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01-25-2017, 06:52 PM
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Join Date: Jan 2007
Location: Benton, Kansas
Posts: 259
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Engine mount dyna 1 or dyna 2? 320/360
Guys - I am about to order finish kit - finally (-4)
I am a little stumped on engine mounts. As far as I know, for the most part, the parallel valve O320 and O360 engines use the same mount. What I can't seem to find, (I am tired for the record) is whether I need a dyna 1 or dyna 2 mount. I was originally wanting to go 320, but I want to have the option to go 320 or 360.. when I am ready for FWF.
I know it's a chicken and egg thing, do I buy the engine first and build the mount around the engine, or buy the finish kit first, and then find an engine that fits. I am doing the latter...
So - dyna 1 or 2?
Gregg
__________________
Gregg J. Brightwell
Benton, KS
CFII/MEII, ATP, AGI, A&P
-4 Emp and Wings complete!
Fuselage out of the jig!
www.mykitlog.com/gbrightwell
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01-25-2017, 07:04 PM
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Join Date: Mar 2005
Location: SE Florida
Posts: 1,499
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Dynafocal 2 is rather rare
Quote:
Originally Posted by Gregg Brightwell
Guys - I am about to order finish kit - finally (-4)
I am a little stumped on engine mounts. As far as I know, for the most part, the parallel valve O320 and O360 engines use the same mount. What I can't seem to find, (I am tired for the record) is whether I need a dyna 1 or dyna 2 mount. I was originally wanting to go 320, but I want to have the option to go 320 or 360.. when I am ready for FWF.
I know it's a chicken and egg thing, do I buy the engine first and build the mount around the engine, or buy the finish kit first, and then find an engine that fits. I am doing the latter...
So - dyna 1 or 2?
Gregg
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Greg,
All single engine Lycomings use the Dynafocal 1 system. Dynafocal 2 is used on a very small number of Lycomings used on twin engine aircraft. The difference is in how far the engine is mounted from the firewall [different mounting angle]. Best to get the engine first. That said, you can safely order a Dynafocal 1 mount. That's because, even if you buy one of the [rare as hens teeth] Dynafocal 2 engines, it can be converted to Dynafocal 1 by sending the crankcases to Divco for conversion.
Charlie
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01-25-2017, 07:10 PM
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Join Date: Oct 2012
Location: Clearwater, FL KCLW
Posts: 1,281
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Dynafocal 1 is more common, I believe the type 2 was mostly limited to special cases like the twin commanche. There are plenty of older conical mounts out there was well, however the case could be machined to a dynafocal mount if absolutely necessary I believe.
I have also heard that vans sells different mounts for the
320 vs 360 due to weight differences but people have used either mount with either engine.
Chris
__________________
Chris Johnson
RV-9A - Done(ish) 4/5/16! Flying 4/7/16
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01-25-2017, 09:21 PM
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Join Date: Jul 2005
Location: Hubbard Oregon
Posts: 9,035
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Quote:
Originally Posted by Gregg Brightwell
Guys - I am about to order finish kit - finally (-4)
I am a little stumped on engine mounts. As far as I know, for the most part, the parallel valve O320 and O360 engines use the same mount. What I can't seem to find, (I am tired for the record) is whether I need a dyna 1 or dyna 2 mount. I was originally wanting to go 320, but I want to have the option to go 320 or 360.. when I am ready for FWF.
I know it's a chicken and egg thing, do I buy the engine first and build the mount around the engine, or buy the finish kit first, and then find an engine that fits. I am doing the latter...
So - dyna 1 or 2?
Gregg
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Dyna 2 is now only available as a special order because it is so rare, so maybe that will help you decide.
__________________
Opinions, information and comments are my own unless stated otherwise. They do not necessarily represent the direction/opinions of my employer.
Scott McDaniels
Van's Aircraft Engineering Prototype Shop Manager
Hubbard, Oregon
RV-6A (aka "Junkyard Special ")
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01-26-2017, 07:49 AM
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Join Date: Aug 2010
Location: Wichita, KS
Posts: 1,958
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Go Dyna 1, Gregg. Especially if you're still looking at the possibility of picking up a core from Air Plains like you mentioned previously. Those 320's all come off Skyhawks and are all Dyna 1's.
__________________
Kurt W.
RV9A
FLYING!!!
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