Welcome to lesson seven in this eight-part series. In this lesson on resurfacing, we show you one of the last steps before the heads are re-assembled. We show a 2-liter head and a 2.7-liter head in this lesson, as they have different sealing surfaces. Resurfacing the Head Gasket Sealing Surface Re-surfacing the head gasket sealing
How to Rebuild a 911 Cylinder Head. Lesson 7, Resurfacing. Read More »
When to replace your valve seats. A valve seat can only be cut so many times before they are too deep into the head. The valve will be in the wrong spot for the valvetrain when the seats have worn out. A 911 cylinder head is made of aluminum. This is a soft metal and
How to Rebuild a 911 Cylinder Head. Lesson 6, Replacing Valve Seats Read More »
The Solex P40-I Spill Tube Carburetor The Solex P40-I is the first carburetor on the Porsche 911. The six-cylinder Porsche 911 was first offered with this carburetor in 1964. The Solex is a factory fit for 1964, 1965, and 1966 model 911s. But in 1967 the Weber IDA carburetor is a factory fit. For many
We show you how to cut the three-angled seat in your cylinder head. The work that you did to the valves in lesson 2 comes into play in this lesson. By cutting the valve seat, we will match the valve face and create a good seal between the two. A good seal is essential for
How to Rebuild a 911 Cylinder Head. Lesson 5, Cutting Valve Seats Read More »
911 Valve Guides The valve guides in the Porsche 911 Cylinder heads are consumable. The guides will also experience a lot of wear. There is constant friction between the guide and valve stem and the valve-train geometry puts even more side pressure on the guide. Porsche has always used a bronze guide. The bronze has
How to Rebuild a 911 Cylinder Head. Lesson 4, Valve Guides Read More »
Air-Cooled 911 Valve Spring Valve springs control the valvetrain. It is valve spring pressure that forces the valves to stay in contact with the rocker arm. Without the proper spring pressure, the valvetrain becomes uncontrollable. Not enough pressure and you can get valve float when the valvetrain gear loses contact with the camshaft lobe. Too
How to Rebuild a 911 Cylinder Head. Lesson 3, Valve Springs Read More »
Intake and Exhaust Valves This is Lesson Two from an Eight part series. In Lesson One, we covered the cleaning and disassembly of the cylinder head. In this lesson, we are all about the intake and exhaust valves. When the valves first come out of the heads they are very crusty. There can be a
How to rebuild a 911 Cylinder Head. Lesson 2, Intake and Exhaust Valves Read More »
When it comes to the Porsche 911 cylinder head you will rarely find a set that has been untouched. Follow along with this 8 part series to fully understand the air-cooled 911 cylinder head.
Why do you need to Calculate Engine Compression? Any time that you make a change to an engine by machining the crankcase or machining the cylinder heads you change the compression relationships. If you change the relationship, you need to calculate engine compression. Today with the limited availability of original pistons and cylinders the use
Flat rate hours are used to estimate the cost of making a repair to a vehicle. This method has been around since the 1920’s and is used by both independent shops and dealers alike. Recently in the last few years there have been a lot of criticism by both shops and consumers about the use
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