Resurfaceing the Porsche 911 Cylinder Head

[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

[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.

[YoungJim409]

Good gig for a CNC lathe; you could write a program to cut both faces the same amount on each pass so it would only be a matter of feeding it another few thousandths until it looks right.

[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.

[rmauler]

That's a pretty sweet jig!

[TruthBeyond]

I never knew cylinder heads came off individually.

[capidecallu]

I think that this head came from an old 911 flat six engine aircooled; the heads came off individually to allow the air to cool between these one. Sorry for my bad english, but i'm italian...

[thegirl44]

ya in volks wagon and porche ,,, both were designed by dr porche ,,, and being air cooled they look more like that from a bike , ,,,

[Behigh2000]

until now :D....porsche :)

[MetallicAsian]

Now that looks amazing

[rednoseroxy]

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

[flyboy333]

Probably not enough to make a difference, but maybe. I assume he's doing that for all of them, but maybe not.

[Drkadrk]

no they stack thicker rings so it evens out

[CRF250RGUY]

He said he has 5 more to do....

[pyro8818ak47]

Yes it would but very slightly but he will more than likely machine all of them as a rule of thumb

[Prozackityzac]

He shaved the first part where the circular gasket goes, then he shave the surface around the circular groove. Which then brings it back to its original dimensions.

[762lenny]

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

[TECHKLEC]

Thanks for posting these informative videos.