Home  Reviews Mega-Piston Review UPDATE: Prometheus Hard Piston
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Mega-Piston Review UPDATE: Prometheus Hard Piston |
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Written by Jay
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Sunday, 05 December 2004 |
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Page 2 of 4 Updated results for the prometheus hard piston The damage to the Prometheus Hard Piston was much more severe than any of the other pistons in the review, and did not seem to correlate to a weakness in the design of the piston itself. A possible source of the damage may have been the premature engagement of the sector gear first tooth and the piston second tooth. Several pistons in the review displayed slight interaction between the first sector gear tooth and the second piston tooth, but since none of the pistons were modified to correct for this shortcoming, the Prometheus piston was likewise left alone. Most of the pistons compensated "automatically" through slight deformation of the second tooth to allow the sector gear tooth to slide by, but the Prometheus piston may have been unable to do so due to its reinforced design. To verify these theories, a new piston was ordered for follow-up testing and the piston tooth engagement position photographed.
Piston Fitment
As can be seen in the piston fitment photos above, the second piston tooth is completely engaged by the sector gear, to a much more pronounced degree than the other pistons in the round up. This likely led to the piston "bottoming out" against the spring guide before the sector gear has gone through a full rotation, placing tremendous stress on the second piston tooth. Additionally, the torque generated by the Systema STU gearset in combination with a 9.6V battery was apparently enough to completely shear off the second and third teeth of the piston, causing severe alignment issues with the rest of the piston teeth and the resulting pattern of damage to the piston. It is obvious that the simplest remedy to this situation is to trim or remove the second piston tooth so as to preserve proper tooth engagement.
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