flyrotary@lancaironline.net Mailing List Archive

Yes, Bill, having had more than one air cleaner cover leave an old flat head V8 I used to torture, I learned that too lean can actually be dangerous to the mechanic {:>). On the other hand, too rich generally just blew the muffler off.

I have often wondered about the time I lost the number 1 rotor at 7500 MSL headed to Sun & Fun. I found that if I cranked up the mixture knob to full rich, the fuel flow showed 14.5 GPH and the remaining rotor could keep my heavily loaded RV-6A level at 6500 MSL. But, I could just imagine the tail pipe on the failed rotor with all that gas pouring through it probably looked like a miniature jet in after burner - shock diamonds and all {:>). On second thought, perhaps its just as well I didn't know.

----- Original Message -----

From: wrjjrs@aol.com

To: Rotary motors in aircraft

Sent: Thursday, September 06, 2007 7:57 PM

Subject: [FlyRotary] Re: Idel issues

Ed, your analysis is just fine BTW. In cars and bikes we usually said if the engine coughs or backfires in the carburetors its too lean, timing can effect this as well. If the engine backfires out the exhaust it is usually too rich. On rotary powered cars this can also result in about a 4' flame out the tailpipe!

Bill Jepson

PS. you can always tell who is following you too close into the corners by the scorched paint on the grill!

-----Original Message-----
From: Ed Anderson <eanderson@carolina.rr.com>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Sent: Thu, 6 Sep 2007 2:51 pm
Subject: [FlyRotary] Re: Idel issues

Ah, a totally different problem. Does it sound like the engine is running too rich below 2000 or too lean. Too rich generally has sort of a sloppy sound to the exhaust, too lean has more of a bark - not very scientific, but based on experience.
One, of the first thing I would check is your ignition timing. If too advanced that might prevent it from idling readily at lower rpms.
Be aware that on some year models the timing pulley is indexed differently that throws off timing by 10-20 deg - no, sorry, I don't recall which years.

Ed
----- Original Message ----- From: "Shane Daly" <shane@innovativewings.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Thursday, September 06, 2007 5:35 PM
Subject: [FlyRotary] Re: Idel issues

> its not that its idling high it is that it will not stay idling below > 2000rpm I have to hold the throttle open or it will stall. It does run > smooth from 2- 6000 rpm
>
> Kevin
>
> ----- Original Message ----- > From: "Ed Anderson" <eanderson@carolina.rr.com>
> To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
> Sent: Thursday, September 06, 2007 11:28 AM
> Subject: [FlyRotary] Re: Idel issues
>
>
>>I second Bob's suggestion.
>>
>> It does not take much of a leak to have the rotary idle at 2000 rpm. >> There are a number of areas in the Rx-7 that air could find its way into >> the induction system. Exchanging engine with all the air lines ranging >> from the air bleeds to the injectors and oil injectors to hoses hooked to >> the intake manifold and all the vacuum lines/valves make it highly likely >> that something has been left off or perhaps now has a crack in it.
>>
>> I seriously doubt that the O2 sensor would affect idle rpm that much. >> Although the absence of an O2 sensor may have the EFI computer confused >> and adding more fuel, but it would still take more air through the >> induction system to use that fuel and have it idle faster.
>>
>> Ed
>>
>>
>> ----- Original Message ----- >> From: "Bob White" <rlwhite@comcast.net>
>> To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
>> Sent: Thursday, September 06, 2007 12:33 PM
>> Subject: [FlyRotary] Re: Idel issues
>>
>>
>>> Hi Kevin,
>>>
>>> Are you using EFI? My first thought would be to look for air leaks in
>>> the intake system.
>>>
>>> Bob W.
>>>
>>> On Thu, 6 Sep 2007 10:04:23 -0600
>>> "Shane Daly" <shane@innovativewings.com> wrote:
>>>
>>>> I just swaped my block out its a 13b non turbo . last block ran fine >>>> idled fine.but for some reason this one will not idle below 2 thousand >>>> rpm.any suggestions on what i missed or direction to go in?
>>>> kevin
>>>
>>>
>>> -- >>> N93BD - Rotary Powered BD-4 - http://www.bob-white.com
>>> 3.8 Hours Total Time and holding
>>> Cables for your rotary installation - http://www.roblinphoto.com/shop/
>>>
>>> --
>>> Homepage: http://www.flyrotary.com/
>>> Archive and UnSub: >>> http://mail.lancaironline.net:81/lists/flyrotary/List.html
>>>
>>
>>
>> --
>> Homepage: http://www.flyrotary.com/
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>>
>>
>> -- >> No virus found in this incoming message.
>> Checked by AVG Free Edition. Version: 7.5.485 / Virus Database: >> 269.13.7/992 - Release Date: 9/6/2007 8:36 AM
>>
>>
>
>
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