VansAirForceForums  
Home > VansAirForceForums

-POSTING RULES
-Advertise in here!
- Today's Posts | Insert Pics

Keep VAF Going
Donate methods

Point your
camera app here
to donate fast.

  #1  
Old 02-14-2021, 05:53 PM
dan carley dan carley is offline
 
Join Date: Jan 2005
Posts: 659
Default James cowl

I have a James cowl on my Rv6 (I bought it this way)
But do not have the plenum installed. All the baffling is tight
But the 0-360 seems to be running hot. Would it help if I put the plenum
On?

Danny carley
Reply With Quote
  #2  
Old 02-15-2021, 05:36 AM
BillL BillL is offline
 
Join Date: Sep 2007
Location: Central IL
Posts: 5,832
Default

Maybe, but there are a lot of possible leak sources that could help with what you have. Post some pictures and you will get a lot of better informed responses.

Some data on your flight conditions and CHT and oil temp will be a good start to convey what "too hot" means in terms of numbers. Airspeed, ambient, throttle, mixture, oil, cut, climb etc would be ideal parameters but what ever you have is a good place to start. After all, installing a plenum will be $$$ and Hrs, so let's make sure it is well invested.
__________________
Bill

RV-7
Lord Kelvin:
I often say that when you can measure what you are speaking about,
and express it in numbers, you know something about it; but when you
cannot measure it, when you cannot express it in numbers, your knowledge
is of a meager and unsatisfactory kind.
Reply With Quote
  #3  
Old 02-15-2021, 06:11 AM
Raymo's Avatar
Raymo Raymo is offline
 
Join Date: Nov 2014
Location: Richmond Hill, GA (KLHW)
Posts: 2,308
Default

Also check that your mag timing is not advanced vs MFG spec.
__________________
Ray
RV-7A - Slider - N495KL - First flt 27 Jan 17
O-360-A4M w/ AFP FM-150 FI, Dual PMags, Vetterman Trombone Exh, SkyTech starter, BandC Alt (PP failed after 226 hrs)
Catto 3 blade NLE, FlightLines Interior, James cowl, plenum & intake, Anti-Splat -14 seat mod and nose gear support
All lines by TSFlightLines (aka Hoser)
Reply With Quote
  #4  
Old 02-15-2021, 06:53 AM
DanH's Avatar
DanH DanH is online now
 
Join Date: Oct 2005
Location: 08A
Posts: 9,889
Default

What Bill said.

A "plenum" is just an enclosed air space. What we call a plenum in our little world is actually a lid to close the roof of said space, for the sole purpose of eliminating flap seal leakage. It has no other purpose. Really good flap seals are not going to be as leak free as a really good plenum lid...but not every lid is good, and some flap seals are excellent.

Point is, you already have a plenum. You merely need to seal its perimeter....along with all the other potential leaks.

Let's see some photos.
__________________
Dan Horton
RV-8 SS
Barrett IO-390
Reply With Quote
  #5  
Old 02-15-2021, 07:23 AM
dan carley dan carley is offline
 
Join Date: Jan 2005
Posts: 659
Default Plenum

To give you a idea
On a hard climb cht can go
To 425 degrees
And cruise at2450 cht around 375-390
Egt cruise app 1375

Is this normal
Danny carley
Reply With Quote
  #6  
Old 02-15-2021, 08:35 AM
Carl Froehlich's Avatar
Carl Froehlich Carl Froehlich is offline
 
Join Date: Dec 2007
Location: Dogwood Airpark (VA42)
Posts: 2,898
Default

Quote:
Originally Posted by dan carley View Post
To give you a idea
On a hard climb cht can go
To 425 degrees
And cruise at2450 cht around 375-390
Egt cruise app 1375

Is this normal
Danny carley
The short answer - yes.

Carl
Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -6. The time now is 03:39 PM.


The VAFForums come to you courtesy Delta Romeo, LLC. By viewing and participating in them you agree to build your plane using standardized methods and practices and to fly it safely and in accordance with the laws governing the country you are located in.