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  #41  
Old 11-20-2017, 11:02 AM
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rv6ejguy rv6ejguy is offline
 
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Mike Talmadge just posted this weekend that he received the first of the new Egg replacement gearbox cases from the anodizer. I hope he'll have one assembled for testing before the year is out.
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Ross Farnham, Calgary, Alberta
Turbo Subaru EJ22, Marcotte M-300, IVO, RV6A C-GVZX flying from CYBW since 2003- 420 hrs. on the Hobbs,
RV10 95% built- Sold 2016
http://www.sdsefi.com/aircraft.html
http://sdsefi.com/cpi.htm


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  #42  
Old 11-28-2017, 11:58 AM
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Default Empty weights

I polled on the Subenews site and got some replies on RV empty weights with EJ25 four cylinder engines fitted:

1107 IFR equipped but no paint
1167 well equipped complete with paint
1166 on my turbo 6A with heavy paint, steam gauges, 2 full sized AGM lead acid batteries, sound proofing, extra wiring for R&D/ test purposes, roll servo, various patches for airframe mods over the years and a heavy repair on the cowling.

No doubt in my mind that you can easily get below 1100 pounds with a 4 cylinder Subaru, especially using the SPG redrive instead of the M300 or Egg Gen 3 gearbox.
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Ross Farnham, Calgary, Alberta
Turbo Subaru EJ22, Marcotte M-300, IVO, RV6A C-GVZX flying from CYBW since 2003- 420 hrs. on the Hobbs,
RV10 95% built- Sold 2016
http://www.sdsefi.com/aircraft.html
http://sdsefi.com/cpi.htm


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  #43  
Old 12-04-2017, 06:10 AM
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rv6ejguy rv6ejguy is offline
 
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Mike Talmadge has received the new parts and assembled the first of the new re-engineered gearboxes for Egg Subaru packages. This is good news for the Egg Sube engine community as it gives them a new supplier of these critical parts to keep on flying their conversions. Second nice thing is the new box is 8.5 pounds lighter. Kudos to Mike for all this hard work in getting to this point.

On to testing soon.
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Ross Farnham, Calgary, Alberta
Turbo Subaru EJ22, Marcotte M-300, IVO, RV6A C-GVZX flying from CYBW since 2003- 420 hrs. on the Hobbs,
RV10 95% built- Sold 2016
http://www.sdsefi.com/aircraft.html
http://sdsefi.com/cpi.htm


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  #44  
Old 12-04-2017, 08:33 AM
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Quote:
Originally Posted by rv6ejguy View Post
Mike Talmadge has received the new parts and assembled the first of the new re-engineered gearboxes for Egg Subaru packages. This is good news for the Egg Sube engine community as it gives them a new supplier of these critical parts to keep on flying their conversions. Second nice thing is the new box is 8.5 pounds lighter. Kudos to Mike for all this hard work in getting to this point.

On to testing soon.
Can you define "re-engineered" for us? Did a valid Torsional Vibration study occur, and if so with which propeller?
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Greg Niehues - VAF 2018 dues paid
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N16GN flying! http://websites.expercraft.com/airguy/
Built an off-plan 9A with too much fuel and too much HP. Should drop dead any minute now.
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  #45  
Old 12-04-2017, 09:57 AM
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Quote:
Originally Posted by airguy View Post
Can you define "re-engineered" for us? Did a valid Torsional Vibration study occur, and if so with which propeller?
The original Egg Gen 3 box was reverse engineered and improved in areas where previous problems have been revealed by users.

At this time, no testing has been done and I'm not sure what tests Mike intends to perform outside on running tests on an engine, likely with the common MT 3 blade electric prop.



There does not appear to be any serious TV issues on engines equipped with the dual mass flywheel. Many thousands of flight hours collectively on the Gen 3 boxes now.

Main areas addressed were bearings and lubrication, elimination of the welded shafts and improved splined shaft.
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Ross Farnham, Calgary, Alberta
Turbo Subaru EJ22, Marcotte M-300, IVO, RV6A C-GVZX flying from CYBW since 2003- 420 hrs. on the Hobbs,
RV10 95% built- Sold 2016
http://www.sdsefi.com/aircraft.html
http://sdsefi.com/cpi.htm


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  #46  
Old 12-04-2017, 10:13 AM
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Are we calling this one "Gen 4" or has Mike given it a different moniker?
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Greg Niehues - VAF 2018 dues paid
Garden City, TX
N16GN flying! http://websites.expercraft.com/airguy/
Built an off-plan 9A with too much fuel and too much HP. Should drop dead any minute now.
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  #47  
Old 12-04-2017, 11:40 AM
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I haven't heard of Mike giving it a designation yet. Should maybe just call it the Mike box since it's really an all new design with the same mounting footprint as before for retrofit purposes.
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Ross Farnham, Calgary, Alberta
Turbo Subaru EJ22, Marcotte M-300, IVO, RV6A C-GVZX flying from CYBW since 2003- 420 hrs. on the Hobbs,
RV10 95% built- Sold 2016
http://www.sdsefi.com/aircraft.html
http://sdsefi.com/cpi.htm


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  #48  
Old 12-04-2017, 04:54 PM
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Mike uploaded some photos today of the new box.
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Ross Farnham, Calgary, Alberta
Turbo Subaru EJ22, Marcotte M-300, IVO, RV6A C-GVZX flying from CYBW since 2003- 420 hrs. on the Hobbs,
RV10 95% built- Sold 2016
http://www.sdsefi.com/aircraft.html
http://sdsefi.com/cpi.htm


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  #49  
Old 12-26-2017, 05:14 AM
clarkefarm clarkefarm is offline
 
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Hello Ross , Dan and others,
I appreciate the discussion about TV but wonder where the secondary harmonics might be for a four cylinder EJ25. I am still flying an NSI package which includes a sprague clutch but use an idle of around 2,000 rpm (943 prop rpm) which would be above the 1,500 primary area and also above the level where the clutch is apparently locked.
I also wonder if it is possible to monitor the effects of vibration with knock sensing. The newer Motec M1 series ECUs will monitor 4 user defined frequencies per cylinder.
I have always noticed quite an improvement in smoothness from 5,500 to 5,000 or 6,000 rpm but I suppose the prop has quite a bit to do with it too.
I was also quite surprised about how much extra fuel and reduced timing Subaru use on a NA 2009 Forester which we ran on the dyno at high power settings. At 6,000 rpm 90 kPa we saw an AFR of 10.5 and an advance of 23 degrees. There was a massive jump between 4,000 and 4,500 rpm 80 kPa in fuel from AFR 14.4 to AFR 11.9. Timing was also taken out by 3 degrees; 24.5 to 21.5.
I guess the take home message is don't skimp on fuel when you are looking for power unless melted pistons make you happy.
I may be wrong but is there potential for a relationship between knock or a faster fuel burn rate and torsional vibration ?
Rupert Clarke
RV-9A, EJ253 SOHC, NSI A40 gearbox, NSI CAP 200 72" prop (composite blades by Whirlwind)
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  #50  
Old 12-26-2017, 08:02 AM
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rv6ejguy rv6ejguy is offline
 
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Rupert, we've known about what the factory does for timing and fueling from the factory for about 15 years to keep the pistons alive at high power. Those who fail to duplicate those settings usually destroy pistons. I've seen it many times now.

I would not think there is a strong relationship between AFRs and TV. Knock is to be avoided at all costs from a longevity POV.

TV studies for aircraft would normally involve instrumentation of the prop shaft rather than somewhere on the engine itself.
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Ross Farnham, Calgary, Alberta
Turbo Subaru EJ22, Marcotte M-300, IVO, RV6A C-GVZX flying from CYBW since 2003- 420 hrs. on the Hobbs,
RV10 95% built- Sold 2016
http://www.sdsefi.com/aircraft.html
http://sdsefi.com/cpi.htm



Last edited by rv6ejguy : 12-26-2017 at 08:25 AM.
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