From john@wagoneers.com Mon Jun 9 12:48:15 2008 From: john RE: looking for better motor mounts to reduce 6.2L Diesel vibration in '91 Grand Wagoneer (using Novak adapter kit) Talked to Novak about the vibrations associated with their motor mount kit... Chevy V8 into a Full Size Jeep... the engineer noted that their current offering is optimized, not too soft, not too firm, but not intended for a Diesel... the dimensions I am working with are: 5/8" bolt (ID) largest diameter of the existing mount 2.25" smallest diameter of the mount 2" total thickness: 1.25" here's a picture of the kit: http://www.novak-adapt.com/images/pics/mounts/mmx-nc1.jpg the donut in the middle is the object of interest. The two constraints are: 5/8" Inner diameter of the rubber total thickness of about 1.25" here's the location: http://wagoneers.com/FSJ/Omega/Omega-motor-mounts-lights_28May2008/ this picture shows the driver's side most clearly: http://wagoneers.com/FSJ/Omega/Omega-motor-mounts-lights_28May2008/P1180366.jpg passenger side: (removed in an attempt to try the 55-57 chevy v8 mounts) http://wagoneers.com/FSJ/Omega/Omega-motor-mounts-lights_28May2008/P1180364.jpg I do not see an issue with a larger outside diameter mount, there is at least 4 inches of clearance and shape is not a limiting factor. I would think that increasing the thickness a bit would not be a significant problem, but would think that 1.5" would be the safe limit. If too much thickness is added it could begin affecting underhood clearance and driveline angle. I went to NAPA and we tried mounts for a 55-57 Chevy V8... correct shape but the ID was way too small and the OD was also quite small, if I had opened the ID up I would have had a thick o-ring. A chunk of vibration absorbing rubber or some kind of compound capable of holding about 500 to 600lbs with a 5/8" hole in the middle and maybe about 3" in diameter, or even 3" x 3" square or so would work. Layering of material would be fine too. Open to any ideas. The project is almost done and got 23.75 mpg on a trip from Portland, Oregon to Seattle traveling at the posted limits (60-70 mph). Suggestions on vibration reduction mounts or materials? The guy at Novak has heard of a liquid filled mount possibly used on a Ford Taurus V6. I'm open to any ideas, preferably one that will bolt right in. Polyurethane is NOT recommended... neither is pasta or ravoli. ;) thanx, john meister ----- ------------------------------------------------------------------------- Snohomish, Washington -o|||||o- where Jeeps don't rust, they mold http://wagoneers.com john's 6.2L GW: http://wagoneers.com/FSJ/Omega/ SAVE FUEL use AMSOIL Synthetics: http://wagoneers.com/AMSOIL -------------------------------------------------------------------------