They should be more or les the same height. Have You checked the needles?
Are they the same for sure? Are they not worn? Float level has instant
effect on the jet heigth. Compare the floats.The slightest air leak at a
carb can cause different jet settings. Although completely lever setting is
also not realistic with theese engines.
Backfiring is an issue this case caused by overly lean mixture. The choke
is there to adjust the mixture while cold. When hot it should not happen at
any circumstance.
Gergo
2013/6/7 john spaur <jmsdarch@sbcglobal.net>
> I have questions concerning a BT7 tricarb.
>
> While tuning the car, it was noticed the two rear jet heads were at about
> the same level but the front jet head was considerably higher (all were
> below the bottom of the Venturi). It is my understanding the height of the
> seat is related to float height setting and lean/rich jet adjustment.
>
> Should I recheck the float levels to see if something is amiss and adjust
> so the jet bearing seats are more uniform before I tune the carbs?
>
> The carbs sometimes spit petrol, while cold (common issue I believe) and
> upon acceleration when the engine is hot. Is this an issue related to valve
> timing and/or rocker clearance? I think spitting back fuel can be caused by
> a too lean condition.
>
> Could the valves be staying open too long? I have a Denis Welch road cam
> which is similar to a BJ8. Per DW, the rocker clearance is set to .015 cold.
>
> Needing clues to fine tune the healey.
>
> TIA
> John Spaur
> San Jose
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