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Stroke = Distance between BDC and TDC, when you put in longer rods, you move BDC AND TDC tword the head, therefore gaining no lengh in your stroke, but increasing your compression ratio since the entire assembly moved toward the surface of the head. Am I right on this ? im not quite that good with engines LOL. but good topic
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Your totally correct...it won't give you anymore stroke. And could possibly give you extra compression, but you usually use different pistons which will soak up the added rod length. The pistons will give you desired compression.
I tell ya...it's a good topic because it makes you think a little differently.
I know some of this stuff in theory, but until I drew it out in those 2 illustrations I really didn't 'see' it quite as clearly.
This is old, old stuff developed by the super stock guys. They were measure by cubic inch, and they all had to account for the same total displacment...how they made power rested in the combinations they used