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Mike Welch
Joined: 13 Feb 2011
Posts: 272
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 Posted: Thu Jul 07, 2011 2:36 pm Post subject: ELT antenna placement |
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Thom,
I forgot to answer the fuel injection part of your question. As you know,
virtually every car sold anymore has fuel injection. The GEO Metro in 1997
(my engine) had the "throttle body" fuel injection. The unit looks, for
the most part, like a carburetor...but it's not a carb.
Since throttle body fuel injection has an operating pressure of around 35-45psi
in the GEO, I don't want to risk not having the appropriate fuel line. I have the
"non-fuel injection" fuel line installed, from having the engine running years ago,
long before the turbo installation. Non-fuel injection line has to go!!
Our buddy Bob Bean also has the GEO engine, but I think he has an older model.
I think the Chevy Sprint's had carburetors initially, and made the switch to fuel injection at
some point, but I don't know exactly when.
The GEO 1.0 liter 3 cylinder with a carburetor was rated at 55 HP (at)3800 rpm. The later
versions that came with F/I were upgraded to 62 HP (at)3800 rpm.
According to the guy that owns the machine shop who builds high performance Suzuki
engines, who also "reground" my camshaft to have a better performance curve to match
the turbo, says he thinks my engine (as it is now) should be somewhere around the
90-100 HP range, and maybe 110-120 ftlbs or torque (at) 4100. My turbo will be limited
to no more than 8 psi boost.
Mike Welch
[quote]
[b]
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Thom Riddle
Joined: 10 Jan 2006
Posts: 1597
Location: Buffalo, NY, USA (9G0)
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| Posted: Thu Jul 07, 2011 2:57 pm Post subject: ELT antenna placement |
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Thanks for the update, Mike. I now remember the Geo. BB's Geo is pretty quiet. Yours may have a bit more roar but also more performance. BB has a lot of first hand experience with the Geo and the Raven.
Thom
(sent from iPhone 4)
On Jul 7, 2011, at 6:34 PM, Mike Welch <mdnanwelch7(at)hotmail.com (mdnanwelch7(at)hotmail.com)> wrote:
[quote] Thom,
I forgot to answer the fuel injection part of your question. As you know,
virtually every car sold anymore has fuel injection. The GEO Metro in 1997
(my engine) had the "throttle body" fuel injection. The unit looks, for
the most part, like a carburetor...but it's not a carb.
Since throttle body fuel injection has an operating pressure of around 35-45psi
in the GEO, I don't want to risk not having the appropriate fuel line. I have the
"non-fuel injection" fuel line installed, from having the engine running years ago,
long before the turbo installation. Non-fuel injection line has to go!!
Our buddy Bob Bean also has the GEO engine, but I think he has an older model.
I think the Chevy Sprint's had carburetors initially, and made the switch to fuel injection at
some point, but I don't know exactly when.
The GEO 1.0 liter 3 cylinder with a carburetor was rated at 55 HP (at)3800 rpm. The later
versions that came with F/I were upgraded to 62 HP (at)3800 rpm.
According to the guy that owns the machine shop who builds high performance Suzuki
engines, who also "reground" my camshaft to have a better performance curve to match
the turbo, says he thinks my engine (as it is now) should be somewhere around the
90-100 HP range, and maybe 110-120 ftlbs or torque (at) 4100. My turbo will be limited
to no more than 8 psi boost.
Mike Welch
[b]
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_________________
Thom Riddle
Buffalo, NY (9G0)
Don't worry about old age... it doesn't last very long.
- Anonymous |
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Mike Welch
Joined: 13 Feb 2011
Posts: 272
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| Posted: Thu Jul 07, 2011 4:33 pm Post subject: ELT antenna placement |
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>Thanks for the update, Mike. I now remember the Geo. BB's Geo is pretty quiet. Yours may have a bit more roar but also more >performance. BB has a lot of first hand experience with the Geo and the Raven.
Thom,
I've got a lot of experience with the GEO and Raven Redrives, too, the problem is
it's all on my driveway or in my shop!  (I've had this darn engine since Jan 1999,
I bought the engine from a wrecking yard that only deals with GEO's (Sacramento).
The motor was in a 1997 Metro sedan, with 28,000 miles on the odometer. The car
was in a roll-over accident. Didn't affect the motor a bit! I know because I examined
the car real good, with the runnable motor in it!. I waited in their lobby while they
pulled the motor and wiring harness. Cost was $600. The engine started right up,
ran smooth as a spinning top...looked brand new when I first got it!)
Generally, a turbo engine is usually much quieter than a non-turbo engine. Having
to spin that little impeller really takes the sound out of the exhaust noise, as a rule.
My exhaust muffler consists of fairly small "glasspack" type muffler. I can't
remember exactly what it was intended for, but it could make a great GEO Metro
car replacement muffler. But, since I am not using it in a car, I wanted to cut it
down quite a bit, to reduce the weight some. Fortunately, the top was pop riveted
on, so all I had to do was drill out the pop rivets, remove the one end, cut it down
by about a half, and reinsert the top. I would be willing to bet my turbo/glasspack
exhaust system is surprisingly quiet! Hopefully in a few days I'll be able to find out!!
Here's a picture of my engine/turbo/exhaust that I took last year. Since this photo was
taken, I have "buttoned up" a lot of loose ends. In other words...this is a photo of a
'work in progress'!
Some details about the engine; the remote oil filter is the orange thing by the muffler.
The silver thing that the blue hose things attach to is the intercooler (the 'air' radiator
that takes the heat out of the compressed turbo air). The oil cooler and radiator
are mounted out in front of the motor (duh). The red hose from the turbo is the oil
drain line, that gravity feeds excess oil to the remote oil tank for the motor.
There. More info than you needed.
Mike Welch
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kuffel(at)cyberport.net
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| Posted: Thu Jul 07, 2011 9:20 pm Post subject: ELT antenna placement |
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Mike,
<< asking if the SPOT had an activation device...like an accelerometer...you don't really need an activation device, since the SPOT is broadcasting your location every 10 minutes >>
Don't misunderstand me. SPOT is a definite step forward. But it doesn't come close to replacing the functionality of the current GPS enabled 406MHz ELTs.
| Quote: | Have never seen a SPOT with automatic crash turn on. This would require hard mounting to the aircraft structure. Others on the list can confirm, as I know from personal experience, when a crash happens you are unlikely to have the spare time to find and press the SPOT 911 button before impact.
How far do you fly in 10 minutes? While Kolbs are "better" in this area, most homebuilts have their location determined only to within 1200 square miles or so under this condition. The 406 will use the last location received from the GPS, usually no more than 1/2 second before impact. And the area of uncertainty is measured in square yards.
The annual subscription for SPOT service gives me heartburn. Particularly since the 406MHz service is available at zero incremental cost (and my taxes pay for it whether I use it or not).
Your home or other designated computer might not be attended, particularly when most needed says Murphy.
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Agree the record for ELTs finding serious crashes is dismal. Some of this was from the limitations of the 121.5 system but most is due to unsuitable antenna location, i.e. anywhere external. The current GPS/406MHz system overcomes the problems with the old system and has an alert time, with your location, measured in seconds. (Response time is another issue.) And you, as the builder, have total control over your antenna location.
We all carry some sort of GPS now. Even the most basic can output the NEMA data to feed the 406 ELT. And such ELTs are now available for under $600. So it is clear to me any new construction should include a GPS enabled 406MHz ELT even if the added expense means you delay buying a SPOT for a year or two. (And in a year or two the SPOT technology is guaranteed to be better/cheaper.)
There is a better system than SPOT if you are willing to trade time for money (except for the wildest of wilderness areas and I'll bet Larry's Rock House, OR isn't one of them). Go to ARRL.org and find your local ham radio club. Most have classes several times a year. Ours has you ready to pass the test at the end of the second day and there is no longer any requirement to learn Morse Code. With your license install an APRS system (see Chuck Deiterich's article in May 2011 Kitplanes for details). His is set up to report position every 90 seconds or 30 degrees of heading change. And you gain a hobby every bit as enjoyable as aircraft homebuilding.
Tom
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