flyrotary@lancaironline.net Mailing List Archive

OK Mark. Also take note of my last message on centering the trigger wheel. Nearly drove me nuts figuring that one out last week. Yours must have centered up OK when you installing it. BTW, did you happen to remove and re-install the trigger wheel when you changed CAS mounts? That could have accounted for the different results.

Tracy

On Feb 4, 2008 8:12 AM, Mark Steitle <msteitle@gmail.com> wrote:

Tracy,

I'm reluctant to change anything now that its running like it should. My engine always starts right up with very little priming. Since I still have the 4130 bracket, I may reinstall it along with the 1k ohm resistor and see how it runs. I'll let you know if it helps or hurts.

Mark

On 2/3/08, Tracy Crook <tracy@rotaryaviation.com> wrote:

I did the 9.7 CR rotors in mine but have never done a front to back comparison with the stock 9.0s. It does run strong with the 9.7s though!

BTW, all builders using the Renesis Crank sensors take note:

I had a lot of trouble starting my 20B with Renesis CAS installed. Just yesterday I found out why. The Renesis CAS is a much higher impedance sensor than the RX-7 CAS and this makes it much more sensitive to noise pickup, especially when the starter is running. It needs a load resistor across it to avoid this problem. Install a 1000 ohm (1/4 or 1/2 watt is fine) across the leads of the sensor either at the sensor or near the EC2.

After installing one on mine it went from very difficult to instant starting.

I'm not sure why I have not seen this problem on my RV-4 with Renesis engine but one other Renesis user has seen the problem and the resistor fixed it immediately.

Mark S., you should definitely do this on your 20B / Renesis setup as well. I am starting to suspect that this is why your earlier steel mount (for CAS) did not work. A very small difference in how the CAS is mounted affects the noise characteristics a lot. Either mount would probably have worked fine with the resistor installed.

Future EC2s for Renesis engines will have this installed internally.

Tracy

On Feb 3, 2008 4:44 PM, bob.kaufmann <bob.kaufmann@cox.net> wrote:

Gang

I have a 20B that I have taken the turbos off and will be using it in an
aircraft, a RV-10. A friend of mine said that I should use the 9.7
compression rotors instead of the turbo rotors. What say you all?

I have pulled the engine off to powder coat the engine mount and if I'm
going to switch rotors, now is the time before I hang the engine again. I
have the flat plate on milling machine so I could make plates for the 20B if
people wanted. I think I would be competitive. I would like to do them in
groups of ten if people are interested.

Bob K
Finished except all the parts aren't together yet.

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