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MG Midget and Sprite Technical - Float Chamber surge? Is there a cure?

MkIV Sprite with 1 1/4" HS2 SUs and standard air filters.

I get an occasional slight loss of power for a few seconds typically after exiting a roundabout after doing a quick 180 degrees to head back up the bypass (or Museum at Loton Park)and accelerating hard.

Full power on all cylinders comes back after a few seconds of hesitant running, ie when fully back on the straight and level.

Could this be fuel surge in the float chambers? Is one chamber more susceptible than the other?

If it is, are there any known cures short of changing carbs?

Could it be something else?

It definitely isn't down to surging in the fuel tank as it happened today 2 miles after brimming the tank! After previous fuel pump air locks I know not to go hard round roundabouts on less than half a tank!

Any thoughts, comments or suggestions welcomed.

Colin
Colin Mee

Colin
Oil surge in the coil?
Problem started on LH turns and after time extended to going up hills. Really obscure fault if nothing comes to light. The oil surge causing some internal electrical misfunction and caused me, in correctly, to suspect fuelling.
Alan
Alan Anstead

Hi Colin.

In my experience this can be one of a few things.

Float levels.
Dodgy or sticking float valves.
Low fuel pressure / rate of flow, - i.e fuel pump not keeping up with demand.

or, and this happened to me at Mallory Park, one of the float chambers falling off and hanging by the feed pipe. The bolt came almost all the way out - the car was great around right hand bends but misfired badly around left hand bends.

Partly broken wire to fuel pump moving around under cornering causing the pump to cut off intermittently.(also had that one !)

Mark.





Mark Lister

This thread was discussed between 13/04/2014 and 14/04/2014

MG Midget and Sprite Technical index

This thread is from the archive. The Live MG Midget and Sprite Technical BBS is active now.