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 Post subject: Hardened Valve seats
PostPosted: Fri Jul 31, 2009 10:18 am 
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Most GA piston pounders have had hardened seats from the getgo as a necessity due to Aluminum castings for Cylinder heads.

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PostPosted: Fri Jul 31, 2009 1:10 pm 
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You know, there were these very same conclusions in the heavy piston ranks way back (before internet - gulp!) when they stopped making 115/130 commonly available. I think that was in late the 1980's ? Operators feared that the heavy pistons would stop running. But, I guess that did not happen. The engine shops say that as long as petroleum is a source of fuel, the big motors could keep running. Some motor adjustments would need to be made, of course.
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PostPosted: Fri Jul 31, 2009 1:46 pm 
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My recollection is that the problems with valve recession that were encountered with auto engines tended to be encountered with engines that were in stationary service and operating very long duty cycles. This doesn't have that much relevance to how auto engines normally operate in cars. Hopefully the valve recession issue will not be a big issue in aircraft engines either. The reduced octane will have to be dealt with by adjusting the tuning/compression, but for most preserved aircraft that shouldn't be a big problem.

Apparently, it's still possible to get racing fuels containing TEL for non-highway use in racing cars. It may be that avgas containing TEL will still be available (at a higher price, of course) for aircraft that specifically require it.

Martin


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PostPosted: Fri Jul 31, 2009 2:33 pm 
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There are some biofuels alternatives being looked at/tested by major oil companies that currently produce 100LL.

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 Post subject:
PostPosted: Fri Jul 31, 2009 6:13 pm 
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This looks very promising as a direct replacement for 100LL, Aero-News and AvWeb did articles last year.

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West Lafayette, Indiana, June 17, 2008 , Swift Enterprises Ltd. has unveiled a new general aviation fuel that is less expensive, fuel-efficient and environmentally friendlier than any on the market, said co-founder John Rusek.

The general aviation industry includes all flights other than military and scheduled airline flights, both private and commercial.Data on Swift Enterprises' 100 percent renewable general aviation fuel was presented April 28 at an annual meeting of an international committee that oversees aviation fuel standards.

Unlike current biomass fuels, SwiftFuel© is comprised of synthetic hydrocarbons derived from biomass.Rusek said it can provide an effective range (distance between refueling) greater than petroleum while its projected cost is half the current petroleum manufacturing cost.

The innovation by Swift Enterprises' propulsion and energy researchers meets or exceeds the standards for aviation fuel as verified by nationally recognized laboratories, added Rusek, a professor in Purdue University's School of Astronautics and Aeronautics Engineering.

Swift Enterprises, founded seven years ago at Purdue Research Park, is led by Rusek and his wife, Mary, who have been involved in the field of energy more than two decades.
...
"Our fuel should not be confused with first-generation bio-fuels like E-85, which don't compete well right now with petroleum," Rusek said."For general aviation aircraft, range is paramount.Not only can our fuel seamlessly replace the aviation industry's standard petroleum fuel, it can outperform it."

Each year, the general aviation industry uses nearly 570 million gallons of 100LL aviation fuel, which is toxic, increasingly expensive and non-renewable.In contrast, testing has shown SwiftFuel© is 15 to 20 percent more fuel efficient, has no sulfur emissions, requires no stabilizers, has a 30-degree lower freezing point, introduces no new carbon emissions, and is lead-free, Rusek said.

In addition, components of this fuel can be formulated into a replacement for jet/turbine fuels.
...
"John and Mary Rusek have devoted their lives to coming up with practical, renewable energy," said Joseph B. Hornett, senior vice president, treasurer and chief operating officer of the Purdue Research Foundation, which manages the Purdue Research Park.

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PostPosted: Fri Jul 31, 2009 6:29 pm 
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I wouldn't be that alarmed by it. Unleaded autogas can be used in most airplanes. However, the EPA is dangerous. They have no congressional oversight, and are run by a so called Czar appointed by the president. The reason this is the problem, is the fact that the president in recent times has acted unconstitionally regardless of what congress says.

In an extreme case theoretically, the EPA Czar can ban all fossil fuel at the president's request, and nobody would be able to stop it. Dangerous times we're living in.

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PostPosted: Fri Jul 31, 2009 6:35 pm 
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I wouldn't worry too much about a total ban. Even China isn't that far, and before that there'd be a revolt between the users and the producers.

Ryan

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PostPosted: Fri Jul 31, 2009 6:40 pm 
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I wouldn't worry too much about a total ban. Even China isn't that far, and before that there'd be a revolt between the users and the producers.

Ryan


Good point, but was trying to make everyone aware of the unconstitutional position the EPA is now in.

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PostPosted: Fri Jul 31, 2009 6:46 pm 
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Constitution,...hmmm, I think I remember that. Isn't that an old piece of paper written by those old guys 200 + years ago ? Didn't the Govt use to use it as a document to govern the people until some of them started calling it a "living document subject to interpretation "? :roll:

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PostPosted: Fri Jul 31, 2009 7:06 pm 
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Quote:
Good point, but was trying to make everyone aware of the unconstitutional position the EPA is now in.


Actually, the Constitution, if I recall correctly prohibits the Feds from doing ANYTHING not specifically given to them by the states. The reason I acknowledge the FAA's rules is because Texas has incorporated them into Texas Law...
There are a LOT of agencies that fall under that.

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 Post subject:
PostPosted: Fri Jul 31, 2009 7:34 pm 
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Actually, the Constitution, if I recall correctly prohibits the Feds from doing ANYTHING not specifically given to them by the states. The reason I acknowledge the FAA's rules is because Texas has incorporated them into Texas Law...
There are a LOT of agencies that fall under that.


It does, but the power of the Czars puts the whole thing at a more extreme level which opens the door to dictatorship.

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 Post subject:
PostPosted: Fri Jul 31, 2009 7:40 pm 
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A2C wrote:
Quote:
I wouldn't worry too much about a total ban. Even China isn't that far, and before that there'd be a revolt between the users and the producers.

Ryan


Good point, but was trying to make everyone aware of the unconstitutional position the EPA is now in.


You mean that piece of paper conservatives have been wiping their asses with for the last 200 years?

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 Post subject:
PostPosted: Fri Jul 31, 2009 9:51 pm 
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muddyboots wrote:
A2C wrote:
Quote:
I wouldn't worry too much about a total ban. Even China isn't that far, and before that there'd be a revolt between the users and the producers.

Ryan


Good point, but was trying to make everyone aware of the unconstitutional position the EPA is now in.


You mean that piece of paper conservatives have been wiping their asses with for the last 200 years?


Hoo Boy; here we go... :cry: :x

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 Post subject:
PostPosted: Fri Jul 31, 2009 10:23 pm 
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I just figured I'd get a lick in before it all got deleted :P

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 Post subject:
PostPosted: Fri Jul 31, 2009 11:08 pm 
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Voodoo wrote:
My recollection is that the problems with valve recession that were encountered with auto engines tended to be encountered with engines that were in stationary service and operating very long duty cycles. This doesn't have that much relevance to how auto engines normally operate in cars. Hopefully the valve recession issue will not be a big issue in aircraft engines either.
I had an MGB/GT with a cast iron head that had terrible valve seat recession. The hardened seats in aircraft engines should not encounter that problem. What might end up being the problem is accelerated valve guide wear.


Last edited by bdk on Fri Jul 31, 2009 11:37 pm, edited 1 time in total.

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