Why don't I ever see dyno's?

[Half flip95]

you guys are too smart for your own good.

what is the purpose of building these engines bigger and better? - to get more air.
you all seem to agree that measuring rpm, torque, and horsepower don't really capture what the flatwater freestyle rider is after - the most air possible.
I think this can easily be tested for.
imagine the strongman test meets superman the ride

build this rig in a test tank and see how high you can send her

 

[waxhead]

So your saying measure the power in metres, I,m liking it.
How much power do you have 2.5 metres, Or feet in your funny language

 

[Quinc]

Really comes down to there is not enough money in it and not enough competition to prove your product over the next.


http://www.x-h2o.com/index.php?attachments/dyno701sj09-gif.286495/

 

[bored&stroked]

if we just saw the torque curve with rpms listed. hp numbers could be not even listed. just a curve overlay of all motors tested

HP is just a math equation based on torque and what rpm the torque is made at. You don't actually measure hp.

 

[Waveblaster785]

I don't care how much hp your supra makes, it's still running 12s.

Sorry, got confused for a minute.


Sent from my iPhone using Tapatalk

 

[masterblaster]

HP is just a math equation based on torque and what rpm the torque is made at. You don't actually measure hp.

torque could be shown in the graph as 1-10 if it makes anyone feel better,the curve as a overlay is really all anyone should care about for freestyle/freeride, anyone here stessin for a few extra rpm or mph....
At least using the same pipe,most people have the same or sim carbs. Ign hmmm,anyone serious is using tl with a custom curve anyway. The jump height rig would be a better tool for pump power and efficiency. A motor making far more power and not setup well with anything in the pump would still get owned by a less powerful motor with better setup pump,prop,nozzle

 

[tntsuperjet]

You don't ride a dump, so doing pipe development strictly on a dyno for free ride is a loosing battle.
Reason being its impossible to simulate how the boat runs in the water and get a repeatable dyno run.
If I was building motors and wanted to have a bragging number I would throw a dyno sheet up.
But really it's a curve that says check me out I'm all that.
Besides. What do you need a dyno chart for when you have a performance guarantee that if it isn't better then any pipe you have return it for a full refund.
Or do you want me to take away the improvements from water testing and give you the dyno queen with no performance guarantee??

 

[bored&stroked]

Or do you want me to take away the improvements from water testing and give you the dyno queen with no performance guarantee??

Why not do things as you currently do and when finished throw the setup on a dyno? Take a completely stock superjet 62t, swap the pipe, and dyno the results. I don't see it needing to be a one or the other type of choice. I don't need to simulate how the boat runs in the water, the motor can go in a million different hulls that will change how the setup responds. Its a engine. Engines do the same thing, twist a crankshaft. I want to measure how much and where that twisting action takes place to give me an idea of how it works.

 

[Big Kahuna]

 

[masterblaster]

We are talking dynoing motors on the same pipe. Not developing a pipe.

Developing a pipe without a Dyno at all would be even more difficult

 

[Ducky]

Based on that chart....I see no reason why a B pipe commands so much more money than a type 9 pipe. Only thing I can think of is that the type 9 doesnt fit every hull?

 

[waxhead]

b-pipe has better throttle response

 

[Big Kahuna]

It mounts to the head, this not not a great thing on a ski that is going upside down. Plus it will not fit many of the AM Hulls.

 

[Ratking]

I don't see how the argument that there is many factors makes a dyno run with torque and hp numbers irrelevant.
It gives a baseline and a best case scenario, where as humidity and different temperature only makes it worse. But by comparing the motors with the same outside factors you know what performance the different motors give.
Also I see a lot of arguments without any proof. A jet ski makes huge air due to torque x rpm given to the pump. Nothing more than that. And that is a measurable parameter. The pump may or may not be optimal, but the input to the pump is the motor and that can be measured with a dyno. How can that not help understanding if a motor is optimal or superior to another setup/motor?

 

[Big Kahuna]

It really is irrelevant in a sense. There are some who are only going to buy X Scream, or DASA or Jetworks, or TPE or PHP............ Does not matter that one may make more power than another. or one makes more power at X RPM vs the other one that makes Y RPM at another. When setup correctly, all these motors make great power.

 

[DAG]

The funny thing is all these motors have been dyno’d, most builders will tell you. They just won’t give the data away

 

[yamanube]

@Tyrant1919 is working on one.

o2 sensor would be nice too for getting the carbs dialed in

Oxygen sensor will not work with wet exhaust.

 

[masterblaster]

It really is irrelevant in a sense. There are some who are only going to buy X Scream, or DASA or Jetworks, or TPE or PHP............ Does not matter that one may make more power than another. or one makes more power at X RPM vs the other one that makes Y RPM at another. When setup correctly, all these motors make great power.

This is deff true,alot of buyers will stick by their builders because of relationships and proximity.especially those talking them up and getting sponsorships and big discounts. No one would buy a motor that didnt make power somewhere for their style of ride though kinda irrelevant they all make good power.To have a graph with good reliable torque curves overlayed on many brands just like the pipe graph above,done on the same day with the same pipe...can't imagine that wouldnt drive more sales to the winner,especially if the price of motor was more competitive.

Imagine this being a event at daytona, it would have to be done with consumer motors,dont think for a sec the manufactures will participate.

 

[jason184]

I can make my dyno read whatever I want it to read. HP numbers are kind of irrelevant in any form of motor sports. Yes they are a great tuning tool but at the end of the day the true results show when the engine is put to its intended use, can't fudge those numbers.

 

[tntsuperjet]

This is the problem.
The ski had no direct connect to water.
So I have had my ass bitten more times then I will ever admit from dyno testing.
The motor in the water heats the pipes so differently then on the dyno. So you can't simulate how the motor runs in the ski.
I can tell you this.
I have 155hp dyno queen that gets its ass kicked all over the water by a 118hp motor.
When I pull the hp numbers and ripe temps and pressures off the dyno I can't get those in the water.
But I don't need a dyno to show me what my stats gun tells me in the water.
Nor does the dyno show me how easy I can flip a boat. If I pull the trigger and the boat flips on flat water without trim or makes it plate to plate with one setup and doesn't make it with another setup. My job is complete.
If the ski goes higher and pulls more combos I know I'm in right direction.