Air Injection Pump

[gregsy]

Has anyone removed their air injection pump? How easy is it to do, Ive seen the blanking studs at various porsche shops. There doesnt seem to be any info on this proceedure on pelican parts or any of the other sites?

If my memory serves me correct it was in an issue of 911 and Porsche World, but which issue?

Thanks

Greg

 

[bones]

Greg I've done this there is a little more info here
http://forums.pelicanparts.com/search.php?s=&action=showresults&searchid=428025&sortby=lastpost&sortorder=descending
It's not too hard but it's easier without the heat exchangers in situ'. After you have undone the air pump brackets and junked the horsepower sapping piece of junk it's under the car to trace the pump lines which as you might know run longtitudinally with the heat exchangers. It's hard to see from the pic but after applying some heat you have to unbolt them from the engine , (can be tricky) and plug the holes left behind, you can get the plugs here
http://www.type-911.co.uk/ac_performance.htm
for £14.00 or try Bert Gear
http://www.berlyn-services.co.uk/parts.htm

 

[bones]

email me if you need more help

 

[Guest]

I removed all the gubbins from the engine bay, including the big bracket, and blanked off the pipe that runs from inside the engine bay to the cylinders. Same effect without risking breaking pipes in manifold. Works fine. I'll send pictures if you need them.
Worth saving the pump in case you sell the car to someone who's a bit anal about originality - can't see why though as it does nothing and MOT emissions seem unaffected.

 

[RSGulp]

Good advice to keep the pump and belt - but does the whole assembly have to be removed at all?

Surely removing just the belt does the same job without all the hassle. I know there's 'access' issues caused by the pump getting in the way of the distributor and left side spark plugs - but nothing too problematic.

Does removing the pump really noticably increase the horsepower?

I think the issue about originality isn't 'a bit anal' - if I bought a car (Porsche or other make) I would be concerned if there were parts missing (and I mean missing completely). It would make me think "what else isn't here that should be?" and "what other quick fixes have been carried out?".

 

[bones]

If the car is otherwise being kept standard and you plan on selling it on then it makes sense to keep all parts that you remove , but if you are into modifying your Porsche into something unique in the way that I am for your own pleasure (which includes making the engine bay tidy and accessible like the earlier cars) then every bit of saved weight and extra few horses eventually add up to a performance increase. Less weight equals better use of the available horepower. You will be hard pushed to feel the horsepower gain from disconnecting or removing the air pump alone.....but it's a start....beware..lol

 

[gregsy]

Thanks Bones and Jeff,

Thats made the job a whole lot clearer, especially looking at the pictures.

Rich,

As you probably know already, the air pump is a useless piece of kit, I have only Just bought the SC but this was one of the jobs I hoped had been done when looking to purchase the car. So I would say that it also is a positive selling point. It makes working on the engine bay far easier, increases BHP and removes a heavy lump of useless steel.

The Negatives: None. Someone that knows enough about 911 SC engines to know that there is an airpump missing will also be aware that it is a outdated emission con.

Gregsy

 

[gregsy]

But fairplay, for every one person looking for the mod, there is probably someone looking for a pump!!!!

 

[RSGulp]

Gregsy,

I understand completely what you are saying, and if this forum is like many others, I hope other 'silent' readers will read this thread and see both sides of this argument. I personally wouldn't want to see the originality of lots of SCs spoiled because people rush out to remove their pump and sling it hoping for a huge surge in power. Obviously you have given lots of consideration to the removal of your pump and bought the correct car to modify accordingly. I suspect this search for extra power will eventually mean binning heating systems, rear seats, carpets, roof lining, etc. [] Of course, I'm only kidding.

That said, I'd be genuinely interested to hear whether the removal of your pump alone, gives a noticeable increase in horsepower. Rather than as part of a general series of power increasing and weight saving mods.

I'm not yet convinced after talking to various specialists over the years that the slight increase in horsepower and the saving in weight would make much of a difference to the power/weight ratio of a standard SC. For example, I've never had a noticeable decrease in power after filling the car with 70 litres (approx. 70kgs) of fuel. But, I'm sure on a rolling road there would be a slight difference - every little helps I suppose.

Please post any findings on here when you've done the job, as I've never spoken to someone with the chance to do a before/after test so have never heard any 'real life' findings.

If there is an increase in power, then I'll think more about removing mine (rather than just disconecting the belt as I've already done) - although as mentioned on this thread already, because my car has remained completely unmodified I'll stow the pump and gubbins away somewhere safe just in case I need to reinstall it in the future.

Cheers,
Rich Claridge
Team Gulp Racing

 

[gregsy]

I'm of the opinion that cars are to be enjoyed. Originality is only a worry for museums, concours competitors and people worrying about the resale value of their car. For eveyone else what does it matter? It just makes my life easier in the long term changing the spark plugs and dizzy cap with the added bonus of a bit more bhp

 

[bones]

To Rich' , I can tell you from experience and you will know from removing the air pump belt that it makes no 'real world' difference to the performance of the car at all, unless you continue suffering from the lightening 'disease', like I do for instance!
and Gregsy I totally agree with you about doing what you like with your car, you do see some weird creations from body shops but overall there are enough people out there with straight cars to satisfy the purists. Let's face it if 911s weren't so easily modifiable they wouldn't be the car they are and there wouldn't be half so many still on the road.