]

To calculate volume of a cylinder you use 2 ( Pi )( r^2)(d)

 

Assuming stock stroke, 54mm = 5.4cm and r= (bore/2) = 37.75mm = 3.775cm

 

so 2(3.14)(3.775^2)(5.4) = 483.5 cm^3

 

 

that is 483.5 cubic centemeters = one fat hog of a cylinder!

[Dinner]

Thanks Ducman for the calculation

[Dinner]

Just had a thought..or could he of ment it was bored out to 75 thou, does that make a difference? ..im no good at cc calculation

[Ducman]

I forgot to mention the 2 in my previous equation is because there are 2 cylinders.

 

Well if you dont have some sort of aftermarket cylinders there not going to be bored to 75.5mm. A typical big bore sleeve kit will take the stock cylinders to 68mm which is 392cc. If they are bored 75 thousanths over (.0755) I guess this would be fore a .060 over piston which would be a 65.5mm piston.

 

So the cc for a 65.5mm piston would be 364cc

[blueshee03]

that 364cc sounds more realistic to me.i'm running thick walled sleeves and they can be bored to 72mm maybe 73mm .they are .40 over or 65mm now.

[eehsnab2]

Here's the formula...

 

bore x bore x stroke x .0007854 x 2 = displacment for a banshee

[Dinner]

Oh ok, thanks guys ...didnt think it made sense before, but that was on my part...but thanks for the calculation