Cummins 4BT & Diesel Conversions Forums banner

1 - 20 of 406 Posts

·
Registered
Joined
·
7 Posts
Discussion Starter #1
Well, I'm sure this will be a very popular subject here so why not start a thread to give some ideas for fabbing or adapting motor mounts? I myself am interested in pics of adapting Fluid mounts to a 79 Dodge Ramcharger Crossmember... Though any pics/info about mating the mounts to any 80's Dodge/Ford/Chevy crossmembers would be greatly appreciated too! Thanks.

Michael
 

·
Registered
Joined
·
126 Posts
Here is a set of Bolt on GM mounts ..years 1990-1977 Blazer and Suburban, the old square style trucks IIRC that I passed on.. ( I was a dumb a**- New crate Motor, GM mounts, GM adapter and Flywheel etc) for $3k:frown: only if I could do that over again..

If I recall someone here in the west still makes this set for $299 I'll see if I can find the source.



Berg
 

·
Registered
Joined
·
38 Posts
my mounts

here is a top passanger side picture of my mount these were weld up with a lincoln sp125 mig but i am going to reweld everything with my ranger 8 gas powered stick welder for a better weld and penatration
 

Attachments

·
Premium Member
Joined
·
184 Posts
To Skyhookdutch

How do the jeep motor mounts hold the weight of the 4B? I had thought about using them (in urethane) but at a slightly more upright angle because of the weight. No flame, just curious. With your MIG, are you using flux-core or gas? Mix or straight Argon?
 

·
Registered
Joined
·
13 Posts
those look pretty stong, what is that a picture of, cant tell what kind of vehicle it is. How do the vibration isolators work?
 

·
Registered
Joined
·
38 Posts
So far the mounts are working great, hardly any vibration really. The only thing noticable is when you shut the engine down. I have them at that angle as there isnt much room to work with. With the mounts built at that angle it works like a craddle. I like the design of Mikes mounts and almost went with something like that, but i would have a lot of metal hanging below the frame rail and i wanted to keep it to a mininum.

If you start up the cummins in a p30 you can get a bit of movement side to side on the mounts and vibration out of the engine. Running my frame mounts at a angle you can almost eliminate the side to side movement as the weight of the engine is pushing out and down on the engine mounts rather than straight down. I have another jeep with a 4bta in it that is in the midst of being built and i used almost the same design except for a solid 1 inch rubber mount between the frame mount and engine mount. I will try to get some pictures of them up this week.

As far as my mig setup it is solid wire with a mixed shield gas 75% argon, blah blah.... .But i still prefere my ranger 8 stick
 

·
Registered
Joined
·
7 Posts
Discussion Starter #12
Welding or Bolting?

Looks great guys! Got a question though, do you think it's better to weld your frame mounts to the frame, or do you think it's better to use grade 8 bolts and bolt them to the frame?

Also, it looks in those pics like there's no crossmember. What would you propose I try to duplicate using my '79 RC frame? Remove the crossmember and do the frame mounts, or fab something up to the crossmember? Thanks.

Michael
 

·
Registered
Joined
·
1,366 Posts
those look pretty stong, what is that a picture of, cant tell what kind of vehicle it is. How do the vibration isolators work?
Hello,
As Tacoma said, this is a M715 that I'm turning into a 6x6. That picture is fairly old. I have switched the 4BT in favor of a 6BT (the 4BT will be going into a lighter vehicle) and I'm in the process of building new motor mounts now.
I didn't have a crossmember under the 4BT, but I will make one for the heavier 6BT.
A couple of old pics... A big deal of this has been undone, specially the rear suspension(s), to mimic that of a duece and a half's. Just don't tell the guys at the M715zone :biggrin:



 

·
Registered
Joined
·
38 Posts
block mounts

Those are from a amc kit from advance adapters, I had a amc 401 in this jeep at one time and bought a weld in kit from a.a. and I hung on to them when I sold the 401 and just redrilled the holes to fit the 4bt block. I may duplicate them if I pull my jeep back apart, but they are very basic flat stock with three holes in them and 2 ears to bolt up the rubber mounts to. I think i paid 160.00 for the kit from a.a. and that included the frame mount, new rubber triangle mounts and the block mounts. But they would be very simple to duplicate!
 

·
Registered
Joined
·
43 Posts
I can't get jeep motor mounts to last under their stock app. of a 4.0L I-6 so I wont be using them.

For refrence motor mounts from a late 70's D300 with a 440 BB are the same as those for a 6/4BT the flat single studded mounts.
 

·
Registered
Joined
·
38 Posts
I agree they may not be the best designed isolators but when bolted down flat there is a lot of side to side movement in them, the way i built my mounts they are at a angle and the weight of the engine is pushing down and out instead of straight down and leaving lots of room for side to side movement for flopping around.
 

·
Registered
Joined
·
43 Posts
I agree they may not be the best designed isolators but when bolted down flat there is a lot of side to side movement in them, the way i built my mounts they are at a angle and the weight of the engine is pushing down and out instead of straight down and leaving lots of room for side to side movement for flopping around.
I can see how that could work, they definately don't offer much when mounted flat.....how about the beefed up jeep mounts sold on the net?
 
1 - 20 of 406 Posts
Top