---------------------------------------------------------- Yak-List Digest Archive --- Total Messages Posted Thu 02/12/09: 3 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 01:17 PM - Re: YAK 52 jack point (Bill1200) 2. 03:50 PM - Re: Housai Valve Seats (Roger Bieberdorf) 3. 08:56 PM - Re: Housai Valve Seats (vectorwarbirds@AOL.COM) ________________________________ Message 1 _____________________________________ Time: 01:17:27 PM PST US Subject: Yak-List: Re: YAK 52 jack point From: "Bill1200" One more question, I see there are actually 4 jack points, one on each wing and 2 at the nose wheel. Is it necessary to use all 4, or will 3 do? Read this topic online here: http://forums.matronics.com/viewtopic.php?p=230014#230014 ________________________________ Message 2 _____________________________________ Time: 03:50:20 PM PST US From: Roger Bieberdorf Subject: Re: Yak-List: Housai Valve Seats AUTO FUEL?--- Does it have alcohol or MBTE in it?- rb --- On Wed, 2/11/09, vectorwarbirds@aol.com wrote: From: vectorwarbirds@aol.com Subject: Re: Yak-List: Housai Valve Seats Just for everyones information we cut Housai and M14P valve seats all the t ime, they are not hardened valve seats, just the opposite, they are easy to cut and it takes no special tools that any master mechanic would not have or be able to use.- They are three angle cuts and I suspect they are bron ze or similar material. Anyone who says they needed to dress the stone three times on those seats n eeds new stones! We also have been running auto fuel (87oct) for six years now (200hrs per y ear) with no problems whatsoever.- I suspect most peoples problems arrise from not correctly adjusting the valves out of laziness or not knowing how .. Gary 'Bunndini' Bunn Vector Warbirds USA -----Original Message----- From: Bitterlich, Mark G CIV Det Cherry Point, MALS-14 64E Sent: Wed, 11 Feb 2009 1:59 pm Subject: RE: Yak-List: Housai Valve Seats MALS-14 64E" Graeme, with respect, this is a subject that I feel is unwise to dismiss based on what your friend said when he ground the valve seats in your engine. 1. Unless those seats were made to the exact same specs, you also can not be sure of anything that applies to an engine made in another country, I.E. a Housai compared to an M-14. 2. Not only is the hardness of the seat material massively different at grinding temperatures as compared to combustion temperatures, but the valve material (as well as the valve seats) comes into play. Valve seats are a science unto themselves. For an interesting discourse on the subject, read this: http://www.patentstorm.us/patents/7216427/description.html Bottom line. If you want to run 100% unleaded fuel in these engines for a long period of time with no additives, and not be concerned about it at all, that is clearly your choice. Personally, I tend to side with every technical article written on the subject. Mark Bitterlich -----Original Message----- From: owner-yak-list-server@matronics.com [mailto:owner-yak-list-server@matronics.com] On Behalf Of Graeme Frew Sent: Wednesday, February 11, 2009 3:24 PM Subject: Yak-List: Housai Valve Seats Guys I am sure this will apply to the Russian engine as well. About 5 years ago I had cause to have some valves reground on my Housai engine. A guy who builds race engines made some tooling and cut the seats for me. He said they were the hardest valve seats he had ever seen and had to dress the stone three times per angle he cut in the seat. I figure your lower or no lead fuel will work fine in these engines though your mileage may vary. Graeme Frew ex Nanchang =0A=0A=0A ________________________________ Message 3 _____________________________________ Time: 08:56:44 PM PST US Subject: Re: Yak-List: Housai Valve Seats From: vectorwarbirds@AOL.COM We have run up to 5% ethanol in our mogas, but most gas up here in Prescott is free of ethanol and no MBTE.? It has no effect on any CJ rubber or the diaphragm as we have run long term submersion tests on all.? Bunndini -----Original Message----- From: Roger Bieberdorf Sent: Thu, 12 Feb 2009 4:49 pm Subject: Re: Yak-List: Housai Valve Seats AUTO FUEL???? Does it have alcohol or MBTE in it?? rb --- On Wed, 2/11/09, vectorwarbirds@aol.com wrote: From: vectorwarbirds@aol.com Subject: Re: Yak-List: Housai Valve Seats Just for everyones information we cut Housai and M14P valve seats all the time, they are not hardened valve seats, just the opposite, they are easy to cut and it takes no special tools that any master mechanic would not have or be able to use.? They are three angle cuts and I suspect they are bronze or similar material. Anyone who says they needed to dress the stone three times on those seats needs new stones! We also have been running auto fuel (87oct) for six years now (200hrs per year) with no problems whatsoever.? I suspect most peoples problems arrise from not correctly adjusting the valves out of laziness or not knowing how. Gary 'Bunndini' Bunn Vector Warbirds USA -----Original Message----- From: Bitterlich, Mark G CIV Det Cherry Point, MALS-14 64E Sent: Wed, 11 Feb 2009 1:59 pm Subject: RE: Yak-List: Housai Valve Seats MALS-14 64E" Graeme, with respect, this is a subject that I feel is unwise to dismiss based on what your friend said when he ground the valve seats in your engine. 1. Unless those seats were made to the exact same specs, you also can not be sure of anything that applies to an engine made in another country, I.E. a Housai compared to an M-14. 2. Not only is the hardness of the seat material massively different at grinding temperatures as compared to combustion temperatures, but the valve material (as well as the valve seats) comes into play. Valve seats are a science unto themselves. For an interesting discourse on the subject, read this: http://www.patentstorm.us/patents/7216427/description.html Bottom line. If you want to run 100% unleaded fuel in these engines for a long period of time with no additives, and not be concerned about it at all, that is clearly your choice. Personally, I tend to side with every technical article written on the subject. Mark Bitterlich -----Original Message----- From: owner-yak-list-server@matronics.com [mailto:owner-yak-list-server@matronics.com] On Behalf Of Graeme Frew Sent: Wednesday, February 11, 2009 3:24 PM Subject: Yak-List: Housai Valve Seats Guys I am sure this will apply to the Russian engine as well. About 5 years ago I had cause to have some valves reground on my Housai engine. A guy who builds race engines made some tooling and cut the seats for me. He said they were the hardest valve seats he had ever seen and had to dress the stone three times per angle he cut in the seat. I figure your lower or no lead fuel will work fine in these engines though your mileage may vary. Graeme Frew ex Nanchang ------------------------------------------------------------------------------------- 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.