Mark,

I assume you will install the diode between the solenoid input and the starter case for = ground???

Bill B

From: = Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Mark Steitle
Sent: Wednesday, January = 26, 2011 2:36 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: = Most stupid question here ever...rotor position

Bill,

That's exactly the contactor that I have, which does have a = spike supressor diode installed. The "solenoid" that I was = referring to earlier is the one that is part of the starter motor. And no, = mine does not have a spike supression diode, but it will very soon. =

Mark

On Wed, Jan 26, 2011 at 1:16 PM, Bill Bradburry <bbradburry@bellsouth.net>= wrote:

Mark,

Yes, I got my contactor from B&C = here..

http://www.bandc.biz/intermittentdutystartercontactor.a= spx

it has a built in spike suppressor diode in it. = However, I am also using the solenoid that came on the starter, and I don’t = think that there is a spike suppressor diode on it. I will have to look as I = can’t remember. Is your set up much different from = this?

Bill

From: Rotary motors in = aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Mark = Steitle
Sent: Wednesday, January = 26, 2011 2:06 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: = Most stupid question here ever...rotor position

Bill, =

I = take it to mean the solenoid, not the motor. Here is Tracy's = post...

<quote>

Basically, anything that has an inductive load (relay, solenoid, etc) and is = switched on and off should have a diode clamp unless the something about the design requires none.

BTW, = aside from the diode clamps, all those relays and contactors introduce more = possibilities for routing problems in electrical systems. Yes, I know the = theoretical reasons for having contactors and relays in aircraft but I didn't use = any at all.

Electronic engineer's mantra:

Every = wire is a resistor.
Every wire is an inductor.
Any two wires are a capacitor.
Any two wires are a transformer.
None of these components show up on a schematic.
All of these components affect circuit performance.
Nobody gets engineer jokes at a cocktail = party.

Tracy

Mark

On = Wed, Jan 26, 2011 at 12:07 PM, Bill Bradburry <bbradburry@bellsouth.net> = wrote:

Mark,

Are you talking about the primary of the starter = solenoid? Mine has diodes across the primary. Isn’t that supposed to = catch the spikes??

Bill B

From: Rotary motors in = aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Mark = Steitle
Sent: Wednesday, January = 26, 2011 11:05 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: = Most stupid question here ever...rotor position

Chris,

Yes, = overthinking problems is easy to do. I typically lean toward underthinking problems.

I was = going to stop by on Saturday, but I experienced a corrupted MAP table incident = just prior to departure. It didn't dawn on me initially what had hapened. But as soon as I looked at the map table I knew that it had been corrupted. I reloaded the factory table and it fixed the immediate problem. Now I just need to figure out = why it happened. Tracy suggested it may be a spike eminating from the starter solenoid. =

Mark

On = Wed, Jan 26, 2011 at 9:47 AM, Chris = Barber <cbarber@texasattorney.net> wrote:

Mark,

Thanks. That is what I was = thinking but then I started over thinking it.

Now I can focus on the other tasks at hand. Again, I believe it to be timing related. When I = turned the CAS, retarded I think (clockwise), it seemed to crank a bit better = on B. So, like I said, I may be a tooth off. At least it is a = starting point.

Isn't this = fun.......:-\

Chris

From: = Rotary motors in aircraft [flyrotary@lancaironline.net] on behalf of Mark Steitle [msteitle@gmail.com]
Sent: Wednesday, January = 26, 2011 9:06 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: = Most stupid question here ever...rotor position

Chris,

The rear rotor will only fit one way as dictated by the = eccentric shaft, stationary gear and rotor housing. So, don't = disassemble the motor again... unless you just need something to do with your spare = time.

Mark

On Wed, Jan 26, 2011 at 8:50 AM, Chris Barber <cbarber@texasattorney.net> = wrote:

This may be the most stupid question posed on this = site.

Ok, first the update on my loss of compression in my rear = rotor housing. I tore open the engine and everything looked really good, except, as expected, the springs for the apex seals had been = flattened. Upon reflection, I also remember removing the rear spark plug a while = back and recall I replaced it due to the plug removed looked damaged. At = the time, since the engine seemed to be running ok (event though difficult to = start), I didn’t think too much of it. However, now I realize that it = was a clear indication of detonation.

Seems like a no brainer now, but sometimes I gotta be = hit across the skull with the obvious. Flame suite on but in the = tradition of John Slade, I do wish to post my failures to help others learn and to = hopefully finally get it.

Anyway, I got everything buttoned up and got it to start = last night. I reset all the EC2 parameters to the factory = defaults. It did not run well. I could not even get it to start on the A = computer, and it started after a lot of extended cranking on the B computer. It = did not run great on B. My suspicion is that the timing is off. The = B computer was tuned a long time ago and has not been updated. I = plan to do a static timing check this evening if I can get out to the hangar. = I have gotten that process down pretty good now. I think I may be off a = tooth on the crank angle sensor. I think a combination of a lean mixture = and bad timing may be the predominant factors in my detonation problem. I = had a friend point out the obvious in that the pinging I may have thought I = would hear would not be too likely with the noise of the prop. = DOH!

I did do the EC2 check and the injectors are clicking dutifully and I saw strong spark on all = plugs.

Ok, here is the stupid question and a major bonehead = moment. I remember that you must “ clock “ the rear rotor to the = front rotor when installing them. However, when I installed the rear rotor the = other day I placed it where I though it needed to go base on when I removed it, = however, I can’t remember now if I actually got it back in the right position = in relation to the front rotor. I was thinking it is only gonna fit one = way based on the position of the e-shaft to the chamber walls. Is this = so, or could I have it out of position? I am having visions of me getting = it to start with the rear rotor out of position, thus only running on the = front rotor while banging the hell out of the rear rotor. Would it even = start if this were so?

If I gotta tear it down to check, I will and as = mentioned, cracking open is not all that big a deal anymore. Other than this = obvious brain fart, I am understanding the process much better….rote = practice does this.

Thanks guys/gals.

Chris = Barberfly