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From: "George Lendich" <lendich@optusnet.com.au>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
References: <list-3116780@logan.com>
Subject: Re: [FlyRotary] Re: New rotary engine-mazda points on design
Date: Sat, 6 Sep 2008 16:16:44 +1000
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 Ernest,
Very true mate,  to me high pressure in a cowl is my concern - paint me 
paranoid. If we could have low pressure injection I would be most 
appreciative, but sadly the carby is 'old hat' now. The Bendix type systems 
are about 30 psi - not too bad!
Are they really going to have ceramic coatings on the side housings?
George ( down under)

> George Lendich wrote:
>> Jim,
>> The biggest volume is at BDC- anything past this is compression, it's not 
>> getting high until it goes past the inlet area; but it certainly is quite 
>> high at the 12:00 O'clock position where the direct injection is taking 
>> place.
>> Direct Injection has to be high to atomize the fuel particles finely 
>> enough to get complete combustion. Of course it has to be high to also 
>> counter the compression pressure at this stage.
>> George ( down under)
> But, George, "high" is a relative term.  We run our fuel system on the 
> road anywhere from 30 to 60 psi.  That 60 seems awfully high;  but the 
> natural gas in the portable tank that I buy from the grocery store to fire 
> by BBQ grill comes with 300psi.  That's what it takes to make natural gas 
> a liquid at room temperatures.  And that crazy guy, T. Boon Pickens, is 
> trying to convince us Americans to run our cars on that same natural gas 
> (actually, many are doing it already).  At a 10:1 compression ratio, 
> ambient pressure is driven to 147 psi.  You still only need 60 above that 
> to get the good atomization.  Yet, you can buy tanks from the GROCERY 
> STORE compressed to 300.
>
> Granted, the BBQ grill doesn't get the same sort of vibrations as a car 
> (unless I've got the burgers REALLY flying), but that is just a matter of 
> engineering the connectors to handle the stress.  Simple engineering that 
> has been done a gazillion times before (see diesel engine).  I'm not 
> saying they don't have some engineering and testing to do.  I'm just 
> saying that they're not having to blaze new trails into unknown territory. 
> This seems to me to be very much a small evolutionary step, and not a 
> major revolutionary one.
>
> -- 
>
> http://www.ernest.isa-geek.org
>
>
>
> --
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