Heat range should have zero effect on cold starts, idle speed and low load conditions. The heat range is determined by how long it takes a spark plug to transfer heat to the cylinder head. There is not a universal measurement, heat range from one manufacturer can be totally different from another.
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Today's Featured Article - The Collection of a Lifetime - by Sherry Schaefer. The larest gathering of orphan tractors ever assembled by one collector will be auctioned off on May 15 in Rock Island, IL. Ed Spiess was a well known tractor buff who spent most of his time dreaming of rare and unknown tractors. His background as an agricultural engineer sparked his interest in the unique attributes of the models built from 1939-1959.
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