Is thier a rule of thumb?

[Ryan Declark]

I assume that at some point a larger pump like a 155mm with lets say a stock 701 would do nothing aside from cause a lot of loss on the bottom end due to a larger prop being spun and more water being pushed.

Is their a rule or thumb/gold standard to engine size and modification?

Im trying to figure out what to install for a surf/lake ski with a 701 in it.

 

[Sparkplug]

I rode a 701 xfr with a stock 155 for 2 years. It ripped. Could flip and roll flatwater. Don't remember what prop I had. Wanna say it was a 5/12

 

[Ryan Declark]

I rode a 701 xfr with a stock 155 for 2 years. It ripped. Could flip and roll flatwater. Don't remember what prop I had. Wanna say it was a 5/12

Thanks. I suppose my question is if i do no upgrades to the engine would i have diminishing returns for the pump

 

[OCD Solutions]

Will your hull accept a 155mm pump without serious modification?

 

[Sparkplug]

Thanks. I suppose my question is if i do no upgrades to the engine would i have diminishing returns for the pump

I'm not sure what your asking. But a larger pump can always be grown into. It's not like your going smaller in engine. A prop change is all you would need if you decided to add more power. The basic 701 package. Ie; head, pipe, ignition, prop. Will push a 155 pump just fine. I say it's a worthwhile upgrade if you can make it happen.

 

[Big Kahuna]

None of us can answer your question without more info......

TC Freeride sets up their demo Rickter Edges with 701's with no porting, Head, BPipe and OEM 155's. They freaking rip...... But that hull is designed for the 155.

 

[Ryan Declark]

None of us can answer your question without more info......

TC Freeride sets up their demo Rickter Edges with 701's with no porting, Head, BPipe and OEM 155's. They freaking rip...... But that hull is designed for the 155.

Ya im asking questions because im new, so sometimes i dont know the right question to ask. I think the answer to the question at this point though if a 155 is installed a prop can tune everything to manage more or less power.

 

[Ryan Declark]

Will your hull accept a 155mm pump without serious modification?

A V3 tigercraft is what im after so im assuming yes.

 

[bkspeedwerks]

OEM 155 with 701 in a quality aftermarket hull is a great first aftermarket ski setup.

 

[Big Kahuna]

Ya im asking questions because im new, so sometimes i dont know the right question to ask. I think the answer to the question at this point though if a 155 is installed a prop can tune everything to manage more or less power.

What hull is first question, you answered below! well, above!!!!!!! LOL. You will need to install a 155mm pump shoe. Should work good with the V3. I would at minimum add a head and pipe.

 

[kevbo]

A larger diameter pump always work better at low hull speeds. A smaller pump needs steeper blade angles, this along with less inlet area make the pump cavitate more at low speeds. A stock 701 will work fine with a 155.

 

[Myself]

Well a stock 701 in a huge XL700 runs with a 155 pump, so why not in a much lighter hull?