Momo Hub, Momo Hub for Early '73 2.0-S Options

[infraredcalvin]

Good thing you cancelled the 8002, I got one from rennline (solid) for my 71 race car, it fits but it sticks off the column about 1/2 an inch. The metal collar shown previously for a ‘71 prevents it from seating all the way down... the deep hub shown by sixnotfour is the correct part although I’m curious how far it extends the steering wheel, mine is almost too close (but tolerable) to the blinker switch when using a newer prototipo.

I was going to source or make an aluminum collar to fit, but pretty low on the priority list.

Please post pics of what you get from classicgarage, I don't need a horn so I all I care about is fit, would be miles ahead if it puts the wheel in the same place as the 8002.

[raynekat]

Good thing you cancelled the 8002, I got one from rennline (solid) for my 71 race car, it fits but it sticks off the column about 1/2 an inch. The metal collar shown previously for a ‘71 prevents it from seating all the way down... the deep hub shown by sixnotfour is the correct part although I’m curious how far it extends the steering wheel, mine is almost too close (but tolerable) to the blinker switch when using a newer prototipo.

I was going to source or make an aluminum collar to fit, but pretty low on the priority list.

Please post pics of what you get from classicgarage, I don't need a horn so I all I care about is fit, would be miles ahead if it puts the wheel in the same place as the 8002.

Will do....

There are all manner and thicknesses of spacers that you can use with Momo wheels. They come with longer screws and I've used them in the past. Easy and effective.

[Beach914]

luisi model S5904

http://classicgarage.com/s5904.html

I have the same one but haven’t fit it to my car yet. Would be nice to know that it works. Not really caring about a horn and can live with wiring up a separate button.

[Chi-town]

Easiest way to tell an early column from a late column in a -4 is by if the wiper switch is on the column. If it is it's a late column, if it's not it's an early column. (Does not apply to -6!)

The 8002 is the correct adapter for the late column. The solid one is no longer being made my Momo (called them to ask), the collapsible unit is still available.

If you need an early adapter:
https://www.ebay.com/itm/Steering-Wheel-Ada...lsAAOSwWqtdqChq

If you need a late one:
https://www.ebay.com/itm/Steering-Wheel-Hub...~EAAOSwhcJWKKA6

I have the late one and it's a nice piece, well made and fits both my Nardi and Momo bolt patterns.

[sixnotfour]

https://www.ebay.com/itm/Steering-Wheel-Ada...lsAAOSwWqtdqChq

This doesn't fit a 1970 Porsche 914

[raynekat]

https://www.ebay.com/itm/Steering-Wheel-Ada...lsAAOSwWqtdqChq

This doesn't fit a 1970 Porsche 914

I absolutely agree....no way that will fit an early 914-4. Looks more like the adapter I have for my 73 911.

[raynekat]

The hub adapter kit showed up today from Classicgarage.com.

It's a good new/bad news story.

The good news first.
All the parts "look" good, but looks can be deceiving as they say.
The company that makes these is Luisi out of Italy.

I ordered the S5904 that is supposed to be for 69-71 914's.

Here is a pic of the parts you get.



The silver ring that the horn button is supposed to snap into has an ID that is too big to accommodate a standard Momo horn button.
Luckily most Momo wheels come with the correct silver ring that has the right ID for your horn button. Issue dodged there.

The adapter itself slides onto the column splines correctly and pushes on just right.
There is no big gap between the backside of this hub and where it meets up to the rest of the column.

Now comes the deal breaker to me....
See pic below.



The hole where the spring loaded contact pin is supposed to go is way too far inboard.
See yellow arrow.
The location for the contact pin needs to be a good 1/4 - 3/8" farther out.
Where it's located now, the pin won't ride on the copper contact ring but on the screws that locate the ring.
That's just not going to work.
Your steering wheel will either stop turning when the contact pin hits one of the contact ring screw heads.....or you'll just shear off or bend the contact pin.
Nice!
If you look at the Momo 8000 pictured in post #16, you can see that the contact pin on that hub is outboard much farther than where the Luisi hub contact pin location will be.

Time to come up with another solution as the correct Momo 8000 hubs are NLA.
Modifying a stock wheel might be an option except that they are very expensive being so much like the RS wheel everyone wants.

[sixnotfour]

Idea; encapsulate the plunger in epoxy in the correct location ??? (IMG:style_emoticons/default/blink.gif) (IMG:style_emoticons/default/idea.gif) (IMG:style_emoticons/default/popcorn[1].gif)

[raynekat]

Idea; encapsulate the plunger in epoxy in the correct location ??? (IMG:style_emoticons/default/blink.gif) (IMG:style_emoticons/default/idea.gif) (IMG:style_emoticons/default/popcorn[1].gif)

That's a good idea....hey I had that idea as well.
Not sure the geometry of the hub will allow this.
It has a waist like a woman...the hub that is.

I'm thinking about a different direction.
Possibly a redesigned copper contact ring....or a contact ring from a 911.

[horizontally-opposed]

It doesn't look like the old Momo hub would be all that hard to replicate—914 Rubber or another vendor to the rescue?

I wish I had kept my extra, but it was just gathering dust. Had a sense they were thin on the ground, but not this thin.

[sithot]

It doesn't look like the old Momo hub would be all that hard to replicate—914 Rubber or another vendor to the rescue?

Pete:

I'm in but without even considering liability issues I think it would be a low volume loser. For what would have to be charged I'm guessing most 914 owners will go the collapsible route.
Find some enthusiastic young car nut in engineering school. The school in question should have enough clout to own 3D scanners, 3D printers and a CNC machine. There's your hub. (IMG:style_emoticons/default/beerchug.gif)

You can always ask Jay Leno. He's got "the stuff" in his garage. (IMG:style_emoticons/default/pray.gif)

[raynekat]

Ordered a 3" 18 Ga copper disc today.
Will attempt to make a custom horn contact disc for my car.
Need a 1.5" ID hole in the middle plus a few small holes on the perimeter for mounting and it might just work.

I like the Liusi hub....just the horn contact pin is located incorrectly in their design.
Stay tuned.
I was going to try using the horn contact ring off a 911, but I'm not sure it's any better than the 914 ring I currently have.

[sixnotfour]

cool, (IMG:style_emoticons/default/beerchug.gif)

[horizontally-opposed]

It doesn't look like the old Momo hub would be all that hard to replicate—914 Rubber or another vendor to the rescue?

Pete:

I'm in but without even considering liability issues I think it would be a low volume loser. For what would have to be charged I'm guessing most 914 owners will go the collapsible route.
Find some enthusiastic young car nut in engineering school. The school in question should have enough clout to own 3D scanners, 3D printers and a CNC machine. There's your hub. (IMG:style_emoticons/default/beerchug.gif)

You can always ask Jay Leno. He's got "the stuff" in his garage. (IMG:style_emoticons/default/pray.gif)

Muuuuwah. Yeah, the "L" word probably makes this a loser all by itself. (IMG:style_emoticons/default/sad.gif)

Would be interesting to know if someone could "print" a blank with a plan that could be finish-machined by the end user? I dunno. Just trying to come up with a solution.

The collapsible adapters certainly look like the safer call, though not sure how much safer or less safe either Momo hub with a Momo wheel is vs the stock wheel with nothing collapsible at its hub?

[raynekat]

So here's the problem with the Luisi hub.
It all fits great and looks fine.
The problem is where the hole for the horn contact pin is located.

From the pic, you can see the center of horn pin contact hole is about 2.5mm from the center of the hub.

[raynekat]

As compared to the factory wheel/hub which has it's horn pin hole about 3.5mm from the center of the hub.
Is that a problem with the Luisi hub?

[raynekat]

Well it is a problem when you consider the horn ring contact that is in the steering column.
You can see where the factory pin rides up on the most out part of the ring.
With the Luisi placement, the horn contact pin would ride in the same area where the 4 holes for the screws reside that hold the contact ring into the steering column.

You'd either bend or break off the horn contact ring as you turned the steering wheel when the pin would hit the heads of the screws on the contact ring.
Or you might not even be able to turn the steering wheel as the contact pin hit the screw heads on the contact ring.

Not a good thing in either way....



You can see the issue in the below pic.
The location of the contact pin is not far enough from the center of the hub.
In fact, you can see the hole just peaking out towards the center of the hole of the contact ring (yellow arrow).

[infraredcalvin]

How about moving the screws outward and filling the holes on the inside ring?

[sixnotfour]

(IMG:style_emoticons/default/sawzall-smiley.gif)

[raynekat]

Gave up on the Luisi hub.
It's not going to fit my 71 914-4 although the shop that sells them swears they've sold a lot of these and no one has ever had a problem? What?

Fast forword to today....
I bit the bullet, found and purchased a Momo 8000.
It fits great out of the box.
It was necessary to tap the 3 holes on the backside where the turn signal cancellation ring fits.
Done.
My only issue was trying to ground the horn button to the inside of the hub.
The Momo horn button I had in hand had 2 electrical connectors.
The Momo 8000 hub has one wire.
Something doesn't translate here.
For now I just snuck a wire underneath the large washer/nut that holds the steering wheel on.
Put that wire on one of the horn button connectors and the wire from the hub to the other horn button connector.
We have a horn.

How have other people completed the circuit for the Momo horn button?