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RE: Engine Mounts - Rubber or Solid

To: "Dick J" <lsr_man@yahoo.com>,
Subject: RE: Engine Mounts - Rubber or Solid
From: "Albaugh, Neil" <albaugh_neil@ti.com>
Date: Fri, 12 May 2006 11:19:41 -0500
Good question, Dick. 

There are many considerations when deciding which way to go-- rubber
engine & tranny mounts greatly reduce the noise & vibration that would
be transmitted into the chassis by solid mounts and a car driven on the
street would be pretty unpleasant with solid mounts. On a race car this
isn't such a big consideration; solid mounts keep things positively
located so things like throttle linkage, gear change linkage, etc remain
aligned and engine torque doesn't throw everything out of line. The
engine/tranny can be part of the chassis structure and strengthen &
stiffen the chassis but one must not allow the loads to distort the
block to the point of ruining the main bearing & crank clearances.

Solid mounts need to be accurately located-- you can't tighten bolts to
pull things together without distorting the block or chassis. Another
consideration is the possibility of rubber mount failures.

Regards, Neil    Tucson, AZ


-----Original Message-----
From: owner-land-speed@autox.team.net
[mailto:owner-land-speed@autox.team.net] On Behalf Of Dick J
Sent: Thursday, May 11, 2006 6:51 PM
To: lsr list autox
Subject: Engine Mounts - Rubber or Solid

I've seen LSR cars with rubber engine and transmission mounts; some with
solid engine mount and rubber transmission mount; and some with solid
mounts all the way around.  
  Anybody have any comments on the why's and wherefor's of these
combinations?
  DickJ
  In East Texas




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