---------------------------------------------------------- RV-List Digest Archive --- Total Messages Posted Wed 06/22/11: 5 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 03:20 AM - Re: compression test and mag timing equipment (Michael Kraus) 2. 07:12 AM - Re: compression test and mag timing equipment (Kelly McMullen) 3. 07:57 AM - Re: compression test and mag timing equipment (Greg Young) 4. 08:02 AM - Re: compression test and mag timing equipment (Michael Kraus) 5. 08:14 AM - Re: compression test and mag timing equipment (thomas sargent) ________________________________ Message 1 _____________________________________ Time: 03:20:07 AM PST US Subject: Re: RV-List: compression test and mag timing equipment From: Michael Kraus You Typically need one of these too! http://www.aircraftspruce.com/catalog/topages/timing_ind.php Sent from my iPhone On Jun 21, 2011, at 11:32 PM, Kelly McMullen wrote: > > You can follow the old advice and use the smaller orifice(.040) compression tester for engines less than 1000 cu. in. > http://www.aircraftspruce.com/catalog/topages/differentialcylindertester.php > A few years back they started suggesting the larger orifice(.060) for engines 5" and larger bore. No one I know follows that advice. It will show higher compressions which really isn't what you want. Any buzz box magneto timer will work. This $43 unit is about as cheap as they come: *http://www.aircraftspruce.com/catalog/topages/synchronizer.php* > Kelly > A&P/IA > EAA Tech Counselor > > > On 6/21/2011 8:13 PM, thomas sargent wrote: >> I am getting ready to do the annual on my 6A and trying to figure out which cyl. compression tester to get. I have an IO-260-B2B. It has a 5.125" bore. I'm seeing conflicting information about the orifice size needed t\for such an engine. Is it 0.040" or 0.060" >> >> Also, I have but 1 magneto (Lightspeed Ignition on the right). Which magneto timer should I get? Do I need anything else to time the left mag? >> >> Thanks, >> >> -- >> Tom Sargent, N811WT , RV-6A >> * >> >> >> * > > > > ________________________________ Message 2 _____________________________________ Time: 07:12:24 AM PST US From: Kelly McMullen Subject: Re: RV-List: compression test and mag timing equipment Waste of money, IMHO. If you want accurate timing, get/borrow a digital level to determine exact prop position. Once you find the correct mark on your flywheel, it isn't hard to line it up with the case halves, IF you have marks on the engine side of the flywheel. If you only have marks on the front side, you have to use the mark on the starter motor. If you have questions, find an A&P to show you correct positioning...it isn't rocket science. The flower pot isn't so useful because it needs to be positioned on the spinner such that its surface is perpendicular with the ground...hard to do with a tailwheel aircraft. On 6/22/2011 3:15 AM, Michael Kraus wrote: > --> RV-List message posted by: Michael Kraus > > You Typically need one of these too! > > http://www.aircraftspruce.com/catalog/topages/timing_ind.php > > Sent from my iPhone > > On Jun 21, 2011, at 11:32 PM, Kelly McMullen wrote: > >> --> RV-List message posted by: Kelly McMullen >> >> You can follow the old advice and use the smaller orifice(.040) compression tester for engines less than 1000 cu. in. >> http://www.aircraftspruce.com/catalog/topages/differentialcylindertester.php >> A few years back they started suggesting the larger orifice(.060) for engines 5" and larger bore. No one I know follows that advice. It will show higher compressions which really isn't what you want. Any buzz box magneto timer will work. This $43 unit is about as cheap as they come: *http://www.aircraftspruce.com/catalog/topages/synchronizer.php* >> Kelly >> A&P/IA >> EAA Tech Counselor >> >> >> On 6/21/2011 8:13 PM, thomas sargent wrote: >>> I am getting ready to do the annual on my 6A and trying to figure out which cyl. compression tester to get. I have an IO-260-B2B. It has a 5.125" bore. I'm seeing conflicting information about the orifice size needed t\for such an engine. Is it 0.040" or 0.060" >>> >>> Also, I have but 1 magneto (Lightspeed Ignition on the right). Which magneto timer should I get? Do I need anything else to time the left mag? >>> >>> Thanks, >>> >>> -- >>> Tom Sargent, N811WT , RV-6A >>> * >>> >>> >>> * >> >> >> > > ________________________________ Message 3 _____________________________________ Time: 07:57:05 AM PST US From: "Greg Young" Subject: RE: RV-List: compression test and mag timing equipment The flower pot is not needed on Lycomings that have a timing mark on the flywheel. Even my GO-480 had a timing mark so perhaps all Lycomings have one somewhere. Not so on Continentals. I had buy one for the IO-550 in my Navion but don't need it for the RV. Greg Young -----Original Message----- From: owner-rv-list-server@matronics.com [mailto:owner-rv-list-server@matronics.com] On Behalf Of Michael Kraus Sent: Wednesday, June 22, 2011 5:15 AM Subject: Re: RV-List: compression test and mag timing equipment You Typically need one of these too! http://www.aircraftspruce.com/catalog/topages/timing_ind.php Sent from my iPhone On Jun 21, 2011, at 11:32 PM, Kelly McMullen wrote: ________________________________ Message 4 _____________________________________ Time: 08:02:06 AM PST US Subject: Re: RV-List: compression test and mag timing equipment From: Michael Kraus Interesting, used it successfully for 9 years with no problems, on my taildragger RV-4...... Inexpensive and worked great for me. And it has worked great on my RV-10 for 1 year. Sent from my iPhone On Jun 22, 2011, at 10:08 AM, Kelly McMullen wrote: > > Waste of money, IMHO. If you want accurate timing, get/borrow a digital level to determine exact prop position. Once you find the correct mark on your flywheel, it isn't hard to line it up with the case halves, IF you have marks on the engine side of the flywheel. If you only have marks on the front side, you have to use the mark on the starter motor. If you have questions, find an A&P to show you correct positioning...it isn't rocket science. The flower pot isn't so useful because it needs to be positioned on the spinner such that its surface is perpendicular with the ground...hard to do with a tailwheel aircraft. > > > On 6/22/2011 3:15 AM, Michael Kraus wrote: >> --> RV-List message posted by: Michael Kraus >> >> You Typically need one of these too! >> >> http://www.aircraftspruce.com/catalog/topages/timing_ind.php >> >> Sent from my iPhone >> >> On Jun 21, 2011, at 11:32 PM, Kelly McMullen wrote: >> >>> --> RV-List message posted by: Kelly McMullen >>> >>> You can follow the old advice and use the smaller orifice(.040) compression tester for engines less than 1000 cu. in. >>> http://www.aircraftspruce.com/catalog/topages/differentialcylindertester.php >>> A few years back they started suggesting the larger orifice(.060) for engines 5" and larger bore. No one I know follows that advice. It will show higher compressions which really isn't what you want. Any buzz box magneto timer will work. This $43 unit is about as cheap as they come: *http://www.aircraftspruce.com/catalog/topages/synchronizer.php* >>> Kelly >>> A&P/IA >>> EAA Tech Counselor >>> >>> >>> On 6/21/2011 8:13 PM, thomas sargent wrote: >>>> I am getting ready to do the annual on my 6A and trying to figure out which cyl. compression tester to get. I have an IO-260-B2B. It has a 5.125" bore. I'm seeing conflicting information about the orifice size needed t\for such an engine. Is it 0.040" or 0.060" >>>> >>>> Also, I have but 1 magneto (Lightspeed Ignition on the right). Which magneto timer should I get? Do I need anything else to time the left mag? >>>> >>>> Thanks, >>>> >>>> -- >>>> Tom Sargent, N811WT , RV-6A >>>> * >>>> >>>> >>>> * >>> >>> >>> >> >> >> >> > > > > ________________________________ Message 5 _____________________________________ Time: 08:14:15 AM PST US Subject: Re: RV-List: compression test and mag timing equipment From: thomas sargent Oops, just notice I said engine was IO-260, It is of course an IO-360-B2B. Thanks for all the info by the way. On Tue, Jun 21, 2011 at 8:13 PM, thomas sargent wrote: > I am getting ready to do the annual on my 6A and trying to figure out which > cyl. compression tester to get. I have an IO-260-B2B. It has a 5.125" > bore. I'm seeing conflicting information about the orifice size needed > t\for such an engine. Is it 0.040" or 0.060" > > Also, I have but 1 magneto (Lightspeed Ignition on the right). Which > magneto timer should I get? Do I need anything else to time the left mag? > > Thanks, > > -- > Tom Sargent, N811WT , RV-6A > > * > > * > > -- Tom Sargent ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message rv-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/RV-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/rv-list Browse Digests http://www.matronics.com/digest/rv-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.