Outer Limits 4x4 Board

Hi guys,

My Aussie spec HJ75 just about shit itself trying to climb up to 2400 m altitude. It has a naturally aspirated 2H with good compression on all cylinders and just rebuilt injectors. The fuel pump has never been rebuilt but the odometer says it has 160,000 kms. There is probability the engine has been rebuilt as the head seems to be an Aussie casting (it has a kangaroo cast into the head, LOL). The timing is at 11 degrees BTDC like a non AC engine although it has an AC (which calls for 18 degrees BTDC). There are some long steep sections where I was crawling at 20 km/h in 1st gear.

My question is, is this all I can expect from the motor? I don't think it has a High Altitude Compensator. None of your 2H LandCruisers have one, right? It leaves a big black cloud behind me on the climbs but not on the flats.

How do your NA 2H powered cruisers do at altitude? What are the altitudes you guys typically see down under?

Dave

Dave,
You're right, our engines don't come with altitude compesators. Typically out paved roads dont go much higher than 1200-1300m. with some very minor exceptions to the ski areas. They tend to suffer a bit even at these altitudes, but the major percentage of roads are well below that height. Not much you can do to overcome the problem really, except for a compensator or forced induction. You can try backing off the accelerator a bit on hills, and you'll find that you actually get more power as the air/fuel ratio is corrected. This is typical for driving at any altitude with the 2H, took me years to discover that. I found (through supercharging) that the fuel advance on the 2H is very sensitive to vacuum advance, and you will even get better acceleration by gradual right foot, rather than full stomp.

Where exactly on the other side of the pond are you ?

Thanks. It was hard to fight off the natural tendency to press on the accelerator when I needed more speed. The only one I passed on the way up was a bicyclist at 2200 m, I got passed even by a Dodge minivan (like your Chrysler Voyager) pulling a trailer

I'm in the US. The troopie has strayed a long way from home, LOL.

Dave

i remember a guy (*in the US) who discovered this exact same thing


he put a turbo on and it fixed it no worries.