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Old 08-29-2008, 08:53 AM   #1 (permalink)
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AT vs MT: Engine Mounts

Hey guys,
I have a 95' Prelude SI with the H23 engine and Automatic Transmission. Do to vibration, I am thinking of replacing my engine mount rubber with urethane, and have been looking at the Energy Suspension kit. Now the kit says its specifically for the MT transmission. My question is: What is the difference between the motor mounts for the MT vs AT? Why would the kit not work on a AT? And if anyone has tried using this kit on a AT?
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Old 08-29-2008, 09:39 AM   #2 (permalink)
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Lol, you'll really find out what vibration means once you install poly mount inserts. If you want a vibration-free cabin, replace with oem. Compare part numbers to see which mounts are different between auto and manual. I suspect only the trans mount would be different.

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Old 08-29-2008, 09:55 AM   #3 (permalink)
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lol.. thanks for the reply about the vibration.... Got me thinking so I did a search and think I found my answer on a diff polly mount site:

"Is there excessive increase in vibration with the stronger urethane motor mounts?

This is the most commonly asked question concerning our motor mounts. There have been no precise measurements of vibration done compared against the stock motor mounts. We do not recommend these mounts on automatic FD's. There is a big difference in the load characteristics that increases vibration as a result of the automatic transmission. But we do recommend them for all manual drive high-performance. Verbal descriptions from one driver to the next can read like night and day sometimes. We describe it as noticeable only at low rpms, when starting out, but nothing that is really excessive or uncomfortable. Most customers agree and are happy with the results, but there are a handful of drivers who report that the vibration is excessive to them. So use your own judgement. There is going to be some increase in vibration due to the characteristics of having a stiffer motor mount. This should be expected by design. The stock rubber mounts do reduce more vibration but in doing so they do not last very long when repetitive stress is placed upon them. Many performance modifications sacrifice some degree of streetability comfort while enhancing performance. This is the choice that drivers must make when making goals and expectations. But again, we standby the description as being minimal and more responsive to the driver."
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Old 08-29-2008, 10:08 AM   #4 (permalink)
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Believe me, the vibrations are terrible even with manual trans, so I can't imagine how bad it'd be with auto based on what they describe.
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Old 09-15-2008, 09:01 PM   #5 (permalink)
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When I did my auto to manual swap, the tranny mounts were different. However, apparently the other motor mounts are different too, although they look exactly the same.
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