Mitty wrote:



On 9/14/2005 2:15 PM, xyzzy wrote the following:
snip


Bottom line, Pipers need carb heat a lot less than Cessnas because of
a different air induction system design.

Cessna 172's need carb heat pretty much all the time below a certain
RPM (it was 1800 in the last one I flew) because they don't route
their induction air as close to the manifold so it doesn't get heated
as well.

On the runup with a Piper when you check carb heat you get a lot
smaller RPM drop than a Cessna does. This is because the Piper's air
is already pretty warm.

I think you've just described the difference between Continental and
Lycoming engines, no? This is a Cessna with a Lycoming, where a single
casting functions both as the intake manifold and the oil sump.

No I haven't. The Cessna I flew (a 1975 M) had a Lyc, and so does the
Piper Warrior I fly now.

Cessnas need more carb heat for the same engine. Not all of the
induction system is designed by the engine manufacturer.

--
"You can support the troops but not the president"
--Representative Tom Delay (R-TX), during the Kosovo war.