heat sink - hydro cowls

[Joe Warren]

Anyone ever considered building firewall within your cowl to keep the cooler air in front of the carb. maybe place some dry ice up front to allow for much cooler air flow. Our Current Cowls configurations allow for the engine bay to heat sink very quick killing power on a bad air day.

 

[dave roach]

Joe

Ever think about putting the fuel on ice and pump it your tank before you run.

Dave

 

[anthony_marquart]

Was that a joke Dave? Just imagine the needling issues as the fuel warmed, expanded and changed viscosity. Cold air is dense though..

 

[Joe Warren]

I was recently talking to a owner of a Hi Performance jet ski Engine tuner & racer. This customers buy new ski`s at 15,000 and spend another 15-$20,000 on the Engine alone day 2. Increasing Superchargers installing turbo chargers amd High compression pistons, Motec fuel management systems with NOS. Some of the mid modded skis with just increased Supercharger Boost and More Fuel ( larger injectors) can run with the Wacked out machines by Packing the front of the firewall with Dry ice. They DO NOT allow the heat sink of the engine compartment to heat the air coming into the intake on any High performance application. Many American Sports cars pumping out High HP Numbers have had Cooler Air entry for 20 years plus. Google: Seadoo RIVA Performance to see some $30,000 plus jet skis at 400Hp to 600HP at 3 cylinders. The interesting point in all of this when everything else on a jet ski is Fixed. No Strut adjustment,cannot change attack angles on sponsons, They just make More power to Go faster. Cause the boat is less adjustable. More Power Does = Speed!!

 

[Ron Zaker Jr]

Joe

Ever think about putting the fuel on ice and pump it your tank before you run.

Dave

People laugh, old F1 Pylon trick from the 70's, they all had coolers full of high nitro fuel prior to heat race..

 

[anthony_marquart]

I would try the dry Ice trick before icing the fuel.. I never cooled my fuel... so I guess I don't really now.. but sure seems like that could have some ill effects as the fuels changes temperature in our application... but who knows.. Maybe Ill pack a little tub of dryice next to my carb in my rigger..

 

[Ron Zaker Jr]

Anyone ever considered building firewall within your cowl to keep the cooler air in front of the carb. maybe place some dry ice up front to allow for much cooler air flow. Our Current Cowls configurations allow for the engine bay to heat sink very quick killing power on a bad air day.

Joe, I think there is an article somewhere on this topic.(maybe in Model Aviation magazine) I know our group messed with using different ducting and plywood air diverters to move the air around inside the cowl. Amount of air entering in and the amount of air exiting, packing the air, things like that. Stu and Andy may have messed with this also. It was tough to really get a hold it of due to changing speeds during a race, The dry ice idea, now that may be a way to make it constant.

 

[Brian Sorgente]

There were a few guys in our district a long time ago that used to keep their fuel cans in nice form fitting styrofoam containers. I doubt they "chilled them" but Im sure they were cooler than everyone elses fuel that was sitting in the sun.... I wonder how much of a difference it would make...Or what might be accomplished/ intended by doing it. Cooler air is one thing, but cooling the fuel isnt something I've really thought too much about.

Brian

 

[anthony_marquart]

I really might try this dry ice thing tomorrow. about a 1in chunk in some aluminum foil.. before I do this,. I better make sure I read up on dry ice.. it's just water right? I better google it.. I can just imagine some crazy reaction inside the hull,.. with oil and alcohol or something..

 

[tnrcboatracer]

Dry ice is frozen CO2. As it evaporates it sublimes to carbon dioxide gas, displacing oxygen. Don't ever store dry ice in a walk in cooler. People have suffocated and died that way.

 

[anthony_marquart]

Dry ice is carbon dioxide. NOT what we want to have a whole lot of going into your motor... The way I understand it we need more oxygen.. wonder if the cooling of the air inside the cowl would out way the additional carbon dioxide.. Either way,.. the witches smoke oozing out of the cowl when you brought it in would be really cool..

 

[mike walker]

We do those kind of things all the time on the drag bikes. when temps are high are the air is bad.

A cool can to cool the fuel line works best for me

 

[stan simpson iv]

Anyone ever considered building firewall within your cowl to keep the cooler air in front of the carb. maybe place some dry ice up front to allow for much cooler air flow. Our Current Cowls configurations allow for the engine bay to heat sink very quick killing power on a bad air day.

Joe, I think there is an article somewhere on this topic.(maybe in Model Aviation magazine) I know our group messed with using different ducting and plywood air diverters to move the air around inside the cowl. Amount of air entering in and the amount of air exiting, packing the air, things like that. Stu and Andy may have messed with this also. It was tough to really get a hold it of due to changing speeds during a race, The dry ice idea, now that may be a way to make it constant.

Cooling the fuel...been there.

 

[anthony_marquart]

So your telling me that as the fuels warms through the race that the expansion and change in viscosity doesn't cause the boat to go rich or lean? I can definitely see cooling the air somehow..

I mean, just from the time you filled the tank to the time you go to start the engine, I would bet the fuel is flowing into the carb from the expansion of warming.. Maybe it's not as much as I expect.. and maybe in bigger engines would not be effected,.. seems like a .12 or .21 would have real issues with this.. they are hard to get running well already!

 

[Jeff Schindler]

Where else could heat enter the fuel system?????

$37 bucks and you can try this,

http://www.amainhobb...aust-Gas-Cooler

Me, I just don;t see the benefit of having cool fuel. Joe's point is a good one, if you can make better use of the cold air, you may see some gains. Remember, our racing surface can be 20 deg below ambient. Now take our boat engines off the water and onto sun baked asphalt and that might be a different story. This is why we cut the cooling fins off the car motors.

 

[dave roach]

Try cooling the fuel you will like it as hot as it is. Been there and done that.

Dave

 

[Glenn Gates]

Dry ice is frozen CO2. As it evaporates it sublimes to carbon dioxide gas, displacing oxygen. Don't ever store dry ice in a walk in cooler. People have suffocated and died that way.

Yep, It will suck the oxygen out of your boat . Another approach may be the use of a fuel cooler to use the lake water to cool fuel. I first saw one and built a few in the 1980's- pretty simple really just route your cooling water thru the cooler and then thru the motor - put the cooler near the tank/carb. Should keep that area of the boat cooler. Dry Ice can be dangerous- never put it in a container with a tight seal-as the gasses expand it becomes a BOMB and it is expensive and must be stored in special freezers @ -80 degrees.

 

[SayMikey]

Roll another one just like the other one just pass that one to me and be a real friend. Joe go bend on the prop more bang for your buck

 

[Ray Sametz]

Roll another one just like the other one just pass that one to me and be a real friend. Joe go bend on the prop more bang for your buck

ROFLMAO

 

[Joe Warren]

Too late....