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Hondachopper.com Discussion Board
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Questions and Answers SOHC CB 750s only
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Rear shocks
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Re: Rear shocks
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JLeather
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: 5885
05/07/15 3:40 AM
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There has been one or two rather *heated* arguments about the effect of lowering blocks on shocks, and why. What you've essentially done with the lowering blocks is change (reduce) the mechanical advantage the shocks have. The farther from 90* the shock gets with respect to the swingarm the softer they feel because the force isn't acting strictly vertical (the direction you need it). It's a simple trig function; Usable Load = Shock Rated Load x Sin(Angle to Swingarm). At 90* you get the full rated load of the shocks (Sin(90)=1). Stock shock angle is somewhere around like 15* off of vertical, so you're getting ~95% of the rated shock load. On the bike in your pic (I assume it's the one you're talking about with the lowering blocks) the shock angle is pushed to what looks like 30* off vertical, which reduces your load rating down to ~85%.
This reduction in shock force due to the new angle is somewhat negated by the fact that the mount is also moved farther back on the swingarm, which improves the mechanical advantage of the shock, but overall you lose shock force in the direction you need it (vertical). I suspect the reason lowering blocks are so hard on a stock shock is that the shock ends up moving too quickly. The spring is no longer stiff enough to prevent sudden/drastic movement of the shock, but the damper inside tries. Since the damper only acts on the end of the rod internally sudden compression of the stock shocks can bend the rod, and because you've reduced the mechanical advantage of the shock it no longer requires a substantial bump to cause sudden shock compression. You can do this even without lowering blocks, but it would take a huge hit on the suspension to do it (like a 6"x6" laying in the road).
I've never tried better shocks like Progressives with lowering blocks, but since they have stiffer springs they should be much less susceptible to the issues that stock shocks have with lowering blocks.
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Questions and Answers SOHC CB 750s only
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Hondachopper.com Discussion Board
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Questions and Answers SOHC CB 750s only
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Rear shocks
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