#RebuiltNotRepaired

[lnengineering]

What You Need to Know Before Replacing or Rebuilding Your Porsche Engine

So you've just received the bad news: your Porsche engine needs to be rebuilt—or worse, replaced. Whether you drive a Boxster, Cayman, or 911, this is a major moment in your Porsche ownership journey. Before making a quick decision, it’s important to understand your options and the potential risks of each path forward.

Option 1: Buying a Used Porsche Engine

A used engine might seem like the most cost-effective solution at first glance. But there’s more to consider than just the sticker price.

Here’s what you must do before purchasing a used engine:

Get a video of the engine running

Request leak-down and compression test numbers

Inspect the sump and oil filter for debris

Check for signs of bore scoring, especially on engines known to suffer from it

If possible, sending an oil sample for lab analysis is ideal. But when that’s not feasible, a detailed inspection of internal components can provide valuable insights.

Also, beware of “sweep the floor” engines—these are Frankenstein motors cobbled together from failed parts, with no consistent service history or traceable origin. If a used engine looks too clean, it might not be a good thing. Genuine used engines should have consistent grime and wear patterns. If it looks like it’s been taken apart, it probably has.

And while some used engines may come with a new IMS bearing installed, this can sometimes be a red flag. It may indicate a past IMS bearing failure that was only partially addressed. Always ask questions.

Option 2: Buying a Rebuilt Porsche Engine

“Rebuilt” sounds reassuring—but not all rebuilds are created equal. The term “rebuilt” has no strict industry standard, so sellers can use it loosely. At minimum, a proper rebuild should include:

Complete engine disassembly

Inspection and measurement of all components

Replacement of worn or damaged parts

Cleaning and reassembly with proper specifications

Unfortunately, many so-called “rebuilt” engines are really just repaired—only the broken parts were replaced, and often without correcting root causes or addressing underlying wear.

The Right Choice: Partner with a Porsche Specialist

Regardless of which route you choose—used or rebuilt—your best bet is to consult with a Porsche engine specialist who can guide you through the pros and cons of each option.

At LN Engineering, we work with trusted rebuilders and certified installers to ensure your engine is built to the highest standards. If your Porsche engine needs serious work, make sure your investment pays off with long-term performance and peace of mind.

Don’t gamble with your Porsche. Call or visit LNEngineering.com to discuss your engine rebuild or replacement options today.