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andy1960

"Hunting" engine

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Hi ...not directly miliitary but looking to the groups expertise....can anyone remind me why a 4 stroke petrol engine would "hunt" ( rev up and die down of its own accord) when ticking over. Fuel problem ? Electrical/distributor ?Any suggestions welcomed.Thanks Andy

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Hi ...not directly miliitary but looking to the groups expertise....can anyone remind me why a 4 stroke petrol engine would "hunt" ( rev up and die down of its own accord) when ticking over. Fuel problem ? Electrical/distributor ?Any suggestions welcomed.Thanks Andy

 

It might help if we knew what the engine was. If it is fitted with a governor, this could be causing it. Could also be restricted fuel supply ............. Is it a lawn mower engine?

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It might help if we knew what the engine was. If it is fitted with a governor, this could be causing it. Could also be restricted fuel supply ............. Is it a lawn mower engine?

 

1948 Triumph Roadster..."Bergerac" triumph with dickie seat in the back !

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1948 Triumph Roadster..."Bergerac" triumph with dickie seat in the back !

 

:D OK, that rules out a governor issue. Could be restricted fuel supply, or pump cannot keep the carb full.

 

My old school headmaster back in '60's had one of those, before we knew them as Bergerac's car!

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The "hunting" problem might be caused by a worn throttle shaft bore in the carby . If that is the case, air will sucked in and this will effect the idle speed regulation . Hope this helps .

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It may be an idea to check vacuum pipwork to brake servo and servo. Check carb and inlet manifold gaskets for integrity and security.

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the esiest thing to do would be to have a fiddle with the volume control screw on the carb (not the stereo) might be a rich mixture making it hunt

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the esiest thing to do would be to have a fiddle with the volume control screw on the carb (not the stereo) might be a rich mixture making it hunt

 

Question is then why has the mixture changed? Might be worth considering a complete carb re build. The idle jet could be worn blocked, you haven't said where the engine is, and has it been sitting for a while, especially with old fuel in?

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1948 Triumph Roadster..."Bergerac" triumph with dickie seat in the back !

 

What type of carburettor(s) , if SU - could be a dashpot oil issue.

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What type of carburettor(s) , if SU - could be a dashpot oil issue.

 

According to my carb book it should be a Solex 35FAIE

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