Air pump and pullys

[goldk28611]

A bit of a repeat question but am still confused...:confused:

I have some pullys that I\'m going to install and have a new belt also that came with them....

what would you suggestions be to do also? remove air pump, throw away and block holes?  or

What did you do when ya installed yours?

Thanks :wiggle

[Kevin]

Have you still got a cat on your car?

More than likely the new pulley belt will require the removal of the airpump.  If you\'ve de-catted then go for it, you can get blanking plates from some of the above vendors for about £25 when you remove the airpump.

I had a greddy down pipe installed on mine, with greddy pulley\'s, so I removed the airpump and used supernow blanking plates.

I noticed a little bit more response from the engine and it dropped the temp inside the engine bay a fair bit too.

[Kevin]

http://www.mazdarotaryparts.com/bfd-e002-mrp-exclusive---blanking-plate-kitb-741-p.asp

[goldk28611]

No i\'ve still got one...

are you suggesting to keep it in if i still have a cat in then?

or another way of putting it - if i leave it in place with the pullys fitted will that be a problem? as then i can then remove pump when I get the blanking plates at end of month....

[marco]

honestly it depends. 99% of pulley kits i have seen are for removing the air pump, whilst providing enough friction to keep the water pump moving. most also reduce the water pump speed- helps prevent cavitation on engines which are spending long periods at high revs. however as this reduces the normal operating speed of the pump for most engines it is actually a bad thing, it is only of benefit to engines suffering from cavitation. there may be a few that allow the inclusion of the air pump, i am not sure as i have never looked that seriously into them. whether or not you can fit the pulleys with the airpump remaining is all dependent on the length of the belt. however if the belt fits with the air pump on, it isnt going to with the pump off and so you would still have to change belts.  you can remove the airpump without installing blanking plates ( i did so whilst i was waiting for the plates to arrive) so long as you have the right sized belt! however as you still have a cat it is highly recommended that you keep the airpump. its function is to blow air into the exhaust at a couple of points which allows the cat to come upto temperature quickly and keep it from clogging up. you COULD remove the air pump whilst keeping the cat, but it is likely it will fail pretty quick. so in effect once you isolate/ remove the airpump you are going to be looking at removing the cat and getting a decat/midpipe pretty soon. depending on the set up of the car you may need a slight re tune as removing the cat reduces the back pressure on the turbos and so they spool up better. oh and having an air pump fitted means passing mot emissions is easy...

[Fish]

You really need to have the air pump running if you have a cat installed. Otherwise it will just clog up, and you\'ll lose power.

Fish

[DR SCHNITZEL]

as far as blanking plates go can you just plug the hose that the pump leaves behind with say a cork for example, i have just done this to mine and it is idling very erratically now.

[DR SCHNITZEL]

I cant see what the difference is between plugging the hole and using blanking plates, any comments

[interloper393]

I cant see what the difference is between plugging the hole and using blanking plates, any comments

cowboy springs to mind :Santa