Topic: are these the same engines

[mickle missle]

i have a 16 hp vanny modle number 303777 and a 18 hp vanny with the same modle number303777 are these the same motors internally , the book i have says a the fisrt two numbers mean there both 30cubic inches is this right?

[Tom Fox]

16 HP has a 68mm bore with a 66mm stroke
479cc

18hp and 20hp has a 72mm bore and a 70mm stroke
570cc

[twigs-scrapiron]

I have a 303777 and it's a 14hp vtwin, I think briggs just made the motor a bit more efficient and got 16hp out of the same model.

[nor66]

16 HP has a 68mm bore with a 66mm stroke
479cc

18hp and 20hp has a 72mm bore and a 70mm stroke
570cc

With same moderl #???? They would be the same wouldn't they? Although I haven't seen a 303777 in the 20hp badges!

[Gary Elder]

So would that be 30 cubic inches for EACH cylinder of BOTH cylinders?

[nor66]

That would be 15ci per cylinder.

[Gary Elder]

then what would give one of these an advantage over a bigger single, like a 31?

[amcchevy1]

more torque. look at a chevy 396 big block compared to a 400 small block. big block has more torque while small block revs more. or better yet, chevy made 305cid 6 cyl. many yrs ago and compared to a 305 v8, the v8 was a weakling compared to the v6.

[fordman21]

The model #'s starting with 30 are 16hp engines.......models starting with 29 are 12.5-14hp engines although they are the same cubic inch as the 16hp.  18-20hp engines start with a 35 model #.

[nor66]

Thats what I was thinking.