I'm working on a project for school and need the bore and stroke of the 160 and 170 DZ engines. The manuals are not correct as they provide a total displacement of 3.0 and 3.2, respectively.

Thanks.

Joe,

I just ran the numbers from the manuals on the YS site and they come out correctly. What formula are you using? Are you sure you are doing the conversion from cubic MM to cubic inches correctly?

My calculations on the 1.60 come out to 1.6066887577 cubic inches and the 1.70 comes out to 1.7064142668 cubic inches.

Pete

friends don't let friends drink and derive.........a bit of math humor.......

Thanks Pete. I am such a bonehead. Thanks for letting me know it's me and not the manual[&:]

Luckily I like math.

What do you think about summing the pitch and diameter of a prop and using that figure to quantify prop load? It seems to make sense to me based on how 'they' say to drop an inch diameter when increasing the pitch by an inch.
For example:
15x8=23
15x10=25
16x8=24
16x6=22

So the 110 would range from a 22-25 load. Obviously this is only for 2 blade props. I thought this would be a decent way to be able to compare two and four stroke engines since their power bands are different.