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20B MAZDA in black outline paint; C927 on all three rotor housings…. Marc From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Thomas Giddings
Sent: Thursday, March 03, 2011 7:57 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Numbers? Here you go everyone: The engine should be stamped on all the rotor housings and sideplates. Look on the top of the rotor housings where is says "Mazda 20B"
Pre A code: 3 digit numbers only, no letter
A code : Letter A and 3 digit #
B code : Letter B and 3 digit #
All of the above are small dowel pin land motors
C code: letter C and 3 digit #
D code : letter D and 3 digit #
The C and D code have the upgraded sideplates, thicker dowel pin lands. Approx: 4mm thicker On Mar 3, 2011, at 8:34 PM, Kelly Troyer wrote:
Share some of your new found info on the 20B with the group............
Kelly Troyer
"DYKE DELTA JD2" (Eventually) "13B ROTARY"_ Engine
"RWS"_RD1C/EC2/EM2
"MISTRAL"_Backplate/Oil Manifold "TURBONETICS"_TO4E50 Turbo
From: Thomas Giddings <tom@midwestaviation.net>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Sent: Thu, March 3, 2011 5:23:15 PM
Subject: [FlyRotary] Re: Numbers?
Thanks Kelley....Your right...Brian knows his stuff...I have a very early 20B Tom On Mar 3, 2011, at 3:53 PM, Kelly Troyer wrote:
Try Brian Galloway in Calif.........He deals in Mazda parts and is very knowledgeable in the 20B models and the differences between them.........Improvements were made in the year models............For our use in aircraft the upgrades probably are not as important as we are not severely stressing our engines like the racers (Auto) do.........I do know that the later model 20B's sell at a premium...........The last time I corresponded with him he had both early and late 20B's for sale............I bought a 20B auto trans bell housing from him (My 13B "Cosmo" uses it between Tracy's RD1C and engine like "Bulent" of this group .....See photo) attached)..........FWIW Kelly Troyer
"DYKE DELTA JD2" (Eventually) "13B ROTARY"_ Engine
"RWS"_RD1C/EC2/EM2
"MISTRAL"_Backplate/Oil Manifold "TURBONETICS"_TO4E50 Turbo
From: Thomas Giddings <tom@midwestaviation.net>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Sent: Thu, March 3, 2011 9:02:41 AM
Subject: [FlyRotary] Re: Numbers?
On a similar topic...does anyone know how to identify which year 20B I have? I was told ,but have no real way of knowing . On Mar 3, 2011, at 9:37 AM, Kelly Troyer wrote:
If your core engine still has the waterpump on it count the number of bolts on the pump........86-88 13B has 7 WP bolts...........89-91 has 8 WP bolts..... 93-95 13B has an all aluminum WP.......This is quick and dirty but there are other ways if WP is missing...........The 86-91 WP is cast iron bolted to alum Kelly Troyer
"DYKE DELTA JD2" (Eventually) "13B ROTARY"_ Engine
"RWS"_RD1C/EC2/EM2
"MISTRAL"_Backplate/Oil Manifold "TURBONETICS"_TO4E50 Turbo <Bulent_13B_Cosy 2.jpg>--
Homepage: http://www.flyrotary.com/
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