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#21 |
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Location: Central Ohio
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Hmmmm . . . I would next accurately measure the crankshaft stroke.
Something seems weird in that you're running a very "normal" setup --> with a 4.00" Merc crank. I would also measure exactly how high the top of the dome of the piston is above the deck. The heads look about "normal" in the dome areas. Would also like to know the depth of the dome/pocket in the center of the head. Measure a piston on both sides of the block. Once we know the stroke and the height of the piston dome, then we can figure out what to do next. If the piston locations (to the deck) are consistent on both sides, then maybe the pistons are for a 4 1/8" stroke compression height. This would result in the piston being .0625 further down than it should be. If the piston was .0625 higher, then things would be a lot closer to how they should be (squish). The piston definitely should not be "down in the hole" as it is. Also, while the engine will run - I would surely want the piston/squish situation to be "fixed" if it was mine. ![]() Companies make mistakes - maybe the pistons were manufactured or boxed incorrectly? |
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#22 | |
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#23 |
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Yeah Tim - that is my guess as well.
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#24 |
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More of John's pics that he sent this morning. Coop |
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#25 |
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That piston position looks fine to me. Something is amiss here. Are you sure you measured correctly?
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#26 |
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#27 |
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Piston looks fine no issues there from the picture. Would be nice to see the thickness of the putty when its cut in the center and then measured with the vernier. The Orosco heads may be domed at a radius different than the Ross pistons. Older cast pistons such as Jahns as an example were definitely a different dome radius than today forgings.
Ronnieroadster
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I use the F word a lot no not that word these words Flathead , Focus and Finish. "Life Member of the Bonneville 200 MPH Club using a Ford Flathead block" Owner , Builder, Driver of the First Ford Flathead bodied roadster to run 200 MPH Record July 13, 2018 LTA timing association 200.921 in one and a half miles burning gasoline. First ever gas burning Ford flathead powered roadster to run 200 MPH at Bonneville Salt Flats setting the record August 7th 2021 at 205.744 MPH |
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#28 | |
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#29 |
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#30 | |
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Your right Tim its certainly a factory relieved block.
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I use the F word a lot no not that word these words Flathead , Focus and Finish. "Life Member of the Bonneville 200 MPH Club using a Ford Flathead block" Owner , Builder, Driver of the First Ford Flathead bodied roadster to run 200 MPH Record July 13, 2018 LTA timing association 200.921 in one and a half miles burning gasoline. First ever gas burning Ford flathead powered roadster to run 200 MPH at Bonneville Salt Flats setting the record August 7th 2021 at 205.744 MPH |
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