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#4 | |
VIP Member
Join Date: Feb 2003
Location: Glendale, Arizona
Posts: 3,041
Likes: 712
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![]() Quote:
It appears that some engine builders may have some close friends in piston companies because I have taken apart engines that although they have the approved part number stamped,they do not meet the approved spec sheet. I have found the following discrepancies in some of the Stock Eliminator engines I have torn apart: - Ring grooves that are thinner than spec. - Shorter distance from top of piston to top ring land that shown in spec. - Deeper valve reliefs than spec. - Smaller domes than spec. - Smaller dish volumes than spec. During a teardown, does NHRA assume the piston was built and approved in that configuration or the engine owner blames the piston company? I assume since there are less intrusive teardowns and less piston removals, that many are taking the risk by doing so. |
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