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> Ken, are the Ford injectors interchangeable with the stock Mazda
> injectors as far as size, plug and so on? If so, do you have a part
> number? BTW sorry but there is no way you can run a p port at 7500
> rpm and only get 225 hp. Can you accept 240? Jerry
>
>
>
>
>
> On Tuesday, March 22, 2005, at 03:48 PM, kenpowell@comcast.net wrote:
>
>
> But this graph was for a carburated engine so it really
> proves nothing. Besides, the engine only needs to be as rich as we
> want to run - you can't hurt the engine by running lean (I know, if
> you run it into the trees on a 100 F. day that will HURT it!!!). I
> have not seen any graphs showing power improvement beyond 0.6 on a NA
> engine and with very little to be gained by going beyond .55. If
> anyone can educate me differently please do so (no kidding, I'm trying
> to learn). I'm planning on using 42 lb Ford injectors for my P-Port
> motor, if this isn't enough I want to know (planning on 225 HP at 7500
> RPM).
>
> Ken Powell
>
> Bryant, Arkansas
>
> 501-847-4721
>
>
>
>
> -------------- Original message --------------
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> Arial0000,0000,8080Rus
> ty,
>
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> Arial0000,0000,8080Are
> you sure youíre allowing yourself enough margin on the top end by
> using .55 bsfc. This chart (snitched from the other list) indicates
> that .55 is about right up to around 7500, but at 8000 rpm bsfc will
> be up around .60. What does that do to your hp numbers?
>
>
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> Arial0000,0000,8080Mar
> k
> S.
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> From:Rotary motors in
> aircraft [mailto:flyrotary@lancaironline.net] On Behalf
> OfRussell Duffy
>
> Sent: Tuesday, March 22, 2005 2:25 PM
>
> To: Rotary motors in aircraft
>
> Subject: [FlyRotary] Re: fuel injector size, and redrive
> losses
>
>
> Times New Roman
>
>
> Times New RomanRC Engineering's calcs show
> that you are good to 302 HP at 43 psi fuel pressure, .50 BSFC, and
> 100% duty cycle. Of course you can't run the injectors at 100%
> (except maybe briefly like a drag race, not applicable to aircraft).
> So at 80% duty cycle the 38 lb injectors should be good for 242 HP.
> Enjoy your idle!!! Your injectors are big enough unless you P-Port
> and turn at least 8000 RPM.
>
>
>
> ArialFFFF,0000,0000Hi
> Ken,
>
>
> Times New Roman
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> ArialFFFF,0000,0000RC
> Engineering's calc shows the same as the fuel calculator that I
> posted the other day. Four 38 lb/hr injectors, at 80% duty cycle, .55
> BSFC, should be good for about 220 HP at the flywheel. I imagine that
> will be enough for the current engine, but not by a wide margin. I
> plan to run this engine as high as 8000 if I can, though I'll be
> amazed if I can get beyond 7500. Don't need no stinkin' P-Port for
> these rpms :-)
>
>
> Times New Roman
>
>
> ArialFFFF,0000,0000On
> the fuel spreadsheet that I posted (stolen) the other day, it gives a
> HP figure for the flywheel, and rear wheels. The estimate for
> the power loss due to a manual trans and diff is 15% on this
> spreadsheet. Anyone know what this amounts to for our redrive, and
> prop?
>
>
> Times New Roman
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> ArialFFFF,0000,0000Cheers,
> or>
>
>
> ArialFFFF,0000,0000Rusty
> (hoping Ed out types me)
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