Hi Eric
50% increase in what ?
Bore will increase by 50% for sure. But the cylinder capacity will be 2.25 times greater I think ( ?? ) if the stroke is kept the same.
ie Vol = pi * r
2 * h will become
pi * 1.5r
2 * h
Say the original is 0.5" bore by 1" stroke the volume is pi * 0.25
2 * 1 =
0.196 cu. ins.Now 0.75" bore is p1 * 0.375
2 * 1 =
0.442 cu. ins.Which is about 2.25 times larger. ( Should be exactly 2.25, but I've used truncated decimals ..

)
If you want to scale the volume only, keeping the same 1" stroke, I get this rather clumsy equation
New bore
RADIUS = sqrt ( ( Scale factor * Original Vol ) / pi )
= sqrt ( (1.5 * 0.196) / pi )
= sqrt ( 0.294 / pi )
= sqrt ( 0.094 )
r = 0.306
So, the new bore would be 0.612 ins. to increase the vol. by 50%.
Which seems to work out ... unusually for me

Good Heavens ... 23:02 hs ... me bedtime bevvy long overdue .. I'm off ..
Where's Marv, when you need him most ??????
Dave BC