If the timing is advanced could or will the motor over heat?
How far advanced does the timing need to be to cause overheating? This is for a non-computer/carb motor.
Thanks for any reply.

 

The opposite.

If the advance is anywhere near right (i.e. set for max power and doesn't cause pinging), the engine will run cooler than it will with it retarded; more of the fuel energy released as heat by burning, will be converted into mechanical energy. The farther retarded the timing is below that optimum point, the hotter the engine will run. The reason for advance is to make the combustion process release its energy at the exact point in the engine's cycle that extracts the most power, which is to say, the point of least loss and greatest thermal efficiency.

 

If it's advanced enough that it's pinging, that will add heat to the engine. To overheat, well that depends on the cooling system. If the cooling system is really good, it will take care of the extra heat from bad timing (advanced/retarded too far). Just set the timing right and don't worry about it.

 

As long as we all have our "thinking caps" on, anyone want to guess why a lean mixture will make a liquid cooled engine run hotter, but an air cooled engine run cooler?

Yes, it's relevant, and may help you understand why retard/lean creates more heat in your car.

 

hmm, i always thought with a air cooled motor that richer makes it run cooler... since the fuel can carry away the heat....

then again, the only air cooled motors i work with are alcohol/nitro fuel based RC cars that have oil mixed into the fuel... so that might make a diff....

 

My old dirtbike!

 

yea.. like on dirtbikes..... im gonna take a guess and say that most 2 strokes will run cooler when slightly rich....*shrug*


athough i doubt your dirtbike ran nitro

 

I wish

 

I'm not sure about a two-stroke, but four-stroke aircooled (like old VWs. Lycomings, etc.) tend to run hot when rich.

 

care to explain why? is it because the head design makes it so the rich exhaust burns in the head or somthing like that?