The quick answer
The Type 1 is the classic VW Beetle engine — also found in Karmann Ghias, Splitscreen and early Bay buses, trikes, buggies and kit cars. The Type 4 is the later, larger engine fitted to late Bay Window buses, the VW 411/412 and the Porsche 914. The Water-Boxer (WBX) is the water-cooled evolution used in the T25 / Vanagon.
Side by side
| Type 1 | Type 4 / WBX | |
|---|---|---|
| Found in | Beetle, Karmann Ghia, Split & early Bay bus, trikes, buggies, kit cars | Late Bay Window bus, VW 411/412, Porsche 914; WBX in T25 / Vanagon |
| Typical sizes | 1200cc–1600cc stock; we build up to 2332cc | 1.7–2.0 stock; larger stroker builds available |
| Character | Light, simple, huge tuning support | More torque from the factory, stronger design for heavier vehicles |
| Cooling | Air-cooled | Type 4 air-cooled; WBX water-cooled |
Which should you choose?
- Restoring a Beetle, Ghia or early bus? A Type 1 keeps everything correct and simple — from a stock-spec 1600 to a hot street engine.
- Building a performance Beetle or trike? A big-cc Type 1 (1776–2332cc) is the well-trodden path, with carbs, injection or turbo options.
- Powering a late Bay or a 914? You need the Type 4 — it bolts in and has the torque these heavier vehicles want.
- T25 / Vanagon? That's Water-Boxer territory — we build WBX long blocks too.
- Want more power in a bus without the Type 4? A Subaru conversion is worth a look — modern power, reliability and fuel economy.
Whichever you choose, built the same way
Every engine we build — Type 1, Type 4 or WBX — is blueprinted with bearing clearances, piston & ring measurements, end play and little ends checked and set, a dynamically balanced rotating assembly, a 30-minute hot run, and a minimum 12-month unlimited-mileage warranty. No guesswork, just built right.
Ready to choose your engine?
Browse the ranges, check the price list, or tell us about your car and we'll recommend the right spec.