Originally Posted by
LonnyJ1950
Guys who race on really high bite tracks were using such high weight oils in the roll shock that it was locking. Tubes never lock because they hold the damper fluid in sheer. You can use a single tube if it gives you enough damping. The Trinity 22J car had a single long tube. But 2 tubes means you can get the same amount of damping with a thinner fluid and it balances nicely.
I'm not sure how "they" were able to lock the piston in the AE shock. I'm not even sure if it's possible except by using diff fluids. Since it's a flow through piston design it just moves through the fluid, there is no hydro lock since it damps in compression and extension. The piston does not compress the fluid.
It essentially works the same as the tubes but keeps the dirt out.