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MazdaRX8/6
PostPosted: Mon Nov 01, 2021 8:17 pm 
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3 Deuce Weber
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Car Model: Mazda RX8 slant six swap
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.
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Badvert65
PostPosted: Tue Nov 02, 2021 4:59 am 
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Turbo EFI
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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.

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Dart270
PostPosted: Tue Nov 02, 2021 6:04 am 
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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

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MazdaRX8/6
PostPosted: Tue Nov 02, 2021 4:46 pm 
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3 Deuce Weber
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Car Model: Mazda RX8 slant six swap
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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?
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Greg Ondayko
PostPosted: Tue Nov 02, 2021 5:10 pm 
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The '85 truck mounts should be the "spool type" not the biscuit mounts.

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Rick Covalt
PostPosted: Tue Nov 02, 2021 6:17 pm 
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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.

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DusterIdiot
 Post subject: D
PostPosted: Tue Nov 02, 2021 7:35 pm 
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D


Last edited by DusterIdiot on Sat Nov 09, 2024 12:48 am, edited 1 time in total.

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MazdaRX8/6
PostPosted: Tue Nov 02, 2021 8:05 pm 
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3 Deuce Weber
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Car Model: Mazda RX8 slant six swap
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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?
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Rick Covalt
PostPosted: Wed Nov 03, 2021 3:04 am 
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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

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Greg Ondayko
PostPosted: Wed Nov 03, 2021 5:12 am 
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I guess I did not realize that the trucks never Changed mounting styles - Sorry about that,


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