Motor Mount options on magnum swap
#1
Motor Mount options on magnum swap
Ok I thought I knew what I was doing, and have read all the threads that come up in searches, but I'm still confused.
I'm doing a 3.9L to 5.9L magnum swap in my 90 vert. The 3.9L had the 4412141 adapter plates and the urethane barrel motor mounts. I thought the 5.2/5.9 was simply the 3.9L extended. The motor mount spots on the 5.9L measure the same distance to the back of the motor as the 3.9L so the extra distance is pushed forward as we all know (reason for pusher fans).
However, these 4412141 adapter plates in no way line up with the mounting holes on the 5.9L. So what do I need that will mount to the 5.9L block and allow me to use the 3.9L urethane barrel mounts?
I'm doing a 3.9L to 5.9L magnum swap in my 90 vert. The 3.9L had the 4412141 adapter plates and the urethane barrel motor mounts. I thought the 5.2/5.9 was simply the 3.9L extended. The motor mount spots on the 5.9L measure the same distance to the back of the motor as the 3.9L so the extra distance is pushed forward as we all know (reason for pusher fans).
However, these 4412141 adapter plates in no way line up with the mounting holes on the 5.9L. So what do I need that will mount to the 5.9L block and allow me to use the 3.9L urethane barrel mounts?
#2
Ok I thought I knew what I was doing, and have read all the threads that come up in searches, but I'm still confused.
I'm doing a 3.9L to 5.9L magnum swap in my 90 vert. The 3.9L had the 4412141 adapter plates and the urethane barrel motor mounts. I thought the 5.2/5.9 was simply the 3.9L extended. The motor mount spots on the 5.9L measure the same distance to the back of the motor as the 3.9L so the extra distance is pushed forward as we all know (reason for pusher fans).
However, these 4412141 adapter plates in no way line up with the mounting holes on the 5.9L. So what do I need that will mount to the 5.9L block and allow me to use the 3.9L urethane barrel mounts?
I'm doing a 3.9L to 5.9L magnum swap in my 90 vert. The 3.9L had the 4412141 adapter plates and the urethane barrel motor mounts. I thought the 5.2/5.9 was simply the 3.9L extended. The motor mount spots on the 5.9L measure the same distance to the back of the motor as the 3.9L so the extra distance is pushed forward as we all know (reason for pusher fans).
However, these 4412141 adapter plates in no way line up with the mounting holes on the 5.9L. So what do I need that will mount to the 5.9L block and allow me to use the 3.9L urethane barrel mounts?
http://www.justparts.com/Auto_Parts/Engine-Mount-Bracket-3-9-Liter-88-Dodge-Dakota-4638577-4412141/24714292
I'm really confused now because that part seems to be only for an 88 dak. And I can't find my type of mounts anywhere on line.
#4
2WD
Here's a pic of it on the old 3.9 block before I removed them...you can see that adapter plate under the bushing mount....But I can't find anything like this online
That upper bracket headed to the left is a transmission bracket...haven't seen that arrangement either.
Here's a pic of it on the old 3.9 block before I removed them...you can see that adapter plate under the bushing mount....But I can't find anything like this online
That upper bracket headed to the left is a transmission bracket...haven't seen that arrangement either.
Last edited by robertmee; 04-06-2016 at 09:05 PM.
#6
Pic of a number on the bushing...4412140 which shows up as a Dodge motor mount, but not the same pictures when I search it
Example on search: http://www.ebay.com/itm/Engine-Motor...-/261523192603
Example on search: http://www.ebay.com/itm/Engine-Motor...-/261523192603
Last edited by robertmee; 04-06-2016 at 09:20 PM.
#7
FYI, my 1990 service manual shows the exact above.
Here are two pictures
The 3.9L mounting holes are shown in a triangle (yes the pic is an inline 4 block, but it's the same mounting hole configuration on the 3.9L)
The 5.9L mounting holes I thought I could use in an upside down triangle
Problem is the vertices of the triangle are longer (holes further apart) on the 5.9L than on the 3.9L. The distance from the center of the mount to the tail end are the same.
Here are two pictures
The 3.9L mounting holes are shown in a triangle (yes the pic is an inline 4 block, but it's the same mounting hole configuration on the 3.9L)
The 5.9L mounting holes I thought I could use in an upside down triangle
Problem is the vertices of the triangle are longer (holes further apart) on the 5.9L than on the 3.9L. The distance from the center of the mount to the tail end are the same.
Last edited by robertmee; 04-07-2016 at 03:44 PM.
Trending Topics
#8
So, I think I figured it out!
After looking more closely at the adapter, it has two interlocking triangles! One set is tapped and the other set is through hole. So as it turns out, if you orient it correctly, the through holes line up with the magnum mounts, and the tapped holes line up with the motor mount.
After looking more closely at the adapter, it has two interlocking triangles! One set is tapped and the other set is through hole. So as it turns out, if you orient it correctly, the through holes line up with the magnum mounts, and the tapped holes line up with the motor mount.
Last edited by robertmee; 04-07-2016 at 06:00 PM.