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Backplate question for ya. Cox_ba12




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Backplate question for ya. Empty
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Backplate question for ya.

Cox Engines Forum  :: Engines :: Cox Engines

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Thinking Backplate question for ya.

Post  oldguy Sun Jun 10, 2018 7:21 pm

Is there a difference between the black widow backplate and the golden bee? Huh...
Thanks
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Thinking Re: Backplate question for ya.

Post  Ken Cook Sun Jun 10, 2018 8:17 pm

The Golden Bee had a venturi intake of .062" and the Black Widow can vary but typically is around .082". I have had Black Widow backplates that measured slightly larger than that. If the Black Widow is opened up, it can extract a few more rpm's, but the run can be inconsistent not to mention the duration in shortened. I have successfully used .093" without fuel draw issues on the Black Widow.
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Thinking Re: Backplate question for ya.

Post  oldguy Sun Jun 10, 2018 10:59 pm

Ken Cook wrote:           The Golden Bee had a venturi intake of .062" and the Black Widow can vary but typically is around .082". I have had Black Widow backplates that measured slightly larger than that. If the Black Widow is opened up, it can extract a few more rpm's, but the run can be inconsistent not to mention the duration in shortened. I have successfully used .093" without fuel draw issues on the Black Widow.


Would you recommend opening up the venturi on the golden bee to .070
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Thinking Re: Backplate question for ya.

Post  balogh Sun Jun 10, 2018 11:45 pm

I would experiment wih a plastic backplate thst is still sold on the market, before modifying a rarity metal backplate unless you have spare ones.
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Thinking Re: Backplate question for ya.

Post  Ken Cook Mon Jun 11, 2018 4:25 am

I would verify if you have a single bypass cylinder. If your in need of more power, the more effective way of getting more rpm's is to replace it with a dual bypass. There's a considerable difference between the two.
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Thinking Re: Backplate question for ya.

Post  oldguy Mon Jun 11, 2018 1:45 pm

Ken Cook wrote:        I would verify if you have a single bypass cylinder. If your in need of more power, the more effective way of getting more rpm's is to replace it with a dual bypass. There's a considerable difference between the two.

Thanks guy's, understand. No need to open venturi if the cylinder can't accommodate. And yes it has the stock #2 cylinder.
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