'90 W250--'89/91/92 Ramcharger

[Tacoclaw]

I squeaked this one for $370 shipped, so it was around the higher end of the low spectrum. Honestly I'm not too sure of this thing's viability in a truck that's doing much more than DD-ing and occasional playing. It just doesn't put out the volume for an engine our size without spinning its guts out, and getting it to spin its guts out is tough to do in the space allowed. Carl has his pulleys custom made, at over $200 a pop to get the RPMs.

The smallest pulley I've found for this thing is 2.49", and you have to end it off to get machined and the pulley pressed on by the company which costs $250 plus shipping there and back. Even with a 6" diameter crank pulley running off the fan idler, that would just get me to 4:1, which I feel is the minimum you'd need to get this thing to work as well as it can. I'll see what I can make happen with the stock pulley, then decide from there.

Guess there's only one way to find out.

My next step is to locate the biggest 8-rib pulley I can find and see what the odds are of getting it to fit.

:Edit: Jesus, I suck at math...

Here's Carl's quote on his gearing...

the stock crank hub is 6.5" the stock fan pulley is 5" a 1.3:1 drive ratio. The pulley I had made is a 6" and the MP90 has a 2.2" a 2.27 ratio. 1.3 X 2.27 = 3.54 final drive ratio.

I'm thinking at 3200rpm we'd need t have it at ~12k, I think they're rated to 15K sustained, but I just don't see a way to turn them that fast.

[oldestof11]

A smaller pulley on the charger or bigger on the engine side.

[Tacoclaw]

If only I had known it was that simple!!!

[PToombs]

All you gotta do is ask buddy! You should know that!

Then you need to sort thru about 8-10 posts to weed out the BS and smartassedness and you're all set!

[oldestof11]

WTF is up with the normal title?

[Tacoclaw]

I'm actually debating on trying to make a pulley on the lathe, how hard could it be? If nothing else it'll help burn up some time while I wait for the manifold to get here.

Well, besides how long it took me to find a piece of 5" roundstock to make the DP adapter.

I'm out of ideas, Jon. I'll think of something when I get back in action with it.

[dazedandconfused]

We have a whole thread full of names for you.

[Tacoclaw]

I saw, they're pretty good, but it just feels wrong to steal them. "Dude, where's my turbo" was pretty tough to ignore.

I was thinking more along the lines of. "You no want turbo, you want hotpocket!!!

[RCCUMMINS89]

Damn.... I want a hotpocket, just got back from the grocery store and didn't buy any either.

[Tacoclaw]

I'd heard the Jungle shackles were pretty beefy and all, but I had no idea they were like this.



Look at that damn thing, I'd bet the frame will tear in half before anything happens to it.

I also developed a slight vibration the other day going down the interstate. it just happened within one day, so knew it wasn't a u-joint, but after my2nd back massage I decided to check it out.

Hmmm... Guess I shouldn't just focus on the steering stuff when I grease, huh?

[dunes450r]

dam, that looks a little worn!

making a pulley isn't hard at all, the hardest part (and one i don't know) is how the pulley attaches. you mentioned it being pressed on, who knows. if you want to spin it to 12k, it had better be well balanced, which it will be as long as you cut every diameter in one setup on the lathe. let us know if you make one!

[Tacoclaw]

Honestly, my only thought so far is to take a piece of 8" pipe and bore the inside of it round, then machine a thick-ish piece of roundstock that fits inside of it, weld them as straight as I can, then take the whole mess to the lathe in one piece and machine it into a pulley as one chunk. I figure I could get my backspacing close and then make a spacer to put it exactly where I needed it.

8" is honestly a little optimistic, but its a pipe size I know we have at work so I can get my OD. I don't know if I have the room for it, but it'd be nice to be able to have one tha big so I don't have to go crazy on the blower pulley.

[Tacoclaw]

8" is honestly a little optimistic

#1,That's what she said.

#2, I just realized you are talking about the blower pulley. I'm more interested in getting the biggest possible pulley on my fan hub, that would save me the headache/$$ of messing with the blower pulley. Plus it would give me a lot more options on blower pulley sizing than just having to go to the smallest possible to get what I need.

[revemup15]

Taco when you gonna get shackle brackets on? I been wanting to do this also and wanted your feedback after you put some miles on the setup

[PToombs]

after you put some miles on the setup

I hope you aren't holding your breath! Go back and see when the truck project was started and see the progress he's made on that?

I will give him an attaboy for trying, he's not afraid to tear into something and boldly go where no man has ever gone before.

I know, lets call it the USS ENTERPRISE!