Intake manifold temperature creeping higher
I have been noticing that my manifold temperature has been creeping higher on my ISL 370 w/80K miles. It used to be 10-14 degrees F higher than ambient temperature. But now I'm seeing (via Silverleaf)...
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Good point, Don. A sticking exhaust brake would sure drive up both intake and exhaust temperatures.
And, with Larry's engine (Cummins ISL), it could come with either an exhaust brake or engine compression brake).
Rising intake temperatures with exhaust brake on (throttle closed) is actually a reasonable AND good thing. With closed throttle, exhaust brake on, less air is moving through the system, so air stays in the ducting in the engine room long enough to pick up ambient heat. And, since there is zero fuel injected with throttle closed, it is not a bad thing that engine temperature does not drop suddenly. No point in exaggerating the heat/cold cycles in the mountains.
And, with Larry's engine (Cummins ISL), it could come with either an exhaust brake or engine compression brake).
Rising intake temperatures with exhaust brake on (throttle closed) is actually a reasonable AND good thing. With closed throttle, exhaust brake on, less air is moving through the system, so air stays in the ducting in the engine room long enough to pick up ambient heat. And, since there is zero fuel injected with throttle closed, it is not a bad thing that engine temperature does not drop suddenly. No point in exaggerating the heat/cold cycles in the mountains.
