bureau13

My '86.5 has a reservoir labeled "Intensive Washer" up front, which appears to route to the headlight washers. The cowl area does NOT have the reservoir which was for what I understood "Intensive Washer" to mean, the special cleaner for windshields. I do have a relay in the intensive washer relay position. I'm not sure how to reconcile all of these things!

Ducman82

earlier cars had the intensive tank up front, THEN the moved it to the back. so yes, you do have that system. basically it is just super cleaner that squirts out, vs normal stuff

Crumpler

If ever there was an over engineered system, it would be this.
I tackled this last year, and it took me hours just to trace the three washing systems.
I remember I made this crazy sketch just to maintain sanity.

Attachment 885083

The headlight washer system is independent from your HI system if I recall.
And your regular wash pump will be inside your engine bay for some reason that I still don't understand.

Nicole

Let's remember that the 928 was conceived more than 40 years ago, when many things, including windshield washer fluids, we're not the same as today. Then, the secondary system made perfect sense.

However, they had to. Are sure the fluid would always be pumped out of the squirrels, not into the other tank, and it won't take forever for the fluid to squirt out. If you have any ideas to re-engineer this and still meet the above requirement, it would be interesting to hear.

dr bob

Since all 928s are owned by doctors and driven by their wives, they will be subjected to commercial car washes. Besides the obvious benefits, those washes often include spray waxes and silicone gloss enhancers. The intensive wash fluid makes short work of those deposits and hazy film on the windscreen. Don't even consider driving without it.

bureau13

I actually don't think any of my various washer systems are functional right now, but good to know I have the fully complex, over-engineered system

Germans! Lol...

Ninjaxz750

Really? I always thought the over engineering was just that. So I really should be using that "stuff" then?

Crumpler

I assume this was for me?
Sorry Nicole, I was 16 when those systems went in my car. Collateral and redundant windshield washing systems with solvents wasn't the first thing on my mind -- if you know what I mean.

Nevertheless, I do think the system was more design then it needed to be, especially for a daily driver in the states. While all my systems are now functional, I have yet to incur visibility concerns by foreign matter or smashed bugs on my headlights for example.

Since you asked, I did modify my system in a few areas.
I pulled the grey squid out of my hood and eliminated a few check valves as per others -- like a dude named Mr. Pirtle:
Attachment 885167

I do not use the original solvent in the high intensity system, which was rumored to take paint off your hood with any prolonged contact.
Instead, I have a cold weather solution loaded in the HI reservoir so any "cross-contamination" of products doesn't pose a "concern". As to the speed to the fluid delivery, no complaints.

In addition, I have relocated the standard washer pump. It is now where god intended it to be -- under the fender and outside the engine bay. In this fashion, I am able to service the pump without pulling my engine...

As others will validate, a purist I am not.

Next on the list of too much engineering: the belt driven viscous clutch fan.

Nicole

You should not laugh about things you don't understand. - Drive on the Autobahn at 130+ mph for a few hours, imagine that the fluid in the 70ies were not like they are today, and you know why this system was put into place at the time.

These cars were used by German businessmen, architects, and engineers to travel long distances at high speeds. Offering a system that cleaned the bugs off the windshield instead of forcing them to stop and do the messy job in their suits was certainly not the worst idea, ever.

uncre8tv

I understand the reason for the system, I've driven on the Autobahn for many hours, I have used simple solutions in my washer reservoir, and I still find this system laughable. There were better ways to do it, there are better ways to 'fix' it today. Let's not trip over ourselves to praise every nut and bolt on these machines.

Rob Edwards

So what's it do to the wax on the hood and roof when the spray blows all over?

whiteNSXs

Totally unnecessary stuff. I have had several 911s, a 630CSi, and a 560SEC which are all Bahnstormers and did not need such silly gimmick. I removed the stuff from my S4 as it turned into some goo.
Steve

Nicole

Having them is one thing. But did you ever drive them on the Autobahn in the 70ies or 80ies, rushing to business appointments in a suit?

The easiest solution to fixing things is always to throw them away...

The Forgotten On

You can simplify the windshield washer system by converting to smaller Honda check valves as is in this thread made by whiteNSXs a few years ago.

https://rennlist.com/forums/928-foru...fications.html

928cs

One of the things missing from a 928 Club-sport.
So, I think even someone at Porsche thought it was not so necessary.