What kind of injectors?

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Old Oct 15, 2007 | 06:53 PM
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What kind of injectors?

I was wondering what size of injectors are usually installed on the typical 20B motor? Are we talking about similar injector size?

Where can I read about this??
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Old Oct 15, 2007 | 06:56 PM
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Stock - 550cc primaries and 850cc secondaries if I'm not mistaken. Most swap these out for 850 primaries and something much larger for secondaries, 1350cc or 1600ccs.
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Old Oct 15, 2007 | 07:57 PM
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Originally Posted by RotorFrank
I was wondering what size of injectors are usually installed on the typical 20B motor?
Stock 20B-REW:
Primary - 550cc/min side feed
Secondary - 550cc/min top feed

Originally Posted by RotorFrank
Where can I read about this??
Calculator here:
http://www.rceng.com/technical.aspx

If you aren't familiar with all the confusing numbers, just use the following and it will be close enough for government work.
Rotary Engine BSFC = .55 non-turbo, .64 turbo
Maximum Injector Duty Cycle = .80
System Fuel Pressure = 43.5

Originally Posted by David Hayes
Stock - 550cc primaries and 850cc secondaries if I'm not mistaken.
550/850 is stock on the 13B-REW, not the 20B-REW.
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Old Oct 15, 2007 | 08:27 PM
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sorry EA, but they are 550 top feed for primary and secondary, Ive had four of them...

kenn

Originally Posted by Evil Aviator
Stock 20B-REW:
Primary - 550cc/min side feed
Secondary - 550cc/min top feed


Calculator here:
http://www.rceng.com/technical.aspx

If you aren't familiar with all the confusing numbers, just use the following and it will be close enough for government work.
Rotary Engine BSFC = .55 non-turbo, .64 turbo
Maximum Injector Duty Cycle = .80
System Fuel Pressure = 43.5


550/850 is stock on the 13B-REW, not the 20B-REW.
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Old Oct 15, 2007 | 11:28 PM
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From: Charlottesville, Virginia, USA
Originally Posted by kenn_chan
sorry EA, but they are 550 top feed for primary and secondary, Ive had four of them...

kenn
Those are some pretty funny looking top feeds.

Attached Thumbnails What kind of injectors?-p0001541.jpg  
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Old Oct 16, 2007 | 05:07 AM
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Originally Posted by kenn_chan
sorry EA, but they are 550 top feed for primary and secondary, Ive had four of them...
Uh, no.

Primaries are side feeds.
Secondary are top feeds.

And, I dunno what you're smoking, but the 20B comes with SIX fuel injectors...


-Ted
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Old Dec 23, 2008 | 01:17 PM
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Back from the dead.

Maybe someone will know, are the 13b-re and 20b primary injectors the same? I thought I saw somewhere that the RE was actually 540cc. They look very similar though.

Thanks
~Tweak
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