I apologize for my ignorance, but I still don't know what CIS system means. I guess I never had one. Does it mean Carburator Induction System? I could use a little education so I can get the Raw, Tobs joke on the Pnutz. Thanks for any help...

Constant Injection System by Bosch, 'CIS'
It was a early, relatively inexpensive fuel injection system specifically designed for gas engines.
It constantly squirts fuel into the intake system right before the intake valve. Hence the name.

Thank you ficke! So I still wonder why pmax is so hell bent on such a system. Does he have 50 of them in stock and for sale?

I have no idea what drives pmax. I am not sure he knows.
Each of the these induction systems have pros and cons, the main driver of the CIS system was to meet the standards of the new emission laws. The Mechanical Fuel Injection, MFI, that preceded it was a modification of a diesel injection system, it was more expensive more temperamental and does not have the durability of the CIS system but it was better for performance.
Now we of course use computer controlled Electronic Fuel injection, EFI, systems, which are almost better in every way, they are constantly adjusting for fuel quality, air density, engine temp, etc. all the time except for the complication and reliability associated with the sensors and the quality of the electronics, EFI is hard to beat, kind of like a limp ..., well Ronny could explain that better.

Thread looks like it's done.

no way.

bump!...

OP hasn’t been here in a few days. Let it drop.

This is what I am talking about, "threads looks like it is done" ? why? explain? what makes you say that?

All that takes to correct is a Blue Bomber or three (aka - boost!). At least that's what pNutz claims! :eek:


Bump!!!

Mechanical fuel injection, 'K' stands for German: "Kontinuierlich", meaning continuous. Commonly called 'Continuous Injection System (CIS) in the USA.

Bernz, just to add a little to what IckyFicke and RawhideRey said about CIS (aka - Bosch K-Jetronic); pNutz is fond of the system because it is an old school (like his old ass!!!) injection system that performed well enough that it was on many European cars for decades (Porsche, Saab, Lamborghini, just to name a few, and hell, it was even on the snail slow Delorean with the Vulvo lawnmower engine). Also, that bisch pNutz has really studied the system over the past several years and is quite knowledgeable with regard to how it works, what the components are and do, and how to troubleshoot problems with it. Plus, Nutz is just weird like that!!! :D

CIS sux for several reasons, however. For one, it is entirely user untuneable in stock trim (except for idle AFR/CO level) - the only way for an owner to optimise the system is to have components re-engineered to be made adjustable. There are people that do this, but it is not cheap, and then learning to tune the system requires an onboard AFR meter and a lot of work and patience. Another suck is that even the slightest air leak anywhere in the intake tract (talking even a tiny, pNutz's d**k sized leak :eek:) means the engine will run like an old dog with chronic explosive, and dribbling, diarrhea, and then locating said leaks (often many all throughout the system) is a real chore. Related to that suck, the non-Turbo 911 variants utilize a complex airbox that is made of fookin plastic which splits wide open (aka - rendered useless) if there is an intake backfire (not uncommon during cold startup on the non-Turbo systems).

All of the aircooled Turbos ran CIS (except for the 993TT), so I am very familiar with the pain in the assery of it, and have gone to a lot of effort and $$$ to be able to properly tune the system (does not supply enough fuel during boost to support a better turbocharger than the weezy piece of shiit that the cars came with, runs borderline too lean at idle, and dumps too much fuel at boost onset). I've also become pretty good at troubleshooting it, unfortunately! I don't have actual hate for the system, but I have no love for it either, and definitely like poking fun at how long Porsche continued to use it on the Turbos.

And then you have Toby, who ditched his CIS for and even ruder and cruder fuel system - Caveman Carbs! :eek:

:D

well, ol seany-nutz will wait for it to fall to mid page two and bump it for no good reason other than the little chuckle it will give him thinking he's funny. he just wants it to fall so he can do his resurrections thing providing the subsequent erection such non-sense gives him..



that about sums it up. one thing I will hand to the CIS system was that it provided more HP from six flat cylinders than many V8's from US auto manufactures could muster in the mid to late 70's.

when seany-nutz does his CIS research and tuning this is what you will see.





http://forums.pelicanparts.com/uploa...1574181218.png

As a high altitude dweller, I can tell you that CIS is more flexible than both carbs and MFI in various altitudes. One can take the car from “down” here at 5000’, up over Vail Pass at double that, and then drive on to down near sea level in Vegas with no retune or drive ability issues.

Cis
 

I worked on a 76 934 that had CIS when I was a shop foreman for Herman & Miller P/A in 1976.Worked great and made about 490 HP.It new was a brand car.Fred

Let's have a look.

First, what MM said ...

then given the caveman

... and half of the Bern vs amg show has already shown up ... you not seeing the signs ?

some reasonable price drops in Canada. not much moving .... opportunities to purchase the superior Euro cars.
Canadian peso .......
...... not that tricky, the importation process, in most cases.

More bump! A lotta mo!!!

Not sure if Vaive and Suga' are the same person but they sure share the same OCD traits ...


Japanese Classics Are the Hottest Bet in Car Collecting Right Now

Price Drops Here there and Everywhere...It Has Begun in Earnest



with the "perfect" caps and all in a PPMPF thread of all places.

He forgot to capitalize "there" and "in"
But, solid OCD points yourself for obsessing over caps, LOL.

Also, Vaive is arguing air cooled cars are pricing down.
My stance is that they can only go up up up.

So did you ;)