The C.I.S Porsche engine is great if it is running well. We find a big difference between running and running well. In this lesson, we take a look at an engine we just rebuilt. We left the fuel distributor and the warm-up regulator as is to test them before deciding if they needed a repair.
Lucky for you they both had issues. We work through the process, and with a little more time in the car, we can get this engine bedded in and running well for a long life.
This is a long video, and you may want to watch it a few times to pin down your problems.
The must-have is a pressure gauge. The light is a bonus, but another harder to get must-have is the gas analyzer. Maybe you could take it to a shop with one.
We still have some tuning to do and will grab more footage. As well as the restoration of the C.I.S system lesson. We are editing that one now!
Noid Light
https://amzn.to/3y2ZSUz
Fuel pressure test kit
https://amzn.to/2W1CiL2
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Video is for entertainment purposes, please Porsche responsibly.
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Dear Kurt, first, thank you fro sharing your knowledge with the audience – Porsche enthusiasts. I appreciate that a lot. I have learn about you from the last Mike's video – he is also great. Personally, I have a 3.2 911 with DME fuel injection, but I have very much enjoyed. I would like to hear your opinion on one thing that bother me lately, if you allow. When I accelerate, I hear a whistle in every gear. The whistle comes after, let say, an inch in the throttle and stays for about half an inch farther in, and after that stops. What is your opinion? It would be awesome, if you response. Best regards Lukas
I THINK THIS WILL HELP MY K-JET.
THANK-YOU VERY MUCH. YOU DID A GREAT JOB EXPLAINING WHAT TO DO !!!
I am new to Porsche with a well-worn ‘77 911S. This and your other CIS videos opened the book for me. Excellent instructional videos.
Thank you for this! A lot of great information! Been trying to figure out for a while Now why my 78’ SC 3.0 keeps stalling out when I lift off the throttle! Must be an issue with the deceleration valve @41:55.
Absolutely awesome documentation. Thanks for the great information
Very informative! I did notice however that you have the vacuum and atmosphere hoses reversed on the WUR. For the 1977 production year and the 033 WUR the top hose should run to the top connection on the throttle body (as it does) but via the outer connection of the thermal valve where it couples with the distributor vacuum. And the bottom connection on the WUR should run to the lower connection on the throttle body (where in the video the distributor vacuum hooks up). So basically for the first 30 seconds of startup the thermal valve is now limiting atmosphere to the WUR instead of vacuum. Yet your engine seems to run very well so I'm surprised by this. Would you mind explaining how this can be? Again, great video. I enjoyed watching it! Thanks.
Wish I had seen this before I decided to convert my SC to EFI!
Great video!
An absolute must-watch for any Porsche CIS owner. Very well done and extremely clear.
Q. Replacement injectors – i.e. currently have old 009’s (930). Porsche recommends 017’s as a replacement. Lots of theories out there about fuel volume delivery between the two. I’m more interested in open pressure comparisons done on a bench test to diagnose part of a hot start issue.
Open pressure on the new injectors is 15-20 psi higher compared to a NOS 009 baseline I’m using along w Tech Spec manual for comparison. Porsche recommends 017s for older 3.0 FD and newer 3.3FD 930 cars.
Does the increase in crack open pressure between the older and newer part # indicate better spring strength and therefore better injector sealing after engine shut off or more to do with amount of fuel delivered?