Don't know much about the 6.2 non turbo, but in the turbo Cummins / Duramax world, 1350 pre turbo EGT is the magic number you don't want to go over. Why are you guys saying 1000 is the limit on the 6.2? Are the pistons that much weaker that they won't handle the heat?
Well if there is no turbo to fry ,what are acceptable egt levels, i would think that in the exhaust manifold 1250 would be acceptable.
Your not going to have your foot to the floor nonstop, and if you arent trailering a heavy trailer, i dont see where you should be having a problem.
The 6.2 and the Cummins are 2 totally different animals. The biggest diifference is that the 6.2's compression ratio is 21.5 : 1 and the Cummins is 17.5 : 1 - 18 : 1, but the 6.2 is also an indirect injection design (vs direct on the Cummins) and the 6.2 has uncoated, cast pistons vs forged in the Cummins (and other HD diesels, The IDI design creates more heat, and if the you keep EGT's much over 1000 degrees, you simply cannot control the water temperature. This is the reason marine 6.2's and 6.5's can be turned much more than auto apllications. The 6.2 has a bigger radiator than the Cummins/D-Max/Powerstroke and still struggles to keep the engine cool, even in stock form, under heavy loads. The 6.2 in stock form in capable of around 200 - 210HP and 400 - 420 ft lb TQ which is very adequate. You can push a little more, but that's about the "safe" limit. Even at the "safe" limit, you can grenade one by beating on it. ****, you can grenade a stock one fairly easy by beating on it.
The 6.2 was designed as light duty diesel, with fuel economy in mind. Detroit's original design featured a beefier block, forged crank and pistons, and would have actually been a pretty good foundation for a lot more power. However, when bean counters at GM got through wittling down the costs, the result is what we have. In fact, the 1982 "red" block has a higher nickel content, and are stronger and MUCH less prone to cracking than anything '83 - up.
The newest version of the 6.5 being produced now by AMG is really how the 6.2 should have been built all along. Its all forged, has a much beefier block, has an integral stud girdle, and is rated at 250HP and 550 ft lb TQ. I'd love to buy of them for my M1009, drop the CR to 19 : 1 and install a Holset HX35 or ATT turbo, and a 4911 pump. You can achieve a RELIABLE 300+ HP - 600+TQ out of those.
