Air-Cooled Porsche 911 Bosch CIS Airboxes
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- เผยแพร่เมื่อ 28 ส.ค. 2024
- Porsche 911 DIY Repair Blog: joe-engineer.com/
Brief history on Bosch CIS K-Jetronic Airboxes, their issues, and aftermarket versions.
Additional Notes:
1. This video only covers NA airboxes, not Turbo CIS ones.
2. Similar article on my blog covering CIS airboxes: joe-engineer.c...
3. How I rebuilt my aluminum airbox: joe-engineer.c...
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Hey Joe,
Love your videos.
You should do a video on adding a fuse to the unfused light circuits on the SC. Would save alot of people some hassle. Suprised no one has done this yet. I believe the ash tray light and the ventilation light are a couple of the main ones. Had a friend burn a meter of wiring changing the radio, because he accidentally nudged the ash tray light in the process, which had no fuse.
Heaps of info on pelican parts, but no videos.
Video in progress...
Great video! Though I don’t have my CIS installed in my car anymore, I learned a ton. Thanks for explaining in easy language and logic.
That was brilliant Joe! Thanks for this walk through - you cleared up a lot of questions for me and I am sure many others!!!
excellent thanks
Thanks. This is very useful for me! I am still trying to put my CIS back to the engine.
Thanks for the info and a walkthrough. Have you thought of velocity stacks on rudder intakes?
In the lower half of the box in the inlet of each runner? Never thought of it before but that would be a cool experiment!
@@JoeEngineer Yes exactly. That cavity does not yield itself to best airflow, i think small velocity stack colors would help allot right on those openings to the individual rudders. Looks at AMG 63 ROW airboxes. They have velocity stacks even that far away form the engine to help the airflow.
Great video on the boxes. Really appreciate your onsite. The boxes do have an OEM pressure relief system built in from the factory. It works but old brittle boxes will develop cracks even with this in place. Kurt Donahue of Klassik automotive training explains it well in his CIS rebuild video.
Thanks, that was very interesting and informative, especially your insights about vacuum leaks (here and in other videos). Luckily, my SC already had a pop-off valve installed when I got it. I'd love to see an expose on the 911SC timing chain tensioner issue if you are looking for new topics.
Nice video, very informative. I know it's very tight trying to do any work with those components whilst in the car. I've got to replace the intake runner boots and planning to partially drop the engine by loosening / undoing the engine mounts, leaving the fuel, electrical lines, driveshafts in place. Do you think that would create enough room to remove the airbox?
Yes, I've heard of a partial drop to get a little more access. I would go all the way and drop it completely down to work comfortably around the CIS, especially around behind the airbox. If the boots need attention, it's likely other rubber parts do as well.
@@JoeEngineer Thanks, engine will come out someday. For now I've got to fix a few oil leaks at the top of the engine and replace the intake rubbers as this was the source of the vac leak when doing a smoke test.
Hey Jose, curious if you could give a contact to the shop you had rebuild your crimped air hoses. I’m a SoCal local as well.
Yelp Mesa Hose Costa Mesa
Thanks! I'll try bringing my hoses down there in a few weeks, did you have to cut off the old ones for them? Or can I bring mine with the old crimped lines on so they can reference it when they re-make them?@@JoeEngineer
Take the old ones as is so they can reference lengths and clocking angles.
Thanks. I have both aftermarket versions as well and was going to make a video about them but now I don't ;-) Did you weigh the aluminum version?
9ish pounds