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11-26-2019, 02:26 PM | #1 |
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Flathead domed pistons and 21A rods
I found this on EBAY, and was wondering, can a flathead V8 actually used pistons with that big of a dome ?
Sal https://www.ebay.com/itm/Ford-Flathe...UAAOSwfVtd2Bkm |
11-26-2019, 02:35 PM | #2 |
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Re: Flathead domed pistons and 21A rods
Others would know for sure, Ronnie Roadster, etc., but they look like Ardun pistons to me. Take a look at the notches for hemi-type valves.
Last edited by Tim Ayers; 11-26-2019 at 02:40 PM. |
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11-26-2019, 10:15 PM | #3 |
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Re: Flathead domed pistons and 21A rods
Tim, thank you. That would explain it. I forgot about the Ardun OHV heads. That would explain the high price too.
Sal |
11-30-2019, 02:20 PM | #4 |
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Re: Flathead domed pistons and 21A rods
Yes they are for the ARDUN heads. The price for a set of Ross ARDUN pistons is usually about $80.00 per piston including the pin and rings. The stock Ford flathead rods included in the deal would be the weak link with the compression those domes will end up giving in the combination. However im sure economy can be gained using them.
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 Last edited by Ronnieroadster; 11-30-2019 at 05:27 PM. |
11-30-2019, 03:34 PM | #5 |
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Re: Flathead domed pistons and 21A rods
Compression, is on part of the internal combustion cycle that add torque to the crankshaft. Compression and displacement is the key to a great street engine. When the L-100 can became the go to cam for a street engine. It did so at the cost of low speed torque. So I and others, added displacement to the brew anr revived most of the low speed torque. After 2500 rpm the cam improves the torque curve with better breathing. But it was the sound that sold it. So when building an engine for the street, compression is your best friend.
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12-01-2019, 08:33 AM | #6 |
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Re: Flathead domed pistons and 21A rods
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As OlRon says, the best first step for improving your Flathead is to bump up the compression ratio. Adding compression or displacement are the only methods for improving power and efficiency at nearly all RPM levels. |
12-01-2019, 03:27 PM | #7 | |
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Re: Flathead domed pistons and 21A rods
Quote:
__________________
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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