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Advantages of each of the types of motor mounts?
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Author:  MazdaRX8/6 [ Mon Nov 01, 2021 8:17 pm ]
Post subject:  Advantages of each of the types of motor mounts?

I'm planning my slant into RX8 swap. The transplant motor has the flat motor mounts, but I notice that there were also a through bolt type. My build will be moderate HP, and my goal is smooth and quiet. Which mounts would be best for those goals? Keep in mind the RX8 has a transmission to rear end brace (not sure what it is called) that prevents the motor from twisting under load.

So not more than stock load on the mounts.

Author:  Badvert65 [ Tue Nov 02, 2021 4:59 am ]
Post subject:  Re: Advantages of each of the types of motor mounts?

The flat style would likely be easier to fabricate. The through bolt style would be a little more difficult, but would hold the engine better in event of failure of the rubber part.

Author:  Dart270 [ Tue Nov 02, 2021 6:04 am ]
Post subject:  Re: Advantages of each of the types of motor mounts?

Matt is correct. If it were me and I were fabbing everything anyway, I might find a more common (later model) biscuit-style mount. Even just using the SB Mopar V8 biscuits would be easier, or maybe something used w/a SB Ford or Chev... The top stud of the "new" biscuit would go into your stock mount brackets and for the other end you can fab a mount on the car.

Lou

Author:  MazdaRX8/6 [ Tue Nov 02, 2021 4:46 pm ]
Post subject:  Re: Advantages of each of the types of motor mounts?

Quote:
Matt is correct. If it were me and I were fabbing everything anyway, I might find a more common (later model) biscuit-style mount. Even just using the SB Mopar V8 biscuits would be easier, or maybe something used w/a SB Ford or Chev... The top stud of the "new" biscuit would go into your stock mount brackets and for the other end you can fab a mount on the car.

Lou
The donor motor is from a 1985 Dodgr pickup. Can I use those?

Author:  Greg Ondayko [ Tue Nov 02, 2021 5:10 pm ]
Post subject:  Re: Advantages of each of the types of motor mounts?

The '85 truck mounts should be the "spool type" not the biscuit mounts.

Greg

Author:  Rick Covalt [ Tue Nov 02, 2021 6:17 pm ]
Post subject:  Re: Advantages of each of the types of motor mounts?

No the 85 trucks have flat mounts with the safety interlock in case one of them tears. Actually, I'm not sure if the slant 6 truck ever went to the spool type mount ??

I actually use the 85 truck flat mount in my 65 valiant on the D/S.

Author:  DusterIdiot [ Tue Nov 02, 2021 7:35 pm ]
Post subject:  D

D

Author:  MazdaRX8/6 [ Tue Nov 02, 2021 8:05 pm ]
Post subject:  Re: Advantages of each of the types of motor mounts?

Quote:
No the 85 trucks have flat mounts with the safety interlock in case one of them tears. Actually, I'm not sure if the slant 6 truck ever went to the spool type mount ??

I actually use the 85 truck flat mount in my 65 valiant on the D/S.
Is that plenty good for a mild build?

Author:  Rick Covalt [ Wed Nov 03, 2021 3:04 am ]
Post subject:  Re: Advantages of each of the types of motor mounts?

Quote:
Is that plenty good for a mild build?
Sure. I'm running 12's and have not replaced mine. They have been in for 8 years

Author:  Greg Ondayko [ Wed Nov 03, 2021 5:12 am ]
Post subject:  Re: Advantages of each of the types of motor mounts?

I guess I did not realize that the trucks never Changed mounting styles - Sorry about that,


Greg

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