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Cowling Mods for 160HP Engine

Afif Saybe
 

I recently factory overhauled my O320E2G Long EZ and upgraded from 150-160HP. I've done a couple fo flight and I've noticed higher engine temperatures (in the 420+ degF) than my previous configuration. I have a conventional updraft configuration in my LEZ and I'm wondering if its time to modify the cowls for additional cooling. I'm also planning of replacing the straight pipes too.... Attached are pictures of my LEZ with current cowlings....Would love to hear of experiences of LEZ with 160HP engine and temperatures range operation....Thanks in advance!

Regards,
Afif Saybe
LEZ HR-ATQ

Don B
 

I’m running a160hp 0-320 and switched to armpit scoops for cooling.  




On Feb 23, 2020, at 4:50 PM, Afif Saybe <afif@...> wrote:



I recently factory overhauled my O320E2G Long EZ and upgraded from 150-160HP. I've done a couple fo flight and I've noticed higher engine temperatures (in the 420+ degF) than my previous configuration. I have a conventional updraft configuration in my LEZ and I'm wondering if its time to modify the cowls for additional cooling. I'm also planning of replacing the straight pipes too.... Attached are pictures of my LEZ with current cowlings....Would love to hear of experiences of LEZ with 160HP engine and temperatures range operation....Thanks in advance!

Regards,
Afif Saybe
LEZ HR-ATQ

Attachments:

Don B
 

See attached pictures


On Feb 23, 2020, at 8:45 PM, Don B via Groups.Io <donberlin475@...> wrote:

I’m running a160hp 0-320 and switched to armpit scoops for cooling.  




On Feb 23, 2020, at 4:50 PM, Afif Saybe <afif@...> wrote:



I recently factory overhauled my O320E2G Long EZ and upgraded from 150-160HP. I've done a couple fo flight and I've noticed higher engine temperatures (in the 420+ degF) than my previous configuration. I have a conventional updraft configuration in my LEZ and I'm wondering if its time to modify the cowls for additional cooling. I'm also planning of replacing the straight pipes too.... Attached are pictures of my LEZ with current cowlings....Would love to hear of experiences of LEZ with 160HP engine and temperatures range operation....Thanks in advance!

Regards,
Afif Saybe
LEZ HR-ATQ

Attachments:

Attachments:

kent ashton
 

A first guess is that your exit area is too small but the best way to diagnose cooling is to set up some piccolo tubes connected to a water manometer or cheap ebay manometer and check the pressure above and below the cylinder fins.  See the discussion here.   Post #38 shows some piccolo tubes.  http://www.vansairforce.com/community/showthread.php?t=143064.   Another discussion here.  https://www.canardzone.com/forums/topic/18661-kents-long-ez-project/?do=findComment&comment=61602

A lycoming should have 5.5” of pressure differential across the fins to cool adequately.  If you don’t have 5.5”, you can start trying to figure out why.
-kent

On Feb 23, 2020, at 6:50 PM, Afif Saybe <afif@...> wrote:

I recently factory overhauled my O320E2G Long EZ and upgraded from 150-160HP. I've done a couple fo flight and I've noticed higher engine temperatures (in the 420+ degF) than my previous configuration. I have a conventional updraft configuration in my LEZ and I'm wondering if its time to modify the cowls for additional cooling. I'm also planning of replacing the straight pipes too.... Attached are pictures of my LEZ with current cowlings....Would love to hear of experiences of LEZ with 160HP engine and temperatures range operation....Thanks in advance!

Regards,
Afif Saybe
LEZ HR-ATQ

Attachments:

Neil K
 

If you just recently had the engine overhauled, perhaps the rings haven’t seated yet.  If this is the case, high CHT is not unusual until they seat.

Ill confirm Gary Hunters findings.  It took me 3 tries with my engine guru to come up with the correct carburetor fuel flow nozzles.

I’m running an 0-320 with high compression pistons with the standard NACA scoop on the bottom.  I had to adjust the lower lip slightly to improve cooling during a full power climb on a hot day.

Neil K
C-GNEZ



On Feb 23, 2020, at 6:50 PM, Afif Saybe <afif@...> wrote:

I recently factory overhauled my O320E2G Long EZ and upgraded from 150-160HP. I've done a couple fo flight and I've noticed higher engine temperatures (in the 420+ degF) than my previous configuration. I have a conventional updraft configuration in my LEZ and I'm wondering if its time to modify the cowls for additional cooling. I'm also planning of replacing the straight pipes too.... Attached are pictures of my LEZ with current cowlings....Would love to hear of experiences of LEZ with 160HP engine and temperatures range operation....Thanks in advance!

Regards,
Afif Saybe
LEZ HR-ATQ

Attachments:


Afif Saybe
 

Hi Don....l do you have a picture of your armpit scoops???

Regards,
Afif

Don B
 





On Feb 24, 2020, at 8:33 AM, Afif Saybe <afif@...> wrote:

Hi Don....l do you have a picture of your armpit scoops???

Regards,
Afif

Afif Saybe
 

Thanks for sharing the pictures.....

Regards,
Afif

Bob Holliston
 

Afif, Mark's right. Rebuilt engines ALWAYS run hotter till the rings break in. This sometimes creates a dilemma. You need to run the engine at at least 75% power to break in the rings properly which creates more heat than running at, say, 60% power. Most updraft cooled EZ's, at least the ones that I've seen, have ramps in the lower cowl to force the air up through the two forward cylinders. The rear cylinders normally run cooler because the rear bulkhead/baffle forces the air up through them. One thing I've seen that works well is to cut holes in the top cowling, say, 1 1/2" X 5" above the hot cylinder(s). They suck the air right up through there. Maybe cut the holes then repair after the engine breaks in? It works but introduces lots of dirty air in front of the prop. Seems like Gary Hertzler did a drawing on how to do the holes with a way to keep some or most of the air attached to the cowling. I remember seeing one of those holes on Dave Ronneberg's Berkut. 


On Sun, Feb 23, 2020 at 7:45 PM Don B via Groups.Io <donberlin475=yahoo.com@groups.io> wrote:
I’m running a160hp 0-320 and switched to armpit scoops for cooling.  




On Feb 23, 2020, at 4:50 PM, Afif Saybe <afif@...> wrote:



I recently factory overhauled my O320E2G Long EZ and upgraded from 150-160HP. I've done a couple fo flight and I've noticed higher engine temperatures (in the 420+ degF) than my previous configuration. I have a conventional updraft configuration in my LEZ and I'm wondering if its time to modify the cowls for additional cooling. I'm also planning of replacing the straight pipes too.... Attached are pictures of my LEZ with current cowlings....Would love to hear of experiences of LEZ with 160HP engine and temperatures range operation....Thanks in advance!

Regards,
Afif Saybe
LEZ HR-ATQ

Attachments:

Attachments:



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Afif
 

Thanks Bob for the additional facts. Interesting. Will talk to Gary Hertzler about it for some insight of the cowling openings. I will focus mainly right now in trying to break in process and monitoring the CHT history in various flights….

Regards,
Afif


On Feb 25, 2020, at 1:00 PM, Bob Holliston <bob.holliston@...> wrote:

Afif, Mark's right. Rebuilt engines ALWAYS run hotter till the rings break in. This sometimes creates a dilemma. You need to run the engine at at least 75% power to break in the rings properly which creates more heat than running at, say, 60% power. Most updraft cooled EZ's, at least the ones that I've seen, have ramps in the lower cowl to force the air up through the two forward cylinders. The rear cylinders normally run cooler because the rear bulkhead/baffle forces the air up through them. One thing I've seen that works well is to cut holes in the top cowling, say, 1 1/2" X 5" above the hot cylinder(s). They suck the air right up through there. Maybe cut the holes then repair after the engine breaks in? It works but introduces lots of dirty air in front of the prop. Seems like Gary Hertzler did a drawing on how to do the holes with a way to keep some or most of the air attached to the cowling. I remember seeing one of those holes on Dave Ronneberg's Berkut. 

On Sun, Feb 23, 2020 at 7:45 PM Don B via Groups.Io <donberlin475=yahoo.com@groups.io> wrote:
I’m running a160hp 0-320 and switched to armpit scoops for cooling.  




On Feb 23, 2020, at 4:50 PM, Afif Saybe <afif@...> wrote:



I recently factory overhauled my O320E2G Long EZ and upgraded from 150-160HP. I've done a couple fo flight and I've noticed higher engine temperatures (in the 420+ degF) than my previous configuration. I have a conventional updraft configuration in my LEZ and I'm wondering if its time to modify the cowls for additional cooling. I'm also planning of replacing the straight pipes too.... Attached are pictures of my LEZ with current cowlings....Would love to hear of experiences of LEZ with 160HP engine and temperatures range operation....Thanks in advance!

Regards,
Afif Saybe
LEZ HR-ATQ

Attachments:

Attachments:






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