Z20 Under drive pulley and Air Con removal kit

Z20 Under drive pulley and Air Con removal kit

In stock
can be shipped within 2 - 3 days

Price incl. VAT and UK Delivery

Super lightweight crank pulleys 

With the standard crank pulley weighing in at a hefty 1.7Kg+  , it was obvious it could go on a bit of a diet . 

A MK1 light pulley was introduced and the full batch of 100 is still in use today 
A MK2 super light version of this was then produced shortly after in a limited  run , these were very sought after as they were about as light as they could get without compromising strength 
The MK3 pulley was then produced and again the whole batch is in use without any problems 

As always we strive to improve things as much as we can  , The Mk4 pulley has evolved again to include some new features 

A stone guard back plate has been added to the MK4 pulley to give the cambelt area better protection from foreign objects , 
to combat the additional weight that the backplate would give us  , radial slots were added instead of holes to shed some of the extra weight back off .  The result was an underdrive pulley that included a backplate yet still weighs in at under .5KG    -  on average they weigh 460g which we feel is a good result !

This alone will give a more responsive feel to your engine but it does not end there . 

As this pulley is smaller in size , it turns the alternator slower . This causes the alternator to draw less energy from the engine , allowing you to get more onto the ground . 

Another benefit to these pulleys is that your Air conditioning system can be removed and, owing to the pulley being smaller in diameter, the drive belt clears your oil filter housing. Removing air con not only reduces parasitic losses on the crank, it lightens the car at the front end and allows better airflow through your intercooler and radiator.

The old method of removing air con was to slot the alternator mounting bracket, turning it into a more traditional type of tensioner. This was ok, but we felt a neater solution was worth looking for. The old version short belt is still available here

We now provide this kit with a small tensioner pulley, to replace your standard one, allowing you to retain Vauxhalls original tensioner. Without the grooved pulley the belt just continually slips off when run in reverse, we tried it.

Below is a picture of our protoype kit fitted, this is still in use every day!
photo 2012-11-10194955.jpg
We also provide a nice little plate to blank off the air conditioning ports in the bulkhead, for a nicer finish.

 photo ACBlank_zps09514659.gif



This Kit includes;

Under Drive crank pulley with back plate

 Billet Idler grooved pulley


 4 high tensile mounting bolts ( use of threadlock is still recommended )

 And a neat little blanking plate for the air con ports (with bolt)


As always with all our products , feel free to get in touch if you have any questions 




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Prices incl. VAT and UK Delivery

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