My LST and Muggy Conversion Thread

[JThiessen]

Finally a bit of an update on the design. I decided to try a drop down center plate, and reversed the center diff and motor to get more of the cg to the front. Had to mock up the servo and front shaft to make sure there was clearance. Looks dooable right now. The drop is only a 1/2 inch - could go a little more. My original idea was to get it low enough that nothing was sticking up through the top - but that now seems to be a far fetched idea. I used the muggy center diff set up (1.806" tall).

[JThiessen]

one more pic...ready for the dirt!!!

[JThiessen]

Just a small update: I finally got around to starting some of the assembly.
Got the Diff's rebuilt and installed in new aluminum cups. Used Muggy ring and pinion in them to get the ratio down a bit more to help with spur/pinion choices later on. One thing I noticed is that the gear mesh (ring/pinion)changes rather significantly as I spun the gear. I've never experienced this with the Traxxas and Savage diff's that I have rebuilt.

Installed the diff's into the Hot Racing Aluminum bulks and rear bulk support. Also used Hardcore Racing titanium upper plate, and hinge pin retainers. And of course the Lunsford Ti hinge pins. One of the bulks did not get the holes tapped very well - every one of the fasteners on it was damn tight - even the hinge pins took some extra work to get in. The other side was fine. Also installed the Ti Arms and Dynamite carriers, and the Losi hardened skid plate.

Remember - I'm converting an original LST, so I wasn't prepared for the carrier pins to be too short. Luckily I had two new Muggy A-arms sets, and stole the pins out of those. But after installing them - it looks like they are too long. I used all the shims they gave me, but looks like there should still be more. I'm also not certain that I installed them correctly - should the shims be used on the inside, or the outside? I also did very little shimming on the hinge pins. Should these be kinda loose, or nice and snug (but still allowing the arms to rotate freely)??

[JThiessen]

Those Flextek's sure look nice. Will be interesting to see how the hold up to heavy bashing.
I'm putting this part together so I can get more measurements for the design part - gonna need to get some custom shafts made. Anyone know if mike can do shafts that will mount to the LST style center drive cups?

Gotta order some additional carrier pins for the front, and some XXL carrier bearings. Just about done spending bucks on this thing - I'd hate to add up all that I've spent on it so far - gotta be over a grand so far. Kinda wondering why I even bought the roller in the first place - I think I'll only end up using the shock towers, bumpers, and a couple bearings off it!!!

Couple more pics...

[JAILBIRD]

Originally Posted by JThiessen

Those Flextek's sure look nice. Will be interesting to see how the hold up to heavy bashing.
I'm putting this part together so I can get more measurements for the design part - gonna need to get some custom shafts made. Anyone know if mike can do shafts that will mount to the LST style center drive cups?

Gotta order some additional carrier pins for the front, and some XXL carrier bearings. Just about done spending bucks on this thing - I'd hate to add up all that I've spent on it so far - gotta be over a grand so far. Kinda wondering why I even bought the roller in the first place - I think I'll only end up using the shock towers, bumpers, and a couple bearings off it!!!

Couple more pics...

I ran into the same thing when I put the Dynamite knuckles and carriers on my LST project. The best thing I found were some plastic washers at my local hardware store.

On a side note with the pins, I once saw some that didn't use the e-clips. They were like a shoulder screw and used a nyloc nut. I haven't had any luck finding them again though.

-JB

[JThiessen]

Originally Posted by JAILBIRD

I ran into the same thing when I put the Dynamite knuckles and carriers on my LST project. The best thing I found were some plastic washers at my local hardware store.

On a side note with the pins, I once saw some that didn't use the e-clips. They were like a shoulder screw and used a nyloc nut. I haven't had any luck finding them again though.

-JB

I saw that once too - but can't remember where at.
I actually looked through our shoulder bolts here at work, and none of them in that diameter were long enough.

[JAILBIRD]

Originally Posted by JThiessen

I saw that once too - but can't remember where at.
I actually looked through our shoulder bolts here at work, and none of them in that diameter were long enough.

I ran into the same thing. I even tried McMaster Carr without success. One of my vendors at work makes us custom screws but they have a design fee and a 20k piece minimum order, so that option is out.

-JB

[JAILBIRD]

Originally Posted by JThiessen

I saw that once too - but can't remember where at.
I actually looked through our shoulder bolts here at work, and none of them in that diameter were long enough.

I know this is from a while back, but I finally found those threaded outer pins. STRC makes them.


http://www.teamstrc.com/ebproductdet...mainid=3&id=68

-JB

[pinkpanda3310]

Originally Posted by JThiessen

I decided to try a drop down center plate, and reversed the center diff and motor to get more of the cg to the front. Had to mock up the servo and front shaft to make sure there was clearance.

Am I looking at it wrong or are the chassis rails facing the wrong way?

For more rigidity you could extend the rear skid to connect with the centre. Didn't you pick up a hot racing chassis? you could run that current set up with a similarly low cog. Or is that a an XXL chassis in the mock up?

[JThiessen]

They could be facing the wrong direction. I questioned that when I first modeled them up, and never did get around to double checking that. Its easy enough to flip them around and move the cutouts.

No, I didnt get the HR chassis. Looked at it a bit, then just decided to get the XXL.

Anyone see any issues with reducing the ground clearance in the center with the dropped center? I personally dont think it will be that much of an issue.

[mistercrash]

Originally Posted by JThiessen

Anyone see any issues with reducing the ground clearance in the center with the dropped center? I personally dont think it will be that much of an issue.

Mine will have a lower center skid also and from experience with my E-Revo when it had the kershaw chassis, it didn't cause any issues. As long as the first things to hit the ground are the front and rear skids, it should be fine. If you happen to be so unlucky as to land the center skid directly on a rock from 15 feet or more well, that's just bad luck I'm sure it'll be fine. This design looks great.