[NSRCA-discussion] Mounting Dimension - Hyde "Type C"

[colin chariandy]

Does anyone know where the limit lies for adding support to headers with the newer mounts (AR60, AR70, AR80 etc)? 
   
  If the short Hatori muffler and header is used with the AR80 do we need some additional support?
   
  Colin.

Lance Van Nostrand <patterndude at tx.rr.com> wrote:
          These type C's are really new (the Mk III's anyway).  I would assume Merle's dimensions have not really changed.  Here's some info I got from Merle directly that others may find interesting.  I sure did:
   
  Hi Lance,

I don't have any pictures.  The new "C" MKIII mount (isolator) looks the same as the earlier ones.  Now I am using rectangular 1/4" x 1/2" aluminum beams oriented/attached flat on the mount.  This makes the mount now usable with 18 pattern engines, including the OS160 which is a wide crankcase engine.

Each beam has 6 drilled and tapped 6-32 holes - permitting a wide application range.  Beams positioned flat are even stronger.  Overall length from firewall to thrust washer is 6 3/8" for all YS, 3M, WEB, OS140, OS160, and OS120-200 4 strokes.  Use of different beam bolt patterns even permits 6 1/4" FW to TW for many engines!!

The "AR"(A)s (2 engine lug holes attachment) are being discontinued and being replaced with all 4 engine lug attachment aluminum beams.  The newer mounts, that replace them, are being rated by "CDR" (current drain reduction).  The "CDR" range is from 60-95%, and the mounts will be identified as "AR 60", "AR 70", "AR 80", "AR 85", "AR 90", and "AR 95", plus a very light weight MICRO series, that are "MR 80", "MR 85", "MR 90", "MR 95".

The highest CDR numbers are the softest mounts and require more airframe clearance for idle movement, plus softer mounts requires exhaust attachment methods as we have discussed in the past, or a method for the exhaust system to endure the "ride" or additional movement - overall benefits of the very soft mounts are to the major high value airborne equipment - such as servos, pots, gears, linkage, including entire airframe.

All are for 4 engine lug hole attachment and position the most popular engines at 6 3/8" or 6 1/4" from firewall to thrust washer. 

The "AR 80" is highly recommended by Mike Hester for the "beastie DZs".

I will continue the firmer Type "C" MKIIIs.

The CDR rating is an average for engines from 1.20 to 2.0 cuin. - the rating is approximate for a 160 size engine.  The aluminum beam mounts will no longer be engine specific - except for those that incorporate the nose ring - the ARI series must be set up for a specific engine due to varying front housing diameters and etc..

I'm sure this will be confusing for a while - but with consistent overall length and wide engine applications there will actually be considerably fewer mounts to chose from - approximately 10  if all the CDRs are in the mix - vs 25 to 30 - Central carries the "AR 80", and may include the "AR 60"s and "AR 70"s.  Also I have modified the firewall attachment bolt pattern to permit use of either 3 or 4 attachment screws - the new bolt pattern permitts the selection of either a "triangle" or "rectangle" pattern - making the mounts interchange with other brands - plus permitting the use with many engines makes the mounts fairly universal.  The pattern guys like to interchange engines, they can now also interchange some mounts..

Best,

Merle

    ----- Original Message ----- 
  From: Bob Pastorello 
  To: NSRCA Mailing List 
  Sent: Tuesday, September 18, 2007 7:31 PM
  Subject: [NSRCA-discussion] Mounting Dimension - Hyde "Type C"
  

  Would anyone who is using this mount with an OS 1.60 tell me the minimum firewall to spinner backplate dimension this mount will permit?  I have only so much nose....
  
Bob Pastorello
www.rcaerobats.net
rcaerobob at cox.net
    
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