Definitive Guide to Building The Early 1.8T Engine For High Horsepower
- MK4 GTI
- MK4 Jetta GLI
- B6 A4
- B5 A4
- MK1 Audi TT
- And many more


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Blocks – there are two styles of 1.8T engine blocks, 058 and 06A.
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058 blocks are found in vehicles produced from the beginning of production until year 2000.5.
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Model years 2000.5 and newer use 06A block.
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Model year 2000 was a split production year so both 06A and 058 blocks are found in that year.
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058 blocks have an internal intermediate shaft that that drives the oil pump and use an external water pump driven by an accessory belt.
- 058 blocks are only found in the early longitudinal Audi B5 A4 and VW B5 Passat.
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06A blocks do not have an intermediate shaft and use a water pump driven by the timing belt. The oil pump is chain driven by the oil pump drive gear located on the snout of the crankshaft.

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06A main bolts - M10x80mm Manufacturers Part Number: N90130001 IE Part Number: OEM-18T-MAIN06A
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058 main bolts - M10x65mm (commonly used in engine codes AEB or ATW) Manufacturers Part Number: N10263801 IE Part Number: OEM-18T-MAIN058
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Thrust bearings (used in all 1.8T engines) Manufacturers Part Numbers: 026198421 / 026105635A IE Part Number: OEM-18T-THRUST

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06A blocks use a slotted style trigger wheel.
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058 blocks use a dented style trigger wheel.

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Most 06A 1.8T engines employ a 19mm wrist pin (225 horsepower models use 20mm).
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058 1.8T engines typically use a 20mm wrist pin.

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All stock 1.8T pistons have a bore size of 81mm.
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Factory published compression ratios tend to vary but from our experience actual compression ratios range from 9.25:1 to 9.3:1.




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Very narrow beam design that leads to bent rods under increased torque.
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Inferior metals (stock rods are usually made from sintered iron) compared to aftermarket forged rods. These weak alloys lead to broken connecting rod beams.
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06A blocks will typically require 144x19mm connecting rods that have a tapered wrist pin (with the exception of 225hp engines). There are many engine codes that accept these rods with stock pistons. (availabe with rifle drilling) IE part numbers: IERHVA2, IERHVA2-RD
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058 blocks or other high-output (225 HP) 1.8T engines will typically require 144x20mm connecting rods to be used stock pistons. Common engine codes that use 20mm wrist pins are AEB, AGU, AMK, AMU, APX, ATC, ATW, AWD, AYP, and BEA. (available with rifle drilling) IE part numbers IERHVA1, IERHVA1-RD


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Flywheel bolts (6)
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Crank damper bolt (1) 06A IE Part Number: OEM-18T-CRANKBOLT06A 058 IE Part Number: OEM-18T-CRANKBOLT058
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Crank damper pulley to timing gear bolts (4)


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H-beam 144x20- Proven strong and reliable IE Part Number: IERHVA1
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H-Beam 144x20 rifle drilled- strong and reliable with added wrist pin longevity from rifle drilling IE Part Number: IERHVA1-RD
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Tuscan I-beam 144x20- our highest quality connecting rod: strong and reliable, superior strength-to-weight ratio, included rifle drilling for wrist pin longevity IE Part Number: IERTVA1

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Mahle pistons- a great option for street builds and daily drivers, quiet piston operation, tight piston-to-wall clearances due to low expansion alloy. Explore pistons
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JE pistons- a great option for street or track use, uses a tough 2618 alloy piston forging, with tons of compression ratios and bore sizes available. Explore pistons
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Wiseco pistons- a great option for street or track use, affordable yet good quality, uses a tough 2618 alloy piston forging. Explore pistons

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IE 06A 4 bolt billet press-fit timing gear IE Part Number: IEBEVA17
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IE 06A/06F 6 bolt billet press-fit timing gear (For customers upgrading to a 6 bolt timing gear and crank damper pulley) IE Part Number: IEBEVC8
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IE/ARP crank bolt (This bolt is also reusable and does not need to be replaced) IE Part Number: ARP-06A-01
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IE dowel pin kit (This kit allows you to drill and ream a hole in the end of the crankshaft, which allows a hardened steel pin to be installed) IE Part Number: IEBEVA6
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IE/ARP crank bolt (This bolt increases clamping force on the timing gear and is reusable) IE Part Number: ARP-058-01

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Mahle Motorsport main bearings IE Part Number: MAH-VM1028
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Mahle Motorsport rod bearings IE Part Number: MAH-VC1027
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Standard OE replacement thrust bearings IE Part Number: OEM-18T-THRUST

- Main Stud Kit (Requires main cap align hone) IE Part Number: ARP-CVA3
- Head Bolt Kit IE Part Numbers: ARP-204-3901 (kit only) ARP-204-3902 (with install tool)
- Head Stud Kit IE Part Numbers: ARP-204-4103 (kit only) ARP-204-4104 (with install tool)
- IE Spec Crank Bolt IE Part Number: ARP-06A-01
- Flywheel bolts IE Part Number: ARP-VWFLYWHEELBOLT
- Main Stud Kit (Requires main cap align hone) IE Part Number: ARP-204-5402
- Head Stud Kit IE Part Numbers: ARP-204-4101 (kit only) ARP-204-4102 (with install tool)
- IE Spec Crank Bolt IE Part Number: ARP-058-01
- Flywheel bolts IE Part Number: ARP-VWFLYWHEELBOLT

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IE 06A/058 1.8T cylinder billet main caps IE Part Number: IEBEVA1


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H-beam 144x20- Proven strong and reliable IE Part Number: IERHVA1
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H-Beam 144x20 rifle drilled- strong and reliable with added wrist pin longevity from rifle drilling IE Part Number: IERHVA1-RD
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Tuscan I-beam 144x20- our highest quality connecting rod: strong and reliable, superior strength-to-weight ratio, included rifle drilling for wrist pin longevity IE Part Number: IERTVA1
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Mahle pistons - standard Mahle shelf pistons unfortunately come with fairly weak wrist pins in most 1.8T applications. At this power level, you should consider using our 1.8T Mahle Stroker custom pistons, which include a very stout wrist pin. Explore pistons
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JE pistons -a great option for street or track use, manufactured from tough 2618 alloy piston forgings. Tons of compression ratios and bore sizes available. Explore pistons
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Any bore, compression ratio, and several crankshaft strokes available.
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Thermal dome coating - reflects heat away from the piston. Commonly used in high HP turbo builds or nitrous applications.
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Anti-friction skirt coating - Commonly used in endurance applications to increase piston skirt longevity.
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Oil-shed coating - used to minimize rotating assembly weight, generally in high RPM naturally aspirated applications.
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Upgraded wrist pins - options range from small and lightweight to stout and strong for turbo high HP turbo builds.
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Lateral gas ports - ensures superior piston ring seal by increasing gas pressure behind the rings. Only recommend for race use as lateral gas ports generally become clogged quickly and wear rings quickly in street applications.

- 2.0T FSI 92.8mm Stroker Crankshaft -This factory forged 2.0 FSI crankshaft is modified with a special IE oil pump drive gear which makes it a drop in 2008cc crankshaft for 06A blocks. IE Part Number: IESKVA6

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4 bolt Fluidampr crankshaft damper IE Part Number: FD-551201 + 4 bolt IE press fit gear IE Part Number: IEBEVA17
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6 bolt Fluidampr crankshaft damper IE Part Number: FD-551211 + 6 bolt IE press fit gear IE Part Number: IEBEVC8

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IE 06A standard main caps & IE girdle kit - Standard main caps are the simpler solution as they use spacers on the top of main caps. The spacers are then machined to form a level oil pan surface that the girdle plate will sit on. IE Part Number: IEBEVA9
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IE 06A tallboy main caps & IE girdle kit - Tallboy main caps, an Integrated Engineering innovation, require complex machining to be installed installed. Instead of using spacers on top of the main caps, the main caps stand proud of the deck and then must be machined flat. In the end they are the better solution as they provide a more stable, and flat, mounting surface for the girdle plate. IE Part Number: IEBEVA13
- IE 058 standard main caps & IE girdle kit - Standard main caps are the simpler solution as they use spacers on the top of main caps. The spacers are then machined to form a level oil pan surface that the girdle plate will sit on. IE Part Number: IEBEVA12
- IE 058 tallboy main caps & IE girdle kit - Tallboy main caps, an Integrated Engineering innovation, require complex machining to be installed installed. Instead of using spacers on top of the main caps, the main caps stand proud of the deck and then must be machined flat. In the end they are the better solution as they provide a more stable, and flat, mounting surface for the girdle plate. IE Part Number: IEBEVA14

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IE 06A 4 bolt billet press-fit timing gear IE Part Number: IEBEVA17
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IE 06A/06F 6 bolt billet press-fit timing gear (For customers upgrading to a 6 bolt timing gear and crank damper pulley) IE Part Number: IEBEVC8
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IE/ARP crank bolt (This bolt is also reusable and does not need to be replaced) IE Part Number: ARP-06A-01
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IE dowel pin kit (This kit allows you to drill and ream a hole in the end of the crankshaft, which allows a hardened steel pin to be installed) IE Part Number: IEBEVA6
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IE/ARP crank bolt (This bolt increases clamping force on the timing gear and is reusable) IE Part Number: ARP-058-01


- Mahle Motorsport main bearings IE Part Number: MAH-VM1028
- Mahle Motorsport rod bearings IE Part Number: MAH-VC102
- Standard OE replacement thrust bearings IE Part Number: OEM-18T-THRUST

- Main Stud Kit (Requires main cap align hone) IE Part Number: ARP-CVA3
- Head Bolt Kit IE Part Numbers: ARP-204-3901 (kit only) ARP-204-3902 (with install tool)
- Head Stud Kit IE Part Numbers: ARP-204-4103 (kit only) ARP-204-4104 (with install tool)
- IE Spec Crank Bolt IE Part Number: ARP-06A-01
- Flywheel bolts IE Part Number: ARP-VWFLYWHEELBOLT
- Main Stud Kit (Requires main cap align hone) IE Part Number: ARP-204-5402
- Head Stud Kit IE Part Numbers: ARP-204-4101 (kit only) ARP-204-4102 (with install tool)
- IE Spec Crank Bolt IE Part Number: ARP-058-01
- Flywheel bolts IE Part Number: ARP-VWFLYWHEELBOLT