Zenith-List Digest Archive

Wed 10/20/04


Total Messages Posted: 16



Today's Message Index:
----------------------
 
     1. 06:14 AM - SLA regs (mike honer)
     2. 06:36 AM - Re: 601HDS forms, jigs and molds  (Larry McFarland)
     3. 07:52 AM - Re: 801 on mo-gas (Hinde, Frank George (Corvallis))
     4. 08:15 AM - Re: 801 on mo-gas (Gary Craze)
     5. 08:53 AM - Re: 801 on mo-gas (Hinde, Frank George (Corvallis))
     6. 09:21 AM - Re: 801 on mo-gas (Gary Craze)
     7. 09:40 AM - XL Nosewheel Shimmy (kim.forest@surewest.net) (The Keeners)
     8. 09:57 AM - Re: 801 on mo-gas (Hinde, Frank George (Corvallis))
     9. 12:30 PM - Re: 801 on mo-gas (Hinde, Frank George (Corvallis))
    10. 12:44 PM - Re: Re:Exhaust fumes in cabin (Frank Jones)
    11. 03:52 PM - Re: XL Nosewheel Shimmy (kim.forest@surewest.net) (Brett)
    12. 05:22 PM - Re: XL Nosewheel Shimmy (kim.forest@surewest.net) (Ray Montagne)
    13. 08:19 PM - 701 Wing Installation (Jimmy Parker)
    14. 09:20 PM - Re: 801 on mo-gas (Benford2@aol.com)
    15. 11:05 PM - Sebring FL (Brett)
    16. 11:29 PM - Re: 801 on mo-gas (Dirk Slabbert)
 
 
 


Message 1


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    Time: 06:14:15 AM PST US
    From: "mike honer" <amhoner@rtmc.net>
    Subject: SLA regs
    --> Zenith-List message posted by: "mike honer" <amhoner@rtmc.net> I'm looking at the idea of a valid driver license being used as a medical from slightly different viewpoints: 1. I think the operative word here is "valid." Some months ago, I heard a one-time news report that the DOT was pressing for standard medical requirements for those who wish to obtain driver licenses. No, I don't recall the specifics, except that it didn't go very far. It could be that we are seeing some of that in the SLA regs. 2. Probably it will be the Insurance companies who will wield the big enforcement stick... That is, offering or refusing to offer liability insurance to those who choose to fly on their driver licenses. 3. Great Britain already has a system for this, which I am also a little vague on, I recall it requires the pilot undergo a physical with his own doctor(s). 4. The FAA really doesn't have a very good record of spotting potential incapacitating medical problems, and having a pilot's personal or insurance company physician check him/her out has the potential to do a better job.


    Message 2


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    Time: 06:36:10 AM PST US
    From: "Larry McFarland" <larrymc@qconline.com>
    Subject: Re: 601HDS forms, jigs and molds
    --> Zenith-List message posted by: "Larry McFarland" <larrymc@qconline.com> Bob, I live in East Moline, IL, fly out of MLI and am located on the part Illinois where the Mississippi runs east to west known as the Quad Cities. Larry ----- Original Message ----- From: "Bob Reinero" <reineros@pacbell.net> Subject: Re: Zenith-List: 601HDS forms, jigs and molds > --> Zenith-List message posted by: "Bob Reinero" <reineros@pacbell.net> > > Were are you located, and are they still available? > ----- Original Message ----- > From: "Larry McFarland" <larrymc@qconline.com> > To: <zenith-list@matronics.com> > Subject: Zenith-List: 601HDS forms, jigs and molds > > >> --> Zenith-List message posted by: "Larry McFarland" > <larrymc@qconline.com> >> >> Hi guys, >> I've just realized that I've got all the forms, jigs, some molds >> and some special tooling for the 601HDS structure and >> have no future use for it as I'm now flying. I don't see >> the need for making a second plane. >> >> I need to sell it all with one of my two spare engines. >> The collection occupies a space about 3' x 4' x 8' and weighs a lot. >> >> A couple of molds for the radiator I'll keep to make copies >> yet spoken for, but to get space for this winters home improvement, >> >> I'll also keep the plans and paper associated with my plane, which >> is not for sale. >> >> Anyone interested, let me know. >> >> Larry McFarland - 601HDS - 601HDS (flying and looking forward to paint) >> www.macsmachine.com >> >> > > >


    Message 3


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    Time: 07:52:05 AM PST US
    Subject: 801 on mo-gas
    From: "Hinde, Frank George (Corvallis)" <frank.hinde@hp.com>
    --> Zenith-List message posted by: "Hinde, Frank George (Corvallis)" <frank.hinde@hp.com> Superior recommend retarding the ignition to 22 deg BFTC rather than 25....Apparently Mogas has a faster flame travel and the reduction in timing compensates for it. Frank However,if I'm hearing right, a few degrees of timing reduction would be recommended to prevent detonation? (though I did not read that in Frank's email from Dave Rogers at Superior). It sounds like Superior says mogas is no problem, but do they tune it differently? Superior is at the top of my list for an "experimental version" of an O-360 anyways.


    Message 4


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    Time: 08:15:24 AM PST US
    From: "Gary Craze" <garycraze@hotmail.com>
    Subject: 801 on mo-gas
    --> Zenith-List message posted by: "Gary Craze" <garycraze@hotmail.com> Thanks Frank. That pretty much corresponds with the other data I've got. So it sounds like that if a person really wants to insure proper detonation for the specific fuel they are using on the O-360, then one really needs to adjust the timing to reflect the fuel being used. I suppose you could swap fuels in a pinch without adjusting timing if you had too, and could (generally) probably expect no severe problems. But it sounds like the ultimate solution is an automatic ignition system like GAMI's new PRISM system which will automatically adjust the ignition based on the burn of the fuel being used, so you can swap between mogas and 100LL at whim. The vast majority of time I'm in a place with available 100LL. I did like the cost savings on my old C-170 when I was burning mogas, but a lot of time I had to pump it myself at the gas station and hand fill the plane from 5-gallon cans. It was pretty time consuming and semi-heavy lifting, and I often found myself just taxiing down to the self-serve 100LL pumps and filling it up and biting the cost bullet. But in the semi-distant future, I plan on flying the CH801 to a turf strip I'm building at our ranch outside of San Antonio, so I'd really only have mogas there (though I could easily hop over to a nearby field that does have 100LL and fill up...). Sounds like I'll plan on setting the tuning for 100LL. Many thanks again everyone! Gary Craze Houston, TX N801GC (reserved) -----Original Message----- From: owner-zenith-list-server@matronics.com [mailto:owner-zenith-list-server@matronics.com] On Behalf Of Hinde, Frank George (Corvallis) Subject: RE: Zenith-List: 801 on mo-gas --> Zenith-List message posted by: "Hinde, Frank George (Corvallis)" --> <frank.hinde@hp.com> Superior recommend retarding the ignition to 22 deg BFTC rather than 25....Apparently Mogas has a faster flame travel and the reduction in timing compensates for it. Frank However,if I'm hearing right, a few degrees of timing reduction would be recommended to prevent detonation? (though I did not read that in Frank's email from Dave Rogers at Superior). It sounds like Superior says mogas is no problem, but do they tune it differently? Superior is at the top of my list for an "experimental version" of an O-360 anyways. == direct advertising on the Matronics Forums. == == ==


    Message 5


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    Time: 08:53:54 AM PST US
    Subject: 801 on mo-gas
    From: "Hinde, Frank George (Corvallis)" <frank.hinde@hp.com>
    --> Zenith-List message posted by: "Hinde, Frank George (Corvallis)" <frank.hinde@hp.com> To be honest I don't think the 3 degrees will make that much difference. I intend to set mine to 22 degrees and fill it with watever I can find above 91 oct including 100LL. I wonder how the new auto ignition system senses the fuel octane and corresponding advance?...The way this is done in new auto's is by using a knock sensor...I.e the the timing is advanced until it just pre-ignites and then retards the ignition. Adding knock sensors in an after market situation I did not think was easy...I would want to see a number of these new systems working before I bought one. I can tell you in my little EA 81 soob using 100LL makes no detectable difference and I certainly don't go around adjusting the timing...:)...No "in a pinch" about it. Do you have a website for this new GAMI system?...I'll be purchasing an IO360 next year. Thanks Frank -----Original Message----- From: owner-zenith-list-server@matronics.com [mailto:owner-zenith-list-server@matronics.com] On Behalf Of Gary Craze Subject: RE: Zenith-List: 801 on mo-gas --> Zenith-List message posted by: "Gary Craze" <garycraze@hotmail.com> Thanks Frank. That pretty much corresponds with the other data I've got. So it sounds like that if a person really wants to insure proper detonation for the specific fuel they are using on the O-360, then one really needs to adjust the timing to reflect the fuel being used. I suppose you could swap fuels in a pinch without adjusting timing if you had too, and could (generally) probably expect no severe problems. But it sounds like the ultimate solution is an automatic ignition system like GAMI's new PRISM system which will automatically adjust the ignition based on the burn of the fuel being used, so you can swap between mogas and 100LL at whim. The vast majority of time I'm in a place with available 100LL. I did like the cost savings on my old C-170 when I was burning mogas, but a lot of time I had to pump it myself at the gas station and hand fill the plane from 5-gallon cans. It was pretty time consuming and semi-heavy lifting, and I often found myself just taxiing down to the self-serve 100LL pumps and filling it up and biting the cost bullet. But in the semi-distant future, I plan on flying the CH801 to a turf strip I'm building at our ranch outside of San Antonio, so I'd really only have mogas there (though I could easily hop over to a nearby field that does have 100LL and fill up...). Sounds like I'll plan on setting the tuning for 100LL. Many thanks again everyone! Gary Craze Houston, TX N801GC (reserved) -----Original Message----- From: owner-zenith-list-server@matronics.com [mailto:owner-zenith-list-server@matronics.com] On Behalf Of Hinde, Frank George (Corvallis) Subject: RE: Zenith-List: 801 on mo-gas --> Zenith-List message posted by: "Hinde, Frank George (Corvallis)" --> <frank.hinde@hp.com> Superior recommend retarding the ignition to 22 deg BFTC rather than 25....Apparently Mogas has a faster flame travel and the reduction in timing compensates for it. Frank However,if I'm hearing right, a few degrees of timing reduction would be recommended to prevent detonation? (though I did not read that in Frank's email from Dave Rogers at Superior). It sounds like Superior says mogas is no problem, but do they tune it differently? Superior is at the top of my list for an "experimental version" of an O-360 anyways. == direct advertising on the Matronics Forums. == == == == direct advertising on the Matronics Forums. == == ==


    Message 6


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    Time: 09:21:30 AM PST US
    From: "Gary Craze" <garycraze@hotmail.com>
    Subject: 801 on mo-gas
    --> Zenith-List message posted by: "Gary Craze" <garycraze@hotmail.com> That sounds like a good plan, since even 91+ octane mogas is still way cheaper than 100LL. And I bet we're talking about small performance changes between 22 degrees and 24/25 degrees on a 360. The GAMI system is on www.gami.com. Check out their products section for the PRISM system (Pressure Reactive Intelligent Spark Management). It was just recently announced and no price yet, but I'm guessing it's very pricey, and probably outweighs the cost savings you would ever realize from running mogas, even factored over many years of service. I rebuilt an EA-81 for a Nieuport replica I was building. Never ran 100LL in it, but I'm guessing that for the lower horsepower engines, it's probably a non-issue of low octance mogas versus 100LL. About the same with the 145hp O-300 in my old C-170. Just slapped the EAA STC sticker on it and filled it with whatever was available. Never noticed a difference. Rgds, Gary Craze Houston, TX N801GC (reserved) -----Original Message----- From: owner-zenith-list-server@matronics.com [mailto:owner-zenith-list-server@matronics.com] On Behalf Of Hinde, Frank George (Corvallis) Subject: RE: Zenith-List: 801 on mo-gas --> Zenith-List message posted by: "Hinde, Frank George (Corvallis)" --> <frank.hinde@hp.com> To be honest I don't think the 3 degrees will make that much difference. I intend to set mine to 22 degrees and fill it with watever I can find above 91 oct including 100LL. I wonder how the new auto ignition system senses the fuel octane and corresponding advance?...The way this is done in new auto's is by using a knock sensor...I.e the the timing is advanced until it just pre-ignites and then retards the ignition. Adding knock sensors in an after market situation I did not think was easy...I would want to see a number of these new systems working before I bought one. I can tell you in my little EA 81 soob using 100LL makes no detectable difference and I certainly don't go around adjusting the timing...:)...No "in a pinch" about it. Do you have a website for this new GAMI system?...I'll be purchasing an IO360 next year. Thanks Frank -----Original Message----- From: owner-zenith-list-server@matronics.com [mailto:owner-zenith-list-server@matronics.com] On Behalf Of Gary Craze Subject: RE: Zenith-List: 801 on mo-gas --> Zenith-List message posted by: "Gary Craze" <garycraze@hotmail.com> Thanks Frank. That pretty much corresponds with the other data I've got. So it sounds like that if a person really wants to insure proper detonation for the specific fuel they are using on the O-360, then one really needs to adjust the timing to reflect the fuel being used. I suppose you could swap fuels in a pinch without adjusting timing if you had too, and could (generally) probably expect no severe problems. But it sounds like the ultimate solution is an automatic ignition system like GAMI's new PRISM system which will automatically adjust the ignition based on the burn of the fuel being used, so you can swap between mogas and 100LL at whim. The vast majority of time I'm in a place with available 100LL. I did like the cost savings on my old C-170 when I was burning mogas, but a lot of time I had to pump it myself at the gas station and hand fill the plane from 5-gallon cans. It was pretty time consuming and semi-heavy lifting, and I often found myself just taxiing down to the self-serve 100LL pumps and filling it up and biting the cost bullet. But in the semi-distant future, I plan on flying the CH801 to a turf strip I'm building at our ranch outside of San Antonio, so I'd really only have mogas there (though I could easily hop over to a nearby field that does have 100LL and fill up...). Sounds like I'll plan on setting the tuning for 100LL. Many thanks again everyone! Gary Craze Houston, TX N801GC (reserved) -----Original Message----- From: owner-zenith-list-server@matronics.com [mailto:owner-zenith-list-server@matronics.com] On Behalf Of Hinde, Frank George (Corvallis) Subject: RE: Zenith-List: 801 on mo-gas --> Zenith-List message posted by: "Hinde, Frank George (Corvallis)" --> <frank.hinde@hp.com> Superior recommend retarding the ignition to 22 deg BFTC rather than 25....Apparently Mogas has a faster flame travel and the reduction in timing compensates for it. Frank However,if I'm hearing right, a few degrees of timing reduction would be recommended to prevent detonation? (though I did not read that in Frank's email from Dave Rogers at Superior). It sounds like Superior says mogas is no problem, but do they tune it differently? Superior is at the top of my list for an "experimental version" of an O-360 anyways. == direct advertising on the Matronics Forums. == == == == direct advertising on the Matronics Forums. == == == == direct advertising on the Matronics Forums. == == ==


    Message 7


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    Time: 09:40:58 AM PST US
    From: "The Keeners" <kim.forest@surewest.net>
    Subject: XL Nosewheel Shimmy (kim.forest@surewest.net)
    --> Zenith-List message posted by: "The Keeners" <kim.forest@surewest.net> Zenith Gurus: Is anyone aware of nosewheel shimmy problems on the XL? I'm still trying to decide if I should go with the tail dragger. Thank you. Forest K. N601FK (Reserved) Starter Kit Started


    Message 8


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    Time: 09:57:30 AM PST US
    Subject: 801 on mo-gas
    From: "Hinde, Frank George (Corvallis)" <frank.hinde@hp.com>
    --> Zenith-List message posted by: "Hinde, Frank George (Corvallis)" <frank.hinde@hp.com> Slightly off topic but I did just get a rsponse from Bart at Aerosport power (purveyors of Eci and Superior parts build 360's) He said that Superior actively endorse the use of 91 oct mogas in their experimental o360's whereas Eci kinda tolerates it. Read...If there is valve seat damage Superiors warranty will cover it (unless they can prove damage caused by fuel contamination) whereas ECI's will not. It may well be that the valve/seat material is exactly the same but the warranty effects could well be worth the extra $1100 for the superior engine....At 10 gallons an hour its about 110 hours of payback using Mogas. Might be a usefeul thought for anyone considering a Lycoming clone. Frank


    Message 9


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    Time: 12:30:50 PM PST US
    Subject: 801 on mo-gas
    From: "Hinde, Frank George (Corvallis)" <frank.hinde@hp.com>
    --> Zenith-List message posted by: "Hinde, Frank George (Corvallis)" <frank.hinde@hp.com> Correct, but I think it is a recommendation rather than an absolute must. Superior I do not believe does anything different to ECI but ECI seems to provide something of a "tailight warranty" when using Mogas. Like burnt valve seats+mogas=you pay for the rebuild. With Sduperior their warranty covers its use. Superior engiens are about $1100 more than ECI built engines. Now the next question is...The lightspeed ignition systems allow quite a bit more advance at certain engine operation....How does this stack up with Mogas? Frank -----Original Message----- From: owner-zenith-list-server@matronics.com [mailto:owner-zenith-list-server@matronics.com] On Behalf Of Hinde, Frank George (Corvallis) Subject: RE: Zenith-List: 801 on mo-gas --> Zenith-List message posted by: "Hinde, Frank George (Corvallis)" --> <frank.hinde@hp.com> Superior recommend retarding the ignition to 22 deg BFTC rather than 25....Apparently Mogas has a faster flame travel and the reduction in timing compensates for it. Frank However,if I'm hearing right, a few degrees of timing reduction would be recommended to prevent detonation? (though I did not read that in Frank's email from Dave Rogers at Superior). It sounds like Superior says mogas is no problem, but do they tune it differently? Superior is at the top of my list for an "experimental version" of an O-360 anyways. == direct advertising on the Matronics Forums. == == ==


    Message 10


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    Time: 12:44:26 PM PST US
    From: "Frank Jones" <fjones@sympatico.ca>
    Subject: RE:Exhaust fumes in cabin
    --> Zenith-List message posted by: "Frank Jones" <fjones@sympatico.ca> My CO problem is now resolved. As suspected it was due to leakage at the knuckle joints of the exhaust system. 1st, I greased each joint with anti-seize compound and tried it out. This may have reduced CO a bit but I still was getting readings. Next I wrapped each joint with a fiberglass cloth and placed aluminum tape over it. The ensure nothing came loose I added a hose clamp on either side of the gap - no more CO in the cabin. Thanks for everyone's help. Frank Jones - 601XL 912S


    Message 11


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    Time: 03:52:09 PM PST US
    From: "Brett " <brett@hog-air.com>
    Subject: Re: XL Nosewheel Shimmy (kim.forest@surewest.net)
    --> Zenith-List message posted by: "Brett " <brett@hog-air.com> I have never had mine shimmy. I have had a 152 do it to me sometimes though. > Zenith Gurus: > > Is anyone aware of nosewheel shimmy problems on the XL? > I'm still trying to decide if I should go with the tail dragger. > > Thank you. > Forest K. > N601FK (Reserved) > Starter Kit Started >do not arcive Thanks Brett Ray www.hog-air.com


    Message 12


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    Time: 05:22:28 PM PST US
    Subject: Re: XL Nosewheel Shimmy (kim.forest@surewest.net)
    From: Ray Montagne <ac6qj@earthlink.net>
    --> Zenith-List message posted by: Ray Montagne <ac6qj@earthlink.net> On 10/20/04 3:51 PM, "Brett" <brett@hog-air.com> wrote: > --> Zenith-List message posted by: "Brett " <brett@hog-air.com> > > I have never had mine shimmy. I have had a 152 do it to me sometimes > though. > > Haven't heard of a nose wheel shimmy but please be aware that a tail wheel can shimmy too! DO NOT ARCHIVE Best Regards, Ray Montagne Cupertino, CA =========================================================================== Zenith Aircraft Zodiac CH-601-XL Build Status: Rudder completed Elevator Completed Stabilizer Completed Flaps Completed Ailerons Completed Right Wing Completed Right Wing Tip Completed Left Wing Completed Right Wing Tip Completed Fuselage Under Construction NOTE: Heavy SPAM filters in place. Replies that do not include the word 'Zenith' or 'Zodiac' in the subject line will be rejected and will not be viewable by me. ===========================================================================


    Message 13


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    Time: 08:19:37 PM PST US
    Subject: 701 Wing Installation
    From: Jimmy Parker <jwestie1@juno.com>
    --> Zenith-List message posted by: Jimmy Parker <jwestie1@juno.com> I'm ready to mount my wings. Anybody have a "procedure"? I can't find a "how to" anywhere. Thanks, Jim 5098 701


    Message 14


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    Time: 09:20:56 PM PST US
    From: Benford2@aol.com
    Subject: Re: 801 on mo-gas
    --> Zenith-List message posted by: Benford2@aol.com In a message dated 10/20/2004 1:31:54 PM Mountain Daylight Time, frank.hinde@hp.com writes: > > Now the next question is...The lightspeed ignition systems allow quite a > bit more advance at certain engine operation....How does this stack up > with Mogas? > > Frank > > -----Original Message----- > I am willing to chime in on this topic and fill in the details on fuel specs and octane requirments. Aften a couple dozen years of building engines of all kinds including NASCAR, drag, offshore and sprint car motors. I also started and ran an engine R&D and dyno service I sold to Jasper Engines just before I moved here to Jackson Hole Wy. 1- The higher the octane number the slower the burn rate of the fuel. 100 LL blue is called 100-130. The true octane is about 108. The old green 100-130 had 2.5 times the lead in it and that helped is preventing detonation. If any of you older guys remember the purple stuff, that was 115-145 and was available at the bigger airports that had heavy piston transports operating out of them 2- Auto gas as sold in gas stations are hardly ever the octane the sticker on the pump says, It is an involved test to check for the true octane number and the stations know that so they often sell 87 and 89 disguised as 91. Don't assume that you are getting high octane fuel and always set your timing to a conservative advance setting. 3- One of the main reasons for 100LL high cost is because it is closely regulated and tested. This assures you that it will be consistant whereever you buy it at. Here in Jackson 100LL is very expensive with the main reason being we are a resort destination, this week it is over 4.10 a gallon. On my V-8 all aluminum Ford powered 801 I am running duel MSD ignitions. Ign # 1 is set at 33 degrees of total advance, Ign # 2 is set at 27 degrees. All it takes to switch between Mogas and 100LL is the flick of a dpdt toggle switch on my panel. Now keep in mind my plane is sitting in its hangar tonight at 6600 msl, if I was based down at sea level the timing should be retarded a couple of degrees for a safety measure. A 10.4-1 motor like mine is really a 8.6 -1 here at this elevation so timing can be advanced. The point I am making is tune your engine for your local area. 4- Vapor lock can be a real problem if your fuel supplier is not doing his homework. If he gets a load of winter blend gas and sells it during the hot summer months it will most likely vapor lock. This is another one of the tests that is pretty involved and he is betting no one is gonna call him on it.100LL is the same blend all year round. I buy my auto fuel a 1000 gallons at a time and I know my supplier personally so I have a very high confidence level with the quality of it. If you are trying to save the maximum amount of money and buy 91 octane at the cheapest place in your town you can almost bet that fuel will come back to haunt ya on take off, at 95 degrees in the summer on a short strip. Ben Haas N801BH do not archive


    Message 15


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    Time: 11:05:46 PM PST US
    From: "Brett " <brett@hog-air.com>
    Subject: Sebring FL
    --> Zenith-List message posted by: "Brett " <brett@hog-air.com> Is anyone going to Sebring next week? If so stop by I'll have the XL there with the Harley in it. I am planing on flying down Sat. or Sun. if the weather will give me a break. Thanks Brett Ray www.hog-air.com do not archive


    Message 16


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    Time: 11:29:06 PM PST US
    From: "Dirk Slabbert" <dirkslabbert@telkomsa.net>
    Subject: Re: 801 on mo-gas
    --> Zenith-List message posted by: "Dirk Slabbert" <dirkslabbert@telkomsa.net> Whoa Ben ! there you said it, right to the point ! Thanks for a very good explanation, could just keep some pilot out of harm's way. What is the solution for vapour lock then, if any ? temperature regularly goes to 100 here on my little strip. Regards, Dirk. ----- Original Message ----- From: Benford2@aol.com To: zenith-list@matronics.com Sent: Thursday, October 21, 2004 6:20 AM Subject: Re: Zenith-List: 801 on mo-gas --> Zenith-List message posted by: Benford2@aol.com In a message dated 10/20/2004 1:31:54 PM Mountain Daylight Time, frank.hinde@hp.com writes: > > Now the next question is...The lightspeed ignition systems allow quite a > bit more advance at certain engine operation....How does this stack up > with Mogas? > > Frank > > -----Original Message----- > I am willing to chime in on this topic and fill in the details on fuel specs and octane requirments. Aften a couple dozen years of building engines of all kinds including NASCAR, drag, offshore and sprint car motors. I also started and ran an engine R&D and dyno service I sold to Jasper Engines just before I moved here to Jackson Hole Wy. 1- The higher the octane number the slower the burn rate of the fuel. 100 LL blue is called 100-130. The true octane is about 108. The old green 100-130 had 2.5 times the lead in it and that helped is preventing detonation. If any of you older guys remember the purple stuff, that was 115-145 and was available at the bigger airports that had heavy piston transports operating out of them 2- Auto gas as sold in gas stations are hardly ever the octane the sticker on the pump says, It is an involved test to check for the true octane number and the stations know that so they often sell 87 and 89 disguised as 91. Don't assume that you are getting high octane fuel and always set your timing to a conservative advance setting. 3- One of the main reasons for 100LL high cost is because it is closely regulated and tested. This assures you that it will be consistant whereever you buy it at. Here in Jackson 100LL is very expensive with the main reason being we are a resort destination, this week it is over 4.10 a gallon. On my V-8 all aluminum Ford powered 801 I am running duel MSD ignitions. Ign # 1 is set at 33 degrees of total advance, Ign # 2 is set at 27 degrees. All it takes to switch between Mogas and 100LL is the flick of a dpdt toggle switch on my panel. Now keep in mind my plane is sitting in its hangar tonight at 6600 msl, if I was based down at sea level the timing should be retarded a couple of degrees for a safety measure. A 10.4-1 motor like mine is really a 8.6 -1 here at this elevation so timing can be advanced. The point I am making is tune your engine for your local area. 4- Vapor lock can be a real problem if your fuel supplier is not doing his homework. If he gets a load of winter blend gas and sells it during the hot summer months it will most likely vapor lock. This is another one of the tests that is pretty involved and he is betting no one is gonna call him on it.100LL is the same blend all year round. I buy my auto fuel a 1000 gallons at a time and I know my supplier personally so I have a very high confidence level with the quality of it. If you are trying to save the maximum amount of money and buy 91 octane at the cheapest place in your town you can almost bet that fuel will come back to haunt ya on take off, at 95 degrees in the summer on a short strip. Ben Haas N801BH do not archive




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