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Racing cars taking a corner together

Precision for the Passion Precision engine workshop

Engine rebuilding, tuning
and precision machining

Precision engine workshop in the Yvelines, for historic cars, motorsport and engines with character. From the first measurement to the assembled engine, one workshop follows your engine.

Saint-Germain-de-la-Grange · Yvelines Open to visitors on Tuesday & Friday mornings · Other times by appointment

— 01

Passion as the starting point

The engines and cars we care about are rarely ordinary. They have a history, a personality, and often a particular reason to exist.

At Waynholl, that passion drives us to give every detail the same attention we would demand for our own engines.

So every project begins with a precise understanding of the need, the objectives and the constraints of whoever entrusts it to us.

Understand the mechanics. Respect the machine. Attend to every detail.

Securing the bonnet of a blue prototype at Le Mans Classic Le Mans Classic — final checks before the session

i

Understand the mechanics

The engine’s condition, history and use guide the technical choices.

ii

Respect the machine

Preserve its character, keep what can be kept and replace what needs replacing.

iii

Attend to every detail

The standard we hold for our own engines, applied without exception.

— 02

Understand, to answer better

A mechanical project is not a list of operations. It answers a use, objectives and constraints that belong to it alone.

Our role is first to understand those needs, then define a technical answer that fits — seeking the best balance between quality, cost and lead time.

Our expertise then lets us step in at the level the project actually calls for: from a complete engine rebuild through to a single machining operation.

Not simply deliver. Understand, propose, then deliver.

The balance we look for Defined with you, before any work begins

Quality

Dimensions measured and recorded to document the values that matter.

Cost

The right level of intervention for the project — no more, and never less.

Lead time

A schedule agreed at the outset, with transparency whenever it needs to change.

— 03

Your engine taken on end to end

Measuring, machining, grinding, balancing and assembly — every operation on your engine carried out in one workshop.

01Measurement 02Machining 03Grinding 04Metrology 05Assembly
01 Technical workshop

Machining, grinding, balancing and welding — the workshop's own machines, and a written record at each pass.

Workshop

Machines, light and swarf. A few frames from the workshop in Saint-Germain-de-la-Grange.

Removed gearbox gears and shaftsGearbox gears
Piston being machined on a milling machinePiston machining
Pistons and rods lined up on the bench before assemblyPistons & rods
Injection test bench measuring cylindersInjection bench
Cylinder head being prepared in the workshopCylinder head in preparation
Blue prototype with its bonnet open and engine accessible in the paddockTrackside support

Projects made to measure

Particular attention to detail, to meet the specific needs of each project — whether it comes from a private owner or a professional.

Peugeot 504 Coupé XN2 engine being assembled 2.0 L XN2 fuel-injected engine — Peugeot 504 Coupé

Complete rebuild

The engine arrived seized, a valve stuck in its guide after years standing still. The owner wanted to use it for long journeys, so we chose a full top- and bottom-end restoration with electronic ignition fitted. Private owner · Road use
Cylinder head fitted with new guides and seats Naturally aspirated and turbo engines — Porsche heads

Valve guides and seats replaced

Full head overhaul after identifying the worn parts to replace. Some seats could be kept where wear had not gone too deep. The heads were assembled with a new set of guides and new valves. Professional · Head overhaul
Renault 8 Gordini cylinder head after guide replacement R8 Gordini head — René Bonnet Djet coupé

Casting crack welded, guides and seats replaced

This head was new, yet carried a casting crack. We closed it by welding, then fitted the head with its valve guides and seats. Repair · Rare part saved

Precision for the Passion · Passion for Performance

Your project starts here

An engine to rebuild, a part to machine, a preparation project or a technical problem to solve? Tell us about it.

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