---------------------------------------------------------- Yak-List Digest Archive --- Total Messages Posted Mon 02/09/09: 10 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 06:03 AM - Re: Custom Nanchang Canopy Covers Now Availible (Craig Winkelmann) 2. 06:05 AM - Blackwell Exhaust (Craig Winkelmann) 3. 07:53 AM - Re: Blackwell Exhaust (Mark Davis) 4. 08:19 AM - Re: Re: Custom Nanchang Canopy Covers Now Availible (vectorwarbirds@aol.com) 5. 09:18 AM - Re: Blackwell Exhaust (Nigel Willson) 6. 10:34 AM - Re: Blackwell Exhaust (Mark Davis) 7. 11:09 AM - CJ Main Switch Panel Placard (Barry Hancock) 8. 11:35 AM - Re: Blackwell Exhaust (Nigel Willson) 9. 12:04 PM - Re: Blackwell Exhaust (tjyak50) 10. 01:56 PM - Re: Blackwell Exhaust (A. Dennis Savarese) ________________________________ Message 1 _____________________________________ Time: 06:03:50 AM PST US Subject: Yak-List: Re: Custom Nanchang Canopy Covers Now Availible From: "Craig Winkelmann" Need one for the CJ with a Malcolm Hood!! Read this topic online here: http://forums.matronics.com/viewtopic.php?p=229319#229319 ________________________________ Message 2 _____________________________________ Time: 06:05:19 AM PST US Subject: Yak-List: Blackwell Exhaust From: "Craig Winkelmann" Is anyone out there flying either a Housai or M-14 with Bill's new tuned exhaust? I am wondering what performance increase you've seen AND what is the change in exhaust noise (how much louder is it). Thanks, Craig Read this topic online here: http://forums.matronics.com/viewtopic.php?p=229320#229320 ________________________________ Message 3 _____________________________________ Time: 07:53:56 AM PST US From: "Mark Davis" Subject: Re: Yak-List: Blackwell Exhaust My concern, after looking at the pictures of the system, on the typical M-14P without gapless rings is the potential of a hydraulic lock on the bottom cylinders that can't drain and puke out the occasional glug of oil they all do when pulling them through. If it didn't cause a lock, the top of the wings would have a nice slick black walkway after startup. Mark Davis N44YK ----- Original Message ----- From: "Craig Winkelmann" Sent: Monday, February 09, 2009 7:05 AM Subject: Yak-List: Blackwell Exhaust > > Is anyone out there flying either a Housai or M-14 with Bill's new tuned > exhaust? I am wondering what performance increase you've seen AND what is > the change in exhaust noise (how much louder is it). > > Thanks, > > Craig > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=229320#229320 > > > -- > Checked by AVG. > 1:39 PM > > ________________________________ Message 4 _____________________________________ Time: 08:19:39 AM PST US Subject: Re: Yak-List: Re: Custom Nanchang Canopy Covers Now Availible From: vectorwarbirds@aol.com Sorry not making those, too many people either just put on one or both canopies and it just makes it too much trouble at the moment. Bunndini -----Original Message----- From: Craig Winkelmann Sent: Mon, 9 Feb 2009 7:03 am Subject: Yak-List: Re: Custom Nanchang Canopy Covers Now Availible Need one for the CJ with a Malcolm Hood!! Read this topic online here: http://forums.matronics.com/viewtopic.php?p=229319#229319 ________________________________ Message 5 _____________________________________ Time: 09:18:23 AM PST US From: "Nigel Willson" Subject: RE: Yak-List: Blackwell Exhaust That's why the oil drain kit is a must - AND it's also a must to be used CORRECTLY! i.e. Open after engine shutdown and LEAVE open. Only close after pulling through before start. -----Original Message----- From: owner-yak-list-server@matronics.com [mailto:owner-yak-list-server@matronics.com] On Behalf Of Mark Davis Sent: 09 February 2009 15:53 Subject: Re: Yak-List: Blackwell Exhaust My concern, after looking at the pictures of the system, on the typical M-14P without gapless rings is the potential of a hydraulic lock on the bottom cylinders that can't drain and puke out the occasional glug of oil they all do when pulling them through. If it didn't cause a lock, the top of the wings would have a nice slick black walkway after startup. Mark Davis N44YK ----- Original Message ----- From: "Craig Winkelmann" Sent: Monday, February 09, 2009 7:05 AM Subject: Yak-List: Blackwell Exhaust > > Is anyone out there flying either a Housai or M-14 with Bill's new tuned > exhaust? I am wondering what performance increase you've seen AND what is > the change in exhaust noise (how much louder is it). > > Thanks, > > Craig > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=229320#229320 > > > -- > Checked by AVG. > 1:39 PM > > ________________________________ Message 6 _____________________________________ Time: 10:34:57 AM PST US From: "Mark Davis" Subject: Re: Yak-List: Blackwell Exhaust Nigel, Even with the oil drain kit in the lower intake tubes opened up on shutdown, I still get oil out of the stacks at times. That's the oil I'm worried about backing up into the cylinders or blowing on top of the wing. Exhaust side, not intake side. On the stock exhaust system any oil that leaks down into a cylinder with an open exhaust valve can just let gravity do its thing and run on out just like the oil does on the intake side with a drain kit. Mark Davis N44YK ----- Original Message ----- From: "Nigel Willson" Sent: Monday, February 09, 2009 10:16 AM Subject: RE: Yak-List: Blackwell Exhaust > > That's why the oil drain kit is a must - AND it's also a must to be used > CORRECTLY! > i.e. Open after engine shutdown and LEAVE open. Only close after pulling > through before start. > > > -----Original Message----- > From: owner-yak-list-server@matronics.com > [mailto:owner-yak-list-server@matronics.com] On Behalf Of Mark Davis > Sent: 09 February 2009 15:53 > To: yak-list@matronics.com > Subject: Re: Yak-List: Blackwell Exhaust > > > My concern, after looking at the pictures of the system, on the typical > M-14P without gapless rings is the potential of a hydraulic lock on the > bottom cylinders that can't drain and puke out the occasional glug of oil > they all do when pulling them through. If it didn't cause a lock, the top > of the wings would have a nice slick black walkway after startup. > > Mark Davis > N44YK > > ----- Original Message ----- > From: "Craig Winkelmann" > To: > Sent: Monday, February 09, 2009 7:05 AM > Subject: Yak-List: Blackwell Exhaust > > >> >> Is anyone out there flying either a Housai or M-14 with Bill's new tuned >> exhaust? I am wondering what performance increase you've seen AND what >> is > >> the change in exhaust noise (how much louder is it). >> >> Thanks, >> >> Craig >> >> >> >> >> Read this topic online here: >> >> http://forums.matronics.com/viewtopic.php?p=229320#229320 >> >> >> >> >> >> >> >> >> >> >> >> -- >> Checked by AVG. >> 1:39 PM >> >> > > > -- > Checked by AVG. > 6:50 AM > > ________________________________ Message 7 _____________________________________ Time: 11:09:17 AM PST US From: Barry Hancock Subject: Yak-List: CJ Main Switch Panel Placard Gang, We can now do custom switch placards for your CJ. These placards compliment our CJ placard system and are done in a metal photo process that is just as clean as silk screening and lasts 15 years in direct sunlight. The placards are in the same style as the original old style CJ placards (old style was black metal with letters in silver relief...newer style is paper). A sample is attached. We will recreate this to match the switches in YOUR airplane. Cost, including artwork, is $165. Please email me off list if you are interested. A complete set of placards can also be done for the Yak, but would need at least 10 orders to cover initial set up (approx. 20 hours @ $50/hr.). Happy flying, Barry ________________________________ Message 8 _____________________________________ Time: 11:35:36 AM PST US From: "Nigel Willson" Subject: RE: Yak-List: Blackwell Exhaust Yes, so do I. That oil is from the inlets that can't be sucked up from the inlets just by pulling through - so it gets pulled into the cylinders on start. Because of the drain kit, (in theory) the amount of oil left in the inlets is too small to hydraulic a cylinder. Even if the oil backs up on the exhaust side, surely the pull through is going to force it out of the cylinder via the exhaust valve exhaust anyway? And then the exhaust valve closes stopping that oil coming back in. The next stroke is induction (exhaust valve still closed), and the next compression (still closed). The hydraulic lock only happens on the compression - so the only way oil can come in for that is from the INLET side - hence the drains being on the inlets. Or am I missing something here? Nigel. -----Original Message----- From: owner-yak-list-server@matronics.com [mailto:owner-yak-list-server@matronics.com] On Behalf Of Mark Davis Sent: 09 February 2009 18:32 Subject: Re: Yak-List: Blackwell Exhaust Nigel, Even with the oil drain kit in the lower intake tubes opened up on shutdown, I still get oil out of the stacks at times. That's the oil I'm worried about backing up into the cylinders or blowing on top of the wing. Exhaust side, not intake side. On the stock exhaust system any oil that leaks down into a cylinder with an open exhaust valve can just let gravity do its thing and run on out just like the oil does on the intake side with a drain kit. Mark Davis N44YK ----- Original Message ----- From: "Nigel Willson" Sent: Monday, February 09, 2009 10:16 AM Subject: RE: Yak-List: Blackwell Exhaust > > That's why the oil drain kit is a must - AND it's also a must to be used > CORRECTLY! > i.e. Open after engine shutdown and LEAVE open. Only close after pulling > through before start. > > > -----Original Message----- > From: owner-yak-list-server@matronics.com > [mailto:owner-yak-list-server@matronics.com] On Behalf Of Mark Davis > Sent: 09 February 2009 15:53 > To: yak-list@matronics.com > Subject: Re: Yak-List: Blackwell Exhaust > > > My concern, after looking at the pictures of the system, on the typical > M-14P without gapless rings is the potential of a hydraulic lock on the > bottom cylinders that can't drain and puke out the occasional glug of oil > they all do when pulling them through. If it didn't cause a lock, the top > of the wings would have a nice slick black walkway after startup. > > Mark Davis > N44YK > > ----- Original Message ----- > From: "Craig Winkelmann" > To: > Sent: Monday, February 09, 2009 7:05 AM > Subject: Yak-List: Blackwell Exhaust > > >> >> Is anyone out there flying either a Housai or M-14 with Bill's new tuned >> exhaust? I am wondering what performance increase you've seen AND what >> is > >> the change in exhaust noise (how much louder is it). >> >> Thanks, >> >> Craig >> >> >> >> >> Read this topic online here: >> >> http://forums.matronics.com/viewtopic.php?p=229320#229320 >> >> >> >> >> >> >> >> >> >> >> >> -- >> Checked by AVG. >> 1:39 PM >> >> > > > -- > Checked by AVG. > 6:50 AM > > ________________________________ Message 9 _____________________________________ Time: 12:04:27 PM PST US Subject: Yak-List: Re: Blackwell Exhaust From: "tjyak50" The Blackwell exhaust system has a drain built into it. Any headers with a low spot are connected to the exhaust drains. Different from the intake drain since it is high temp. It prevents any oil from ever building up in the exhaust system. T-28 has a similar system if I recall, although they just have holes in the exhaust. Blackwells system drains to a common point. Actually makes the airplane very tidy. Read this topic online here: http://forums.matronics.com/viewtopic.php?p=229397#229397 ________________________________ Message 10 ____________________________________ Time: 01:56:39 PM PST US From: "A. Dennis Savarese" Subject: Re: Yak-List: Blackwell Exhaust All true Nigel. But what happens if the piston is already on the compression stroke while pulling the prop through and there is sufficient oil collected in the combustion chamber when the piston gets to close to TDC? Then it's too late for an opening exhaust valve to be of any benefit. Dennis ----- Original Message ----- From: Nigel Willson To: yak-list@matronics.com Sent: Monday, February 09, 2009 1:31 PM Subject: RE: Yak-List: Blackwell Exhaust Yes, so do I. That oil is from the inlets that can't be sucked up from the inlets just by pulling through - so it gets pulled into the cylinders on start. Because of the drain kit, (in theory) the amount of oil left in the inlets is too small to hydraulic a cylinder. Even if the oil backs up on the exhaust side, surely the pull through is going to force it out of the cylinder via the exhaust valve exhaust anyway? And then the exhaust valve closes stopping that oil coming back in. The next stroke is induction (exhaust valve still closed), and the next compression (still closed). The hydraulic lock only happens on the compression - so the only way oil can come in for that is from the INLET side - hence the drains being on the inlets. Or am I missing something here? Nigel. -----Original Message----- From: owner-yak-list-server@matronics.com [mailto:owner-yak-list-server@matronics.com] On Behalf Of Mark Davis Sent: 09 February 2009 18:32 To: yak-list@matronics.com Subject: Re: Yak-List: Blackwell Exhaust Nigel, Even with the oil drain kit in the lower intake tubes opened up on shutdown, I still get oil out of the stacks at times. That's the oil I'm worried about backing up into the cylinders or blowing on top of the wing. Exhaust side, not intake side. On the stock exhaust system any oil that leaks down into a cylinder with an open exhaust valve can just let gravity do its thing and run on out just like the oil does on the intake side with a drain kit. Mark Davis N44YK ----- Original Message ----- From: "Nigel Willson" To: Sent: Monday, February 09, 2009 10:16 AM Subject: RE: Yak-List: Blackwell Exhaust > > That's why the oil drain kit is a must - AND it's also a must to be used > CORRECTLY! > i.e. Open after engine shutdown and LEAVE open. Only close after pulling > through before start. > > > -----Original Message----- > From: owner-yak-list-server@matronics.com > [mailto:owner-yak-list-server@matronics.com] On Behalf Of Mark Davis > Sent: 09 February 2009 15:53 > To: yak-list@matronics.com > Subject: Re: Yak-List: Blackwell Exhaust > > > My concern, after looking at the pictures of the system, on the typical > M-14P without gapless rings is the potential of a hydraulic lock on the > bottom cylinders that can't drain and puke out the occasional glug of oil > they all do when pulling them through. If it didn't cause a lock, the top > of the wings would have a nice slick black walkway after startup. > > Mark Davis > N44YK > > ----- Original Message ----- > From: "Craig Winkelmann" > To: > Sent: Monday, February 09, 2009 7:05 AM > Subject: Yak-List: Blackwell Exhaust > > >> >> Is anyone out there flying either a Housai or M-14 with Bill's new tuned >> exhaust? I am wondering what performance increase you've seen AND what >> is > >> the change in exhaust noise (how much louder is it). >> >> Thanks, >> >> Craig >> >> >> >> >> Read this topic online here: >> >> http://forums.matronics.com/viewtopic.php?p=229320#229320 >> >> >> >> >> >> >> >> >> >> >> >> -- >> Checked by AVG. >> 1:39 PM >> >> > > > > > > > > > > > > -- > Checked by AVG. > 6:50 AM > > ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message yak-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/Yak-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/yak-list Browse Digests http://www.matronics.com/digest/yak-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.