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Housai Valve Seats

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graemefrew(at)gmail.com
Guest

Posted: Wed Feb 11, 2009 12:24 pm Post subject: 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

  [quote][b]

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mark.bitterlich(at)navy.m
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Posted: Wed Feb 11, 2009 1:03 pm Post subject: Housai Valve Seats

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



 



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vectorwarbirds(at)aol.com
Guest

Posted: Wed Feb 11, 2009 4:52 pm Post subject: 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

 

 

 

   

 

   

 

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rogerbyak(at)yahoo.com
Guest

Posted: Thu Feb 12, 2009 3:50 pm Post subject: Housai Valve Seats

AUTO FUEL?    Does it have alcohol or MBTE in it?  rb



--- On Wed, 2/11/09, vectorwarbirds(at)aol.com <vectorwarbirds(at)aol.com> wrote:



From: vectorwarbirds(at)aol.com <vectorwarbirds(at)aol.com>

Subject: Re: Housai Valve Seats

To: yak-list(at)matronics.com

Date: Wednesday, February 11, 2009, 4:51 PM



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

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vectorwarbirds(at)AOL.COM
Guest

Posted: Thu Feb 12, 2009 8:56 pm Post subject: Housai Valve Seats

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

 

   

 

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mark.bitterlich(at)navy.m
Guest

Posted: Fri Feb 13, 2009 10:47 am Post subject: Housai Valve Seats

Are you saying that it is legal to use automobile fuel containing Ethanol in 

an aircraft engine?



Mark Bitterlich



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vectorwarbirds(at)aol.com
Guest

Posted: Fri Feb 13, 2009 12:08 pm Post subject: Housai Valve Seats

Nope!  I am saying that I can run anything I want in my Housai or M14P as its not a certified engine in the USA.  The FAA has no say in what I can run just as long as it placarded on the aircraft in plain sight of the fuel caps.  And mine says so.

 

   

 

   

 

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mark.bitterlich(at)navy.m
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Posted: Fri Feb 13, 2009 12:39 pm Post subject: Housai Valve Seats

You know what?  You're absolutely correct!    



The FAA has absolutely NO SAY SO in what kind of fuel we run in these

Experimental Exhibition category aircraft. 



Mark Bitterlich



 



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