engine mounts
Thread Starter
Racer
Joined: Sep 2002
Posts: 392
Likes: 0
From: Iowa
engine mounts
I bought the Anchor brand engine mounts and noticed that the area that bolts to the frame (horizontal bolt) is about 1/4" wider than the stock mount. I can probably shim it using two 1/8" washers. Has anyone else had this problem? Is it something to worry about? Thanks for any help. :confused:
Le Mans Master
Joined: Apr 2001
Posts: 5,941
Likes: 281
From: Was New Orleans but swam to Baton Rouge LA
Cruise-In IX Veteran
Re: engine mounts (jetech)
I am not fimilar with the Anchor brand mounts. I went with poly mounts from Energy suspension and they fit perfect. Are those mounts poly, rubber or solid??
Melting Slicks
Joined: Aug 2001
Posts: 3,046
Likes: 124
From: Wichita KS
Re: engine mounts (jetech)
jetech.
Several threads about this in the archives. Do you have ANCHOR 2285 mounts? I think the correct ANCHOR mount is 2249. I purchased mine from a vendor and they sent me pn 2285 for my 1980. A check of an unnamed national autoparts web site indicates ANCHOR 2249 is correct.
I decided to go with the replacement mounts available from GM pn 6258154. Same quality as the originals and available at your local dealer. The New GM mounts fit snug - just like the old mounts.
I would not shim ill fitting mounts.
Several threads about this in the archives. Do you have ANCHOR 2285 mounts? I think the correct ANCHOR mount is 2249. I purchased mine from a vendor and they sent me pn 2285 for my 1980. A check of an unnamed national autoparts web site indicates ANCHOR 2249 is correct.
I decided to go with the replacement mounts available from GM pn 6258154. Same quality as the originals and available at your local dealer. The New GM mounts fit snug - just like the old mounts.
I would not shim ill fitting mounts.
Thread Starter
Racer
Joined: Sep 2002
Posts: 392
Likes: 0
From: Iowa
Re: engine mounts (Sigforty)
The mounts are rubber. I bolted them to the engine, they fit fine that way. I did notice that the horizontal bolt came with two 1/8" washers. If I put the washers on the outside of the mount then the bolt isn't long enough. I wonder if they are meant to shim the mount on the inside?
Melting Slicks
Joined: Aug 2001
Posts: 3,046
Likes: 124
From: Wichita KS
Re: engine mounts (jetech)
Do you know the part number of the ANCHOR mounts you have?
I do not think the washers are intended to "shim" the motor mount.
This is not a part to "Bubba". The spacing of the engine mounts will effect the alignment of the rest of your drive train (trans mount, etc).
I do not think the washers are intended to "shim" the motor mount.
This is not a part to "Bubba". The spacing of the engine mounts will effect the alignment of the rest of your drive train (trans mount, etc).
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Team Owner
Joined: Feb 1999
Posts: 34,453
Likes: 665
From: Republic of Texas
Re: engine mounts (UKPaul)
Can somebody tell me what the advantage of poly mounts is over the stock rubber ones?
Thanks
Paul
Thanks
Paul
:cheers:
[Modified by Corey 68, 11:26 AM 2/25/2003]
Team Owner
Joined: Jun 2001
Posts: 23,363
Likes: 1,059
From: Virginia USA
Re: engine mounts (Corey 68)
Can somebody tell me what the advantage of poly mounts is over the stock rubber ones?
Thanks
Paul
Sure they absorb more energy and vibrations from your engine and are more resistane to cracks and warpage.
:cheers:
Thanks
Paul
Sure they absorb more energy and vibrations from your engine and are more resistane to cracks and warpage.
:cheers:
They are also uneffected by grease, gas and oil which will break down rubber over time.
John
Safety Car
Joined: May 2001
Posts: 3,758
Likes: 3
From: Surrey
Re: engine mounts (theandies)
Corey & John,
Thanks for the replies. I have, for a change, been giving this a lot of thought! The poly resistance to oil, grease & heat I can fully agree with, but I'm not so sure about the vibration issue. I better explain why! A Norton Commando has the engine, gearbox, swing arm & rear wheel isolated from the rest of the bike by isolastic mountings (rubber). To decrease vibration you can adjust the mounts to allow the rubber to flex more, thus absorbing vibrations from the engine. As the wheel is also allowed to flex more by doing this the handling will suffer, so there's a happy compromise. Tightening the mounts to improve handling will compress them & cause more vibration to be transmitted to the rest of the bike. So, I figured that rubber engine mounts would absorb more vibes than poly ones. Or have I got that completely wrong? Also, if poly engine mounts are used, then shouldn't the trans mount be poly as well for full effect?
Thanks,
Paul
Thanks for the replies. I have, for a change, been giving this a lot of thought! The poly resistance to oil, grease & heat I can fully agree with, but I'm not so sure about the vibration issue. I better explain why! A Norton Commando has the engine, gearbox, swing arm & rear wheel isolated from the rest of the bike by isolastic mountings (rubber). To decrease vibration you can adjust the mounts to allow the rubber to flex more, thus absorbing vibrations from the engine. As the wheel is also allowed to flex more by doing this the handling will suffer, so there's a happy compromise. Tightening the mounts to improve handling will compress them & cause more vibration to be transmitted to the rest of the bike. So, I figured that rubber engine mounts would absorb more vibes than poly ones. Or have I got that completely wrong? Also, if poly engine mounts are used, then shouldn't the trans mount be poly as well for full effect?
Thanks,
Paul
