REFLECTOR: Auto engine installed 172

Thu Nov 11 19:55:40 CST 2010

Wikipedia says the Prius THS II engine is 37% efficient.
The Volkswagen 3.3L TDI engine is 41.1% efficient which they are showing 
as a SFC of .33, which is a little better than my Franklin.

So, that Prius engine is pretty small and doesn't get better than the 
TDI engine.  Why didn't they use a TDI engine instead?

My guess is weight, and power requirements.

On 11/11/2010 04:06 PM, Scott Derrick wrote:
> I don't know.....
>
> These new small cylinder high rpm car engines are extremely 
> efficient.  Amazing mileage.
>
> Why aren't they running single or two cylinder large bore engines 
> instead of small bore 4 and 6 cylinder, if bigger was more efficient?
>
> Scott
>
> -------- Original Message --------
> Subject: Re: REFLECTOR: Auto engine installed 172
> From: Andy Millin <amillin at sbcglobal.net>
> To: 'Velocity Aircraft Owners and Builders list' <reflector at tvbf.org>
> Date: 11/11/2010 02:01 PM
>>
>> The faster you turn something the more energy it eats.  I think it is 
>> one of those it takes 4x the energy to spin it 2x faster things...
>>
>> More RPM -- more power, but you sacrifice efficiency as the RPM climbs.
>>
>> Andy
>>
>> *From:*reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] 
>> *On Behalf Of *Scott Derrick
>> *Sent:* 11-11-2010 12:26
>> *To:* Velocity Aircraft Owners and Builders list
>> *Subject:* Re: REFLECTOR: Auto engine installed 172
>>
>> 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> <mailto:michalk at awpi.com>
>> To: Velocity Aircraft Owners and Builders list <reflector at tvbf.org> 
>> <mailto: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> 
>> [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> 
>> [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> 
>> [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> 
>> [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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