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  #1  
Old 01-19-2018, 08:07 AM
givo givo is offline
 
Join Date: Oct 2017
Location: Padova , Italy
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Default High Temperature during take off in RV-7

I guess this issue has been already discussed many time in this forum . Nevertheless Im relatively young in experimental field and in RVs so I post the following question , hoping someone is so nice to give me some suggestion .
I have problems of temperature in my RV-7 180 CV . I have two CHT , one on the most cooled , one on the least cooled cylinder .
I have also a small door on the lower cowling ( I miss the English term , in Italian is flabello ) that can be open with a servo .
With this door open , during take off also in winter with externa temperature of 30 50 F , the temperature of the less favorable cylinder goes from 350-400 F to 450 F . The other more cooled cylinder will stay around 400 F .
After take off I usually level the aircraft quite soon reducing power as soon as feasible and until both temperature return to 350 F but it take quite a while .
Than I resume normal level flight at 75% power .
From now on temperature are relatively stable around 350 F but if I start to climb also starting from an altitude as 3000 ft the temperature of the less favorable cylinder goes to 400 F .
Question : there is a way to improve ventilation inside the cowling ? Shall I install second door on the lower cowling ? or may be shall I enlarge the bottom opening ? regarding the baffle they seems to sit quite tight with the cowling tank you for suggestions Giulio
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  #2  
Old 01-19-2018, 08:19 AM
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N941WR N941WR is offline
 
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What ignition do you have and what is it timed at?
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  #3  
Old 01-19-2018, 08:23 AM
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N941WR N941WR is offline
 
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flabello = Flap or "Cowl Flap" if on the engine cowl to help cool the engine.

"flabello" = "Flap" o "Cowl Flap" Se sul cofano motore per aiutare a raffreddare il motore.
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RV-9 (Yes, it's a dragon tail)
O-360 w/ dual P-mags
Build the plane you want, not the plane others want you to build!
SC86 - Easley, SC
www.repucci.com/bill/baf.html
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  #4  
Old 01-19-2018, 08:26 AM
givo givo is offline
 
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My engine is a LYCOMING O-360-A1A with two magnet Marvel-Schebler Type MA-4 5 , standard timed I think
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Old 01-19-2018, 08:29 AM
givo givo is offline
 
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Quote:
Originally Posted by N941WR View Post
flabello = Flap or "Cowl Flap" if on the engine cowl to help cool the engine.

"flabello" = "Flap" o "Cowl Flap" Se sul cofano motore per aiutare a raffreddare il motore.
pefetto grazie , sei italiano ?
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Old 01-19-2018, 09:30 AM
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N941WR N941WR is offline
 
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Quote:
Originally Posted by givo View Post
pefetto grazie , sei italiano ?
Sì, io sono del patrimonio italiano. I miei nonni dal lato del mio padre (Reppucci e DePresszió) sono stati da San Potito Ultra, Provincia di Avellino. Anche se sono nata e cresciuta negli Stati Uniti.

Dove in Italia vivi? (Non importa, ti vedo zona da Padova.)

(Ho anche cheat e uso MSWord per aiutare con la mia traduzione come il mio italiano è come un due anni).

Ciao
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RV-9 (Yes, it's a dragon tail)
O-360 w/ dual P-mags
Build the plane you want, not the plane others want you to build!
SC86 - Easley, SC
www.repucci.com/bill/baf.html

Last edited by N941WR : 01-19-2018 at 09:34 AM.
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Old 01-19-2018, 09:32 AM
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N941WR N941WR is offline
 
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Quote:
Originally Posted by givo View Post
My engine is a LYCOMING O-360-A1A with two magnet Marvel-Schebler Type MA-4 – 5 , standard timed I think …
È il carburatore. Io sono curioso di sapere quali accensione avete e sono essi a tempo correttamente?

(In English: That is the Carburetor. I am curious about what ignition you have and are they timed correctly?)
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Bill R.
RV-9 (Yes, it's a dragon tail)
O-360 w/ dual P-mags
Build the plane you want, not the plane others want you to build!
SC86 - Easley, SC
www.repucci.com/bill/baf.html
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  #8  
Old 01-19-2018, 09:37 AM
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Mine was similar until I installed the gear fairings but I also had to retard the timing of my P-Mag a couple degrees to help until the gear fairings were installed.

If fairings are installed, check baffling for leaks and confirm timing is correct for the mags and/or electronic ignition.

It is fine to have 400-425 in climb but should stay below 400 (380, ideally) in cruise. Mine cylinders run 360-390 in summer temp cruise, depending on mixture setting.
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Last edited by Raymo : 01-24-2018 at 09:24 AM.
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  #9  
Old 01-19-2018, 09:42 AM
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Mel Mel is offline
 
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Are you sure that the "eyebrows" are installed in the upper cowling over the inlets? If these are missing, it will cause overheating at high AOA.
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  #10  
Old 01-19-2018, 10:29 AM
givo givo is offline
 
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Location: Padova , Italy
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Quote:
Originally Posted by N941WR View Post
S, io sono del patrimonio italiano. I miei nonni dal lato del mio padre (Reppucci e DePresszi) sono stati da San Potito Ultra, Provincia di Avellino. Anche se sono nata e cresciuta negli Stati Uniti.

Dove in Italia vivi? (Non importa, ti vedo zona da Padova.)

(Ho anche cheat e uso MSWord per aiutare con la mia traduzione come il mio italiano come un due anni).

Ciao
molto bene grazie delle info , io ogni tanto vengo in US per lavoro ( pharma ) ciao Giulio
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