THe NAC Lots-O-BFG KO2 Thread

[foxwar71]

Re: THe NAC Lots-O-Post Thread

Holy shit, Bacon Paradise on travel channel

Sounds way more interesting then Colin or Chris talking about thier dildo stuff.

 

[MoparManiac]

Re: THe NAC Lots-O-Post Thread

In theory, I can re-use my flywheel, clutch, and pressureplate.

I have to see if my father/uncle have a flywheel laying around.

Doesn't look like there's a difference between car/truck or even big/small block flywheels as long as the engines were internally balanced. Makes sense since a lot of the car guys put the magnum truck starters on their cars. (longer lifespan, more compact, higher torque)

Time to start digging through my father's part's stash :laugh:

 

[Begster]

Re: THe NAC Lots-O-Post Thread

Sounds way more interesting then Colin or Chris talking about thier dildo stuff.

I know seriously. I wasn't aware it was the "lots-o-engines-and-adapters-and-colin-trying-to-be-a-mechanical-engineer-thread."

We do have a lots-o-tech thread you know?

 

[Dundy]

Re: THe NAC Lots-O-Post Thread

back to work!

 

[MoparManiac]

Re: THe NAC Lots-O-Post Thread

I know seriously. I wasn't aware it was the "lots-o-engines-and-adapters-and-colin-trying-to-be-a-mechanical-engineer-thread."

We do have a lots-o-tech thread you know?

Yes we do have one.

We've just been choosing to post here forcing you to read it.



I didn't realize giving my opinion on something made me a mechanical engineer. Sweet. Add that to my resume.

 

[XBoBJ]

Re: THe NAC Lots-O-Post Thread

blahhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh

 

[vetteboy]

Re: THe NAC Lots-O-Post Thread

I know seriously. I wasn't aware it was the "lots-o-engines-and-adapters-and-colin-trying-to-be-a-mechanical-engineer-thread."

We do have a lots-o-tech thread you know?

We gave you the opportunity to introduce a new topic last week, and the thread died and had like 4 posts in it all day. :dunno:

 

[Begster]

Re: THe NAC Lots-O-Post Thread

Yes we do have one.

We've just been choosing to post here forcing you to read it.



I didn't realize giving my opinion on something made me a mechanical engineer. Sweet. Add that to my resume.

You and I are arch enemies, are we not?

 

[MoparManiac]

Re: THe NAC Lots-O-Post Thread

I didn't think we were arch enemies.

You just seem to hate me.

:laugh:

 

[Begster]

Re: THe NAC Lots-O-Post Thread

[size=+1]We are now arch enemies!!![/size]

 

[MoparManiac]

Re: THe NAC Lots-O-Post Thread

Don't I have to agree in order for you to say that?

I don't consider you my arch enemy. Therefore we can't be arch enemies.

I can be YOUR arch enemy. But you're definitely not mine.

Sorry dude

 

[kastein]

Re: THe NAC Lots-O-Post Thread

Baller. Forgot that the 4.0 is the same as the 4.2 is the same as the 304/360/401.

Just found a scan of an old AMC factory blueprint. Looks like I'll be spending some quality time in Solidworks later today...

edit: XXXXer! The Y-coordinates are chopped off.

Any chance it has a drawing of the crank flange for the 4.2? I need to make a custom shaft adapter to go from that to the J609B input taper on my generator head at some point and I don't feel like measuring that crap if I don't have to.

I'm not an engine builder, but would a flywheel spacer affect engine balancing?

I would imagine that would be pretty important on something that will see 7k+ rpms.

as long as the spacer is balanced around its axis of rotation I don't see a problem :dunno: I would worry more about the thickness of the adapter plate XXXXing up how deep the input shaft of the trans goes into the pilot bushing/bearing. If there isn't enough coverage I can see the bearing wearing out faster.

Shit, I can get a smoking deal on a 4.0/AW4/NP231 combo but I'm not sure if it will all bolt together i'll have to machine some custom spacers and make custom length driveshafts and cut the floor up a bit and call Dannys BS adapters XXXX this just keeps getting harder

seriously man. PS I have an ultra rare factory 4.0 to AW4 bellhousing available for sale if you end up needing it.




Stuck in NYC again. Welp... I drained the pipes, drained the toilet cistern, and poured some whiskey in my toilet bowl before I left to keep it from freezing :gee:

 

[vetteboy]

Re: THe NAC Lots-O-Post Thread

Any chance it has a drawing of the crank flange for the 4.2? I need to make a custom shaft adapter to go from that to the J609B input taper on my generator head at some point and I don't feel like measuring that crap if I don't have to.

No it doesn't, but I have one sitting on my back porch at the moment. If it doesn't have the goofy offset hole like a 4.0 crank it'd probably be pretty easy to measure.

 

[kastein]

Re: THe NAC Lots-O-Post Thread

No it doesn't, but I have one sitting on my back porch at the moment. If it doesn't have the goofy offset hole like a 4.0 crank it'd probably be pretty easy to measure.

It's pretty boring, just some diameters, and 6 1/2-20 holes iirc. The holes are not in a symmetrical pattern though to keep the flexplate or flywheel from being mounted wrong. I don't really need their positions since I'll be using a flexplate to mark the azimuth of each hole, just the offset from center. If it's not in the blueprint don't worry about it though, I have a couple 4.0s in teh yard that I can measure when I get home.

 

[vetteboy]

Re: THe NAC Lots-O-Post Thread

Actually I'll probably measure it anyway as it pertains to my project as well.

The SHO motor uses 8 symmetrically spaced holes. I wonder how badly the two patterns will step on each other.

 

[kastein]

Re: THe NAC Lots-O-Post Thread

I *think* only 1 bolt hole is misaligned and the rest are on 60 degree increments, but don't quote me on that.

if so, you have:
0
60
120
180
240
300
???

for offsets on the 4.0 pattern, and:

0
45
90
135
180
225
270
315

for offsets on the SHO pattern.

Assuming they're at the same diameter, 0/180 line up... I bet 120 and 135 are gonna be a problem, so will 225/240, and 300/315.

How much space do you have to work with lengthwise? Any chance you could make the adapter plate thick-ish, and a crank adapter that has a SHO size flange/bolt holes/pilot on the 'male' end, and a Mopar pattern on the 'female' end? Maybe make a part with a large flange and dual 8 bolt patterns (SHO and one larger, around it) and another flange adapter that has the larger 8 bolt pattern and the Mopar pattern inside that, then bolt the two together? Not sure how I'd go about adapting patterns like that without ending up with a really thick adapter.

 

[ktm racer 419]

Re: THe NAC Lots-O-Post Thread

weld them together. problem solved

 

[vetteboy]

Re: THe NAC Lots-O-Post Thread

From a convenient picture showing an SHO flywheel with a tape measure laid across it, the bolt pattern looks to be approximately 8 on 70mm (~2.75").

I forget what the 4.0 one looks like, or if it's close to that.

If it *is* that close, then I just get the existing holes filled and machine the SHO bolt pattern into it, and use a spacer with thru-holes if I have to.

 

[kastein]

Re: THe NAC Lots-O-Post Thread

ahh, I wasn't even thinking of just filling the original pattern in. Figured you'd want that to be bolt-together with all factory parts on both sides for some reason.

 

[MoparManiac]

Re: THe NAC Lots-O-Post Thread

From a convenient picture showing an SHO flywheel with a tape measure laid across it, the bolt pattern looks to be approximately 8 on 70mm (~2.75").

I forget what the 4.0 one looks like, or if it's close to that.

If it *is* that close, then I just get the existing holes filled and machine the SHO bolt pattern into it, and use a spacer with thru-holes if I have to.

I think the 4.0 one was wider than that, like closer to 4".