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Airbox... again!

G

guymarshall@techronics.co.uk

New member
Hi all,

We recently bought a '78 SC and following recommendations I have bought an airbox popoff valve. I have been exploring how best to fit it and I notice the central airbox self tapper screw is not flush, but is resting about 2mm proud. I realise this indicates a blown airbox but the car runs fine. How can I test the airbox?
TnZ1LIC.jpg

I guess the plan is to fit the popoff valve with the airbox in the car - can anyone confirm its ok to drill the hole etc with the airbox in place?

One other thing. There are connectors at both ends of the airbox (for the carbon canister/crankcase ventilation?) which unused and are open to the air. Did the UK cars have a carbon canister and if not can these be blanked off safely?
kCNvkM2.jpg


Thanks!
 
Have a look on impactbumpers.com, they specialise in these cars. The forum is superb and someone is bound to have an air box or know where to get one without paying PAT (Porsche added tax??)
 
If its running ok there is no need to replace the air box. Your car has backfired at some point but has just ripped the self tappers out of the plastic, a slightly larger screw will probably work. Pop off valve can be fitted with the engine in but you will need a 90 degree drill. Air boxes are Porsche only so OPC with a club discount will be your cheapest option,
 
Agree with GeoffB - Impact bumpers is a brilliant resource and great members always willing to help. Rose Passion has an airbox available but expensive...
https://www.rosepassion.com/en/cat/porsche-911-74-89-1982-3-0sc-targa-manual-gearbox-5-speed/M169/engine-and-fuel-feed/inlet-inlet-butterfly-valve-manifold-inlet-casing-inlet-sleeve/B1593/air-cleaner/I1396/housing/P14940

- a second hand advert on the IB site might reap rewards though. If the car is running ok then you don't need to replace it.......

 
Well worth advert on impactbumpers if you need one. One of the guys Jeremy (user name Tripe) often has a stock of parts. If he doesn't have one I'm sure he could find one, great honest guy to deal with.
 
You can fit a pop off valve in situ provided you have a 90Deg drill and hoover out any bits before fitting, I have done 2 this way. If you want to replace the air box, as I had to in the end as my old one was already like yours and had had some repairs by a previous owner to keep it going, you can do this again without dropping the engine out, Porsche told me I would have too but if you drop the engine on the mounts you can just get the old one out and the new in, its a squeeze but can be done. I got my new one some years ago from OPC Hatfield who just happened to have 3 in stock but surplus to requirement so got a good deal on mine at I think just over cost[:D]
 
Lovely Job! An o/s stainless self tapper tightens up perfectly in place of the blown screw and I have put an extra 1/4 turn on the others. That should keep us going while I source a new airbox (and reduce the risk of drawing the alarmingly loose screw into the engine).

The only other point was the two unused and open connections at either end of the airbox which I have blocked.

Thanks again for all the help.
 
There is only one airbox for the 3.0 litres cars now, there were options, hence the holes that need to blocked off in some instances.

Good result, I wouldnt bother changing it if the cars runs fine.
 
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