Genuine question: what actually happens if you do this? Does the
water flood the electrics and bring the engine to a stop, or does it
enter the exhaust pipe, or does it lift the wheels off the road?
I was taught to slip the clutch, rev the engine, never take your foot
off the accelerator and proceed very slowly to avoid creating a bow
wave. I was also taught the water has to be fairly shallow (but I
cannot remember any figure).
A lot depends on the vehicle but most modern cars have their air intakes
low down (for cooler air maybe?) which means they’re very prone to ingest
water in even quite shallow floods. No amount of engine revving will stop
Regarding bow waves, lots of contradictory advice around. I think a bow
wave per se isn’t necessarily a bad thing as long as you don’t try to
overtake it and have the water rise over the bonnet. You do need to be
confident that your air intake is situated high up rather than low down.
Thanks. This is good advice. I think I was getting confused in
thinking the exhaust pipe was the biggest problem when of course, as
you say, the air intake is likely to be be more crucial. I will look
tomorrow. My car is quite old (2008 Micra) so this may be a benefit?
In that example I suspect the air intake got flooded, the engine
ingested water and hydrolocked. Twonk, if hadn't gone in so hard and
fast he'd have got through.
Modern electrics and connections are an awful lot better than they
were, condensation in/on the distrubter cap was enough to stop a car
in the old days...
Unlikely with the exhaust gases being pushed out by the exhaust
stroke of the engine.
As in float, yes that can happen but how much depth is required
depends on the vehical. A Land Rover Discovery has a wading depth of
70 cm (27") a mini about 25 cm (10"), note these are the depths to
which the car should survive if driven sensibly, floating depth will
Deep water is remarkably reluctant to get out of the way. I managed
to get a Mondeo through a flood that was "a little deeper than I
expected". Took an awful lot of go pedal and slipping of clutch just
to maintain a slow walking pace, the water was just lapping up onto
the bonnet. Starter motor was never quite the same afterwards but
nothing else complained.
There also the problem of aqua-planning, where the tyres grip is lost
completely. The tyre is lifted off the surface completely, when the
tyres bow wave is simply unable to escape. More likely the poorer the
tread depth. You loose all braking and steering capability, as if on
ice. The car in the video, shows some slight evidence aqua-planning.
HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here.
All logos and trade names are the property of their respective owners.