hi

my car works fine if im under half throttle, but if i speed up for a couple minutes it overheats. i dont think im too lean. what else can cause overheating?

How hot is it running-do you have a temp guage
[link]http://www2.towerhobbies.com/cgi-bin/wti0095p?FVPROFIL=++&FVSEARCH=temp+gauge&FVPROFIL= ++[/link]
What engine do you have, what size is it
What fuel are you running
Did you cut a 2" hole in your windshield to let the air cool the engine???

i dont have a temp gauge, i just put a drop of water on top of the engine
the engine is a dura trax dtx .18
fuel is top fuel 20%
im running with the top off

Thanks for your imput
It your getting a little smoke from the pipe you should be fine but you might richen a little if it slows down on top end then put it back where you had it. If you can find someone with a temp gauge you can borrow check to see if its hitting up around 300 degrees thats to hot.

IS this your engine
NOTES FROM OUR TECH DEPARTMENT
This is the DTX .18 Engine with Rotary Carburetor and Recoil.
It has the same mounting and muffler dimensions as the OS Max .12CV
2 Year Warranty

FEATURES: ABC construction, Aluminum piston with Chrome plated Brass
cylinder liner.
Rotary carb
Recoil starter
Ball bearing-supported crankshaft
Heavy duty con rod
Side exhaust
Duratrax Silver Sport glow plug, available separately (DTXG3001)
Natural aluminum (powder coat) 7-fin cylinder head

INCLUDES: One assembled DTX .18 engine with rotary carb and recoil starter
One set of instructions with parts list

REQUIRES: Muffler (exhaust system) depending on vehicle
Air filter
Fuel filter
Starting equipment
Fuel: 5% - 20% nitromethane content

SPECS: Displacement: 0.18 cu in (3.0cc)
Weight: 8.64oz (245g)
Bore: n/a
Stroke: n/a
Power Output: n/a
Practical RPM: n/a
Crankshaft Thread: 5mm x 14mm
On-Center Mounting Holes, Front to Rear: 0.43" (11mm)
On-Center Mounting Holes, Side to Side: 1.24" (31.4mm)
On-Center Exhaust Mounting Holes: 1.08" (27.5mm)
Back of engine to front of drive washer: 2.23" (56mm) Excluding Recoil
Height: 3.25" (83.7mm)
High speed needle: 2 1/2 turns out from closed position
Low speed needle: Screw in until flush with outside of carb body,
then screw it in 1/2 turn.
COMMENTS: The HGIC9301 yank eliminator fits onto this engine, but the modeler
is on their own to make it work properly.
[link]http://www2.towerhobbies.com/cgi-bin/wti0001p?&I=LXCLU2&P=7[/link]

yes that is my engine.

try shimming the cylinderhead lowering the compressionratio, or use something like 16% nitromethane. What type of exhaust are you using?

That engine should run fine on TF 20%

If it's overheating it's gotta be lean or it has an air leak.
I'd start looking for an Air leak first,
look around the Carb, needle valve, back plate for any sign of raw fuel

If that ain't it
Check you low speed needle it may be too lean as well
After you warm it up, pinch the fuel line about an inch from the carb, If it dies very fast 2-3 seconds it's lean on the bottom, if it starts reving and then dies after about 5-6 sec. it's OK

When all else fails go back to the factory needle settings and re-tune the motor
Good luck

I only had my car out for 5 min today and i broke my shock tower[sm=angry.gif]
I dont see any fuel leaking . when i pinch the fuel line the engine reves and then dies after about 5 sec.
car-nutz im ordering a temp guage, i'll post my temps when i get my car fixed.

Good deal that will help
You will like the temp guage you can temp anything with it track temp,esc temp, electric motor temp there alot of fun.

i got my car fixed, for about 20 min. i landed sideways and i broke my hub, now i have to wait until tuesday to use my car again. my temp was running 240 - 270, is that good?

270 is getting a little warm 240 250 would be best, I had to put a King head on mine it brought it down to 260 but i have a sirio .12 and it can run 260 fine.

is [link=http://www2.towerhobbies.com/cgi-bin/wti0001p?&I=LXFKR4]this[/link] head any good?

It should be fine there calling it a cooling head built for youe engine my head was 50 bucks so 30 bucks is a good deal