Venting the Body for the Engine
 

Is it required to ventilate the body ( by cutting out the windows) in order to keep the engine cool if so how much and where is the best. Any help would be great!

Venting the Body for the Engine
 

Yes, definitly. If you dont you might kill your engine on the first run. At a minimum cut out the engine side window and a hole (at least 1 1/2 inches) in front of the engine on the windshield. Also cut a good portion of the rear window out.

It is recommended that you cut out the engine side window (or both) and most of the front windshield (if you race it I think the biggest is a 2 inch hole). You must also cut out most of the rear window. If you don't race its best to cut out most of it out.

Venting the Body for the Engine
 

make sure u dont cutt an hole in the back (window) of a body because the air will flow right through it causing no effect. I ve seen on it runs very very hot

Venting the Body for the Engine
 

No you want to cut a hole in the back. if you don't then the air will not flow as well and will not help cooling as much. If the air can get in but not out its not helping anything. Another thing is that if you don't the air will come out of bottom of the car reducing handling capabilities.
Basically if the air cannot leave the body the hot air will get stuck around the engine with nowhere to go. Then your not cooling a whole lot. It does in no way neutralize the effect, it does exactly what you want it to do, bring air over the engine, take heat from the engine and leave the car for new cold air to come in.

Venting the Body for the Engine
 

If you want to keep your engine as cool as you can (for longest life and possible best performance), cut out the entire front and rear window (don't need the sides if you cut all the the front and back but it won't hurt, just make the part between the windshield and window is thick enough it won't break). This provides a similar effect as if you did not have a body on the car and trust me the difference is alot.

Venting the Body for the Engine
 

Yes, cut out the rear, if you dont it will cause drag and lift which will make your car slower and handle like a hoover craft

Venting the Body for the Engine
 

Don't cut out the side windows. Doing so only allows cooling air- flow to go sailing out the side windows, doing nothing to cool the engine. Cut out about half the windshield, and half of the rear window, both cutouts should be on the same side as the engine. This forms an airflow tunnel that channels cool air right through the head's cooling fins.

Venting the Body for the Engine
 

how come someone didnt mention a nice custom desinged ram air cooling.

ram air in a real car use it for air intake for compression.

make ram air intake for rc cooling.

I did this for a aerodynamic science project way back in high school. It wasnt for rc cars but same idea.

Take a nice high speed fan and do some wind tunnel tests. A smoke bomb works awesome in letting you know where air is flowing.

Take some 3/4 inch rigid tubing (pet store, craft store) and cut 1 pieces long enough to reach from the engine to the front of your car.
Cut out your grill and create a tunnel with the tube for the air to flow right to the engine.
Heck you could even fabricate somethign that could cover the whole grill (LIke a vacuum attachment for cleaning small areas.) that could then fit onto the tube.

Walla Ram Air Cooling !!

You could even add a secondary chamber goign right to the carb.
More air intake means more fuel means more hp.(lol then figure out how exhaust)

Then when you hold the contraption up to the fan, do some tests. Cover the windshield cooling, turn the fan on and light the smoke bomb.
Watch it flow right into and past the heat sink.
Then try it with windshield cut outs uncovered.

who knows.
one of you guys in the south where its legal to buy fireworks give it a shot. Or send me some smoke bombs and ill try it. hell i got nothign else to do all day.
You can also test basic aerodynamics.

Venting the Body for the Engine
 

Heres what I really want to do..

1) Cut out front windshield
2) Put in a computer fan grille
3) use plastic to make a sort of funnel to channel the air throught the cooling fin
4) air goes out through a relatively smaller opening in the back

This should first of all filter the air coming in, increase air availability to the engine (for combustion) and increase the velocity of airflow around cooling head for better cooling!!

Please tell me what you think. I think I'll paint the grill black to make it blend in with the car

-ram

Venting the Body for the Engine
 

I've used the computer fan inside the body and it worked pretty well but I didn't fabricate any kind of tubes putting it straight into the intake...

Venting the Body for the Engine
 

Add these.. This one ports air directly to my Air Filter...

... or so I like to think... ;)

Venting the Body for the Engine
 

The problem with cutting out large sections of the front and rear windows is with downforce. The more windshield you trim, the less downforce you get. All you really need to do is make a circular hole 1 1/2 to 2 inches in diameter in the windshield directly in front of the engine and a similar hole in the rear window directly behind the engine. If more cooling is desired, remove as much of the side windows as allowed by your local track (if you're not racing, remove as much as you want). Removing the side windows improves airflow under the body and will result in a cooler engine.

If your local track allows, make a vertical slit in the side window (from the top to the bottom of the window) just in front of the engine. At the both ends of the slit, cut rearward about a half inch (this should form a clear flap from the side window material). Fold the flap outward between 30 and 45 degrees. Voila, you've created a fully functional air scoop.

Using the side window for an air scoop and a 2 inch hole in the windshield and rear window is just as effective cooling wise as removing the entire front windshield without the negative impact on downforce.

Venting the Body for the Engine
 

Real quick... Shouldn't the rear hole be larger for less drag, and to create lower pressure to help "Draw" air through?

Venting the Body for the Engine
 

Actually.. If you dont cut the windshield off you have MORE life than with!!
If the body is left untouched, you have high speed airflow up top and low speed down bottom.

The real solution would be to probably take air from down below!
An air dam of some sort wouldbe best, but takin in air from down below is pretty wierd cuz then you'd be taking in all kind in dirt.

I guess the best way would be to put an air cleaner and have a massive intake on both sides of the wheel!

something like

--- --- --- --- --- --- ---
/ \ / \ / \ / \ / \ / \ / \
|| || ||| || ||| ||| |||

This way the airflow will be there but the dirt will go throug and not "turn" through.. I'm gonna give this a shot!!

-ram

Venting the Body for the Engine
 

You are correct. In theory, a larger opening in the rear window will create a low pressure zone resulting in increased cooling. In practice, the effect is negligible as it is not a closed system. Any potential pressure difference vents under the rear bumper, through the rear wheel wells, and well, the entire underside of the car. I go with a 2 inch hole in both the front and rear windows as 2" is the roar (and my local clubs) legal limit for the windshield.

When I ran at the HPI challenge, they didn't want more than a 2" in the rear as well.

Venting the Body for the Engine
 

Huh?

Venting the Body for the Engine
 

lol..

The reason sports cars sit soo low is because they want to avoid ANY air going down below. This along with the spoiler produces insane downforce. Most F1 cars can theoretically run upside down as long as the speeds are in excess of 100 MPH!!

Of course I'm not familiar with ROAR and IFMAR limitations, please educate me!! Wait you already posted that up above!

BTW this is just my theorization.. rebuttals welcome :)
ram

Venting the Body for the Engine
 

Huh?

Venting the Body for the Engine
 

God damn it mike.. hehe
ram

Venting the Body for the Engine
 

;) You seriously lost me on this...

When I get home I'll dig up my Ram Secret Decoder Ring, and see if I can decode some of this...

hahha

Venting the Body for the Engine
 

I cut out the grill, headlights, side windows and replace with screen, also cut lower part of the rear car/truck high. Been running a HPI .12 for 4 or 5 years. Not worried about looks, with me driving, looks don't last long.

Best regards, Charlie

Venting the Body for the Engine
 

Added bonus, gives the car/truck that Paul Newman, hockey team bus look.

Cooling
 

I always run my car behind my 30% edge 540 airplane the 22 X 10 prop turning at 6840 rpm allows for the proper wind force to be sucked through the body of the car and blown across the motor....However i don't reccomend this for everyone I have $2200.00 rapped up in my automatic car cooling fan!

It also proposes a major draw back on the track, trying to get that airplane to cut the corners and take the jumps is a real pain! But on a good day my engine hauls butt and maintians about 125 degrees.

Tom


















yah right!

Re: Cooling
 

Is this the new hip way to respond? ;)

Venting the Body for the Engine
 

I think you started a trend...