Feel­ing the Heat

I’m hav­ing trou­ble with my ni­tro truck run­ning hot. Do I need to ad­just the car­bu­re­tor or use a fuel with less ni­tro?

RC Car Action - - TECH CENTER -

If your en­gine makes good power and seems to run fine other than run­ning hot (as in con­sis­tently more than 300°F), then chances are its state of tune isn’t the real is­sue. But let’s check off the list: Richen the mix­ture by turn­ing the high-end nee­dle coun­ter­clock­wise an eighth of a turn at a time to see if en­gine temps go down with­out hurt­ing per­for­mance. Solved? Great. If not, other is­sues to check are air­flow and driv­e­train bind­ing. Make sure there’s a big hole in your truck’s wind­shield to al­low air to flow over the en­gine’s heat-sink head. Cutting out the area be­hind the en­gine helps, too, by al­low­ing en­gine-heated air to es­cape. With the en­gine off and throt­tle at neu­tral, give your truck a shove to con­firm it coasts freely. If it doesn’t, fig­ure out where the re­sis­tance is com­ing from and fix it. Com­mon cul­prits are drag­ging brakes and grass or other junk wrapped around the axles and/or drive­shafts.

Ni­tro ve­hi­cles need plenty of cool­ing air. Don’t skimp on the ven­ti­la­tion holes.

Make sure the brakes aren’t drag­ging when the throt­tle is open.

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