cam timing

[kepperly]

is it possible to degree in a 911 motor similar to the procedure for a small block v-8.

Thanks
keith epperly
87 slant nose turbo look carrera cabriolet

[Eagledriver]

The cam timing in a 911 engine is infinitely adjustable. You can set the timing wherever you think will work best. I don't know the procedure for a small block V-8 though.

-Andy

[Jeff Alton]

Yes, it could be done. But you would need to know the specs from for the particular grind of can you have converted to degrees. Timing a 911 cam (using lift at TDC) is actually pretty easy to do....

Cheers

[2.7RACER]

Keith,
Sure, actually using a dial indicator is derived from first using a degree wheel.
Keep in mind Porsche specs use 1.0 mm (0.040") valve opening, where as American cam makers use .050" valve opening for the quoted cam specs.
Web cam quotes .050" and from zero.
It sometimes seems as if they are trying to shroud the real specs with mystery numbers.
Actually it is simply because European's work with the metric system and Americans worked in inches.

[911pcars]

Originally posted by kepperly
is it possible to degree in a 911 motor similar to the procedure for a small block v-8.

Typically, there's only one cam timing setting on a small block V-8 unless you use an aftermarket cam gear. There are also offset woodruff keys to advance or retard the cam timing. The method Porsche uses is vastly superior to what is available on most engines.

In regards to setting cam timing with a degree wheel, yes it's possible. However, you'd need accurate valve opening specs from the factory and/or from the cam supplier. Not sure I've read whether the factory's TDC overlap measurement method provides the same cam timing compared to timing settings derived from a degree wheel. Good question.

Sherwood

[kepperly]

I RECALL YEARS AGO WHEN I WORKED AT NORMAN SCOTT MERCEDES, PORSCHE , AUDI IN HOUSTON THAT THE BEST TECH -
TERRY CURRY USED TO DEGREE THE CAMS IN FOR SOME SPECIAL
CUSTOMERS AND IT DID MAKE A PRONOUNCED DIFFERANCE
IN THE WAY THEY RAN.

KEITH EPPERLY
87 SLANT NOSE TURBO LOOK CARRERA CABRIOLET

[marlinaness]

This sounds similar to what was done for a full rebuild on a 2.2T in Germany by Krueger. I think he explained (in German) that he retarded the cams because the S cams would hit the E pistons. It had outstanding power and I got over 60K miles running on the Autobahns with no problems (before I sold it, retired, and returned to the US.)

[john walker's workshop]

6 of one, 1/2 dozen of the other. there's various ways to skin the cat. end result is the same.

[camgrinder]

Originally posted by 2.7RACER
Keith,
Sure, actually using a dial indicator is derived from first using a degree wheel.
Keep in mind Porsche specs use 1.0 mm (0.040") valve opening, where as American cam makers use .050" valve opening for the quoted cam specs.
Web cam quotes .050" and from zero.
It sometimes seems as if they are trying to shroud the real specs with mystery numbers.
Actually it is simply because European's work with the metric system and Americans worked in inches.

This is why I have both .040" and .050" numbers listed on my website.
If you need opening and closing numbers to degree the cams in with a degree wheel, I can provide them.