decreasing running tempreture
 

Hi guys wondering if anyone can help me on one topic.

my engine would run really well lots of power but problem is the tempreture was running at 280 F.

now my idea is to gear my car taller hoping that it wont reach peak RPM but still have the crisp launch and top end, and was wondering if this will lower my temps?

You can add 0.05-0.1 mm head shim or use lower nitro content of fuel.

You can do what Daniz said.

If you do what you said, the engine will over heat even more. Putting taller gears makes the engine work harder to move the car, and the harder it has to work the hotter it will get.

thanks guys :D

i will do daniz24's idea and add a 0.05mm head shim as the nitro content im using is 16% any lower it would be pointless :p

and cheers for the tip on gearing nitrodude :)

you weren't far wrong though BT, if you lower the rpm you lower the friction between the piston and sleeve, bit like rubbing 2 sticks together to make fire lol the faster you rub the hotter it gets. I think what nitro dude meant is if you gear the car to hi it will put excess load on the clutch assembly and over heat and in turn raise the temperature of the engine.
I wouldn't bother with different gear ratios, just use the one that suits your track. just shim it as daniz24 said and run it a bit richer on the top end. also make sure the body is cut to give good air circulation for the engine to keep cool.

thanks Hesky yea i believe i have the right gearing for my track as its a small to medium size track, 2 netball courts.

if i richen my top end just 1/8th of a turn it goes back to being a bit rich. and problem with these stock kit motors (vones 3) if its slightly rich it wont kick into 2nd gear nicely. and the difference between slightly rich and perfectly tuned engine is about 1/8th of a turn on the top end screw.

Also engine is only about 1 litre old so still brand new. maybe i might need to keep running it in.

will update how i go :)

thanks once again guys cheers :)

if you have a spare bit of cash go onto the microlon website and get a tub of microlon, soak all the metalic parts in it for a few days, put it together and watch in wonder as your motor does not pass 140 degrees celcius!

id recommend getting the 16oz bottle and going halves with someone.

Hello VenomWorldOrder, did you mean 140 degrees celcius, because that's like 280 degrees fareinheit, thanks in advance.

thanks Tom yea i was thinking about that! ill try the shim idea first and try lowering my body even more so that the head gets a even more amount of air flow :)

thats it, do the easy things 1st! :nod:

Hesky, The higher RPM creates more heat due to the greater freaquency of combustion cycles NOT more friction! If you have friction between your piston and liner, your engine is about to seize. The piston should be seperated from the liner by a layer of oil. Some friction is present due to oil shear, but if there is actual contact between the piston and sleave, you have serious problems. As previously mentioned, too much load will also increase operating temp. As suggested, gear for track & try other routes to bring temp down. Increasing nitro can also bring temps down. This results from greater power outputs at richer settings.

a lower nitro content will actually make the motor run hotter

sorry, overlooked the most obvious.

Here are some stuff to lower running temperature that I use:

-Richen the top-end needle
-Richen the low-end needle [remember to lean the idle-needle atleast 1:6 of what you richen the low-end]
-Use more head shims
-Try other temperature guns.

If you havent done so already, take the side windows out of the body shell....this is usually worth around 10deg f in cooling.

change to M speed heatsink will solve the problem much better. trust me

thanks guys!
cant believe i overlooked that too hesky :p

Andy T: will taking out both my side windows cause any drag or slow me down the straights etc ? i remember someone telling me not to cut out my side windows as he said the less holes you have the faster your car would be.

Mie 3 : i think Mspeed dont make 11 fin heads for kyosho engines. ill have to look into getting a aftermarket head but i feel that the stock head provides enough cooling as its 9 fins.

weekend is coming so testing my car tommorrow will do the lowering body and head shim and see how i go. :) i will also cut out both my side windows if it doesnt slow me down :p

cheers guys :tire: :D

the mspeed heatsink doesnt has 11 fins but the material is different with others

It may cause a little more drag/air turbulence but I think the cooling benefits offered by doing this outweigh the tiny bit of drag it creates.
Have you removed the rear window behind the cooling head? This will significantly increase cooling too if you havent done it already.....you really want a good flow of cool air passing thru the cooling head.
Cheers

Hi guys

car was running perfectly today at 240-250 F so im pretty pleased!

the problem was that the 2 speed shaft was held tight with not much play in it. causing the whole spur gear system to have too much resistance to turn. which in the probably caused the 2 speed to kick in late making me having to lean the engine off for it to kick in... if that makes any sense!

still find it a touch on the rich side with the exhaust note but i believe thats how stock (pull start) kit motors are run.

thanks for everything guys :)