Recent content by charlieaarons

Please be specific about which transmission. Is it a ZF S5-420 which was standard for F250/350? If so, which ratio set (1st gear ratio)? Or a Borg Warner? Snd what’s the diff ratio? Any traction adding diffs?

Another view of the 2.8L for 79 series

In fact, if it’s a new 79 chassis, it might even have that 4 cyl intercooled turbo diesel that has same hp & torque as the stock version 4.5L V8 diesel. I posted pictures I took of a demo in Namibia last (our) summer.

This simply reiterates Peter’s post, you see the pressure-speed relationship in print, endorsed by MB engineers. Last year I drove a 12.3 metric ton vehicle on deep sand tracks in January (summer), 5 days, maybe 200km in Central Kalahari Game Reserve. With my tires at about 45% usual highway...

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There’s a Michelin 275/80R20 MPT that’s only 37” tall (305/70R19.5 is ~36.3”) and the new X Force ZL version has load index 137 = 4660kg/axle, 10141 lb/axle.

Founders Tire has impressive offerings. A mud terrain 305/70R19.5, and the aluminum wheels aren’t just any alloy wheels but Hutchinson 2 piece bolt-togethers! Which means you can have an internal beadlock which greatly increases ability to operate (slowly) offroad at decreased pressure without...

What I really really don’t understand is why EVs don’t have a solar panel roof. If it’s 1.6x1.6m =2.56 m, current technology will yield on sunny days in Sunbelt latitudes ~ 2.4kwh/day. My daughter’s ID.4 has an 80kwh battery pack, so 3% of that is what, maybe 7.5 miles/day? Most people with EVs...

I agree 100% with dynamic vs static comments (dynamic = “inertia”). Which is one reason why I have seemed to be obsessed over the years on this forum with low gearing = ability to creep without lurching. Anyone who’s driven an automatic over rough terrain and relied on the torque converter for...

Calculate the height of the COG using the weight per axle on inclined plane of known angle, and use simple trigonometry for tipover angle when height of COG is directly over tire tread center. With fudge factor for suspension deflection. I used alternative summation method (ΣW(i) x h(i)/W). Sum...

Also recommend: adjustment of road (high speed highway) pressure in linear proportion to load which should be measured accurately and/or increased by 10% over calculated value ESPECIALLY if ANY GUESSWORK is involved, for safety. The %s in above chart applicable for 445/65R22.5 should be adjusted...

Note recommendation in Unimog manual for deflation/speed recommendations for 445/65R22.5. Note, above in the thread by Peter/Margaret, the completely (mathematically ) linear nature of relation of load & inflation. There’s no such data that I’m aware of for 22.5 tires with numerically higher...

I do follow your reasoning, for sure. However, do you actually have experience operating a ~25k lb truck, with a relatively low torque to weight ratio, in rough terrain loaded with innumerable fragile items? And it’s always that “last 100 yards” in getting off a dirt road around the bend of a...

Many non USA mfgs of both diesel cars and trucks make 2 engine versions: latest emission controlled (Euro 6/VI), and latest version not needing any sulfur restriction (3/III). The latter can use high SAPS lube oils to neutralize H2SO4.