Contact us

Owlesbury Crankshaft Service
Unit 12 Winnall Valley Road
SO23 0LD

Telephone : 01962 855969
Fax : 01962 856969

Email :


Based in Winchester, Hampshire - our reputation for service and unrivalled expertise, has been built over a period of 21 years and is a reputation of which we are truly proud. Our diverse range of customers include ‘track day’, ‘fast road’ car enthusiasts, motorcyclists and superbike teams all the way through vintage and classic, club racers, British Superbike, Motor GP, World Rally Championship, Top Fuel Drag racers, LeMans, Touring Car, Formulas 1, 2, and 3. But we’re not only motorsport engineers, we help commercial fleets and farmers stay operational with general engineering repairs, so no matter what your vehicle type, OCS can repair, restore and recondition your engine components.

Only the highest quality raw materials, the latest methods and the knowledge of our superbly skilled engineers goes into the work we do at OCS. Constantly experimenting on behalf of our ultra-performance-oriented customers has led to the development of several techniques and innovations that raise the level of extreme performance. This combined with our truly unique range of in-house equipment means we are unrivalled in terms of capabilities.

Whilst a great deal of our customers come from the Hampshire area including Southampton, Eastleigh, Basingstoke, Winchester, Portsmouth and the New Forest we are also able to provide our service to new and existing clients further afield throughout the UK and Europe.

Using our combined years of engineering experience, we carry out machining on cylinder heads, lower block, crankshafts and engine components.

Working closely with customers, our team utilises the latest technologies, equipment and software to produce race quality results for motorsport and non-motorsport customers alike.

Our business has been built on service, and this is evidenced by the quick turnaround times we are able to achieve. Proof of this can be measured through the level of repeat business we attain and our customer testimonials.

We offer a free no obligation quotation service for all work. UK and European delivery service is available.

Driven by a commitment to quality and a dedication to customer care, you will find precision and attention to detail at the core of our business. A reputation strengthened by our Federation of Engine Remanufacturers (FER) accreditation.  

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The main services we offer are:

  • Motorsport engineering
  • Classic car engine restoration
  • Engine restoration
  • Engine reconditioning
  • Cylinder head repairs
  • Boat engines
  • Marine engine repairs
  • Marine engine restoration turning and milling
  • Crankshaft grinding
  • Reboring and lining
  • Surface grinding
  • Crack detecting
  • Helicoiling
  • Pressure testing
  • Conrod repairs
  • Service disk grinding
  • Crankshaft repairs and servicing