CNC machined and fully anodised aluminium, a simple item but made to a high standard.

Sometimes the OE oil level sensor is not required on the Z20 engine. This little bung slips in place and uses the same clip that you find in the stock bottom end gasket kits.

Comes supplied with orange O ring ready to fit

Aimed at sub ~450-500hp setups, these solid billet aluminium lightweight crank pulleys free up the engine from both inertial weight and parasitic drag from driving the alternator as fast (and A/C if you are retaining that). On setups below the 450hp region we have used these for years with no problems, and you can really feel the benefit on something fairly standard -> 350hpish, as the alternator and A/C add quite a lot of drag which soaks up a good bit of the available power.

The Standard pulley weighs just over 1.7kg, these are just 0.44kg. This allows the enigine to rev more freely, helping with downshift rev matching and general low gear accelleration, essentially a lesser but similar effect to lightening the flywheel.

They are also a smaller diameter than the standard pulley, so drive the alternator more slowly. This helps the alternator to survive at high rpm, and reduces the amount of effort required to drive it, so saving you power to go to the wheels instead. They have been sized to still drive the alternator hard enough at idle to keep the battery charged easily, no increased idle speeds are required. Same goes for the A/C Compressor if you elect to retian that.

We offer a few different packages to suit different setups, as listed below;

Under Drive Pulley Only, no belt

Under drive pulley with Billet Tensioner kit and belt - AKA the Air Con Delete kit - This kit requires you to retain the springy tensioner part of your original air con setup

Under drive pulley with belt for direct drive - Best used with an adjustable alternator bracket

Under drive pulley with belt for retaining A/C

For setups that are aiming beyond 450-500hp, we recommend to use a damped pulley (the standard pulley is not a bad option), as crank shaft harmonics can cause problems without the damping. For that setup we can provide the below kit;

Billet Tensioner kit with belt for Standard Crank Pulley

If you already have an underdrive pulley, then you could buy the tensioner pulley kit on it's own;

Billet Tensioner kit only

Billet Tensioner kit + belt to suit our under drive pulley (if you already have the pulley fitted)

Aimed at sub ~450-500hp setups, these solid billet aluminium lightweight crank pulleys free up the engine from both inertial weight and parasitic drag from driving the alternator as fast (and A/C if you are retaining that). On setups below the 450hp region we have used these for years with no problems, and you can really feel the benefit on something fairly standard -> 350hpish, as the alternator and A/C add quite a lot of drag which soaks up a good bit of the available power.

The Standard pulley weighs just over 1.7kg, these are just 0.44kg. This allows the enigine to rev more freely, helping with downshift rev matching and general low gear accelleration, essentially a lesser but similar effect to lightening the flywheel.

They are also a smaller diameter than the standard pulley, so drive the alternator more slowly. This helps the alternator to survive at high rpm, and reduces the amount of effort required to drive it, so saving you power to go to the wheels instead. They have been sized to still drive the alternator hard enough at idle to keep the battery charged easily, no increased idle speeds are required. Same goes for the A/C Compressor if you elect to retian that.

We offer a few different packages to suit different setups, as listed below;

Under Drive Pulley Only, no belt

Under drive pulley with Billet Tensioner kit and belt - AKA the Air Con Delete kit - This kit requires you to retain the springy tensioner part of your original air con setup

Under drive pulley with belt for direct drive - Best used with an adjustable alternator bracket

Under drive pulley with belt for retaining A/C

For setups that are aiming beyond 450-500hp, we recommend to use a damped pulley (the standard pulley is not a bad option), as crank shaft harmonics can cause problems without the damping. For that setup we can provide the below kit;

Billet Tensioner kit with belt for Standard Crank Pulley

If you already have an underdrive pulley, then you could buy the tensioner pulley kit on it's own;

Billet Tensioner kit only

Billet Tensioner kit + belt to suit our under drive pulley (if you already have the pulley fitted)

Aimed at sub ~450-500hp setups, these solid billet aluminium lightweight crank pulleys free up the engine from both inertial weight and parasitic drag from driving the alternator as fast (and A/C if you are retaining that). On setups below the 450hp region we have used these for years with no problems, and you can really feel the benefit on something fairly standard -> 350hpish, as the alternator and A/C add quite a lot of drag which soaks up a good bit of the available power.

The Standard pulley weighs just over 1.7kg, these are just 0.44kg. This allows the enigine to rev more freely, helping with downshift rev matching and general low gear accelleration, essentially a lesser but similar effect to lightening the flywheel.

They are also a smaller diameter than the standard pulley, so drive the alternator more slowly. This helps the alternator to survive at high rpm, and reduces the amount of effort required to drive it, so saving you power to go to the wheels instead. They have been sized to still drive the alternator hard enough at idle to keep the battery charged easily, no increased idle speeds are required. Same goes for the A/C Compressor if you elect to retian that.

We offer a few different packages to suit different setups, as listed below;

Under Drive Pulley Only, no belt

Under drive pulley with Billet Tensioner kit and belt - AKA the Air Con Delete kit - This kit requires you to retain the springy tensioner part of your original air con setup

Under drive pulley with belt for direct drive - Best used with an adjustable alternator bracket

Under drive pulley with belt for retaining A/C

For setups that are aiming beyond 450-500hp, we recommend to use a damped pulley (the standard pulley is not a bad option), as crank shaft harmonics can cause problems without the damping. For that setup we can provide the below kit;

Billet Tensioner kit with belt for Standard Crank Pulley

If you already have an underdrive pulley, then you could buy the tensioner pulley kit on it's own;

Billet Tensioner kit only

Billet Tensioner kit + belt to suit our under drive pulley (if you already have the pulley fitted)

Z20 Billet Steel Bottom End Girdle Kit

The more you push the power onwards in the z20 , the more problems you start to notice , this is another piece of the puzzle to aid solving a problem of the mains caps moving about and twisting under full load.

Machined from a solid lump of steel , steel is stronger and also very close to the same expansion ratio as the standard block – meaning this girdle does not suffer the same fate as the alloy versions – the mis-match in expansion ratios actually make the mains caps move more !

Machining one from aluminium is a lot less demanding than milling one from steel , its less demanding of the machine and a lot less wear on the tooling too , that still does not mean that its the right way to go. Making the mains caps strong and rigid is the foundation of a lasting bottom end.


This is probably one of the only parts we have actually made that is more heavy than the OE version , we normally like to go the other way and make things lighter where we can. In the case of this girdle , we made sure to carry enough weight in the girdle to really make sure its pretty resilient to twisting and moving

Supplied with a bolt kit to hold the standard windage tray and oil pickup pipe – this girdle kit requires no other non standard parts to be used, no extra machine work and is a direct fit to the z20let (balance delete ) z20leh engine
 

This girdle has all the machine work done then as a last process , is ground flat on the faces that mate to the block.

Upwards of 500HP  , making the bottom end solid is proven foundation for things lasting.
 

Billet Steel Cylinder head hollow dowel pair - 

Replace the junky standard ones for some of these , proven to not crush down and allow the head to move so much 

Wössner Z20 turbo Forged Pistons

Wössner are regarded by Europe’s leading motor sport engine builders as being the piston of choice when building an engine not only to perform, but to withstand the stresses and duress’s of competition life.

Wössner pistons feature a unique Moly coating on the skirts and a grade of 4032 Alloy (T6) which allows the engine builder to run a closer piston to bore tolerance then he might do on another make of piston.

This helps remove the slapping noise during cold start, common place among engines running forged pistons due to larger then OE bore clearances.

The crowns of the pistons are also mirror polished to better resist detonation on a high performance engine. Mirror polishing allows a more even spread of heat inside the chamber which will help prevent “hot spots” on piston crowns. Price includes all piston rings and gudgeon pins.

Spec;

Engine type Z20LET / Z20LEH

OE Bore size 86mm

Bore sizes available 86mm / 86.5mm / 87mm

Engine CC 1998.23cc / 2021.53cc / 2044.97cc

Stroke 86

Wössner Comp. ratio 8.8:1

OE Comp. ratio 8.8:1

Comp. height 30.43

Valve per Cylinder 4

Cylinders 4

Reccomended Piston to Bore clearance 0.08

Available in 86, 86.5 and 87mm diameters.

Wössner Z20 turbo Forged Pistons

Wössner are regarded by Europe’s leading motor sport engine builders as being the piston of choice when building an engine not only to perform, but to withstand the stresses and duress’s of competition life.

Wössner pistons feature a unique Moly coating on the skirts and a grade of 4032 Alloy (T6) which allows the engine builder to run a closer piston to bore tolerance then he might do on another make of piston.

This helps remove the slapping noise during cold start, common place among engines running forged pistons due to larger then OE bore clearances.

The crowns of the pistons are also mirror polished to better resist detonation on a high performance engine. Mirror polishing allows a more even spread of heat inside the chamber which will help prevent “hot spots” on piston crowns. Price includes all piston rings and gudgeon pins.

Spec;

Engine type Z20LET / Z20LEH

OE Bore size 86mm

Bore sizes available 86mm / 86.5mm / 87mm

Engine CC 1998.23cc / 2021.53cc / 2044.97cc

Stroke 86

Wössner Comp. ratio 8.8:1

OE Comp. ratio 8.8:1

Comp. height 30.43

Valve per Cylinder 4

Cylinders 4

Reccomended Piston to Bore clearance 0.08

Available in 86, 86.5 and 87mm diameters.