Flathead jetting
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  1. #1
    I'm a grown up member now ! Rog M's Avatar
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    Flathead jetting

    Hi all,took my Fordson out for it's first run today - big disappointment.Started OK but ran rougher the further I went .I took a couple of
    plugs out and they were very sooty so I am thinking too rich.Just wondering what jets everyone else is using/recommending
    with a twin '97 stromberg set up on an otherwise standard engine. Thanks.

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    Official RnS Addict Gavin's Avatar
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    Stock Strombergs should run .45 main jets and .65 power valves. These are usually a good starting point but check to see what you have in there if they aren't new ones. It's a case of trial and error as you step down on the sizes to find a sweet spot. I run twin Strombergs with .43 mains and .67 PV. This is on a warmed over 21 stud 221ci and gives a nice plug colour.

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    I'm a grown up member now ! Rog M's Avatar
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    Hi Gavin,thanks for that.Just wondering if you use H10C plugs ?

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    Official RnS Addict Gavin's Avatar
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    I don't mate due to my Eddie Meyer heads needing longer a reach. I use NGK 6BPHS. Plenty of people use the H10's without issues.

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    I'm a grown up member now ! Rog M's Avatar
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    Hi,just a quick update if anyone is interested.After all day messing about - as you do - it was a faulty condenser causing the problem.
    Last thing I checked of course.
    Don't know why people say Flatheads are slow - seems quick enough to me.
    I have had a 30 HP prefect as a daily for two years though.

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