Engine / Gearbox Building

Valve Spring Upgrade

Built to Handle Power. Designed for Reliability.

At SL Autowerkes, we specialise in engine / gearbox building for European vehicles, performance applications, and high-stress driving conditions. Whether you’re chasing big numbers on the dyno or preparing for track and race use, we build engines and transmissions with real-world reliability in mind — no shortcuts, no guesswork.

Our engine / gearbox building services are tailored to your platform, power goals, and intended use. From forged internals and sleeved blocks to upgraded clutches and strengthened gearsets, we engineer every build to perform under pressure.

Engine / Gearbox Building Services Include:

  • Complete Engine Rebuilds & Blueprinting

  • Crank Hub Replacement (S55 Only)

  • Forged Pistons, Rods & Crank Upgrades

  • Closed-Deck Conversion & Block Sleeving

  • High-Performance Head Work & Valve Trains

  • Strengthened Gearbox Internals (DSG, ZF, Manual)

  • Clutch & Flywheel Upgrades for High Torque

  • Balancing, Assembly & Break-In Procedures

  • Race & Track-Spec Engine / Gearbox Packages

  • OEM+ Builds for Daily-Driven Reliability

Crank Hub SL
Engine & Gearbox Building

Platforms We Build:

  • BMW (B58, N54, S55, S58, N55)

  • Volkswagen / Audi (EA888, RS3, S3, MQB)

  • Mercedes-AMG (M177, M133, M139)

  • Porsche Turbo / Cayenne / Macan / Panamera

  • Cupra, Skoda, MINI and other many other platforms

From BMW and Audi platforms to high-performance Porsche and Mercedes-AMG builds, we specialise in developing custom solutions tailored to a wide range of vehicles — including Cupra, Skoda, MINI and many more.

To discuss a build for your platform, contact our team today.

What Our Clients Say

 
 
 
 
 
 
 
  
 
 
 
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 Kane Gibbs profile picture 
 
 
 Kane Gibbs 
 
14/03/2025
 
 
 Google star 1Google star 2Google star 3Google star 4Google star 5Trustindex verifies that the original source of the review is Google. 
Brilliant team, super down to earth, super knowledgeable, brilliant pricing. Wouldn’t take my car anywhere else!
  
 
  
 
 
 
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 Daniel Dwarf profile picture 
 
 
 Daniel Dwarf 
 
13/03/2025
 
 
 Google star 1Google star 2Google star 3Google star 4Google star 5Trustindex verifies that the original source of the review is Google. 
Amazing workshop cheap prices and friendly staff definitely recommend
  
 
  
 
 
 
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 Destiny Ruth profile picture 
 
 
 Destiny Ruth 
 
10/03/2025
 
 
 Google star 1Google star 2Google star 3Google star 4Google star 5Trustindex verifies that the original source of the review is Google. 
They found a tiny leak in my radiator that has been causing overheating issues for a while after another shop couldn’t find it. They also diagnosed an oil leak at the same time and repaired both within the day. Matt was able to clearly explain what was wrong and Addison kept me updated the whole time
  
 
  
 
 
 
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 Georgina Leach profile picture 
 
 
 Georgina Leach 
 
16/02/2025
 
 
 Google star 1Google star 2Google star 3Google star 4Google star 5Trustindex verifies that the original source of the review is Google. 
I had an electrical issue on my navara that caused my break lights to stop working and some traction lights to come on.. Matt and Addison were happy to take a look at it straight away being that it’s not safe to not have my break lights. They were patient and explained everything in a way I could understand! Will definitely be coming back for my regular services and other needs.
  
 
  
 
 
 
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 Hayden Turner profile picture 
 
 
 Hayden Turner 
 
12/02/2025
 
 
 Google star 1Google star 2Google star 3Google star 4Google star 5Trustindex verifies that the original source of the review is Google. 
Both Matt and Addison are exceptional at what they do!

Matt has looked after mine and my families cars for years. He’s passionate about his craft and will always go the extra mile for his customers.

You won’t find better service or attention to detail anywhere else!
  
 
  
 
 
 
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 leo cuzman profile picture 
 
 
 leo cuzman 
 
12/02/2025
 
 
 Google star 1Google star 2Google star 3Google star 4Google star 5Trustindex verifies that the original source of the review is Google. 
Matt and the team have always been transparent and easy to work with. A wealth of knowledge and a competitive price. Recommended!
  
 
  
 
 
 
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 Luke Civetta profile picture 
 
 
 Luke Civetta 
 
12/02/2025
 
 
 Google star 1Google star 2Google star 3Google star 4Google star 5Trustindex verifies that the original source of the review is Google. 
Brilliant team that not only fix your vehicle, but actually take the time and care to solve issues. They were professional, patient, and communicated every step of the way. Will be re-visiting and recommending for sure!
  
 
  
 
 
 
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 Nick French profile picture 
 
 
 Nick French 
 
12/02/2025
 
 
 Google star 1Google star 2Google star 3Google star 4Google star 5Trustindex verifies that the original source of the review is Google. 
Addison and Matt were professional and fantastic to deal with at SL autowerks had some diagnostic issues they were happy to jump right on it and get it all sorted for me definitely would recommend for any job big And small 10/10 will use these guys again.
  
 
  
 
 
 
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 Michael Stephenson profile picture 
 
 
 Michael Stephenson 
 
11/02/2025
 
 
 Google star 1Google star 2Google star 3Google star 4Google star 5Trustindex verifies that the original source of the review is Google. 
They were able to get my car sorted the same day it broke down. Knowledgeable, friendly and an over great experience.
  
 
  
 
 
 
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 Christopher Browning profile picture 
 
 
 Christopher Browning 
 
11/02/2025
 
 
 Google star 1Google star 2Google star 3Google star 4Google star 5Trustindex verifies that the original source of the review is Google. 
Need a really good mechanic with European Vehicle repair experience?
Well this is the place!
They are happy to service any type of vehicle and everything that is done, or needs doing, is all explained.
Plus a bonus discount for February.

Contact SL Autowerkes

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Frequently asked questions

It includes full disassembly, inspection, and reassembly with upgraded performance parts — designed to handle more power and stress than stock setups.

If you’re planning a big-power build, track use, or have experienced drivetrain issues at higher power levels, a reinforced setup ensures long-term durability.

Yes. We offer fully forged engine builds with upgraded pistons, rods, bearings, and other internals — ideal for turbo upgrades and Stage 3+ power levels.

Absolutely. We reinforce DSG, ZF, and manual transmissions with upgraded clutches, gearsets, and cooling systems to handle increased torque and aggressive driving.

Yes — all Engine / Gearbox Building is done in-house at SL Autowerkes by technicians with real-world race and tuning experience.

We specialise in European platforms including BMW (B58, N54, S58), Audi, VW (EA888), Mercedes-AMG, Porsche, Cupra, and more.

Definitely. We provide full consultation for Engine / Gearbox Building, helping you choose the right components and setup for your goals — street or track.

Often you’ll want upgraded cooling, fueling, a performance tune, and stronger drivetrain components to support the extra power safely.

Yes, in most cases, it will. But we build for reliability and offer post-build support, including tuning and servicing.

Depending on parts and scope, a full build typically takes 2–4 weeks. We’ll confirm timeframes during your consultation.