Ring gap for H435P hypereutectic pistons - Hot Rod Forum : Hotrodders Bulletin Board
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Old 06-26-2012, 05:37 PM
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Ring gap for H435P hypereutectic pistons

Do I need to file the ring on these pistons?

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Old 06-26-2012, 08:27 PM
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Quote:
Originally Posted by Carli66
Do I need to file the ring on these pistons?
You will need to check the rings and file per the piston manufacturer recommendations for the gap. The hypers usually have a wider top ring gap than the second ring but you need to follow the piston makers directions.
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Old 06-26-2012, 10:23 PM
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Some piston rings come pre-gapped and some are file to fit .

Pre-gapped rings...just doesn't seem right to me. I figure a good machine shop will measure the pistons, then bore and hone the block to fit the piston size and wall clearance. Then file the piston rings gaps to get correct gap size. So it seems like a false economy to get pre-gapped rings. Maybe I am paranoid.
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Old 06-27-2012, 07:15 AM
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The Sealed Power/Speed Pro hyper-eutectic pistons do not have the "heat sink" problem the KBs have. The top ring is "gapped" as any other "standard" approach.

The Kieth Black castings are the only ones requiring the added gap. The Icon forgings (also from Unitied, the makers of KB) do NOT have the problem, either. Thus the name "change", to separate them from the problematic KBs.

FWIW

Jim
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Old 06-27-2012, 01:08 PM
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I guess we all should have asked before spouting off, is this a naturally aspirated, blower, nitrous? If you plan on any power adders, use forged pistons.
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Old 07-01-2012, 11:54 PM
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The higher the expected engine horsepower and heat load, the bigger the piston ring end gap needs to be.

If you will be running your motor hard with lots of WOT running and or a power adder(especially with any chance of detonation) , open up the ring gap.
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Old 07-03-2012, 11:29 AM
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I thought KB hypers required a larger gap due to the compression ring being closer to the deck. When the ring is moved closer it gets hotter and thus requires more gap.
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Old 07-03-2012, 11:45 AM
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Correct. Kieth Black (United Engine Parts) pistons DO require "special" top ring gaps. The pistons in this thread are NOT KBs. They are Speed Pros. No "special" requirements.

Jim
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