Why do Phantoms overheat so bad in comparison to other "CG" engines?

[francisjohn]

Title is self-explanatory.

 

[Gordy]

The jug has much worse cooling than standard CG jugs because it is based off a chainsaw jug, which is forced air cooled. On a bike the airflow for cooling is much less than with a fan off the crankshaft forcing air across the jug.

 

[Amwicr]

The jug has much worse cooling than standard CG jugs because it is based off a chainsaw jug, which is forced air cooled. On a bike the airflow for cooling is much less than with a fan off the crankshaft forcing air across the jug.

What if one were to add forced air cooling...

 

[Gordy]

What if one were to add forced air cooling...

It would likely have much better heat management.

 

[zean]

I would love to see forced air cooling on a CG jug. There’s no money in it because a person’s creativity and parts would be quickly cloned then sold from overseas as if it was their original idea.

 

[ImpulseRocket]

I would love to see forced air cooling on a CG jug. There’s no money in it because a person’s creativity and parts would be quickly cloned then sold from overseas as if it was their original idea.

I already have a couple of designs to add a basic fan. And shroud to the Phantom, or pretty much any other CG engine. I need to get my hands on a 3d printer to really test them out, but it basically adds to and/or replaces the magneto cover, adds a small 3-4 inch diameter turbine style fan with a simple shroud.

I haven't been in much of a hurry because the V4 Phantom is supposed to be a 2 piece jug and head. If that is the case, the addition of a head like the one made for the Phantom by Smolik will more or less eliminate the need for the fan.

Forced air cooling is a compromise as it requires sacrificing power to help cool the engine. It also tends to add a good 3 inches of width to an engine.

I based my design around a low drag, low volume design mainly to help assist with cooling while stationary. The fan turbine is only about 1 in in width, and with the shroud adds just shy of 2 inches of width. The other design I was working on has a higher output fan design of the same dimensions, but will definitely add more drag.

The latter may do a better job at wider throttle positions, allowing for sustainable higher speeds, but likely at the cost of a little power.

The fan and shroud are the easy part. Anybody could print those and be functional. The hard part is adapting the engine. Both the connection to the crank, and the pass through of the cover with a support bearing. There is a reason my designs haven't been shared publicly yet, and you mentioned it.

 

[Chainlube]

I already have a couple of designs to add a basic fan. And shroud to the Phantom, or pretty much any other CG engine. I need to get my hands on a 3d printer to really test them out, but it basically adds to and/or replaces the magneto cover, adds a small 3-4 inch diameter turbine style fan with a simple shroud.

I haven't been in much of a hurry because the V4 Phantom is supposed to be a 2 piece jug and head. If that is the case, the addition of a head like the one made for the Phantom by Smolik will more or less eliminate the need for the fan.

Forced air cooling is a compromise as it requires sacrificing power to help cool the engine. It also tends to add a good 3 inches of width to an engine.

I based my design around a low drag, low volume design mainly to help assist with cooling while stationary. The fan turbine is only about 1 in in width, and with the shroud adds just shy of 2 inches of width. The other design I was working on has a higher output fan design of the same dimensions, but will definitely add more drag.

The latter may do a better job at wider throttle positions, allowing for sustainable higher speeds, but likely at the cost of a little power.

The fan and shroud are the easy part. Anybody could print those and be functional. The hard part is adapting the engine. Both the connection to the crank, and the pass through of the cover with a support bearing. There is a reason my designs haven't been shared publicly yet, and you mentioned it.

A scoop and shroud mounted to the down tube to funnel the air across the cylinder, ala LC dirt bike.

 

[cloakedvillain]

Jayeraye did that and had good results.