REFLECTOR: Auto engine installed 172

Thu Nov 11 20:08:20 CST 2010

Best BSFC is going to be found at the torque peak.
Accessories that require power are all going to eat away at that value, 
and fuel injection is better than a carburetor.  So best BSFC would be 
at WOT, naturally aspirated.

I suppose the large cylinder part doesn't matter.  As long as you 
minimize pumping losses, you could get good BSFC.
The above parameters for airplanes imply large cylinders.

Slow RPM's minimize air pumping losses, and other friction losses.

On 11/11/2010 11:25 AM, Scott Derrick wrote:
> Brian,
>
>     Why does large cylinder, slow RPM make for a better BSFC?  The 
> slow rpm makes a bit of sense because you have more time to burn...
>
> Scott
>
> -------- Original Message --------
> Subject: Re: REFLECTOR: Auto engine installed 172
> From: Brian Michalk <michalk at awpi.com>
> To: Velocity Aircraft Owners and Builders list <reflector at tvbf.org>
> Date: 11/11/2010 09:54 AM
>>   I have not been able to find a solid number, from what I can tell 
>> on the net, the LS3 engine runs at a best BSFC of around .45.
>>
>> I believe most aircraft engines run in the .36 to .40 range.
>>
>> The website claims 2x better, when the LS3 is not even as efficient.
>>
>> I like auto engines and everything, but their smaller cylinders and 
>> higher RPM's are going to make it extremely difficult to get better 
>> BSFC numbers than large bore, slow RPM engines.
>>
>> On 11/11/2010 10:35 AM, Andy Millin wrote:
>>>
>>> Hey Bob,
>>>
>>> I didn't write that very well.  I did not think you were associated 
>>> with him or were doing any marketing for him.  It was referring to 
>>> what he had written on his page.
>>>
>>> Andy
>>>
>>> *From:*reflector-bounces at tvbf.org 
>>> [mailto:reflector-bounces at tvbf.org] *On Behalf Of *Bob Jackson (Jax 
>>> Tech)
>>> *Sent:* 11-10-2010 7:18
>>> *To:* 'Velocity Aircraft Owners and Builders list'
>>> *Subject:* Re: REFLECTOR: Auto engine installed 172
>>>
>>> Hello Andy,
>>>
>>> The thing is that most private pilots don't run LOP or use an 
>>> electronic ignition, so an auto conversion has a natural advantage 
>>> over standard issue aircraft engines in that regard.  I agree that 
>>> many of us are milking about everything we can out of aircraft 
>>> engines, and that aircraft engines can be extremely efficient and 
>>> durable.  The primary auto technology that is still hard to benefit 
>>> from on the aircraft side -- I know of no one offering one, 
>>> especially to homebuilders -- is electronic ignition.
>>>
>>> But -- I didn't mean to imply that I had ANY business or marketing 
>>> connection with Mr. Aden.  I actually know very little about what he 
>>> has, how it operates, or what his STC plans are.  I like my 
>>> TNIO-550N!   I certainly have no marketing involvement -- I was 
>>> simply saying that Al is an interesting and talented guy who happens 
>>> to be near by.
>>>
>>> Maybe I did Al (and the Reflector) a dis-service by saying anything 
>>> at all.  Al, I'm sure, has no idea it's even been posted on our 
>>> discussion board.  I don't want to discourage anyone posting their 
>>> thoughts, comments, criticisms or suggestions on his auto conversion 
>>> ideas.  It's always helpful to anyone who's developing new stuff to 
>>> hear the ideas, concerns and issues of other homebuilders.  What a 
>>> service the Reflector provides to us in that regard!
>>>
>>> Bob
>>>
>>> ------------------------------------------------------------------------
>>>
>>> *From:*reflector-bounces at tvbf.org 
>>> [mailto:reflector-bounces at tvbf.org] *On Behalf Of *Andy Millin
>>> *Sent:* Wednesday, November 10, 2010 9:46 AM
>>> *To:* 'Velocity Aircraft Owners and Builders list'
>>> *Subject:* Re: REFLECTOR: Auto engine installed 172
>>>
>>> Hey Bob,
>>>
>>> I'm sure he is a nice guy and he is doing good work.  I am leery of 
>>> anyone that claims their engine will use half the fuel.  I have yet 
>>> to see an auto conversion that has a better BSFC than an aircraft 
>>> engine.  Especially when an electronic ignition is added and an EIS 
>>> is used to run LOP.
>>>
>>> I know you have to toot your own horn for marketing, but...  it 
>>> would be nice to see a new engine developer under promise and over 
>>> deliver (or just deliver).
>>>
>>> I do wish him the best of luck.
>>>
>>> Andy
>>>
>>> *From:*reflector-bounces at tvbf.org 
>>> [mailto:reflector-bounces at tvbf.org] *On Behalf Of *Bob Jackson
>>> *Sent:* 11-09-2010 9:01
>>> *To:* 'Velocity'; 'Velocity Aircraft Owners and Builders list'
>>> *Subject:* Re: REFLECTOR: Auto engine installed 172
>>>
>>> Al Aden and his Quiet Aviation company are located at the Orlando 
>>> Apopka airport, just a few hangars away from us.  Al's a good guy, 
>>> knows what he's doing, and I believe he will have his STC approved 
>>> for this engine on C172's by next summer.
>>>
>>> Bob Jackson
>>>
>>> N2XF
>>>
>>> Orlando Apopka Airport (X04)
>>>
>>> ------------------------------------------------------------------------
>>>
>>> *From:*reflector-bounces at tvbf.org 
>>> [mailto:reflector-bounces at tvbf.org] *On Behalf Of *Velocity
>>> *Sent:* Tuesday, November 09, 2010 5:23 PM
>>> *To:* Velocity Aircraft Owners and Builders list
>>> *Subject:* REFLECTOR: Auto engine installed 172
>>>
>>> http://www.quietaviation.com/
>>>
>>>
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>>
>>
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>
> -- 
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> J. R. R. Tolkien
>
>
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