Neal Fulco wrote:
On Apr 11, 9:40 am, et wrote:
On Apr 10, 6:26 pm, Ron Wanttaja wrote:

Peter Dohm wrote:
"cavelamb" ""cavelamb\"@ X earthlink.net" wrote in message
Come on, guys!
How hot do you think the intake air can be and still have the motor run???
I was really wondering about that as well--and also doubting the required
strength...
The air doesn't stick around long enough to GET hot...it's moving past
in a hurry. However, the plenum is in direct mechanical contact with
the hot parts of the engine. The airflow will help cool it, but
there're still parts in direct contact.
Ron Wanttaja
We're not talking about a composite heat muff? Are we? Surely,
we're talking about the part that directs air into the carb?

Ed

Right, we're talking about the plenum itself, not the muff. The only
part that will contact anything on the engine will be the flange that
attaches to the carb. It will be a few inches away from the exhaust
manifold so that is a concern also. I even thought of making the
basic structure out of thin aluminum, wrapping that with fiberfrax,
(the thin stuff you usually sandwich between the stainless and plywood
on a composite construction) and then glassing over that. Sounds
labor intensive, but seeing the work needed for fitting, riveting, etc
that is needed for an all aluminum structure, it's really not that
more involved.

Neal

The most severe temperature will be right after shutdown, when the
engine is still hot but there is no longer any cooling air flowing.