Articles

How To Match Your Shocks

In this article...
Page 1: Superior setup with help from Team Losi!
Page 2: Shock Length
Page 3: Proper Bleeding
Page 4: Checking Worn O-Rings
Page 5: Matching Your Pistons
Posted:  Tuesday, August 10, 2004
Provider Name:  RC Car Action
Issue:  March 2004
Written By:  Lito Reyes
Copyright:©2004 Air Age Media
(continued from previous page)
Don't go crazy when you sand the pistons. Knocking off the burrs left after the molding process is usually all it takes to eliminate any piston drag.

Many shock pistons come molded on a parts tree, and it's up to you to trim the excess plastic off them before you install them; even 0.5mm of material that isn't cut away properly can cause extra friction inside the shock. With Losi's Tool you can also match your shock pistons so that two will function identically. It's best to do this with a fresh set of O-rings, so match your pistons during the initial building or during a rebuild.

STEP 1. Assemble the shocks without fluid or springs and mount them on the tool.

STEP 2. Compress and expand the shocks. The gauge indicator will point away from the shock that has more piston drag during the compression stroke and toward the one with more drag during the tension stroke.

STEP 3. Remove the piston that shows more drag, and carefully remove any excess material by lightly sanding the edges; a Scotch-Brite pad does an excellent job of smoothing the edges of the shock piston.

STEP 4. Remount the shock and test it until the indicator stays centered during expansion and compression.

• Keep an extra set of shock mounts handy so that you won't have to remove the ones from your car when you use the tool.

• If you run cars that use a mixture of metric and Imperial hardware, also set aside a set of metric countersunk screws and matching nuts to mount on the tool when you match different shocks.

• Measurements will be most accurate if the shocks are mounted with the shaft parallel to the tool. You might need to use spacers on the upper or lower mounting positions, so keep a few pairs of different sizes handy. Washers will do just fine.

• The needle indicator on the tool is made of plastic, so take care to protect it, and make sure it's straight when you use it.

Team drivers will attest that the difference between a carefully built car and one that is hastily put together can be the difference between making the A-main and sucking it up in the B-main. Losi's Shock Matching Tool lets you use some of the same techniques as Losi's Team drivers use to get their cars to consistently perform at their best. The downside is that now it will be harder to blame bad shocks for your poor showing at the track.


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Ridgefield, CT 06877
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