Pump in the engine bay

[Malc458]

My 1983 SC has a belt driven pump(?) in the engine bay. never known what it'd purpose was and i disconnect the belt from it a few years ago. i think the bearing was noisy. i am now considering removing it completely as the car seems to drive no differently without it. anybody what it does and how do i blank off the pipes that come off it.

 

[fxm911]

This is an "emission" pump, was fitted to pass emission test in the USA.

 

[nerosdad]

As mentioned to do with emissions to comply with US regulations (like many cars of the day), often the pump is referred to as "Anti Smog Pump". The pipework will go to the "spider' tubing under the engine which injects recycled exhaust gas into the cylinders... likelihood is they are completely blocked (or could even have been removed). Hope that helps

 

[nerosdad]

Sorry didn't answer the other parts of the question, yes you can remove it (its a heavy old thing), but to do it properly you would remove the spider tubing and injectors, then you can buy plugs for the cylinders to blank the threaded holes. However, those injectors will be tight and be warned they 'could' strip threads removing. Alternatively you could remove the pump and blank the rubber elbow hose (sticking through the tinware under the pump). Hopefully someone will chip in if I've missed anything.

 

[Old and Slow]

It is actually an air pump and has an air intake at the top LH side. As mentioned it helps reduce pollution by adding air in after the exhaust valves to reduce unburnt fuel. I removed mine years ago and it still meets UK emissions levels. There's no need to remove all the pipework, just blank off the elbow.
You might get an extra 2-3 bhp without the pump.
IIRC Mitsubishi also used this approach to emissions management in the'80's.

 

[richardstephens777]

Hi Malc,
I removed my air pump, bracket and the pipework 25 years ago on my SC. I used the emission blank plugs from Type 911:

https://www.design911.com/p/porsche-911-emission-plugs-91121100000/?source=doofinder

As stated the system is designed to combust un-burnt fuel in the exhaust system to improve emissions.
It's very effective on the 930 turbo which generates extra energy for the turbo improving engine torque.
On the SC it has no effect on the engine but will save a bit of horse power by not driving the pump.
Saves a bit of weight as well.
Keep all the parts as they do not make then anymore and they are expensive.
The next person you sell the SC to might want a more concours car so will need to have the air pump on show.
Cheers,
Rich

 

[T911UK]

As all the guys above have said, remove pump and bracket etc, dont try and remove the pipes from the engine, wait until the engine is out and do it then, just blank the pipe off where it goes through the engine tray

We have 2 types of plugs;

https://type911shop.co.uk/epages/de867ca1-377e-432e-84fd-bdccf2206766.sf/en_GB/?ObjectPath=/Shops/de867ca1-377e-432e-84fd-bdccf2206766/Products/8643

and

https://type911shop.co.uk...f2206766/Products/8712

 

[Malc458]

Thanks for that; i think i will do the sipler option and blank off the rubber tube as you say. however do i need to buy a part to blank off this tube?

 

[T911UK]

I just stuffed some paper down it and topped it up with black silicon, looked nice and neat

 

[Malc458]

THanks for that i will give t a try.

 

[Malc458]

Hi. Does anybody know of someone who can replaced my head lining in South or West Wales?