Bounc­ing Back

RC Car Action - - TECH CENTER -

QHow do I know if I’ve re­filled my shocks prop­erly? I’ve heard the shaft should pop back out af­ter you com­press the shock. Is that true? How far?

AThe amount that the shock shafts “pop out” af­ter be­ing com­pressed is called “re­bound,” and to be clear we’re talk­ing about com­press­ing the shocks with the springs re­moved. The amount of re­bound de­pends on the amount of oil in the shock. First and fore­most, you want to be sure you don’t have too much oil. It’ll be ob­vi­ous if you do, be­cause you won’t be able to com­press the shock shaft fully (or, it will be hard to com­press fully, then shoot back out quickly when re­leased). If you run the shocks with too much oil in them, you’ll either pop the cap off or blow out the shock seals. If over­filled, just loosen the shock cap and com­press the shaft, then tighten it when the shaft is about 5mm of fully com­pressed. The shaft should now com­press fully and eas­ily, then re­bound slightly. Rac­ers can ob­sess over this, painstak­ingly mak­ing cer­tain each shock re­bounds the same amount, but if you’re just fun run­ning it’s hardly worth wor­ry­ing about.

Right: Losi’s Shock Match­ing Tool (LOSA99170, $35) makes it easy to match your shocks' damp­ing.

Above: If you can’t fully com­press the shock, it has too much oil in­side of it.

Left: To bleed the shock, loosen the cap and com­press the shock shaft. Do this over a towel to catch the oil that bleeds out.

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