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OK Tech-Geek Gear Heads, This One's For You: The Old 'Visible-V8' Engine @ 7000 RPM

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Image uploaded from a quicklink Originally designed to run at 100 rpm, goes over 7000 rpm (with blast shield in place, of course!). This Visible V8 is tested over 7000 RPM for the first time. This is a new block. The cylinder heads are the same from the Visible V8 @ 5000 RPM 1-4 videos, with a new valve train geometry to correct a valve float problem above 5300 RPM.
The rods, pistons and crankshaft are from the Visible V8 @ 5000 RPM 1-4 videos.

In this test, the generator bracket came loose about 6000 RPM. The Crankshaft sheared off at the 3 and 4 rod journal. The 1 and 2 rod journal bent about 20 Degrees. Everything else is ok.
This modified stock crankshaft had 15+ hours of running time before crankshaft failure @ 7151 RPM.
The new electric drive motor is a Dayton 2M145 115 Volt 1/2 HP AC DC controlled with a Variac speed controller...

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