Carmelo
i just installed the B26 (NAPA VC-1765) on my L36 and my bushing was also toast. Without the bushing I got 20 degrees of vacuum advance. A bushing with a wall thickness of .06” reduced that to 12 deg. I 3D printed the bushing in nylon but you can make one by hand, maybe even from a piece of small poly tubing.
If you bench test with a protractor and vacuum pump, remember that distributor rotation x2 = the effective timing advance. In other words, rotating the distributor plate 6 deg advances the ignition timing 12 deg. Also, you need a bit of side to side play of the bushing in the slot because the rod moves is an arc to follow the distributor plate. The arc is very minor because it’s only moving about 6 degrees, but if it’s too tight it can bind.
i just installed the B26 (NAPA VC-1765) on my L36 and my bushing was also toast. Without the bushing I got 20 degrees of vacuum advance. A bushing with a wall thickness of .06” reduced that to 12 deg. I 3D printed the bushing in nylon but you can make one by hand, maybe even from a piece of small poly tubing.
If you bench test with a protractor and vacuum pump, remember that distributor rotation x2 = the effective timing advance. In other words, rotating the distributor plate 6 deg advances the ignition timing 12 deg. Also, you need a bit of side to side play of the bushing in the slot because the rod moves is an arc to follow the distributor plate. The arc is very minor because it’s only moving about 6 degrees, but if it’s too tight it can bind.
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