Posted by JMOR on May 21, 2009 at 20:14:46 from (72.181.158.237):
In Reply to: Glowing exaust posted by MJ in the UK on May 18, 2009 at 16:48:48:
scotc said: (quoted from post at 22:54:21 05/21/09) We had a 1066 that was putting out about 300 horse with roughly a stock fuel setting, the block was decked, and we were told the turbo had the wheels in it for a 466. She sucked back less fuel than our stock 1066, and would slip the PTO clutches before it would slip the slip clutches in the 881 CIH chopper we ran with it. And it never pushed flame out the stack.
My uncle fiddled with some of the settings (high idle maybe) on the pump on the 756. It would push flame at night but the manifold and stack never glowed.
On our 1566 we put the fuel to it til it ran the Gehl 1275 (?) chopper better than the 3788 did the day we blew apart its pressure plate. It would blow a column of black smoke about 40 feet in the air, about a foot and a half diameter, chopping on a cool still night. It never pushed flame and the manifold/stack never glowed on it. That should have had a set of 466 heads on top of a 466 turbo, it is a wonder we didn't melt it down with all that fuel and not pushing any more air in with it.
More airflow, even without increased manifold pressure, or increased manifold pressure with the same airflow, makes for lower EGT. And more pressure with more airflow is even better.
Unburned, vaporizing fuel is a 'coolant'. If you want 'hot', run the sucker lean.
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