Re: Red Hot Manifold
- Anyone remember seeing the old, radial engine aircraft pass overhead at
night? You could see the exhaust flame for miles. In the distance, the
brightest thing seen was the 4 blue lights of the exhaust. They were
brighter than the required white tail light, which is a standard 26 watts
(about half of an automotive headlight).
Sure, this was before strobes & anti-collision lighting were added to
aircraft, but the exhaust was bright.
You could set the engine mixture by watching the color of the flame, on
smaller engines. The big guys had more instrumentation to go by.
So it is not unusual for any hard working engine to have a red hot exhaust.
You just don't normally see it.
When I was much younger I rode to a jobsite at night in the crane operators
seat. The actual operator was up front, driving the unit. And this guy
could actually make use of the intermediate gearbox & 2 speed rear axles.
You could see him using both arms to push, pull & prod that large
International gasoline six cylinder's transmissions. He kept the engine
rpms up in the power band, and we accelerated much better than the other
fellers were able to make that old beast go.
After about 5 minutes of stopping at stop signs & rowing through all the
gears, I noticed a red glow in the engine compartment (which had only
expanded metal venting on the rear). Called the operator on the radio &
told him we had a fire in the engine compartment. He stopped to check it
out, but we found no problem. Back on the road, it glowed again & I began
to see the form of the manifold. By the end of a 30 minute trip, it was up
to a bright orange color. It was bright enough to cast shadows on the
crane deck, when we finally stopped.
I don't mind replacing spark plug wires when they look old & worn. They
have to go through a lot in their heated workplace.