Will it be much difference in upgrading from 30 to 40hp?

AncientMariner · 06 April 2009, 12:41

Hi,
I've been thinking... is there a big difference in 10hp? I mean, upgrading from 30 to 40 hp will make much of a difference ?
The actual engine is a Mariner 30hp, the maximum recomended by Valiant is 40hp. It's a 33% increase in power, so the top speed must increase, but how much?

Cheers
Hugo

willfinch36 · 06 April 2009, 12:46

What boat have you got at the moment? what is the top speed of it with the 30hp

AncientMariner · 06 April 2009, 14:49

Hi
I have a Valiant Vanguard 400, top speed is 27kn.

uncle al · 09 April 2009, 14:16

it is easy to upgrade your obm but not cheap and your insurance could be affected give me a ring 01869 326411

reinier · 18 April 2009, 16:48

You'll feel the extra HP especially when out on the water with much load. If you want extra top speed you have to prop it right, otherwise it'll only accelerate faster. Expect 3 to 4 knots extra speed.

two stroke mick · 20 April 2009, 08:49

The only advantage to having the extera 10 hp is if you carry divers or a heavy load. You may find that the boat becomes unstable at WOT and 40 hp.