Floods and electric cars

[Dorchester2]

Originally Posted by gnu

With a ZT/ 75 one would need to check the Shannon tube is sealing well (when I bought mine, the intake tube resembled a slinky!). Replacing it was one of the first jobs I did.

Good move. I did the same with a compatible modern plastic tube.
I assume it's watertight.

[bl52krz]

The really sensible thing to do is................find another way round.

[Mogodon]

I've seen at least 2 in the Rufford videos successfully getting through quite deep water by doing it in reverse !!!!!

[torque2me]

Originally Posted by Mogodon

I've seen at least 2 in the Rufford videos successfully getting through quite deep water by doing it in reverse !!!!!

It's an idea but most exhaust outlets will be too low?
Kev

[SteveThackery]

Originally Posted by torque2me

It's an idea but most exhaust outlets will be too low?
Kev

True, but water won't enter very far when there's exhaust gas gushing out, will it? And even if it did, it would just drain and evaporate out, I reckon.

[torque2me]

Originally Posted by SteveThackery

True, but water won't enter very far when there's exhaust gas gushing out, will it? And even if it did, it would just drain and evaporate out, I reckon.

I would try that theory out first Steve. Any water preventing the combustion gases for more than a few seconds will produce massive back pressure which could even have the possibility of blowing heads of. That is why vehicles that wade (such as Land Rover types) have vertical exhaust outlets (roof level or above).

The "reversing" cars could have been EV's but why then reverse? Another conundrum of life :sigh:
Kev

[SteveThackery]

Originally Posted by torque2me

I would try that theory out first Steve. Any water preventing the combustion gases for more than a few seconds will produce massive back pressure which could even have the possibility of blowing heads of. That is why vehicles that wade (such as Land Rover types) have vertical exhaust outlets (roof level or above).

I'll take your word for it, but I still don't get it.

The idea that exhaust back pressure could blow the heads off seems unbelievable - surely the exhaust piping would burst well before that. And even if you block the exhaust completely (by some imaginary means), the pressure built up cannot exceed the combustion pressure, and the head bolts contain that much pressure hundreds of times a minute without the heads blowing off.

The only mechanism I can imagine is if one cylinder suddenly hydraulic locked whilst the engine is running fast enough for the flywheel inertia to inflict damage, although I think a bent conrod would be more likely than a detached head.

It's hard to visualise how significant amounts of water can get into the exhaust while it is blowing gas out.

All very puzzling. I expect the Land Rover exhaust is so positioned to prevent water ingress if it should stall. That could be very damaging.

[torque2me]

Originally Posted by SteveThackery

I'll take your word for it, but I still don't get it.

The idea that exhaust back pressure could blow the heads off seems unbelievable - surely the exhaust piping would burst well before that. And even if you block the exhaust completely (by some imaginary means), the pressure built up cannot exceed the combustion pressure, and the head bolts contain that much pressure hundreds of times a minute without the heads blowing off.

The only mechanism I can imagine is if one cylinder suddenly hydraulic locked whilst the engine is running fast enough for the flywheel inertia to inflict damage, although I think a bent conrod would be more likely than a detached head.

It's hard to visualise how significant amounts of water can get into the exhaust while it is blowing gas out.

All very puzzling. I expect the Land Rover exhaust is so positioned to prevent water ingress if it should stall. That could be very damaging.

Have a go Steve. This is how inventors and such checked out their theorems. Put a potatoe up the exhaust, start the engine and rev it. It won't rev much, maybe a couple seconds, before it conks out. The back pressure has been known to create damage (manifolds, carbs, heads) but that is usually in a small % of cases. Usually engine conks out immediately. This is a trick they use in the 'removal of Stag heads' syndrome.

Let us know how it goes ;-)

Kev