---------------------------------------------------------- RV10-List Digest Archive --- Total Messages Posted Sun 09/07/14: 6 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 01:20 PM - Acceptable CHT spread (Mike Whisky) 2. 01:34 PM - Re: Acceptable CHT spread (Kelly McMullen) 3. 01:36 PM - Re: Acceptable CHT spread (Jesse Saint) 4. 02:49 PM - Re: Acceptable CHT spread (Carl Froehlich) 5. 05:55 PM - Re: Acceptable CHT spread (Pascal) 6. 07:06 PM - Re: Acceptable CHT spread (Kelly McMullen) ________________________________ Message 1 _____________________________________ Time: 01:20:56 PM PST US Subject: RV10-List: Acceptable CHT spread From: "Mike Whisky" Hi I was wondering what CHT spread is acceptable in cruise. I currently have a spread if 32 between my hottest and coolest cylinder in LOP cruise. I understand that a spread of 0 would be the ultimate goal but what spread do other see in average. Mike -------- RV-10 builder (flying) #511 Read this topic online here: http://forums.matronics.com/viewtopic.php?p=430163#430163 ________________________________ Message 2 _____________________________________ Time: 01:34:17 PM PST US Subject: Re: RV10-List: Acceptable CHT spread From: Kelly McMullen Acceptable to whom? I would call your spread very acceptable if it is hottest to coolest. If it were plus or minus 30 some degrees I might try to get it a bit closer, but many certified planes are no better than that. If you can get the EGT's to peak within 0.5gph or less, then CHT differences are going to mostly depend on baffling caused airflow differences. They can be fine tuned with the dams in front of #1 and #2 cylinders. On Sun, Sep 7, 2014 at 1:20 PM, Mike Whisky wrote: > > Hi > I was wondering what CHT spread is acceptable in cruise. > I currently have a spread if 32 between my hottest and coolest cylinder in > LOP cruise. > I understand that a spread of 0 would be the ultimate goal but what spread > do other see in average. > > Mike > > -------- > RV-10 builder (flying) > #511 > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=430163#430163 > > ________________________________ Message 3 _____________________________________ Time: 01:36:15 PM PST US From: Jesse Saint Subject: Re: RV10-List: Acceptable CHT spread The most important thing is that all CHT's be within acceptable limits. After that, the lower the spread the better. In my experience 32 degrees is quite good. I wouldn't worry about getting them closer than that. If you have one or two that are significantly different (ie, 5 are within 5 degrees and one is 30 degrees out), then you could do a little something, but if all are in the mid 300's, then I'd leave it alone. Jesse Saint Saint Aviation, Inc. 352-427-0285 jesse@saintaviation.com Sent from my iPad > On Sep 7, 2014, at 4:20 PM, "Mike Whisky" wrote: > > > Hi > I was wondering what CHT spread is acceptable in cruise. > I currently have a spread if 32 between my hottest and coolest cylinder in LOP cruise. > I understand that a spread of 0 would be the ultimate goal but what spread do other see in average. > > Mike > > -------- > RV-10 builder (flying) > #511 > > > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=430163#430163 > > > > > > > > > > ________________________________ Message 4 _____________________________________ Time: 02:49:39 PM PST US From: "Carl Froehlich" Subject: RE: RV10-List: Acceptable CHT spread Agree with all the comments. Now for me, after injector balancing I have EGTs all peak within 0.2 GPH but #3 CHT is always the hottest by 30 degrees on climb out, 25 degrees in LOP cruise (#3 hottest, #4 coolest in both cases, the rest of the cylinders within a few degrees of #4 CHT). As #3 is in the middle, do I trim the cylinder inter baffles that came with the engine to cool off #3 or what? I already looked for casting flanges and such to clear between the cooling fins on #3 - no joy. Carl -----Original Message----- From: owner-rv10-list-server@matronics.com [mailto:owner-rv10-list-server@matronics.com] On Behalf Of Jesse Saint Sent: Sunday, September 07, 2014 4:36 PM Subject: Re: RV10-List: Acceptable CHT spread The most important thing is that all CHT's be within acceptable limits. After that, the lower the spread the better. In my experience 32 degrees is quite good. I wouldn't worry about getting them closer than that. If you have one or two that are significantly different (ie, 5 are within 5 degrees and one is 30 degrees out), then you could do a little something, but if all are in the mid 300's, then I'd leave it alone. Jesse Saint Saint Aviation, Inc. 352-427-0285 jesse@saintaviation.com Sent from my iPad > On Sep 7, 2014, at 4:20 PM, "Mike Whisky" wrote: > > > Hi > I was wondering what CHT spread is acceptable in cruise. > I currently have a spread if 32 between my hottest and coolest cylinder in LOP cruise. > I understand that a spread of 0 would be the ultimate goal but what spread do other see in average. > > Mike > > -------- > RV-10 builder (flying) > #511 > > > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=430163#430163 > > > > > > > > > > ________________________________ Message 5 _____________________________________ Time: 05:55:12 PM PST US From: "Pascal" Subject: Re: RV10-List: Acceptable CHT spread #3 for me as well, except my #3 is by far the coolest by 30F from the others on climb and within 5 degrees of #4 in cruise but still 30-40F off from #6 my hottest. -----Original Message----- From: Carl Froehlich Sent: Sunday, September 07, 2014 2:49 PM Subject: RE: RV10-List: Acceptable CHT spread Agree with all the comments. Now for me, after injector balancing I have EGTs all peak within 0.2 GPH but #3 CHT is always the hottest by 30 degrees on climb out, 25 degrees in LOP cruise (#3 hottest, #4 coolest in both cases, the rest of the cylinders within a few degrees of #4 CHT). As #3 is in the middle, do I trim the cylinder inter baffles that came with the engine to cool off #3 or what? I already looked for casting flanges and such to clear between the cooling fins on #3 - no joy. Carl -----Original Message----- From: owner-rv10-list-server@matronics.com [mailto:owner-rv10-list-server@matronics.com] On Behalf Of Jesse Saint Sent: Sunday, September 07, 2014 4:36 PM Subject: Re: RV10-List: Acceptable CHT spread The most important thing is that all CHT's be within acceptable limits. After that, the lower the spread the better. In my experience 32 degrees is quite good. I wouldn't worry about getting them closer than that. If you have one or two that are significantly different (ie, 5 are within 5 degrees and one is 30 degrees out), then you could do a little something, but if all are in the mid 300's, then I'd leave it alone. Jesse Saint Saint Aviation, Inc. 352-427-0285 jesse@saintaviation.com Sent from my iPad > On Sep 7, 2014, at 4:20 PM, "Mike Whisky" wrote: > > > Hi > I was wondering what CHT spread is acceptable in cruise. > I currently have a spread if 32 between my hottest and coolest cylinder in LOP cruise. > I understand that a spread of 0 would be the ultimate goal but what spread do other see in average. > > Mike > > -------- > RV-10 builder (flying) > #511 > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=430163#430163 > > ________________________________ Message 6 _____________________________________ Time: 07:06:06 PM PST US Subject: Re: RV10-List: Acceptable CHT spread From: Kelly McMullen Push the normalize button on the engine analyzer, if it has that feature, so they all appear to be same temp, and ignore the difference. There is no value in attempting to get it more balanced. On Sun, Sep 7, 2014 at 2:49 PM, Carl Froehlich wrote: > carl.froehlich@verizon.net> > > Agree with all the comments. > > Now for me, after injector balancing I have EGTs all peak within 0.2 GPH > but > #3 CHT is always the hottest by 30 degrees on climb out, 25 degrees in LOP > cruise (#3 hottest, #4 coolest in both cases, the rest of the cylinders > within a few degrees of #4 CHT). As #3 is in the middle, do I trim the > cylinder inter baffles that came with the engine to cool off #3 or what? > > I already looked for casting flanges and such to clear between the cooling > fins on #3 - no joy. > > Carl > > -----Original Message----- > From: owner-rv10-list-server@matronics.com > [mailto:owner-rv10-list-server@matronics.com] On Behalf Of Jesse Saint > Sent: Sunday, September 07, 2014 4:36 PM > To: rv10-list@matronics.com > Subject: Re: RV10-List: Acceptable CHT spread > > > The most important thing is that all CHT's be within acceptable limits. > After that, the lower the spread the better. In my experience 32 degrees is > quite good. I wouldn't worry about getting them closer than that. If you > have one or two that are significantly different (ie, 5 are within 5 > degrees > and one is 30 degrees out), then you could do a little something, but if > all > are in the mid 300's, then I'd leave it alone. > > Jesse Saint > Saint Aviation, Inc. > 352-427-0285 > jesse@saintaviation.com > > Sent from my iPad > > > On Sep 7, 2014, at 4:20 PM, "Mike Whisky" wrote: > > > > > > Hi > > I was wondering what CHT spread is acceptable in cruise. > > I currently have a spread if 32 between my hottest and coolest cylinder > in > LOP cruise. > > I understand that a spread of 0 would be the ultimate goal but what > spread > do other see in average. > > > > Mike > > > > -------- > > RV-10 builder (flying) > > #511 > > > > > > > > > > Read this topic online here: > > > > http://forums.matronics.com/viewtopic.php?p=430163#430163 > > > > > > > > > > > > > > > > > > > > > > ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message rv10-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/RV10-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/rv10-list Browse Digests http://www.matronics.com/digest/rv10-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.