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Date: Sat, 10 Apr 2010 23:32:34 -0500
From: Charlie England <ceengland@bellsouth.net>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] ignition confusion
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On 4/10/2010 10:16 PM, kevin lane wrote:
> bought an induction-type timing light, pulled the prop off, put the 
> 3000rpm pill in the msd box, and ran my engine today.  starts easier 
> without the prop on, plus the weather was warmer.  timing appears to 
> be dead on 22° like I intended.  what confuses me is that when I move 
> the timing light clip to the other rotor[#2], the light quits firing.  
> I pulled #2 lead plug and cranked the engine and saw a spark, and the 
> engine actually started and ran on one rotor[#1].  both lead rotor 
> plugs fire together from a dual post coil[waste spark].  not sure why 
> the timing light appears to show that #2 isn't firing.  when I 
> switched posts, then it showed #1 wasn't firing.  so it seems that the 
> plug wire is bad, except when I pull the plug and lay it on the block, 
> I can see it sparking.  the plug wires are blue silicon, with a rigid, 
> spiral wound core wire.  they were originally from the Jeff rose 
> electronic ignition on my Lycoming.  perhaps they confuse the timing 
> light?  should I pull out my old timing light that used a "T" shaped 
> spring coil to pick up the voltage? [pre-induction style]  guess I 
> should test wire continuity.(?)
> the engine still won't rev past about 1500 rpm. [assume it is in 
> transition to main jets?] I am wondering if the gravity-fed fuel 
> doesn't create enough flow/pressure.  I need someone to tell me what 
> electric fuel pump [for a Weber carb] I should buy.  the facet that's 
> in my RV is too noisy, and seems inadequate for continuous loads.
> at 1000rpm I see 60 lbs oil pressure.  is this adequate?
> KevinLane Carpentry
> www.KevinLaneCarpentry.com <http://www.KevinLaneCarpentry.com>
Hi Kevin,

FWIW, there are guys running O-320H series carb'd engines with no 
mechanical pump; just a facet for the main pump & a facet for backup.

I don't know what the Weber expects, but you'd think that if it's a carb 
with a float bowl, it wouldn't need a lot of pressure.

Charlie