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Intake plenum



 
 
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  #11  
Old April 11th 10, 02:26 AM posted to rec.aviation.homebuilt
Ron Wanttaja[_2_]
external usenet poster
 
Posts: 108
Default Intake plenum

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

  #12  
Old April 11th 10, 03:40 PM posted to rec.aviation.homebuilt
et
external usenet poster
 
Posts: 29
Default Intake plenum

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
  #13  
Old April 12th 10, 05:21 PM posted to rec.aviation.homebuilt
Neal Fulco
external usenet poster
 
Posts: 8
Default Intake plenum

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
  #14  
Old April 12th 10, 07:59 PM posted to rec.aviation.homebuilt
et
external usenet poster
 
Posts: 29
Default Intake plenum

On Apr 12, 9:21*am, 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- Hide quoted text -

- Show quoted text -


Neal

If you have room, you might consider a heat shield attached to the
exhaust pipe. I ran the exhaust out the side with the coolant air,
so my lower cowl is relatively cool. No exhaust pipes to heat things
up.

Ed
  #15  
Old April 17th 10, 06:59 AM posted to rec.aviation.homebuilt
Ernest Christley
external usenet poster
 
Posts: 199
Default Intake plenum

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.
 




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