tempest411

Hello,

It seems the wiper motor out of 996s can be retrofitted without too much trouble into 944s. For those that have done so, did it offer better performance compared to the original, even a well-functioning original? I took mine apart on my 924S and was disappointed to find that it wasn't full of rust and solidified grease at all. It looked much newer than the rest of the car in fact. I was hoping I could look forward to cleaning everything up and enjoying much better performance from it, but alas, cleaning the connections and re-greasing the gear may have perked it up slightly, it's still pretty anemic compared to most other cars I've had. Only my old Ford truck is worse! Would a motor assembly off a newer vehicle like a 996 help in this regard?

Thank you for your advice!

fasteddie313

Sub

Zirconocene

Going from memory, there is a little bit of fettling needed for the new motor case, and you'll lose the intermittent function, if you have it. I might have that thread bookmarked somewhere, which would be helpful, but that's what I remember.

Cheers

tempest411

Why would the intermittent function be lost? The intermittent functionality is in the motor assembly itself. All it needs is a momentary +12V pulse to get the motor off the park position and the 'contact wheel' does the rest. I'll order one of these and fiddle with it. I'm hoping it spins up faster, and doesn't syruggle so much at highway speeds like my OE one does.

Zirconocene

Let me see if I can find that thread. I hope I'm not steering you wrong about this. Maybe this was from a 928 thread... I'll do some searching and update if I find something.

ETA: Here's the thread that I remembered: https://rennlist.com/forums/924-931-...-996-part.html
ETA2: Here's the other thread (that you were also on) that didn't seem to come to any good conclusions: https://rennlist.com/forums/924-931-...natives-3.html

Cheers

Tiger03447

Would a 928 wiper motor work? Just spitballin' here..

Zirconocene

An update from me: I drove my 996 into work today, in the rain (I know, I know, but my DD is laid up with a suspension and brake upgrade) and there does appear to be an intermittent setting on the wipers. However, it does not look to be adjustable. I have no idea how the motor handles that intermittency (?) but it looks like there might be a way.

Cheers

tempest411

The wiper motor need only have a park position built into it (like every wiper motor ever) to have an intermittent feature, adjustable or not. All that happens when your stalk is in the intermittent position is send a short duration signal to the wiper motor to run it just long enough to move off the park position, where the motor will automatically run until it gets back to the park position. When this feature is adjustable there is a timer circuit in a module under the dash somewhere that lets you adjust the duration between those short pulses. I think European cars may have been late to the game on that part. My wife's old '98 Mercedes has intermittent wipers, but they aren't adjustable either. But then by about 2000 cars they started using rain sensors. Our '03 BMW X5 has an 'automatic' intermittent feature because of this.

I have ordered a used 996 wiper motor assembly. Once I map out what leads do what, and do the same with my 924S I'll give it a try.

Roka

I literally put a brand new 996 motor in my 87 S this weekend after the original motor could no longer move the wipers along the glass.
There is some filing that needs to be done in order to fit it into the wiper mechanism but it works like a charm, so quiet it's amazing.
The motor itself has only two speeds (low/high) so you do lose the third speed but the intermittent function works flawlessly.

16again2009

Is it faster than the original?

Zirconocene

@tempest411 : I'd love to see what you come up with. In the 2nd link that I posted, down near the bottom of the thread, there was someone that identified most of the wires, if that help you avoid some tracing. I feel okay about wiring projects but understanding the circuitry sometimes fries my brain, so I'm glad you have a handle on it and, like I said, would love to hear more about what you find. I'm sure the rest of the commentariat here, now and in the future, will also benefit.

Cheers

jeyjey

The filing of the crank and bracket shown in that link suggests the spindle doesn't protrude through the bracket as far.

I wonder if milling down the 3 bosses for the mounting screws to get it to protrude farther wouldn't be a neater solution. (Assuming the motor itself doesn't foul on the bracket then. And of course, assuming you have access to a mill.)

uniquenamehere

Very interested in the results here... i think i'm heading to a wiper motor replacement soon too.

Roka

Hard to tell since my original never worked properly to begin with but it is pretty much in line with any modern car I own.

tempest411

Milling down the posts is mentioned in one of the threads I found on retrofitting a VW motor. It seems this basic motor assembly is used on countless vehicles.