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  #16  
Old 02-13-2006, 09:52 PM
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Must be the plasma thing mpafleur has been talkin about. keepin the engine on the edge

45% - hard to believe - wait to see
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  #17  
Old 02-13-2006, 10:19 PM
Marc Zeitlin Marc Zeitlin is offline
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Quote:
Originally Posted by levansic
I've heard a rumor that I'm having a hard time believing.
You should be.
Quote:
Originally Posted by levansic
... the new injection systems will provide near 45% more power for the same amount of fuel or the same amount of power using 45% less fuel.
If we assume that we're talking about a diesel engine that is what, about 30% efficient at it's best, that would imply that by doing nothing other than modifying the injectors, they can increase the efficiency to 44%. I'm skeptical, too.

10% - 20% - maybe. 45% increase? I dunno.

From:

http://www.bath.ac.uk/~ccsshb/12cyl/

The BEST diesel in the world (and it's HUGE), is about 50% efficient, and from:

http://hyperphysics.phy-astr.gsu.edu...mo/diesel.html

A "normal" diesel has a THEORETICAL maximum efficiency of about 56%.

Personally, I think it would take a LOT more than just a change of injectors (much higher compression ratio, much higher temperatures, etc.) to get the efficiency up that high.

But hey - I'm no engine expert, and I'd love to be proved wrong.
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  #18  
Old 02-13-2006, 11:58 PM
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BMW and Toyota are about to introduce direct injection for gasoline engines. Data I've read said something like an 8% economy gain over port injection and possible gains in power of around the same amount due to the higher CRs possible. The thermal efficiency of an engine is tied to a large degree by the CR. It's unlikely than even a turbo compounded, high compresssion Otto cycle engine could ever exceed 35-40%.

Power is a direct function of the mass of fuel/ air mixture reacted per unit time. While modern technologies like direct injection can allow very lean mixtures to be ignited and lead to possible efficiency gains at part throttle, the first law here cannot be changed. Power output falls off quickly as the AFR goes leaner than about 15 to 1. Air does not react without fuel.

I'll have to see this to believe it. The Diesel will be dead if this is true. Throttle plates, valve springs, camshafts and port type injectors may all be history in 10 years on new gasoline engines though.
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  #19  
Old 02-14-2006, 03:04 AM
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Kumaros Kumaros is offline
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Quote:
Originally Posted by levansic
I've heard a rumor that I'm having a hard time believing. A student that works in my lab now, had a co-op with Bosch, and was telling me about a major retooling that they are going to undertake this year for a big technology change-over that will be industry-wide in 2007. Bosch supplies injectors to near 80% of the auto industry now, so they're probably the the impetus for the industry-wide change.

Anyway, what he was saying about this change-over is that the new injection systems will provide near 45% more power for the same amount of fuel or the same amount of power using 45% less fuel. This fuel consumption reduction seems unbelievable to me right now, but with the advances in direct-injection gasoline engines (e.g. VW/Audi FSI), maybe there is something to this rumor. Time will tell.

I'll worry about this when I finish my airframe.

-- Len
He was probably talking about a wholesale conversion from solenoid activated injectors to piezoelectric ones with their concomitant advantages: higher injection pressures = finer atomization of fuel, shorter response times = multiple injections per combustion event. More power yes, better efficiency yes, 50% improvement I doubt it, more like 15%, if that. Nippon Denso, used by Japanese manufacturers, are closely following too. All these new technologies, however, depend on clean, sulphur-free diesel, absent until now in the US, about to be mandated by EPA regulations in late 2006.
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  #20  
Old 03-22-2007, 12:44 PM
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Has anyone ever seen a v-8 in a LongEZ? Apparently there was one at the contact magazine alternative engine roundup last year...

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  #21  
Old 03-22-2007, 01:22 PM
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shouda had a V8
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  #22  
Old 03-22-2007, 07:32 PM
deuskid deuskid is offline
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Default Diesel in a LongEZ

posted today:

LongEZ w/ a diesel

This is a clip from Bill Allen in Europe who has installed a diesel in his second Long EZ:

http://www.youtube.com/watch?v=vynMdbHvGxQ


Originally posted in a DeltaHawk thread on VAF forum

SWEET!

John
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  #23  
Old 03-22-2007, 09:58 PM
Lynn Erickson Lynn Erickson is offline
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Quote:
Originally Posted by Wapati8 View Post
Has anyone ever seen a v-8 in a LongEZ? Apparently there was one at the contact magazine alternative engine roundup last year...

It belongs to Gary and Char Spencer
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  #24  
Old 03-22-2007, 10:19 PM
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(you will only get this if you are really old)

Shouldn't there be a big gear shifter sticking out through the top of the canopy?
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  #25  
Old 03-22-2007, 11:00 PM
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o dam, i was hopeing i didnt get that one
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  #26  
Old 03-22-2007, 11:11 PM
Kraig Kraig is offline
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Quote:
Originally Posted by Cozy Girrrl View Post
(you will only get this if you are really old)

Shouldn't there be a big gear shifter sticking out through the top of the canopy?
Would that make it a "Rat Fink-EZ"!

That should date me, huh?

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  #27  
Old 03-23-2007, 01:32 AM
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Quote:
Originally Posted by Kraig View Post
Would that make it a "Rat Fink-EZ"!

That should date me, huh?

Kraig
That would be the "Big Daddy Roth" cat-eze. Hurst 8 ball through the roof and a healthy dosage of Visine needed by the pilot!
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  #28  
Old 03-23-2007, 08:16 AM
deuskid deuskid is offline
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Quote:
Originally Posted by Cozy Girrrl View Post
(you will only get this if you are really old)

Shouldn't there be a big gear shifter sticking out through the top of the canopy?
You must have listened attentively when you mom would speak of her younger years....

[my older brother had a deuce with a 327 and a hurst 3 on the floor... [among other monsters]... neighbor had a 57 with same engine/tranny combo].... VARooommmmmm.....

I tend [and tended] to lean to the more elegant side [2 seat roadsters]... <lean in, wide eyes and whispers>... Zoom -- Zoom

John
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  #29  
Old 03-23-2007, 09:33 AM
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Quote:
(you will only get this if you are really old)
Cr*p .... I'm old
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  #30  
Old 03-23-2007, 10:16 AM
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Quote:
Originally Posted by Cozy Girrrl View Post
(you will only get this if you are really old)

Shouldn't there be a big gear shifter sticking out through the top of the canopy?
Ed “Big Daddy” Roth died in 2001, but his works live on to remind us of an important period of social change, and inspire those who seek to embrace their own spirit of nonconformity.
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