|
-
POSTING RULES

-
Donate yearly (please).
-
Advertise in here!
-
Today's Posts
|
Insert Pics
|

06-07-2020, 07:12 PM
|
 |
|
|
Join Date: Aug 2008
Location: Brandon, MS
Posts: 59
|
|
O-360 RV-8 cylinder fins covered
Working on the condition inspection with an I/A he commented about the orange rubber wrapped around each cylinder. I bought this flying -8 last year and am still learning about it, even though I was a partner in a -6A for 10 years, also bought as a flying aircraft. This -8 has an O-360 and fixed pitch prop and an aluminum plenum. Anyone familiar with this wrap? It appears to cover from the 2 o?clock to 10 o?clock positions on the inner fins and from the 3 o?clock to 9 o?clock positions on the outer fins, with the top of the fins uncovered.
__________________
Sold -6A, flying an 8 & a C182RG. Donated for 2020.
|

06-07-2020, 07:35 PM
|
|
|
|
Join Date: Nov 2007
Location: Cary, N.C.
Posts: 1,216
|
|
What are the CHTs? Is each cylinder instrumented?
__________________
Noel
RV-6A N6NF
tip-up
flying
|

06-07-2020, 08:08 PM
|
 |
|
|
Join Date: Aug 2008
Location: Brandon, MS
Posts: 59
|
|
CHT’s seem normal, perhaps a bit lower than I saw in the -6A with an O320. Maybe 335-360. It has a 4 cylinder CHT/EGT gauge from Electronics International.
__________________
Sold -6A, flying an 8 & a C182RG. Donated for 2020.
|

06-07-2020, 08:33 PM
|
|
|
|
Join Date: Sep 2007
Location: Central IL
Posts: 5,516
|
|
My IO360M1b parallel valve is wrapped about that much. Wrapping the cylinders will make no difference to the CHT measurement or very little, but shifting the airflow will. It does not mean that nothing is happening, just not reflected in the CHT. Removing them completely might even increase the CHT due to increasing air demand by cylinders dropping plenum pressure, thereby lowering mass across the heads.
What engine is this, parallel or angle valve?
__________________
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.”
|

06-07-2020, 08:57 PM
|
 |
|
|
Join Date: May 2013
Location: Mount Vernon, Wa
Posts: 643
|
|
__________________
Ken W.
Mount Vernon, WA
2020 VAF Supporter
|

06-08-2020, 05:53 AM
|
 |
|
|
Join Date: Aug 2008
Location: Brandon, MS
Posts: 59
|
|
I believe it is a parallel valve engine.
__________________
Sold -6A, flying an 8 & a C182RG. Donated for 2020.
|

06-08-2020, 05:55 AM
|
 |
|
|
Join Date: Aug 2008
Location: Brandon, MS
Posts: 59
|
|
It does look very similar to the photo you posted, Ken.
__________________
Sold -6A, flying an 8 & a C182RG. Donated for 2020.
|

06-08-2020, 06:11 AM
|
 |
|
|
Join Date: Oct 2005
Location: 08A
Posts: 9,500
|
|
So the cylinders are wrapped, or the heads or wrapped, or both?
Pictures?
__________________
Dan Horton
RV-8 SS
Barrett IO-390
|

06-08-2020, 06:50 AM
|
 |
|
|
Join Date: Aug 2008
Location: Brandon, MS
Posts: 59
|
|
Both cylinders and heads are wrapped. My original post did not use the correct terminology.
__________________
Sold -6A, flying an 8 & a C182RG. Donated for 2020.
|

06-08-2020, 08:26 AM
|
|
|
|
Join Date: Apr 2009
Location: Stockton, California
Posts: 296
|
|
I haven't seen this approach before and am confused (seriously- not kidding).
It doesn't "fit" with my prior experience.
What is the benefit from blocking cooling air access to the "top" of the cylinders??
Plenty of support in the NACA cooling papers that argue this approach increases cooling drag and lowers heat transfer - especially on the "bottom" of the cylinders.
|
| Thread Tools |
Search this Thread |
|
|
|
| Display Modes |
Linear Mode
|
Posting Rules
|
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts
HTML code is Off
|
|
|
All times are GMT -6. The time now is 02:49 AM.
|