2 Stroke Or 4 Stroke Options

[Jumpus GooDarus]

no GPS Fed i think it dose about 28 or 30 k's maybe

Boy poly you have alot of Katsika's in your goat

How many Billy's chase them ??

[poly]

Boy poly you have alot of Katsika's in your goat

How many Billy's chase them ??

??????????????????????????????????????????????

[Fed]

This is the part that's got me scratching my head RDnR.

To start, Horsepower is simply a mesurment from made from torque ie:

Torque x RPM
HP = ------------
5252 (= 33000 foot pounds per min = 1hp , at 5252 HP and Torque are always equel)

[Spudly]

That is Exactly how horsepower is figured out...

Horsepower = The engine torque x RPM , Divided by 5252

i forget the tecnical name for the it but at 5252hp torque and horsepower are always equel
as the HP and the Tourqe rise they meet at this point.

On the engine the horsepower is always going to be stated as a MAX Hp.

My argument is that 2 stroke engines hold there MAX or close to there Max HP for a much longer time through the Rev Range. Due to the Cycles of the engine. The 2 stroke engine delivers power more often that the 4 stroke engine, thus giving it greater torque, and there fore a better range through the power curve.

[Jumpus GooDarus]

??????????????????????????????????????????????

Katsika's are Nanny goats poly

We were sitting hear trying to figure out what the k's in

no GPS Fed i think it dose about 28 or 30 k's maybe

Stood for & assumed they were Katsika's

[Spudly]

I would think she would go faster than that poly.

Our boat with 30hp on it does 40kmph. 30km's is only around 20 knots.

[Fed]

You must be right RDnR, I read it on the internet.
http://www.v8914.com/Horsepower-v-torque.htm
I can't believe I got this old without knowing that stuff.
I think I'll have to read it a few more times to get my head around it.

[Spudly]

Yea thats a good article! Ive only skimmed through it though...

[poly]

Our boat with 30hp on it does 40kmph. 30km's is only around 20 knots.

you are most likely to be right chad how much dose your boat weigh, the poly is 264kg's +my 73kg's +possum and no i will not reveal her weight + about 25kg's of gear not to mention fuel 50lts 10lts of water, one of these days i will get around to weighting her, i think i need a bigger motor

[poly]

I am giving an update on the new motor for any one how has not been following this thread i replaced the 30hp 2stroke on my poly with a 40hp 4stroke and the diferance is amazing.
there were two main reasons for the change (1) hole shot as the 30 was struggling to get her up (2) noise was excessive being a tiller steer it made it impossible to hear people talking to me, top end speed was not a real factor in my thinking as i am one of those people how like to sit back and enjoy the ride.
the motor now has 8hrs on it so i gave it a run from stop to full noise hole shot was excellent the boat lifted quickly and easily to the plain and accelerated to about 50 or 55kmh, which i feel is a bit to quick for the hull.
noise was my other main reason for the change the Yamahar is very very quite.
am i happy with the motor, u bet i am now only time can tell just how good the motor is

[Spudly]

After all our discussion im glad that its worked out poly, how did you go without the other thing you were talking about adding? Im assuming the boat sat nicley in the water?

Good Stuff

[Jumpus GooDarus]

hole shot was excellent the boat lifted quickly and easily to the plain and accelerated to about 50 or 55kmh, which i feel is a bit to quick for the hull.

Doubt very muck you've goten any more speed poly & yes the 4 banger wull get you up quicker you'll find the smoothness of the 4 stroke gives the illusion that you are going quicker thats all.

And since you can only gauge speed by feel you'll never know what the speed difference is you really needed a gps