Follow along as I build a high performance 914 engine
- Begin tear down
- Long-block to short-block
- Split the case
- Take apart the crank assembly
- Remove the oil pressure relief valve
- Clean up the fan shroud
- Remove secondary oil relief valve
- Replace oil galley plugs
- Clean case halves
- Machine oil pressure sending unit mount
- Measure piston ring gaps
- Dry assembly (TDC & crank end-play measurements)
- Electromotive ignition sensor mounting
- New TDC mark on fan
- Case clearance for connecting rods
- Prepare the camshaft
- Crankshaft assembly and rod clearance
- Rod bearing defects
- New heads arrive!
- Rebuild the alternator for $8
- Modify engine tin
- Setting up to measure valve geometry
- Installing rocker studs
- Measuring pushrod length and valve travel
- Evaluate valve-piston clearance
- Making custom pushrods
- Lapping cylinders to heads
- Modifying windage tray
- Final crank assembly
- Short-block assembly
- Installing pistons in cylinders
- Long-block assembly
- Installing sheet metal
- Distributor drive cover & CHT sensors
- Installing exhaust manifolds
- Modifying Bursch muffler
- Installing transmission
- Rebuilding carburetors
- Fitting velocity stacks
- Building cable throttle linkage
- Making oil pressure
- First start & initial tune
- Preparing for engine installation
- Engine installation
- CHT gauge
- Throttle linkage
- First drive
- On the dyno
New Cylinder Heads
I've received the new heads from Jake Raby's Type IV Store and I'm happy to report that they look very nice. Here are some pictures to show the quality of the work and some of the features that make these special.
The combustion chambers are CNC machined and then double checked to make sure chamber sizes are identical - not only within the same head, but also the two heads combined. The heads are even stamped with the chamber volume and a serial number.
The spark plug locations have been welded up, then re-drilled and re-tapped at an angle to improve combustion. (I believe the angle is the same as the 914 2.0 liter heads.)
The intake ports are CNC machined for accurate port sizing:
And so are the exhaust ports. Of course all of the studs, valves, guides, seats, springs and hardware are new.
