Thread: Wading.

Originally Posted by Dougal

We all know that landrover recommends a max wading depth of around half a metre.
But Isuzu in their 85 NPR handbook recommend a max wading depth of 1 metre.
With recommendations to close the foot air vents first.

Back in the late 80's it was common practice to wade the old isuzu stage 1 in 1 meter or more of water with out any problems

gotta remember, the only thing the NPR and a stage 1 have in common is the isuzu engine...... air intake height is a major factor in wading, as is the exhaust height

Originally Posted by Sprint

gotta remember, the only thing the NPR and a stage 1 have in common is the isuzu engine...... air intake height is a major factor in wading, as is the exhaust height

Air intake certainly, the NPR's had their factory intake right up the back of the cab. But I don't see the exhaust causing many problems. Some extra backpressure from being underwater but that's about it.

Yep well the stage 1 never had a snorkel and the intake was directly behind the rocker cover and never had an issue the trick to deep water is constant speed to create the bow wave

Originally Posted by Dougal

Air intake certainly, the NPR's had their factory intake right up the back of the cab. But I don't see the exhaust causing many problems. Some extra backpressure from being underwater but that's about it.

ever heard the saying "if you dont ****, you die"?

same principal with an engine, backpressure is a good thinkg to a point, but too much has the same effect as holding your hand over the intake so no air can get in

Exhaust isn't a problem unless you stall with it underwater

I have frequently driven my 110 well over the recommended depth, occasionally to the level of the top of the guards for very short distances, with no ill effects. Make sure you have the wading plug in though. The air intake is in front of the vent on top of the guard, so even a bit of water coming through there does not go into it, and the water coming in the front through the radiator will take a while to rise to the same level as outside, particularly if you maintain a bow wave as suggested.

John

Originally Posted by Sprint

ever heard the saying "if you dont ****, you die"?

same principal with an engine, backpressure is a good thinkg to a point, but too much has the same effect as holding your hand over the intake so no air can get in

The Isuzu engines are made to take either an exhaust brake, a turbo or both. They run fine with exhaust backpressures above 30psi.

You need to be 20m underwater to get 30psi pressure.