flyrotary@lancaironline.net Mailing List Archive

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Rusty,

I have identified the local supplier and MSD are indeed cost effective.

I have selected a 38lb (2018) primary and a 50 lb ( 2013) secondary for the single.

It may be wishful thinking but I don't want to run lean at 7,500 rpm. The 2x 400 cc ( 38lb) runs out of puff at 121hp and I'm hoping for a tad more than that with the PP and RX8 rotor. In the end it may only be 125hp but the combination will reach 140hp within the 80 % duty cycle so I figure I'm safe from running lean.

Question is how come these are cheaper than the mazda and other known brand injectors - I expected them to cost more.

George ( down under)

----- Original Message -----

From: Russell Duffy

To: Rotary motors in aircraft

Sent: Monday, September 19, 2005 11:42 PM

Subject: [FlyRotary] Re: Injectors

although if you are going to stick injectors into the primary injector holes in the block, are sort of stuck with Mazda (or similar).

Hi Ed & George,

I've had good luck with "MSD" injectors, which are actually made by Rochester. Summit Racing sells them in various sizes, for about $50 each. TWM sells fuel rails, which are easy to modify into whatever you need for your application. Since George is a devoted PP kinda guy, he won't have to worry about fitting the stock holes in the housing.

The MSD injector is a little smaller on the engine end, and a little larger on the fuel rail end, compared to the stock Mazda injectors. I was able to bore out a stock cast aluminum Mazda fuel rail, and then made a sleeve to fill the gap on the engine side. This worked very well, and it was nice to avoid the old injector blues.

Cheers,

Rusty (one less plane now)