Is this an engine exchange program or do you use my original engine?  

We are Porsche purists at heart and will try to reuse your original block and serial numbers whenever possible.  When it is not possible, we work to source and refurbish core components at a reasonable price to fully restore your engine.  We do occasionally have prebuilt core engines that can be swapped out or sold with a core charge.

Can you reuse my oil fed IMS Bearing?

Preferably not.  The large bearing M97 IMS is the Porsche proven solution for the IMS bearing issue and the only one that we support.  In addition, oil fed bearings rob oil pressure from where it's needed the most, the rod and main bearings, and diverts it to the IMS which is already well lubricated through splash oil.  

Can I customize my build? 

Absolutely.  Our base build package is the minimum amount we feel is necessary to provide a rock solid engine that we can be proud of.  From there, we try to tailor each individual build to best meet our customers goals and objectives.

Can a Slakker/Hartech engine be used on the street?

Yes.  The beauty of the Hartech design is that they are hardened enough for endurance racing yet refined enough to be enjoyably daily driven.  

Is the 4.1L as reliable as the stock displacement engines?

Absolutely.  The British Endurance Championships was won with a Hartech 4.1L.  Because we replace the cylinders (not just bore it out), we are able to maintain cylinder wall thickness on our largest builds.  

If I ship you just the engine, what do you need with it?

We would like the engine, all of the ancillaries, and the ecu for final testing on our engine dyno.  This also gives us the opportunity to clean out any foreign debris from the intakes and hoses that may exist from a failure.  Items that we don't need are the flywheel, airbox, exhaust or engine mount.

Can I use a LWFW on my Slakker/Hartech Engine without voiding the warranty?

We support use of the Aesco LWFW and the stock OEM (Sachs) clutch and pressure plate or the sprung Sachs performance clutch.

Can you perform other services on my car that make sense while the engine is out?

Yes.  Below is a list of services that are frequently asked about and that we will perform for our engine customers only:

• • Center radiator installation
  • Clutch, pressure plate, flywheel, and slave cylinder replacement
  • Numeric shifter installation and numeric or stock cable replacement
  • Exhaust upgrades
  • Brake and fluid upgrades
  • Limited Slip Differentials 
  • Custom tuning
  • Racing dash and sensor installation and setup
  • Suspension upgrades
  • Plenum and throttle body upgrades

Do you support supercharging your engines?

We do support low boost builds of our 4.1L engines up to 600hp on a custom, one off basis.

Can I pick my car up and drive it home?

Yes, but you will be required to pay Oklahoma sales tax of 8.625% on parts purchased.

What type of post sales support do you offer?

If you have an issue or question, please email support@sr.dev and we will generally get back to you the next business day. If it is an emergency, you can reach us at (405) 913-4039.

What oil and change interval do you recommend?

We use Driven BR50 for the break in and testing process.  Following that, we recommend the following for street use: Motul 300V 10W-50 or 15W-50, or Driven DI50.  For track use, please use Motul 300V 10W-60, which can also be used on the street.  Your first oil change should be at 1000-2000 miles.  Change interval moving forward is recommended at 3000-5000 miles depending on the UOA results.  We equate one track hour to equal 500 miles. 

Do I need to limit my driving initially on my engine when I get it back?

No, it can be driven aggressively.  Our process is the same for all of our engines and so they leave our facility "race ready".