R/C Tech Forums - View Single Post - Engine tuning 101
View Single Post
Old 12-04-2003, 05:52 AM
  #8  
ziggy12345
Tech Master
 
ziggy12345's Avatar
 
Join Date: Jun 2003
Location: West Midlands, UK
Posts: 1,596
Default

Deffinatly rich on the low side and lean on the high

If the low end is rich the motor will idle ok and there will be a large volume of mixture in the crank. This takes time to clear into the cylinder, about 2-3 secs so as you apply the gas the mixture in the cylinder will get leaner and leaner.

To adjust your low end let the car sit at idle and apply full gas for 2 secs and release. If the engine returns to fast idle then drops to slow idle the low end is to rich.

Lean out the bottom end then try again until the engine returns to fast idle and stays there. Adjust the idle screw to reduce the idle revs down.

You now need to richen up the top end. Open 1/4 turn and try again

Another cause of overheating is to low a compression ratio. check the head clearance.

Cheers
ziggy12345 is offline