Resurfaceing the Porsche 911 Cylinder Head

Watch as John Edwards @ Costa Mesa R&D Automotive Maachine as he machines an air cooled 911 cylinder head.
www.engine-machining.com
949-631-6376

Category:

Autos & Vehicles

Tags:

• porsche
• 911
• 356
• 906
• 904
• 917
• engine
• machining
• rebuilding
• air
• cooled
• autocross
• vara

[VideoByPatrick]

Does the cam chains take up the slack caused by the machine work to the heads ?

Patrick

1996 C4S

[fiatnutz]

Yes, we only take about .004" to .010" off the heads.

[ezcondition]

where can i get that book??

[fiatnutz]

The books are out of print, but I do have them on CD-ROM.

[PA28140]

Does this cause the Compression ratio to go up since the piston will now be farther up in the head at TDC?

[fiatnutz]

Just slightly. As a rule of thumb, for every .010: you remove from the head, the compression ratio goes up by .1 point.

[TruthBeyond]

I never knew cylinder heads came off individually.

[rednoseroxy]

Now I'm curious.. wouldnt that change the compression ratio for that cylinder?

[jacklav1]

This brings the valves closer to clashing with the piston. Is that an issue or are you miles away?

[rlopez0]

i have 911 3.0 porsche engine. who do you suggest rebuilding the engine and weber's.

[pantherxx010]

wow 5 mroe to go!? Dang that's a lot of work.

[chuckbear1961]

Interesting I never seen a 911 head until now , shure reminds me of the heads on the newer Kohler,Briggs & Stratton OHV lawn mower engines that I service every day.

I never seen that trouble since the gasket area is larger. I know on the VW air cooled engines that very small gasket surface causes problems on those engines.

Only engine like that I`v seen sucessful in long service is the type with BMEP less than 100 psi

[tritop]

Vorher Ausrichten mit Uhr um nicht zuviel "Schlag" wegdrehen zu müssen

[762lenny]

@rednoseroxy yes it does - that job is really just useless to make money