Robin Engine 500 Hour Maintenance

[FOURTEEN]

</font><font color="blue" class="small">( I doubt it or any other carbon removal is necessary as routine maintenance on Robin or Kohler PT engines.
Water injection is good to avoid detonation in blown race engines)</font>


<font color="red"> After I get the blown injected Hemi installed in my PT-425 I may consider water ingestion, or water injection, or pulling the engine apart every 500 hours to look for carbon!

Until then I will change the Amsoil oil and Amsoil filter regularly, use a good high detergent gasoline with Sta-Bil, verify that the choke fully opens ASAP, clean and change the air filter regularly, check and change the spark plugs periodically, watch for any unusual sounds, smells, smoke, or heat emanating from the engine, and expect a long and happy useful life from my PT!!

</font>

 

[BobRip]

I apologize. That was supposed to be a little joke. Probably too little.

I appreciate everyone's comments.

Bob Rip

 

[BillCroasmun]

</font><font color="blue" class="small">( ...and there are volumes of debate about whether the water itself boosts usable power. )</font>

Charlie,
I have had one experience that has made me a believer of this. I used to own a Suzuki Samurai (actually 2 throughout the years). If you don't know anything about this vehicle it's a very capable but highly underpowered "Jeep" style 4X4. This thing ran at it's peak frequently, for instance while doing 65 to 70 MPH on the freeway if you went up much of any incline you could not maintain your speed. There were certain stretches of road you would just get used to certain patterns (floor it here, lose 7 MPH until you reached a certain spot then it would speed back up to where you could let up on it).

On misty/rainy days when there was more humidity in the air the Suzuki would either not lose the speed at all or lose partial speed and recover quicker. I had friends who didn't believe this until I put them behind the wheel and I could tell them exactly what they would experience with the pedal to the floor by what the weather was. Hey believed them and the only thing we could come up with was the difference of the amount of moisture in the air. Strange but true.

 

[ontheweb]

Moisture on the road reduces friction slightly and could lead to slightly more available power. At least, in a physics book.

OnTheWeb

 

[J_J]

It is the moisture in the air that makes the difference. I believe the moisture in the air, will increase the volume of air when it explodes in the combustion chamber. It will help keep pre detonation down. They sell kits to add moisture to the air at the carb or injectors. A lot of race cars use them . There are plenty or articles on the web. Take a look.

 

[toolz_not_toyz]

</font><font color="blue" class="small">( It is the moisture in the air that makes the difference. I believe the moisture in the air, will increase the volume of air when it explodes in the combustion chamber. )</font>

Increased humidity = Increased density. Another way to look at it is this: water contains oxygen. Add water and you add more oxygen.

 

[Charlie_Iliff]

See - I told ya there was a lot of debate: /forums/images/graemlins/grin.gif /forums/images/graemlins/grin.gif Sorry, the oxygen in water isn't burnable. It does slow the flame front, however, spreading the power over more of the stroke, thus increasing usable power in some combinations of combustion chamber shape, compression ratio and stroke to bore ratios.
It also reduces detonation, so those engines with knock sensors can run leaner with more spark advance and with more boost.
Whether the expansion of the steam in the combustion chamber helps is argued all the time, but at 540 calories per gram soaked up by phase change before expansion, it's a question whether there's a net gain.
Moist air going through the restriction in a carburetor tends to cool the incoming charge as small droplets evaporate, resulting in denser charge - more air and fuel.
Lots of other theories, but not enough gain for any of us to be carrying water tanks around on street cars or tractors.

 

[BobRip]

Well, today I warmed up the PT422 engine and sprayed a littled water into it. I did not see any smoke or unusual stuff come out. I sprayed some more and nothing. I then drove it around the property to put some load on it. Perhaps there is very little build up. I am so glad I did not pull the heads. I need to order some gaskets for the valve covers before I adjust the valve backlash.

Thanks to everyone for their comments.

Bob Rip

 

[toolz_not_toyz]

I say forget the water anyhow. Just go and add a Nitrous Oxide kit with a big red button! (Under a protective cover, of course.) /forums/images/graemlins/grin.gif And you could have a red fire extinguisher strapped to one side of the ROPS and a blue NOX tank strapped to the other side. /forums/images/graemlins/wink.gif

 

[BobRip]

That will definately increase wheel motor torque. Why don't you test this and let us see the video.

Bob Rip