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Lightweight Alloy Bottom Pulleys - Z20LEx

Alloy Bottom Pulleys for Z20LEx Engines

Lightweight Alloy Bottom Pulley
Note: Library Example Image
Lightweight Billet Alloy Bottom Pulley Standard Size - Z20LEx engine.

The standard bottom pulley is constructed around a rubber centre donut which is bonded to a steel centre section. Over time the rubber can split, which causes the pulley to wobble. This can throw the drive belt particularly on engines that are operating at high RPM.

Our alloy pulley cures this problem and is machined from solid billet alloy. Machined from 6082 T6 billet alloy, better balanced and 1 kilo lighter than the standard OE item. Multi V, 4 Bolt fixing.
Available as an OE Standard size and Underdrive (smaller) pulley.
The above image shows a direct replacement OE size pulley. This type of pulley is lighter than the factory item by around 1 kg but remains the same size as the factory pulley.
Underdrive Lightweight Billet Alloy Bottom Pulley with rear flange - Z20LEx engine.
Ideal for Aircon Deletion......

We also offer an underdrive alloy bottom pulley which is a smaller diameter pulley than the original size used from the factory. This can be used either with the factory aircon set up still in place (with a shorter drive belt) or it can be used for when aircon is being deleted and the aircon compressor is removed. The underdrive smaller pulley allows the drive belt (alternator/multi v belt) to clear the oil cooler banjo fittings when a direct belt is used from the bottom pulley directly to the alternator. If a standard sized pulley is used the belt will interfere with the oil cooler banjo bolts, which could damage the belt of worse.
Small Pulley Gap Z20LEx
Image shows gap into cambelt area if an underdrive pulley is used that does not have the cambelt protection flange.
We have produced this underdrive pulley, specifically for front wheel drive cars, with a rear flange (for cambelt protection) which is the same size as the factory pulley, yet the actual pulley itself is smaller (underdrive). The reason behind this is to keep the small triangular area highlighted red in the image above right covered up. Simply fitting a smaller pulley leaves this area exposed which could potentially lead to debris or stone ingress into the cambelt area, potentially causing total engine failure if it were to cause the cambelt to jump a tooth.

So for front wheel drive cars, when fitting an underdrive pulley, we always recomment a pulley with the rear flange for cambelt protection.

Underdrive Lightweight Billet Alloy Bottom Pulley without rear flange
On rear wheel drive VX220 due to the fact these cars have undertrays fitted, there is less likelihood of debris ingress into the cambelt are, so often an underdrive pulley without the protection flange is used. We would however recommend always using a pulley with the cambelt protection.

Lightweight Alloy Bottom Pulley options for Z20LEx engines shown below. Our pulleys are supplied with new allen head retaining bolts and shakeproof washers.
Underdrive Pulley (No Rear Flange) £97.50 Buy Now Click Here! Underdrive with Rear Flange AirCon Delete £113.45 Buy Now Click Here!
Underdrive with Rear Flange AirCon £113.45 Buy Now Click Here! OE Size Alloy Pulley £107.25 Buy Now Click Here!

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