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-   -   Engine camshaft condition opinion (http://forums.pelicanparts.com/911-engine-rebuilding-forum/1174525-engine-camshaft-condition-opinion.html)

Dr J 02-27-2025 03:08 PM

Engine camshaft condition opinion
 
I have a camshaft for an SC with a small pitted area in one lobe. The other camshaft has no pitting. I am looking for suggestions about what to do about it before reinstalling.

Thanks

http://forums.pelicanparts.com/uploa...1740701221.jpg

Jeff Alton 02-27-2025 03:18 PM

Repair/regrind. That is not getting better, only worse.

Contact John at DRCamshafts.com he is a frequent contributor hear and has done our camshaft work for countless years.

Cheers

brighton911 02-28-2025 03:15 AM

Agree with Jeff. Now is the ideal time to have DR regind both cams. Have a close look at your rockers too, the bushing and faces.

Dr J 02-28-2025 06:31 AM

Thank you gentlemen. Will do.

Henry Schmidt 02-28-2025 11:48 AM

Given the need for regrinding, you might think about upgrading to a 964 profile.
This grind will reduce the base circle but the results are certainly withing reason.

porschedude996 03-06-2025 07:04 PM

Quote:

Originally Posted by Henry Schmidt (Post 12420005)
Given the need for regrinding, you might think about upgrading to a 964 profile.
This grind will reduce the base circle but the results are certainly withing reason.

I agree, I’m happy with my 964 regrind in my 3.0, you probably should refinish the rocker arms and check the bushings.

Dr J 03-07-2025 05:20 AM

Based on Henry’s suggestion I did some research on PP about the 964 cam and ppl say you lose some mid range torque and gain hp on top. Is that your experience porschedude996?

Henry Schmidt 03-07-2025 06:52 AM

Quote:

Originally Posted by Dr J (Post 12424104)
Based on Henry’s suggestion I did some research on PP about the 964 cam and ppl say you lose some mid range torque and gain hp on top. Is that your experience porschedude996?

Subtle cam changes can be deceptive.
Given the timing range of most cams in 911 engines, you can advance your cam timing to facilitate lower RPM range.
How much you can advance the cams depends on your piston dome configuration.
Early SCs used .9-1.3 as the range and later SCs used 1.4-1.7.
Later SCs used small intake to also increase low end performance.
Keep in mind that advancing the cams can/will affect dynamic compression.


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