Fuel injection plugs

[Raymond C Drouillard]

On Fri, 30 Apr 1999 10:42:39 +0200 "Espen Hilde" <mwichstr at online.no>
writes:
>Hi!
>I agree with using a variable transmition to keep the rpm at max torque
but
>we have to have a variable size engine to, to get max torque we have to
>have wot.if we drive at wot the output will be to high for our use.

If you change the ratio of the transmission enough to get the RPMs down
in the 1000 and under range, you can lower the power output drastically. 
The main caveat is to design the cam profile so that the engine will run
efficiently at that speed.  You don't need variable displacement or
variable compression ratio to do this.  Variable valve timing will do the
trick - and the technology is already fairly commonplace.


>Variable stroke is a help but it will be a ineffichent combustion camber
with
>the short stroke and the compression ratio will not be good still
runningwot.
>VW made a variable compression ratio combustion camber, dont ask me how
>they did it.....variable combustion camber and variable stroke would 
>do the trick .....easy uh....Ore several independant engines coupled
>together
>Espen   
>
>----------
>> From: James Ballenger <jballeng at vt.edu>
>> To: diy_efi at efi332.eng.ohio-state.edu
>> Subject: Re: Fuel injection plugs
>> Date: 30. april 1999 04:47
>> 
>> 
>> 
>> Howard Wilkinson wrote:
>> 
>> >     The most reasonable way to control engine power output is by
>> > gearing so that RPM is controlled by load.  A continuously 
>variable
>> > transmission system could allow an engine to operate at full 
>throttle
>> > all the time except at idle when it would need to be throttled.
>> > Allowing the engine to always operate at WOT would greatly 
>increase
>> > efficiency.           H.W.
>> 
>>     Ok, I know this isnt right.  If we had continously variable
>transmissions,
>> we would be running them at peak torque not at wot.  VE is greatest 
>at
>peak
>> torque, the reason we rev engines higher to acheive high horsepower 
>is to
>combat
>> inefficient gearing.  At wot, there is significantly reduced ve and 
>not
>enough
>> time to get good mixture and combustion, therefore lower torque.  
>The
>reason
>> this is an asset is because it produces more torque per unit time, 
>ie
>power.
>> With a continuously variable transmission we could run the engine 
>all day
>long
>> at peak torque and get double or triple the gas mileage, more power, 
>and
>reduced
>> wear.  Again, im just a student so tell me where i goofed but I have
>discussed
>> this with others before and feel somehat confident that this is 
>right.
>> 
>> James Ballenger

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