engine cutout in Autotests

[agricola]

I have a recurring problem with the engine cutting out on my S in vigours movements in autotests, handbrake turns etc. I have cleaned tanks out (they were clean anyway replaced lines and fuel pumps and filters (large filter king) changed float chamber valves to vitron tipped ones. Even run it with both fuel pumps, still cuts out. Fuel pressure is at a constant 3 psi. Any thoughts? Using super unleaded.

[woodypup no 2]

Something moving and affecting an electrical connection. Broken core in a cable ?

[agricola]

I would like to think that but still there after rewire!! and different engine coil and distributor new from H&H! very frustrating

[GraemeC]

A ‘hard’ cut would (to me) indicate electrical/ignition, whereas a cough & splutter and unwillingness to rev first would indicate fuel.

[agricola]

my problem is when it happens I rather have my hands full so I am going to have to try and describe it better

[olddave]

Try yet another coil. I had the same trouble but just on l/h turns! Change of coil worked.

[Oneball]

Are you using the clutch? Too low an idle speed and it’s stalling as wheel speed becomes very low?

[agricola]

no its done it on both engines with rpm relatively high I am going to flow check the fuel in case the hard fuel line has gunge in it. I cut open the fuel tanks and they were spotless. Coil is new but is mounted up in the bonnet mounted on a head stud.

[Polarsilver]

There was a past Post on H4,s .. Mark sorted his problems by filling the Floats with foam.. I think ?

[agricola]

im on hs4s
but bullens do a stay up float anybody any experience

[timmy201]

Is it always turning a particular way or does it happen all the time?

Which way are the float bowl lids rotated? If the float is set sideways it might be shutting off during turns

[agricola]

I will look I thought it may be something to do with floats bit like the merlin engine in a spitfire well sort of.

[Exminiman]

Sounds as if the only remaining parts are the fuel line and ignition switch ?

Maybe bit of rubber from a hose flapping around inside fuel pipe or something shorting out ignition switch...bit tenuous I know

EDIT, another thought, it not the wrong angle inlet manifold is it ?

[agricola]

I will look at that all the ignition switch wiring to coil etc was changed and thinking about it it is worse anticlockwise left hand turns

[olddave]

I will look at that all the ignition switch wiring to coil etc was changed and thinking about it it is worse anticlockwise left hand turns

I put my problem down to lack of oil in the coil. Pointed it downwards as a temporary fix.

[mk1]

Check all your engine mounts & the main battery cable. I have seen this it was caused by the man battery cable shorting out on the exhaust.