[Healeys] HS4 carb jet head and spitting

Oudesluys coudesluijs at chello.nl
Fri Jun 7 03:13:32 MDT 2013


Before setting the mixture, set your float level, valve clearances, ign. 
timing, spark plugs (renew?) and balance the carbs first. Failing to do 
so makes setting the mixture a waste of time.
Kees Oudesluijs
NL




Op 7-6-2013 8:15, Austin Healey schreef:
> 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 at 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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-- 
Kees Oudesluijs
Dorpsstraat 183
2995XG Heerjansdam
T: 078-677 1233
E: coudesluijs at chello.nl

Technische commissie Jensen Healey en GT
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