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Cylinder front baffle question

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n223rv(at)wolflakeairport
Guest

Posted: Tue Jul 05, 2011 7:40 am Post subject: Cylinder front baffle question

Just curious what the size is of everyones front cylinder baffles, the little ones on the front of the cylinders to block airflow to the #1 and #2 cylinders?  Stock size is about 2.5".



Is anyone flying with them totally removed?  



Just curious what the different sizes are out there...

-Mike Kraus



Sent from my iPhone

dmaib(at)mac.com
Guest

Posted: Tue Jul 05, 2011 7:56 am Post subject: Cylinder front baffle question

Mine are totally removed with my current inlet setup. Mine is a bit  

different than most due to the AC compressor installation that  

affects the LH inlet. Prior to this setup, I flew with the RH cut  

down about 50%. I believe there are many flying with partial or no  

front baffles. My hangar neighbor took both of his out to solve  

cooling issues on a stock setup.



David Maib

40559

flying



On Jul 5, 2011, at 11:38 AM, Michael Kraus wrote:



 	  Quote: 	
		   

 <n223rv(at)wolflakeairport.net>



 Just curious what the size is of everyones front cylinder baffles,  

 the little ones on the front of the cylinders to block airflow to  

 the #1 and #2 cylinders?  Stock size is about 2.5".



 Is anyone flying with them totally removed?



 Just curious what the different sizes are out there...

 -Mike Kraus



 Sent from my iPhone

kdbelue(at)charter.net
Guest

Posted: Tue Jul 05, 2011 8:26 am Post subject: Cylinder front baffle question

I never installed mine. CHT are all within 30.



Sent from my iPhone



On Jul 5, 2011, at 10:38 AM, Michael Kraus <n223rv(at)wolflakeairport.net> wrote:



 	  Quote: 	
		   

 

 Just curious what the size is of everyones front cylinder baffles, the little ones on the front of the cylinders to block airflow to the #1 and #2 cylinders?  Stock size is about 2.5".

 

 Is anyone flying with them totally removed?  

 

 Just curious what the different sizes are out there...

 -Mike Kraus

 

 Sent from my iPhone

Strasnuts

Joined: 10 Feb 2009
Posts: 502
Location: Salt Lake City, UT

Posted: Tue Jul 05, 2011 8:36 am Post subject: Re: Cylinder front baffle question

I cut mine exactly in half before I flew.  Now my #5 cylinder is the hottest CHT.  My #1 is fairly cool.  Now I wish I had a little extra material on the front of #1 to even them out.  I powder coated mine so I wanted the final size before I installed them.  My #5 is still way under the limits and I still haven't taken the time to really seal the baffles.

_________________
40936
RV-10 SB N801VR Flying
780 Hours
SuperSTOL 60 hours

bruce1hwjohnson(at)yahoo.
Guest

Posted: Tue Jul 05, 2011 10:18 am Post subject: Cylinder front baffle question

HI Michael, I took mine out after running them for 20 hrs. It reduced my temps about 20 degrees. Now instead of # 2 being the warmest # 6 is by about 25 degrees. 

 



   

From: Michael Kraus <n223rv(at)wolflakeairport.net>

To: rv10-list(at)matronics.com

Sent: Tuesday, July 5, 2011 8:38 AM

Subject: Cylinder front baffle question



--> RV10-List message posted by: Michael Kraus <n223rv(at)wolflakeairport.net (n223rv(at)wolflakeairport.net)>



Just curious what the size is of everyones front cylinder baffles, the little ones  on the front of the cylinders to block airflow to the #1 and #2 cylinders?  Stock size is about 2.5".



Is anyone flying with them totally removed?  



Just curious what the different sizes are out there.  --> nbsp;                    =======================

 [quote][b]

Bob Turner

Joined: 03 Jan 2009
Posts: 885
Location: Castro Valley, CA

Posted: Tue Jul 05, 2011 10:18 am Post subject: Re: Cylinder front baffle question

Note: I'm still in phase 1.



My front cylinders were hotter than the others. I cut 1/2" off each air dam.

#1 was still hottest, so I removed the air dam there. Result is that now #5 cht is hotter than #1. #2 is still slightly hotter than others on the left side. Now, I think:



I need to cut another 1/2" off the #2 air dam, and put the #1 back on but with most of the material removed.

_________________
Bob Turner
RV-10 QB

rleffler

Joined: 05 Nov 2006
Posts: 680

Posted: Tue Jul 05, 2011 11:36 am Post subject: Cylinder front baffle question

That's my current "opportunity".  I want to powder coat too, but the

decision is if I powder coat them now, then I may have to deal with cooling

issues later, or powder coat after the baffles are "tweaked", but then can I

get the baffles clean enough to powder coat later?



Bob

--

_________________
Bob Leffler
N410BL - Phase I
http://mykitlog.com/rleffler

Kellym

Joined: 10 Jan 2006
Posts: 1705
Location: Sun Lakes AZ

Posted: Tue Jul 05, 2011 11:55 am Post subject: Cylinder front baffle question

We are only talking some pieces of flat 2024 with one right angle, 

correct? Why not make some identical trial pieces to get size right, 

then take the final pieces, adjust size and powder coat? They will just 

have 2-3 rivets holding them that won't be powder coated. Not sure it 

makes sense to try and finalize all the baffling and then powder coat as 

one unit.

On 7/5/2011 12:27 PM, Bob Leffler wrote:

[quote] 



 That's my current "opportunity".  I want to powder coat too, but the

 decision is if I powder coat them now, then I may have to deal with cooling

 issues later, or powder coat after the baffles are "tweaked", but then can I

 get the baffles clean enough to powder coat later?



 Bob

 --

_________________
Kelly McMullen
A&P/IA, EAA Tech Counselor # 5286
KCHD

Kelly McMullen

Joined: 16 Apr 2008
Posts: 1188
Location: Sun Lakes AZ

Posted: Tue Jul 05, 2011 12:03 pm Post subject: Cylinder front baffle question

If your rear cylinders are hotter than front you need some of the

baffles. That is their purpose, to even up the cooling between front

and rear. Finding the right size to minimize differences is part of

your initial flight testing.



On Tue, Jul 5, 2011 at 11:12 AM, Bruce Johnson

<bruce1hwjohnson(at)yahoo.com> wrote:

 	  Quote: 	
		   HI Michael, I took mine out after running them for 20 hrs. It reduced my

 temps about 20 degrees. Now instead of # 2 being the warmest # 6 is by about

 25 degrees.



 From: Michael Kraus <n223rv(at)wolflakeairport.net>

 To: rv10-list(at)matronics.com

 Sent: Tuesday, July 5, 2011 8:38 AM

 Subject: Cylinder front baffle question



 



 Just curious what the size is of everyones front cylinder baffles, the

 little ones on the front of the cylinders to block airflow to the #1 and #2

 cylinders?  Stock size is about 2.5".



 Is anyone flying with them totally removed?



 Just curious what the different sizes are out there.  --> nbsp;

        =======================

_________________
Kelly McMullen
A&P/IA, EAA Tech Counselor
KCHD

Strasnuts

Joined: 10 Feb 2009
Posts: 502
Location: Salt Lake City, UT

Posted: Tue Jul 05, 2011 12:03 pm Post subject: Cylinder front baffle question

so Bob,

I know they are all different but if I was to do it over on mine, I would 

leave 3/4 on the 1,3,5 side and half on the 2,4,6 side.

---

_________________
40936
RV-10 SB N801VR Flying
780 Hours
SuperSTOL 60 hours

Strasnuts

Joined: 10 Feb 2009
Posts: 502
Location: Salt Lake City, UT

Posted: Tue Jul 05, 2011 12:08 pm Post subject: Cylinder front baffle question

I like it.  Maybe have a bunch powdercoated and use little bolts on the 

front and trade them out until it is right.

---

_________________
40936
RV-10 SB N801VR Flying
780 Hours
SuperSTOL 60 hours

rene(at)felker.com
Guest

Posted: Tue Jul 05, 2011 12:20 pm Post subject: Cylinder front baffle question

Just to throw a little gas on this fire.  I did cut my baffles down a

little, but was concerned with the other end of spectrum...shock cooling.

My temps were real high over the first XX hours, but got better as the

engine was broken in.  I wish my cooling was better, but have not seen

anything that would be worth trying....at least not beyond what I have

already done.  I just came out of ABQ yesterday and my oil temp got up to

225 and a couple of cylinders were at 410.  I just slowed down my climb to

get the temperatures in line and pressed on to my initial cruising altitude

of 14500.



I get many more shock cooling alarms then I do over temp......so I have

decided to stick with what I got for right now.  I may try to close up the

gap in the lower cowl in front of the front gear leg, but that would only be

if I open up the slot more to allow the lower cowl to be R&R'd easier.



Rene' Felker

N423CF

801-721-6080



--

n223rv(at)wolflakeairport
Guest

Posted: Tue Jul 05, 2011 12:29 pm Post subject: Cylinder front baffle question

Thanks Kelly, I am aware of how they work, but that wasn't my question.  I am working on balancing mine now.  Mine seem best with them removed.  1 and 2 were my hottest, followed by #5 and #6.  I'm just curious with what others are seeing and if others have them totally removed.  It appears that lots of people do have them removed.

Sent from my iPhone

On Jul 5, 2011, at 3:59 PM, Kelly McMullen <apilot2(at)gmail.com> wrote:

 	  Quote: 	

 If your rear cylinders are hotter than front you need some of the

 baffles. That is their purpose, to even up the cooling between front

 and rear. Finding the right size to minimize differences is part of

 your initial flight testing.

 On Tue, Jul 5, 2011 at 11:12 AM, Bruce Johnson

 <bruce1hwjohnson(at)yahoo.com> wrote:

> HI Michael, I took mine out after running them for 20 hrs. It reduced my

> temps about 20 degrees. Now instead of # 2 being the warmest # 6 is by about

> 25 degrees.

> 

> From: Michael Kraus <n223rv(at)wolflakeairport.net>

> To: rv10-list(at)matronics.com

> Sent: Tuesday, July 5, 2011 8:38 AM

> Subject: Cylinder front baffle question

> 

> 

> 

> Just curious what the size is of everyones front cylinder baffles, the

> little ones on the front of the cylinders to block airflow to the #1 and #2

> cylinders?  Stock size is about 2.5".

> 

> Is anyone flying with them totally removed?

> 

> Just curious what the different sizes are out there.  --> nbsp;

>        =======================

> 

> 

> 

> 

> 

> 

> 

> 

>

Kelly McMullen

Joined: 16 Apr 2008
Posts: 1188
Location: Sun Lakes AZ

Posted: Tue Jul 05, 2011 7:02 pm Post subject: Cylinder front baffle question

You must have a tight cooling limit set on your system(maybe 20 or 30

degrees). There is no way you are going to "shock cool" a naturally

aspirated engine with air cooling. If it were possible, engines flying

through rain or operating in the arctic would be breaking all over the

place. When you pull power, even from 410 degrees, the engine is only

going to cool to 270, maybe 250 over 3-5 minutes.

It heats a whole lot faster, in 10-20 seconds when you apply full

power for take off. That is the quickest any temperature change is

going to happen. I'd suggest changing your alarm to 50 degrees. It

will be very rare for that to go off. Shock cooling in the context of

naturally aspirated engines is simply an old wives tale.



On Tue, Jul 5, 2011 at 1:16 PM, Rene Felker <rene(at)felker.com> wrote:

 	  Quote: 	
		   



 Just to throw a little gas on this fire.  I did cut my baffles down a

 little, but was concerned with the other end of spectrum...shock cooling.

 My temps were real high over the first XX hours, but got better as the

 engine was broken in.  I wish my cooling was better, but have not seen

 anything that would be worth trying....at least not beyond what I have

 already done.  I just came out of ABQ yesterday and my oil temp got up to

 225 and a couple of cylinders were at 410.  I just slowed down my climb to

 get the temperatures in line and pressed on to my initial cruising altitude

 of 14500.



 I get many more shock cooling alarms then I do over temp......so I have

 decided to stick with what I got for right now.  I may try to close up the

 gap in the lower cowl in front of the front gear leg, but that would only be

 if I open up the slot more to allow the lower cowl to be R&R'd easier.



 Rene' Felker

 N423CF

 801-721-6080

_________________
Kelly McMullen
A&P/IA, EAA Tech Counselor
KCHD

daveleikam(at)wi.rr.com
Guest

Posted: Tue Jul 05, 2011 7:28 pm Post subject: Cylinder front baffle question

Totally removed them.  Good temps.



David Leikam

RV10

Flying

On Jul 5, 2011, at 10:38 AM, Michael Kraus wrote:



 	  Quote: 	
		   

 

 Just curious what the size is of everyones front cylinder baffles, the little ones on the front of the cylinders to block airflow to the #1 and #2 cylinders?  Stock size is about 2.5".

 

 Is anyone flying with them totally removed?  

 

 Just curious what the different sizes are out there...

 -Mike Kraus

 

 Sent from my iPhone

Kellym

Joined: 10 Jan 2006
Posts: 1705
Location: Sun Lakes AZ

Posted: Tue Jul 05, 2011 7:59 pm Post subject: Cylinder front baffle question

One other idea Bob. Don't install baffles for phase one. Experiment with 

aluminum tape pasted on the front cylinders. When you get it right, trim 

baffles to match, powder coat and install.

On 7/5/2011 12:27 PM, Bob Leffler wrote:

 	  Quote: 	
		   



 That's my current "opportunity".  I want to powder coat too, but the

 decision is if I powder coat them now, then I may have to deal with cooling

 issues later, or powder coat after the baffles are "tweaked", but then can I

 get the baffles clean enough to powder coat later?



 Bob

_________________
Kelly McMullen
A&P/IA, EAA Tech Counselor # 5286
KCHD

rene(at)felker.com
Guest

Posted: Tue Jul 05, 2011 8:01 pm Post subject: Cylinder front baffle question

I will look at that again, but I think it is set to 50 degrees a minute.  If

I remember right , it is a rate setting in the GRT system.  I will check

that tomorrow when I am at the hanger.



Rene'

801-721-6080



--

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