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rv10free2fly(at)yahoo.com
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 Posted: Sat Feb 14, 2015 10:09 pm Post subject: Rear Aft Case Baffle Modification to Enable More Airflow Aro |
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Could anyone please indicate if they have modified the Right Aft Case Baffle (CB-1007A) to enable more airflow around the fins of the right rearmost cylinder head fins?
The No. 5 cylinder head fins are very shallow where they butt up against the Right Aft Case Baffle and was thinking of modifying the case baffle to enable more airflow around the cylinder fins.
A friend has conducted this modification on his RV-6 and has reported reduced rearmost cylinder head temperatures.
As per Tim Olsons advice I am also filing out the cooling gaps between the fins on each cylinder near the spark plugs. After shining a torch down there, some of the fins are just showing an air gap due to the casting flash. If you've also done this, is there an easier way to do this compared to using a very narrow flat file?
Warm regards
Patrick
<pre><b><font size=3D2 color="#000000" face=3D"courier new,courier">
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rleffler
Joined: 05 Nov 2006
Posts: 680
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| Posted: Sun Feb 15, 2015 2:54 am Post subject: Rear Aft Case Baffle Modification to Enable More Airflow Aro |
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I did this last summer and it took me awhile, but a small file is the only way I know how to finish the filings smooth. I did use a long #30 bit to help remove some of the mass. I had several fins that were almost completely block.
I also placed a couple washers on the screw that goes into the aft side of #5 cylinder. This helped quite a bit as well by creating a small gap between the cylinder and the baffle.
Bob
Sent from my iPad
| Quote: | On Feb 15, 2015, at 1:06 AM, Patrick Pulis <rv10free2fly(at)yahoo.com.au> wrote:
Could anyone please indicate if they have modified the Right Aft Case Baffle (CB-1007A) to enable more airflow around the fins of the right rearmost cylinder head fins?
The No. 5 cylinder head fins are very shallow where they butt up against the Right Aft Case Baffle and was thinking of modifying the case baffle to enable more airflow around the cylinder fins.
A friend has conducted this modification on his RV-6 and has reported reduced rearmost cylinder head temperatures.
As per Tim Olsons advice I am also filing out the cooling gaps between the fins on each cylinder near the spark plugs. After shining a torch down there, some of the fins are just showing an air gap due to the casting flash. If you've also done this, is there an easier way to do this compared to using a very narrow flat file?
Warm regards
Patrick
<photo.JPG>
<pre><b><font size=3D2 color="#000000" face=3D"courier new,courier">
</b></font></pre>
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Bob Leffler
N410BL - Phase I
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rv10free2fly(at)yahoo.com
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| Posted: Sun Feb 15, 2015 3:43 am Post subject: Rear Aft Case Baffle Modification to Enable More Airflow Aro |
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Bob
Did you notice and change (i.e. reduction in CHT on #5) after filing out and enlarging the fin holes and adding the washer?
I'm thinking of modifying the baffle itself to allow more air to flow around the aft side of the #5 cylinder.
Warm regards
Patrick
| Quote: | On 15 Feb 2015, at 21:22, Bob Leffler <rv(at)thelefflers.com> wrote:
I did this last summer and it took me awhile, but a small file is the only way I know how to finish the filings smooth. I did use a long #30 bit to help remove some of the mass. I had several fins that were almost completely block.
I also placed a couple washers on the screw that goes into the aft side of #5 cylinder. This helped quite a bit as well by creating a small gap between the cylinder and the baffle.
Bob
Sent from my iPad
> On Feb 15, 2015, at 1:06 AM, Patrick Pulis <rv10free2fly(at)yahoo.com.au> wrote:
>
> Could anyone please indicate if they have modified the Right Aft Case Baffle (CB-1007A) to enable more airflow around the fins of the right rearmost cylinder head fins?
>
> The No. 5 cylinder head fins are very shallow where they butt up against the Right Aft Case Baffle and was thinking of modifying the case baffle to enable more airflow around the cylinder fins.
> A friend has conducted this modification on his RV-6 and has reported reduced rearmost cylinder head temperatures.
>
> As per Tim Olsons advice I am also filing out the cooling gaps between the fins on each cylinder near the spark plugs. After shining a torch down there, some of the fins are just showing an air gap due to the casting flash. If you've also done this, is there an easier way to do this compared to using a very narrow flat file?
>
> Warm regards
>
> Patrick
> <photo.JPG>
>
> <pre><b><font size=3D2 color="#000000" face=3D"courier new,courier">
>
>
> </b></font></pre>
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rleffler
Joined: 05 Nov 2006
Posts: 680
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| Posted: Sun Feb 15, 2015 4:43 am Post subject: Rear Aft Case Baffle Modification to Enable More Airflow Aro |
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Most definitely! I think the drop was about 10f, but I would have to look at my logs to get the precise drop. It went from being one of the hottest, to being one of the coolest.
Bob
Sent from my iPad
| Quote: | On Feb 15, 2015, at 6:40 AM, Patrick Pulis <rv10free2fly(at)yahoo.com.au> wrote:
Bob
Did you notice and change (i.e. reduction in CHT on #5) after filing out and enlarging the fin holes and adding the washer?
I'm thinking of modifying the baffle itself to allow more air to flow around the aft side of the #5 cylinder.
Warm regards
Patrick
> On 15 Feb 2015, at 21:22, Bob Leffler <rv(at)thelefflers.com> wrote:
>
>
>
> I did this last summer and it took me awhile, but a small file is the only way I know how to finish the filings smooth. I did use a long #30 bit to help remove some of the mass. I had several fins that were almost completely block.
>
> I also placed a couple washers on the screw that goes into the aft side of #5 cylinder. This helped quite a bit as well by creating a small gap between the cylinder and the baffle.
>
> Bob
>
> Sent from my iPad
>
>> On Feb 15, 2015, at 1:06 AM, Patrick Pulis <rv10free2fly(at)yahoo.com.au> wrote:
>>
>> Could anyone please indicate if they have modified the Right Aft Case Baffle (CB-1007A) to enable more airflow around the fins of the right rearmost cylinder head fins?
>>
>> The No. 5 cylinder head fins are very shallow where they butt up against the Right Aft Case Baffle and was thinking of modifying the case baffle to enable more airflow around the cylinder fins.
>> A friend has conducted this modification on his RV-6 and has reported reduced rearmost cylinder head temperatures.
>>
>> As per Tim Olsons advice I am also filing out the cooling gaps between the fins on each cylinder near the spark plugs. After shining a torch down there, some of the fins are just showing an air gap due to the casting flash. If you've also done this, is there an easier way to do this compared to using a very narrow flat file?
>>
>> Warm regards
>>
>> Patrick
>> <photo.JPG>
>>
>> <pre><b><font size=3D2 color="#000000" face=3D"courier new,courier">
>>
>>
>> </b></font></pre>
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| | - The Matronics RV10-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
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_________________
Bob Leffler
N410BL - Phase I
http://mykitlog.com/rleffler |
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n223rv(at)wolflakeairport
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| Posted: Sun Feb 15, 2015 5:15 am Post subject: Rear Aft Case Baffle Modification to Enable More Airflow Aro |
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Adding a couple washers behind #5 (or behind #3 on a 4 cylinder engine) is a pretty standard RV trick. It definitely reduces CHT on that cylinder. I learned it on my RV-4, and did it again on my RV-10.
-Mike Kraus
Sent from my iPhone
| Quote: | On Feb 15, 2015, at 1:06 AM, Patrick Pulis <rv10free2fly(at)yahoo.com.au> wrote:
Could anyone please indicate if they have modified the Right Aft Case Baffle (CB-1007A) to enable more airflow around the fins of the right rearmost cylinder head fins?
The No. 5 cylinder head fins are very shallow where they butt up against the Right Aft Case Baffle and was thinking of modifying the case baffle to enable more airflow around the cylinder fins.
A friend has conducted this modification on his RV-6 and has reported reduced rearmost cylinder head temperatures.
As per Tim Olsons advice I am also filing out the cooling gaps between the fins on each cylinder near the spark plugs. After shining a torch down there, some of the fins are just showing an air gap due to the casting flash. If you've also done this, is there an easier way to do this compared to using a very narrow flat file?
Warm regards
Patrick
<photo.JPG>
<pre><b><font size=3D2 color="#000000" face=3D"courier new,courier">
</b></font></pre>
|
| | - The Matronics RV10-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?RV10-List |
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bill.peyton
Joined: 19 Sep 2010
Posts: 198
Location: St. Louis, MO
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| Posted: Sun Feb 15, 2015 5:52 am Post subject: Re: Rear Aft Case Baffle Modification to Enable More Airflow |
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To really fix it you need to increase the airflow behind the #5 cylinder. Ultimately the only way I was able to get #5 in line with the rest of the cylinders was to trim the front dams to around 1/3 of their original height and then to modify the rear baffle by extending the stock slit to come up further on the baffle and allow the straightening of the top bend to obtain a 1/8th inch gap behind the #5 cylinder. I used RTV to fill in the gap created by the mod. I ordered a new baffle piece to modify and install at the next annual to eliminate the RTV. Below is the best photo I can find. I did not file any of the fins, I just made sure there were no leaks. My CHT will rarely get to 400 in a climb unless its over 90 degrees OAT., and that's only in an extended full throttle climb. I typically climb out at 120kts.
| | - The Matronics RV10-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
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Bill
WA0SYV
Aviation Partners, LLC |
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